设为首页 - 加入收藏 焦点技术网
热搜:java
当前位置:首页 >

android viewgroup浅析

2014-04-08 11:26:00.0 移动 开发 android viewgroup 浅析  
导读:最近在学习launcher3源码,看到workspace appcustomizepagedview最终都继承自PagedView.java,而PagedView.java又继承自ViewGroup,所以上网查了些资料,看了平台源码。现将一些注释分享一下ViewGroup.java源码:/* * Copyright (C) 2006 The Android Open Source Project ...。。。

最近在学习launcher3源码,看到workspace appcustomizepagedview最终都继承自PagedView.java,而PagedView.java又继承自ViewGroup,所以上网查了些资料,看了平台源码。现将一些注释分享一下


ViewGroup.java源码:

/* * Copyright (C) 2006 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *///ViewGroup是什么?一个ViewGroup是一个可以包含子View的容器,是布局文件和View容器的基类。在这个类里定义了ViewGroup.LayoutParams类,这个类是布局参数的子类。//其实ViewGroup也就是VIew的容器,通过ViewGroup.LayoutParams来指定子View的参数。package android.view;import android.animation.LayoutTransition;import android.content.Context;import android.content.res.Configuration;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Insets;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PointF;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Region;import android.os.Build;import android.os.Parcelable;import android.os.SystemClock;import android.util.AttributeSet;import android.util.Log;import android.util.Pools.SynchronizedPool;import android.util.SparseArray;import android.view.accessibility.AccessibilityEvent;import android.view.accessibility.AccessibilityManager;import android.view.accessibility.AccessibilityNodeInfo;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.view.animation.LayoutAnimationController;import android.view.animation.Transformation;import com.android.internal.R;import com.android.internal.util.Predicate;import java.util.ArrayList;import java.util.Collections;import java.util.HashSet;import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1;/** * 

* A ViewGroup is a special view that can contain other views * (called children.) The view group is the base class for layouts and views * containers. This class also defines the * {@link android.view.ViewGroup.LayoutParams} class which serves as the base * class for layouts parameters. *

* *

* Also see {@link LayoutParams} for layout attributes. *

* *
*

Developer Guides

*

For more information about creating user interface layouts, read the * XML Layouts developer * guide.

* *

Here is a complete implementation of a custom ViewGroup that implements * a simple {@link android.widget.FrameLayout} along with the ability to stack * children in left and right gutters.

* * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java * Complete} * *

If you are implementing XML layout attributes as shown in the example, this is the * corresponding definition for them that would go in res/values/attrs.xml:

* * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} * *

Finally the layout manager can be used in an XML layout like so:

* * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} * * @attr ref android.R.styleable#ViewGroup_clipChildren * @attr ref android.R.styleable#ViewGroup_clipToPadding * @attr ref android.R.styleable#ViewGroup_layoutAnimation * @attr ref android.R.styleable#ViewGroup_animationCache * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren * @attr ref android.R.styleable#ViewGroup_descendantFocusability * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges * @attr ref android.R.styleable#ViewGroup_splitMotionEvents * @attr ref android.R.styleable#ViewGroup_layoutMode */ //ViewGroup作为一个容器,为了制定这个容器应有的标准,所以为其指定了接口public abstract class ViewGroup extends View implements ViewParent, ViewManager { private static final String TAG = "ViewGroup"; private static final boolean DBG = false; /** @hide */ public static boolean DEBUG_DRAW = false; /** * Views which have been hidden or removed which need to be animated on * their way out. * This field should be made private, so it is hidden from the SDK. * {@hide} */ protected ArrayList mDisappearingChildren; /** * Listener used to propagate events indicating when children are added * and/or removed from a view group. * This field should be made private, so it is hidden from the SDK. * {@hide} */ protected OnHierarchyChangeListener mOnHierarchyChangeListener; // The view contained within this ViewGroup that has or contains focus. private View mFocused; /** * A Transformation used when drawing children, to * apply on the child being drawn. */ private Transformation mChildTransformation; /** * Used to track the current invalidation region. */ RectF mInvalidateRegion; /** * A Transformation used to calculate a correct * invalidation area when the application is autoscaled. */ Transformation mInvalidationTransformation; // View currently under an ongoing drag private View mCurrentDragView; // Metadata about the ongoing drag private DragEvent mCurrentDrag; private HashSet mDragNotifiedChildren; // Does this group have a child that can accept the current drag payload? private boolean mChildAcceptsDrag; // Used during drag dispatch private PointF mLocalPoint; // Layout animation private LayoutAnimationController mLayoutAnimationController; private Animation.AnimationListener mAnimationListener; // First touch target in the linked list of touch targets. private TouchTarget mFirstTouchTarget; // For debugging only. You can see these in hierarchyviewer. @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) @ViewDebug.ExportedProperty(category = "events") private long mLastTouchDownTime; @ViewDebug.ExportedProperty(category = "events") private int mLastTouchDownIndex = -1; @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) @ViewDebug.ExportedProperty(category = "events") private float mLastTouchDownX; @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) @ViewDebug.ExportedProperty(category = "events") private float mLastTouchDownY; // First hover target in the linked list of hover targets. // The hover targets are children which have received ACTION_HOVER_ENTER. // They might not have actually handled the hover event, but we will // continue sending hover events to them as long as the pointer remains over // their bounds and the view group does not intercept hover. private HoverTarget mFirstHoverTarget; // True if the view group itself received a hover event. // It might not have actually handled the hover event. private boolean mHoveredSelf; /** * Internal flags. * * This field should be made private, so it is hidden from the SDK. * {@hide} */ @ViewDebug.ExportedProperty(flagMapping = { @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, name = "CLIP_CHILDREN"), @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, name = "CLIP_TO_PADDING"), @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, name = "PADDING_NOT_NULL") }) protected int mGroupFlags; /** * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. */ private int mLayoutMode = LAYOUT_MODE_UNDEFINED; /** * NOTE: If you change the flags below make sure to reflect the changes * the DisplayList class */ // When set, ViewGroup invalidates only the child's rectangle // Set by default static final int FLAG_CLIP_CHILDREN = 0x1; // When set, ViewGroup excludes the padding area from the invalidate rectangle // Set by default private static final int FLAG_CLIP_TO_PADDING = 0x2; // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set static final int FLAG_INVALIDATE_REQUIRED = 0x4; // When set, dispatchDraw() will run the layout animation and unset the flag private static final int FLAG_RUN_ANIMATION = 0x8; // When set, there is either no layout animation on the ViewGroup or the layout // animation is over // Set by default static final int FLAG_ANIMATION_DONE = 0x10; // If set, this ViewGroup has padding; if unset there is no padding and we don't need // to clip it, even if FLAG_CLIP_TO_PADDING is set private static final int FLAG_PADDING_NOT_NULL = 0x20; // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation // Set by default private static final int FLAG_ANIMATION_CACHE = 0x40; // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a // layout animation; this avoid clobbering the hierarchy // Automatically set when the layout animation starts, depending on the animation's // characteristics static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; // When set, the next call to drawChild() will clear mChildTransformation's matrix static final int FLAG_CLEAR_TRANSFORMATION = 0x100; // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes // the children's Bitmap caches if necessary // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; /** * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} * to get the index of the child to draw for that iteration. * * @hide */ protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; /** * When set, this ViewGroup supports static transformations on children; this causes * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be * invoked when a child is drawn. * * Any subclass overriding * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should * set this flags in {@link #mGroupFlags}. * * {@hide} */ protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; // When the previous drawChild() invocation used an alpha value that was lower than // 1.0 and set it in mCachePaint static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; /** * When set, this ViewGroup's drawable states also include those * of its children. */ private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; /** * When set, this ViewGroup tries to always draw its children using their drawing cache. */ static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; /** * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to * draw its children with their drawing cache. */ static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; /** * When set, this group will go through its list of children to notify them of * any drawable state change. */ private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; private static final int FLAG_MASK_FOCUSABILITY = 0x60000; /** * This view will get focus before any of its descendants. */ public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; /** * This view will get focus only if none of its descendants want it. */ public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; /** * This view will block any of its descendants from getting focus, even * if they are focusable. */ public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; /** * Used to map between enum in attrubutes and flag values. */ private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS}; /** * When set, this ViewGroup should not intercept touch events. * {@hide} */ protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; /** * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. */ private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; /** * When set, this ViewGroup will not dispatch onAttachedToWindow calls * to children when adding new views. This is used to prevent multiple * onAttached calls when a ViewGroup adds children in its own onAttached method. */ private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; /** * When true, indicates that a layoutMode has been explicitly set, either with * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. * This distinguishes the situation in which a layout mode was inherited from * one of the ViewGroup's ancestors and cached locally. */ private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; /** * Indicates which types of drawing caches are to be kept in memory. * This field should be made private, so it is hidden from the SDK. * {@hide} */ protected int mPersistentDrawingCache; /** * Used to indicate that no drawing cache should be kept in memory. */ public static final int PERSISTENT_NO_CACHE = 0x0; /** * Used to indicate that the animation drawing cache should be kept in memory. */ public static final int PERSISTENT_ANIMATION_CACHE = 0x1; /** * Used to indicate that the scrolling drawing cache should be kept in memory. */ public static final int PERSISTENT_SCROLLING_CACHE = 0x2; /** * Used to indicate that all drawing caches should be kept in memory. */ public static final int PERSISTENT_ALL_CACHES = 0x3; // Layout Modes private static final int LAYOUT_MODE_UNDEFINED = -1; /** * This constant is a {@link #setLayoutMode(int) layoutMode}. * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, * {@link #getRight() right} and {@link #getBottom() bottom}. */ public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; /** * This constant is a {@link #setLayoutMode(int) layoutMode}. * Optical bounds describe where a widget appears to be. They sit inside the clip * bounds which need to cover a larger area to allow other effects, * such as shadows and glows, to be drawn. */ public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; /** @hide */ public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; /** * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL * are set at the same time. */ protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; // Index of the child's left position in the mLocation array private static final int CHILD_LEFT_INDEX = 0; // Index of the child's top position in the mLocation array private static final int CHILD_TOP_INDEX = 1; // Child views of this ViewGroup //用一个数组来存储这些子View //由于是通过一个数组来存储View数据的,所以对于ViewGroup来说其必须实现增,删,查的算法。 private View[] mChildren; // Number of valid children in the mChildren array, the rest should be null or not // considered as children private int mChildrenCount; // Whether layout calls are currently being suppressed, controlled by calls to // suppressLayout() boolean mSuppressLayout = false; // Whether any layout calls have actually been suppressed while mSuppressLayout // has been true. This tracks whether we need to issue a requestLayout() when // layout is later re-enabled. private boolean mLayoutCalledWhileSuppressed = false; private static final int ARRAY_INITIAL_CAPACITY = 12; private static final int ARRAY_CAPACITY_INCREMENT = 12; private static Paint sDebugPaint; private static float[] sDebugLines; // Used to draw cached views Paint mCachePaint; // Used to animate add/remove changes in layout private LayoutTransition mTransition; // The set of views that are currently being transitioned. This list is used to track views // being removed that should not actually be removed from the parent yet because they are // being animated. private ArrayList mTransitioningViews; // List of children changing visibility. This is used to potentially keep rendering // views during a transition when they otherwise would have become gone/invisible private ArrayList mVisibilityChangingChildren; // Indicates how many of this container's child subtrees contain transient state @ViewDebug.ExportedProperty(category = "layout") private int mChildCountWithTransientState = 0; public ViewGroup(Context context) { super(context); initViewGroup(); } public ViewGroup(Context context, AttributeSet attrs) { super(context, attrs); initViewGroup(); initFromAttributes(context, attrs); } public ViewGroup(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initViewGroup(); initFromAttributes(context, attrs); } private boolean debugDraw() { return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; } private void initViewGroup() { // ViewGroup doesn't draw by default if (!debugDraw()) { setFlags(WILL_NOT_DRAW, DRAW_MASK); } mGroupFlags |= FLAG_CLIP_CHILDREN; mGroupFlags |= FLAG_CLIP_TO_PADDING; mGroupFlags |= FLAG_ANIMATION_DONE; mGroupFlags |= FLAG_ANIMATION_CACHE; mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; } setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); mChildren = new View[ARRAY_INITIAL_CAPACITY]; mChildrenCount = 0; mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; } private void initFromAttributes(Context context, AttributeSet attrs) { TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup); final int N = a.getIndexCount(); for (int i = 0; i < N; i++) { int attr = a.getIndex(i); switch (attr) { case R.styleable.ViewGroup_clipChildren: setClipChildren(a.getBoolean(attr, true)); break; case R.styleable.ViewGroup_clipToPadding: setClipToPadding(a.getBoolean(attr, true)); break; case R.styleable.ViewGroup_animationCache: setAnimationCacheEnabled(a.getBoolean(attr, true)); break; case R.styleable.ViewGroup_persistentDrawingCache: setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); break; case R.styleable.ViewGroup_addStatesFromChildren: setAddStatesFromChildren(a.getBoolean(attr, false)); break; case R.styleable.ViewGroup_alwaysDrawnWithCache: setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); break; case R.styleable.ViewGroup_layoutAnimation: int id = a.getResourceId(attr, -1); if (id > 0) { setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); } break; case R.styleable.ViewGroup_descendantFocusability: setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); break; case R.styleable.ViewGroup_splitMotionEvents: setMotionEventSplittingEnabled(a.getBoolean(attr, false)); break; case R.styleable.ViewGroup_animateLayoutChanges: boolean animateLayoutChanges = a.getBoolean(attr, false); if (animateLayoutChanges) { setLayoutTransition(new LayoutTransition()); } break; case R.styleable.ViewGroup_layoutMode: setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); break; } } a.recycle(); } /** * Gets the descendant focusability of this view group. The descendant * focusability defines the relationship between this view group and its * descendants when looking for a view to take focus in * {@link #requestFocus(int, android.graphics.Rect)}. * * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, * {@link #FOCUS_BLOCK_DESCENDANTS}. */ @ViewDebug.ExportedProperty(category = "focus", mapping = { @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") }) public int getDescendantFocusability() { return mGroupFlags & FLAG_MASK_FOCUSABILITY; } /** * Set the descendant focusability of this view group. This defines the relationship * between this view group and its descendants when looking for a view to * take focus in {@link #requestFocus(int, android.graphics.Rect)}. * * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, * {@link #FOCUS_BLOCK_DESCENDANTS}. */ public void setDescendantFocusability(int focusability) { switch (focusability) { case FOCUS_BEFORE_DESCENDANTS: case FOCUS_AFTER_DESCENDANTS: case FOCUS_BLOCK_DESCENDANTS: break; default: throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); } mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); } /** * {@inheritDoc} */ @Override void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { if (mFocused != null) { mFocused.unFocus(); mFocused = null; } super.handleFocusGainInternal(direction, previouslyFocusedRect); } /** * {@inheritDoc} */ public void requestChildFocus(View child, View focused) { if (DBG) { System.out.println(this + " requestChildFocus()"); } if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { return; } // Unfocus us, if necessary super.unFocus(); // We had a previous notion of who had focus. Clear it. if (mFocused != child) { if (mFocused != null) { mFocused.unFocus(); } mFocused = child; } if (mParent != null) { mParent.requestChildFocus(this, focused); } } /** * {@inheritDoc} */ public void focusableViewAvailable(View v) { if (mParent != null // shortcut: don't report a new focusable view if we block our descendants from // getting focus && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) // shortcut: don't report a new focusable view if we already are focused // (and we don't prefer our descendants) // // note: knowing that mFocused is non-null is not a good enough reason // to break the traversal since in that case we'd actually have to find // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and // an ancestor of v; this will get checked for at ViewAncestor && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { mParent.focusableViewAvailable(v); } } /** * {@inheritDoc} */ public boolean showContextMenuForChild(View originalView) { return mParent != null && mParent.showContextMenuForChild(originalView); } /** * {@inheritDoc} */ public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; } /** * Find the nearest view in the specified direction that wants to take * focus. * * @param focused The view that currently has focus * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and * FOCUS_RIGHT, or 0 for not applicable. */ public View focusSearch(View focused, int direction) { if (isRootNamespace()) { // root namespace means we should consider ourselves the top of the // tree for focus searching; otherwise we could be focus searching // into other tabs. see LocalActivityManager and TabHost for more info return FocusFinder.getInstance().findNextFocus(this, focused, direction); } else if (mParent != null) { return mParent.focusSearch(focused, direction); } return null; } /** * {@inheritDoc} */ public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { return false; } /** * {@inheritDoc} */ @Override public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { ViewParent parent = mParent; if (parent == null) { return false; } final boolean propagate = onRequestSendAccessibilityEvent(child, event); if (!propagate) { return false; } return parent.requestSendAccessibilityEvent(this, event); } /** * Called when a child has requested sending an {@link AccessibilityEvent} and * gives an opportunity to its parent to augment the event. *

* If an {@link android.view.View.AccessibilityDelegate} has been specified via calling * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} * is responsible for handling this call. *

* * @param child The child which requests sending the event. * @param event The event to be sent. * @return True if the event should be sent. * * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) */ public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { if (mAccessibilityDelegate != null) { return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); } else { return onRequestSendAccessibilityEventInternal(child, event); } } /** * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) * * Note: Called from the default {@link View.AccessibilityDelegate}. */ boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { return true; } /** * Called when a child view has changed whether or not it is tracking transient state. */ public void childHasTransientStateChanged(View child, boolean childHasTransientState) { final boolean oldHasTransientState = hasTransientState(); if (childHasTransientState) { mChildCountWithTransientState++; } else { mChildCountWithTransientState--; } final boolean newHasTransientState = hasTransientState(); if (mParent != null && oldHasTransientState != newHasTransientState) { try { mParent.childHasTransientStateChanged(this, newHasTransientState); } catch (AbstractMethodError e) { Log.e(TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); } } } @Override public boolean hasTransientState() { return mChildCountWithTransientState > 0 || super.hasTransientState(); } /** * {@inheritDoc} */ @Override public boolean dispatchUnhandledMove(View focused, int direction) { return mFocused != null && mFocused.dispatchUnhandledMove(focused, direction); } /** * {@inheritDoc} */ public void clearChildFocus(View child) { if (DBG) { System.out.println(this + " clearChildFocus()"); } mFocused = null; if (mParent != null) { mParent.clearChildFocus(this); } } /** * {@inheritDoc} */ @Override public void clearFocus() { if (DBG) { System.out.println(this + " clearFocus()"); } if (mFocused == null) { super.clearFocus(); } else { View focused = mFocused; mFocused = null; focused.clearFocus(); } } /** * {@inheritDoc} */ @Override void unFocus() { if (DBG) { System.out.println(this + " unFocus()"); } if (mFocused == null) { super.unFocus(); } else { mFocused.unFocus(); mFocused = null; } } /** * Returns the focused child of this view, if any. The child may have focus * or contain focus. * * @return the focused child or null. */ public View getFocusedChild() { return mFocused; } /** * Returns true if this view has or contains focus * * @return true if this view has or contains focus */ @Override public boolean hasFocus() { return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; } /* * (non-Javadoc) * * @see android.view.View#findFocus() */ @Override public View findFocus() { if (DBG) { System.out.println("Find focus in " + this + ": flags=" + isFocused() + ", child=" + mFocused); } if (isFocused()) { return this; } if (mFocused != null) { return mFocused.findFocus(); } return null; } /** * {@inheritDoc} */ @Override public boolean hasFocusable() { if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { return false; } if (isFocusable()) { return true; } final int descendantFocusability = getDescendantFocusability(); if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { final View child = children[i]; if (child.hasFocusable()) { return true; } } } return false; } /** * {@inheritDoc} */ @Override public void addFocusables(ArrayList views, int direction, int focusableMode) { final int focusableCount = views.size(); final int descendantFocusability = getDescendantFocusability(); if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { final View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { child.addFocusables(views, direction, focusableMode); } } } // we add ourselves (if focusable) in all cases except for when we are // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is // to avoid the focus search finding layouts when a more precise search // among the focusable children would be more interesting. if (descendantFocusability != FOCUS_AFTER_DESCENDANTS // No focusable descendants || (focusableCount == views.size())) { super.addFocusables(views, direction, focusableMode); } } @Override public void findViewsWithText(ArrayList outViews, CharSequence text, int flags) { super.findViewsWithText(outViews, text, flags); final int childrenCount = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < childrenCount; i++) { View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { child.findViewsWithText(outViews, text, flags); } } } /** @hide */ @Override public View findViewByAccessibilityIdTraversal(int accessibilityId) { View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); if (foundView != null) { return foundView; } final int childrenCount = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < childrenCount; i++) { View child = children[i]; foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); if (foundView != null) { return foundView; } } return null; } /** * {@inheritDoc} */ @Override public void dispatchWindowFocusChanged(boolean hasFocus) { super.dispatchWindowFocusChanged(hasFocus); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchWindowFocusChanged(hasFocus); } } /** * {@inheritDoc} */ @Override public void addTouchables(ArrayList views) { super.addTouchables(views); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { final View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { child.addTouchables(views); } } } /** * @hide */ @Override public void makeOptionalFitsSystemWindows() { super.makeOptionalFitsSystemWindows(); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].makeOptionalFitsSystemWindows(); } } /** * {@inheritDoc} */ @Override public void dispatchDisplayHint(int hint) { super.dispatchDisplayHint(hint); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchDisplayHint(hint); } } /** * Called when a view's visibility has changed. Notify the parent to take any appropriate * action. * * @param child The view whose visibility has changed * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). * @hide */ protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { if (mTransition != null) { if (newVisibility == VISIBLE) { mTransition.showChild(this, child, oldVisibility); } else { mTransition.hideChild(this, child, newVisibility); if (mTransitioningViews != null && mTransitioningViews.contains(child)) { // Only track this on disappearing views - appearing views are already visible // and don't need special handling during drawChild() if (mVisibilityChangingChildren == null) { mVisibilityChangingChildren = new ArrayList(); } mVisibilityChangingChildren.add(child); addDisappearingView(child); } } } // in all cases, for drags if (mCurrentDrag != null) { if (newVisibility == VISIBLE) { notifyChildOfDrag(child); } } } /** * {@inheritDoc} */ @Override protected void dispatchVisibilityChanged(View changedView, int visibility) { super.dispatchVisibilityChanged(changedView, visibility); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchVisibilityChanged(changedView, visibility); } } /** * {@inheritDoc} */ @Override public void dispatchWindowVisibilityChanged(int visibility) { super.dispatchWindowVisibilityChanged(visibility); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchWindowVisibilityChanged(visibility); } } /** * {@inheritDoc} */ @Override public void dispatchConfigurationChanged(Configuration newConfig) { super.dispatchConfigurationChanged(newConfig); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchConfigurationChanged(newConfig); } } /** * {@inheritDoc} */ public void recomputeViewAttributes(View child) { if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { ViewParent parent = mParent; if (parent != null) parent.recomputeViewAttributes(this); } } @Override void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { if ((visibility & VISIBILITY_MASK) == VISIBLE) { super.dispatchCollectViewAttributes(attachInfo, visibility); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { final View child = children[i]; child.dispatchCollectViewAttributes(attachInfo, visibility | (child.mViewFlags&VISIBILITY_MASK)); } } } /** * {@inheritDoc} */ public void bringChildToFront(View child) { int index = indexOfChild(child); if (index >= 0) { removeFromArray(index); addInArray(child, mChildrenCount); child.mParent = this; requestLayout(); invalidate(); } } private PointF getLocalPoint() { if (mLocalPoint == null) mLocalPoint = new PointF(); return mLocalPoint; } /** * {@inheritDoc} */ // TODO: Write real docs @Override public boolean dispatchDragEvent(DragEvent event) { boolean retval = false; final float tx = event.mX; final float ty = event.mY; ViewRootImpl root = getViewRootImpl(); // Dispatch down the view hierarchy final PointF localPoint = getLocalPoint(); switch (event.mAction) { case DragEvent.ACTION_DRAG_STARTED: { // clear state to recalculate which views we drag over mCurrentDragView = null; // Set up our tracking of drag-started notifications mCurrentDrag = DragEvent.obtain(event); if (mDragNotifiedChildren == null) { mDragNotifiedChildren = new HashSet(); } else { mDragNotifiedChildren.clear(); } // Now dispatch down to our children, caching the responses mChildAcceptsDrag = false; final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { final View child = children[i]; child.mPrivateFlags2 &= ~View.DRAG_MASK; if (child.getVisibility() == VISIBLE) { final boolean handled = notifyChildOfDrag(children[i]); if (handled) { mChildAcceptsDrag = true; } } } // Return HANDLED if one of our children can accept the drag if (mChildAcceptsDrag) { retval = true; } } break; case DragEvent.ACTION_DRAG_ENDED: { // Release the bookkeeping now that the drag lifecycle has ended if (mDragNotifiedChildren != null) { for (View child : mDragNotifiedChildren) { // If a child was notified about an ongoing drag, it's told that it's over child.dispatchDragEvent(event); child.mPrivateFlags2 &= ~View.DRAG_MASK; child.refreshDrawableState(); } mDragNotifiedChildren.clear(); if (mCurrentDrag != null) { mCurrentDrag.recycle(); mCurrentDrag = null; } } // We consider drag-ended to have been handled if one of our children // had offered to handle the drag. if (mChildAcceptsDrag) { retval = true; } } break; case DragEvent.ACTION_DRAG_LOCATION: { // Find the [possibly new] drag target final View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); // If we've changed apparent drag target, tell the view root which view // we're over now [for purposes of the eventual drag-recipient-changed // notifications to the framework] and tell the new target that the drag // has entered its bounds. The root will see setDragFocus() calls all // the way down to the final leaf view that is handling the LOCATION event // before reporting the new potential recipient to the framework. if (mCurrentDragView != target) { root.setDragFocus(target); final int action = event.mAction; // If we've dragged off of a child view, send it the EXITED message if (mCurrentDragView != null) { final View view = mCurrentDragView; event.mAction = DragEvent.ACTION_DRAG_EXITED; view.dispatchDragEvent(event); view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; view.refreshDrawableState(); } mCurrentDragView = target; // If we've dragged over a new child view, send it the ENTERED message if (target != null) { event.mAction = DragEvent.ACTION_DRAG_ENTERED; target.dispatchDragEvent(event); target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; target.refreshDrawableState(); } event.mAction = action; // restore the event's original state } // Dispatch the actual drag location notice, localized into its coordinates if (target != null) { event.mX = localPoint.x; event.mY = localPoint.y; retval = target.dispatchDragEvent(event); event.mX = tx; event.mY = ty; } } break; /* Entered / exited dispatch * * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is * that we're about to get the corresponding LOCATION event, which we will use to * determine which of our children is the new target; at that point we will * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. * * DRAG_EXITED *is* dispatched all the way down immediately: once we know the * drag has left this ViewGroup, we know by definition that every contained subview * is also no longer under the drag point. */ case DragEvent.ACTION_DRAG_EXITED: { if (mCurrentDragView != null) { final View view = mCurrentDragView; view.dispatchDragEvent(event); view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; view.refreshDrawableState(); mCurrentDragView = null; } } break; case DragEvent.ACTION_DROP: { if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); if (target != null) { if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); event.mX = localPoint.x; event.mY = localPoint.y; retval = target.dispatchDragEvent(event); event.mX = tx; event.mY = ty; } else { if (ViewDebug.DEBUG_DRAG) { Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); } } } break; } // If none of our children could handle the event, try here if (!retval) { // Call up to the View implementation that dispatches to installed listeners retval = super.dispatchDragEvent(event); } return retval; } // Find the frontmost child view that lies under the given point, and calculate // the position within its own local coordinate system. View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { final int count = mChildrenCount; final View[] children = mChildren; for (int i = count - 1; i >= 0; i--) { final View child = children[i]; if (!child.canAcceptDrag()) { continue; } if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { return child; } } return null; } boolean notifyChildOfDrag(View child) { if (ViewDebug.DEBUG_DRAG) { Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); } boolean canAccept = false; if (! mDragNotifiedChildren.contains(child)) { mDragNotifiedChildren.add(child); canAccept = child.dispatchDragEvent(mCurrentDrag); if (canAccept && !child.canAcceptDrag()) { child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; child.refreshDrawableState(); } } return canAccept; } @Override public void dispatchWindowSystemUiVisiblityChanged(int visible) { super.dispatchWindowSystemUiVisiblityChanged(visible); final int count = mChildrenCount; final View[] children = mChildren; for (int i=0; i = 0; i--) { final int childIndex = customChildOrder ? getChildDrawingOrder(childrenCount, i) : i; final View child = children[childIndex]; if (!canViewReceivePointerEvents(child) || !isTransformedTouchPointInView(x, y, child, null)) { continue; } // Obtain a hover target for this child. Dequeue it from the // old hover target list if the child was previously hovered. HoverTarget hoverTarget = firstOldHoverTarget; final boolean wasHovered; for (HoverTarget predecessor = null; ;) { if (hoverTarget == null) { hoverTarget = HoverTarget.obtain(child); wasHovered = false; break; } if (hoverTarget.child == child) { if (predecessor != null) { predecessor.next = hoverTarget.next; } else { firstOldHoverTarget = hoverTarget.next; } hoverTarget.next = null; wasHovered = true; break; } predecessor = hoverTarget; hoverTarget = hoverTarget.next; } // Enqueue the hover target onto the new hover target list. if (lastHoverTarget != null) { lastHoverTarget.next = hoverTarget; } else { mFirstHoverTarget = hoverTarget; } lastHoverTarget = hoverTarget; // Dispatch the event to the child. if (action == MotionEvent.ACTION_HOVER_ENTER) { if (!wasHovered) { // Send the enter as is. handled |= dispatchTransformedGenericPointerEvent( event, child); // enter } } else if (action == MotionEvent.ACTION_HOVER_MOVE) { if (!wasHovered) { // Synthesize an enter from a move. eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); handled |= dispatchTransformedGenericPointerEvent( eventNoHistory, child); // enter eventNoHistory.setAction(action); handled |= dispatchTransformedGenericPointerEvent( eventNoHistory, child); // move } else { // Send the move as is. handled |= dispatchTransformedGenericPointerEvent(event, child); } } if (handled) { break; } } } } // Send exit events to all previously hovered children that are no longer hovered. while (firstOldHoverTarget != null) { final View child = firstOldHoverTarget.child; // Exit the old hovered child. if (action == MotionEvent.ACTION_HOVER_EXIT) { // Send the exit as is. handled |= dispatchTransformedGenericPointerEvent( event, child); // exit } else { // Synthesize an exit from a move or enter. // Ignore the result because hover focus has moved to a different view. if (action == MotionEvent.ACTION_HOVER_MOVE) { dispatchTransformedGenericPointerEvent( event, child); // move } eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); dispatchTransformedGenericPointerEvent( eventNoHistory, child); // exit eventNoHistory.setAction(action); } final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; firstOldHoverTarget.recycle(); firstOldHoverTarget = nextOldHoverTarget; } // Send events to the view group itself if no children have handled it. boolean newHoveredSelf = !handled; if (newHoveredSelf == mHoveredSelf) { if (newHoveredSelf) { // Send event to the view group as before. handled |= super.dispatchHoverEvent(event); } } else { if (mHoveredSelf) { // Exit the view group. if (action == MotionEvent.ACTION_HOVER_EXIT) { // Send the exit as is. handled |= super.dispatchHoverEvent(event); // exit } else { // Synthesize an exit from a move or enter. // Ignore the result because hover focus is moving to a different view. if (action == MotionEvent.ACTION_HOVER_MOVE) { super.dispatchHoverEvent(event); // move } eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); super.dispatchHoverEvent(eventNoHistory); // exit eventNoHistory.setAction(action); } mHoveredSelf = false; } if (newHoveredSelf) { // Enter the view group. if (action == MotionEvent.ACTION_HOVER_ENTER) { // Send the enter as is. handled |= super.dispatchHoverEvent(event); // enter mHoveredSelf = true; } else if (action == MotionEvent.ACTION_HOVER_MOVE) { // Synthesize an enter from a move. eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); handled |= super.dispatchHoverEvent(eventNoHistory); // enter eventNoHistory.setAction(action); handled |= super.dispatchHoverEvent(eventNoHistory); // move mHoveredSelf = true; } } } // Recycle the copy of the event that we made. if (eventNoHistory != event) { eventNoHistory.recycle(); } // Done. return handled; } private void exitHoverTargets() { if (mHoveredSelf || mFirstHoverTarget != null) { final long now = SystemClock.uptimeMillis(); MotionEvent event = MotionEvent.obtain(now, now, MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); event.setSource(InputDevice.SOURCE_TOUCHSCREEN); dispatchHoverEvent(event); event.recycle(); } } private void cancelHoverTarget(View view) { HoverTarget predecessor = null; HoverTarget target = mFirstHoverTarget; while (target != null) { final HoverTarget next = target.next; if (target.child == view) { if (predecessor == null) { mFirstHoverTarget = next; } else { predecessor.next = next; } target.recycle(); final long now = SystemClock.uptimeMillis(); MotionEvent event = MotionEvent.obtain(now, now, MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); event.setSource(InputDevice.SOURCE_TOUCHSCREEN); view.dispatchHoverEvent(event); event.recycle(); return; } predecessor = target; target = next; } } /** @hide */ @Override protected boolean hasHoveredChild() { return mFirstHoverTarget != null; } @Override public void addChildrenForAccessibility(ArrayList childrenForAccessibility) { ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); try { final int childrenCount = children.getChildCount(); for (int i = 0; i < childrenCount; i++) { View child = children.getChildAt(i); if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { if (child.includeForAccessibility()) { childrenForAccessibility.add(child); } else { child.addChildrenForAccessibility(childrenForAccessibility); } } } } finally { children.recycle(); } } /** * Implement this method to intercept hover events before they are handled * by child views. *

* This method is called before dispatching a hover event to a child of * the view group or to the view group's own {@link #onHoverEvent} to allow * the view group a chance to intercept the hover event. * This method can also be used to watch all pointer motions that occur within * the bounds of the view group even when the pointer is hovering over * a child of the view group rather than over the view group itself. *

* The view group can prevent its children from receiving hover events by * implementing this method and returning true to indicate * that it would like to intercept hover events. The view group must * continuously return true from {@link #onInterceptHoverEvent} * for as long as it wishes to continue intercepting hover events from * its children. *

* Interception preserves the invariant that at most one view can be * hovered at a time by transferring hover focus from the currently hovered * child to the view group or vice-versa as needed. *

* If this method returns true and a child is already hovered, then the * child view will first receive a hover exit event and then the view group * itself will receive a hover enter event in {@link #onHoverEvent}. * Likewise, if this method had previously returned true to intercept hover * events and instead returns false while the pointer is hovering * within the bounds of one of a child, then the view group will first receive a * hover exit event in {@link #onHoverEvent} and then the hovered child will * receive a hover enter event. *

* The default implementation always returns false. *

* * @param event The motion event that describes the hover. * @return True if the view group would like to intercept the hover event * and prevent its children from receiving it. */ public boolean onInterceptHoverEvent(MotionEvent event) { return false; } private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { if (event.getHistorySize() == 0) { return event; } return MotionEvent.obtainNoHistory(event); } /** * {@inheritDoc} */ @Override protected boolean dispatchGenericPointerEvent(MotionEvent event) { // Send the event to the child under the pointer. final int childrenCount = mChildrenCount; if (childrenCount != 0) { final View[] children = mChildren; final float x = event.getX(); final float y = event.getY(); final boolean customOrder = isChildrenDrawingOrderEnabled(); for (int i = childrenCount - 1; i >= 0; i--) { final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; final View child = children[childIndex]; if (!canViewReceivePointerEvents(child) || !isTransformedTouchPointInView(x, y, child, null)) { continue; } if (dispatchTransformedGenericPointerEvent(event, child)) { return true; } } } // No child handled the event. Send it to this view group. return super.dispatchGenericPointerEvent(event); } /** * {@inheritDoc} */ @Override protected boolean dispatchGenericFocusedEvent(MotionEvent event) { // Send the event to the focused child or to this view group if it has focus. if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { return super.dispatchGenericFocusedEvent(event); } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { return mFocused.dispatchGenericMotionEvent(event); } return false; } /** * Dispatches a generic pointer event to a child, taking into account * transformations that apply to the child. * * @param event The event to send. * @param child The view to send the event to. * @return {@code true} if the child handled the event. */ private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { final float offsetX = mScrollX - child.mLeft; final float offsetY = mScrollY - child.mTop; boolean handled; if (!child.hasIdentityMatrix()) { MotionEvent transformedEvent = MotionEvent.obtain(event); transformedEvent.offsetLocation(offsetX, offsetY); transformedEvent.transform(child.getInverseMatrix()); handled = child.dispatchGenericMotionEvent(transformedEvent); transformedEvent.recycle(); } else { event.offsetLocation(offsetX, offsetY); handled = child.dispatchGenericMotionEvent(event); event.offsetLocation(-offsetX, -offsetY); } return handled; } /** * {@inheritDoc} */ @Override public boolean dispatchTouchEvent(MotionEvent ev) { if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onTouchEvent(ev, 1); } boolean handled = false; if (onFilterTouchEventForSecurity(ev)) { final int action = ev.getAction(); final int actionMasked = action & MotionEvent.ACTION_MASK; // Handle an initial down. if (actionMasked == MotionEvent.ACTION_DOWN) { // Throw away all previous state when starting a new touch gesture. // The framework may have dropped the up or cancel event for the previous gesture // due to an app switch, ANR, or some other state change. cancelAndClearTouchTargets(ev); resetTouchState(); } // Check for interception. final boolean intercepted; if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; if (!disallowIntercept) { intercepted = onInterceptTouchEvent(ev); ev.setAction(action); // restore action in case it was changed } else { intercepted = false; } } else { // There are no touch targets and this action is not an initial down // so this view group continues to intercept touches. intercepted = true; } // Check for cancelation. final boolean canceled = resetCancelNextUpFlag(this) || actionMasked == MotionEvent.ACTION_CANCEL; // Update list of touch targets for pointer down, if needed. final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; TouchTarget newTouchTarget = null; boolean alreadyDispatchedToNewTouchTarget = false; if (!canceled && !intercepted) { if (actionMasked == MotionEvent.ACTION_DOWN || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { final int actionIndex = ev.getActionIndex(); // always 0 for down final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) : TouchTarget.ALL_POINTER_IDS; // Clean up earlier touch targets for this pointer id in case they // have become out of sync. removePointersFromTouchTargets(idBitsToAssign); final int childrenCount = mChildrenCount; if (newTouchTarget == null && childrenCount != 0) { final float x = ev.getX(actionIndex); final float y = ev.getY(actionIndex); // Find a child that can receive the event. // Scan children from front to back. final View[] children = mChildren; final boolean customOrder = isChildrenDrawingOrderEnabled(); for (int i = childrenCount - 1; i >= 0; i--) { final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; final View child = children[childIndex]; if (!canViewReceivePointerEvents(child) || !isTransformedTouchPointInView(x, y, child, null)) { continue; } newTouchTarget = getTouchTarget(child); if (newTouchTarget != null) { // Child is already receiving touch within its bounds. // Give it the new pointer in addition to the ones it is handling. newTouchTarget.pointerIdBits |= idBitsToAssign; break; } resetCancelNextUpFlag(child); if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { // Child wants to receive touch within its bounds. mLastTouchDownTime = ev.getDownTime(); mLastTouchDownIndex = childIndex; mLastTouchDownX = ev.getX(); mLastTouchDownY = ev.getY(); newTouchTarget = addTouchTarget(child, idBitsToAssign); alreadyDispatchedToNewTouchTarget = true; break; } } } if (newTouchTarget == null && mFirstTouchTarget != null) { // Did not find a child to receive the event. // Assign the pointer to the least recently added target. newTouchTarget = mFirstTouchTarget; while (newTouchTarget.next != null) { newTouchTarget = newTouchTarget.next; } newTouchTarget.pointerIdBits |= idBitsToAssign; } } } // Dispatch to touch targets. if (mFirstTouchTarget == null) { // No touch targets so treat this as an ordinary view. handled = dispatchTransformedTouchEvent(ev, canceled, null, TouchTarget.ALL_POINTER_IDS); } else { // Dispatch to touch targets, excluding the new touch target if we already // dispatched to it. Cancel touch targets if necessary. TouchTarget predecessor = null; TouchTarget target = mFirstTouchTarget; while (target != null) { final TouchTarget next = target.next; if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { handled = true; } else { final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; if (dispatchTransformedTouchEvent(ev, cancelChild, target.child, target.pointerIdBits)) { handled = true; } if (cancelChild) { if (predecessor == null) { mFirstTouchTarget = next; } else { predecessor.next = next; } target.recycle(); target = next; continue; } } predecessor = target; target = next; } } // Update list of touch targets for pointer up or cancel, if needed. if (canceled || actionMasked == MotionEvent.ACTION_UP || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { resetTouchState(); } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { final int actionIndex = ev.getActionIndex(); final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); removePointersFromTouchTargets(idBitsToRemove); } } if (!handled && mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); } return handled; } /** * Resets all touch state in preparation for a new cycle. */ private void resetTouchState() { clearTouchTargets(); resetCancelNextUpFlag(this); mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; } /** * Resets the cancel next up flag. * Returns true if the flag was previously set. */ private static boolean resetCancelNextUpFlag(View view) { if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; return true; } return false; } /** * Clears all touch targets. */ private void clearTouchTargets() { TouchTarget target = mFirstTouchTarget; if (target != null) { do { TouchTarget next = target.next; target.recycle(); target = next; } while (target != null); mFirstTouchTarget = null; } } /** * Cancels and clears all touch targets. */ private void cancelAndClearTouchTargets(MotionEvent event) { if (mFirstTouchTarget != null) { boolean syntheticEvent = false; if (event == null) { final long now = SystemClock.uptimeMillis(); event = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); event.setSource(InputDevice.SOURCE_TOUCHSCREEN); syntheticEvent = true; } for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { resetCancelNextUpFlag(target.child); dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); } clearTouchTargets(); if (syntheticEvent) { event.recycle(); } } } /** * Gets the touch target for specified child view. * Returns null if not found. */ private TouchTarget getTouchTarget(View child) { for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { if (target.child == child) { return target; } } return null; } /** * Adds a touch target for specified child to the beginning of the list. * Assumes the target child is not already present. */ private TouchTarget addTouchTarget(View child, int pointerIdBits) { TouchTarget target = TouchTarget.obtain(child, pointerIdBits); target.next = mFirstTouchTarget; mFirstTouchTarget = target; return target; } /** * Removes the pointer ids from consideration. */ private void removePointersFromTouchTargets(int pointerIdBits) { TouchTarget predecessor = null; TouchTarget target = mFirstTouchTarget; while (target != null) { final TouchTarget next = target.next; if ((target.pointerIdBits & pointerIdBits) != 0) { target.pointerIdBits &= ~pointerIdBits; if (target.pointerIdBits == 0) { if (predecessor == null) { mFirstTouchTarget = next; } else { predecessor.next = next; } target.recycle(); target = next; continue; } } predecessor = target; target = next; } } private void cancelTouchTarget(View view) { TouchTarget predecessor = null; TouchTarget target = mFirstTouchTarget; while (target != null) { final TouchTarget next = target.next; if (target.child == view) { if (predecessor == null) { mFirstTouchTarget = next; } else { predecessor.next = next; } target.recycle(); final long now = SystemClock.uptimeMillis(); MotionEvent event = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); event.setSource(InputDevice.SOURCE_TOUCHSCREEN); view.dispatchTouchEvent(event); event.recycle(); return; } predecessor = target; target = next; } } /** * Returns true if a child view can receive pointer events. * @hide */ private static boolean canViewReceivePointerEvents(View child) { return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null; } /** * Returns true if a child view contains the specified point when transformed * into its coordinate space. * Child must not be null. * @hide */ protected boolean isTransformedTouchPointInView(float x, float y, View child, PointF outLocalPoint) { float localX = x + mScrollX - child.mLeft; float localY = y + mScrollY - child.mTop; if (! child.hasIdentityMatrix() && mAttachInfo != null) { final float[] localXY = mAttachInfo.mTmpTransformLocation; localXY[0] = localX; localXY[1] = localY; child.getInverseMatrix().mapPoints(localXY); localX = localXY[0]; localY = localXY[1]; } final boolean isInView = child.pointInView(localX, localY); if (isInView && outLocalPoint != null) { outLocalPoint.set(localX, localY); } return isInView; } /** * Transforms a motion event into the coordinate space of a particular child view, * filters out irrelevant pointer ids, and overrides its action if necessary. * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. */ private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, View child, int desiredPointerIdBits) { final boolean handled; // Canceling motions is a special case. We don't need to perform any transformations // or filtering. The important part is the action, not the contents. final int oldAction = event.getAction(); if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { event.setAction(MotionEvent.ACTION_CANCEL); if (child == null) { handled = super.dispatchTouchEvent(event); } else { handled = child.dispatchTouchEvent(event); } event.setAction(oldAction); return handled; } // Calculate the number of pointers to deliver. final int oldPointerIdBits = event.getPointerIdBits(); final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; // If for some reason we ended up in an inconsistent state where it looks like we // might produce a motion event with no pointers in it, then drop the event. if (newPointerIdBits == 0) { return false; } // If the number of pointers is the same and we don't need to perform any fancy // irreversible transformations, then we can reuse the motion event for this // dispatch as long as we are careful to revert any changes we make. // Otherwise we need to make a copy. final MotionEvent transformedEvent; if (newPointerIdBits == oldPointerIdBits) { if (child == null || child.hasIdentityMatrix()) { if (child == null) { handled = super.dispatchTouchEvent(event); } else { final float offsetX = mScrollX - child.mLeft; final float offsetY = mScrollY - child.mTop; event.offsetLocation(offsetX, offsetY); handled = child.dispatchTouchEvent(event); event.offsetLocation(-offsetX, -offsetY); } return handled; } transformedEvent = MotionEvent.obtain(event); } else { transformedEvent = event.split(newPointerIdBits); } // Perform any necessary transformations and dispatch. if (child == null) { handled = super.dispatchTouchEvent(transformedEvent); } else { final float offsetX = mScrollX - child.mLeft; final float offsetY = mScrollY - child.mTop; transformedEvent.offsetLocation(offsetX, offsetY); if (! child.hasIdentityMatrix()) { transformedEvent.transform(child.getInverseMatrix()); } handled = child.dispatchTouchEvent(transformedEvent); } // Done. transformedEvent.recycle(); return handled; } /** * Enable or disable the splitting of MotionEvents to multiple children during touch event * dispatch. This behavior is enabled by default for applications that target an * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. * *

When this option is enabled MotionEvents may be split and dispatched to different child * views depending on where each pointer initially went down. This allows for user interactions * such as scrolling two panes of content independently, chording of buttons, and performing * independent gestures on different pieces of content. * * @param split true to allow MotionEvents to be split and dispatched to multiple * child views. false to only allow one child view to be the target of * any MotionEvent received by this ViewGroup. * @attr ref android.R.styleable#ViewGroup_splitMotionEvents */ public void setMotionEventSplittingEnabled(boolean split) { // TODO Applications really shouldn't change this setting mid-touch event, // but perhaps this should handle that case and send ACTION_CANCELs to any child views // with gestures in progress when this is changed. if (split) { mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; } else { mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; } } /** * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. */ public boolean isMotionEventSplittingEnabled() { return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; } /** * {@inheritDoc} */ public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { // We're already in this state, assume our ancestors are too return; } if (disallowIntercept) { mGroupFlags |= FLAG_DISALLOW_INTERCEPT; } else { mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; } // Pass it up to our parent if (mParent != null) { mParent.requestDisallowInterceptTouchEvent(disallowIntercept); } } /** * Implement this method to intercept all touch screen motion events. This * allows you to watch events as they are dispatched to your children, and * take ownership of the current gesture at any point. * *

Using this function takes some care, as it has a fairly complicated * interaction with {@link View#onTouchEvent(MotionEvent) * View.onTouchEvent(MotionEvent)}, and using it requires implementing * that method as well as this one in the correct way. Events will be * received in the following order: * *

    *
  1. You will receive the down event here. *
  2. The down event will be handled either by a child of this view * group, or given to your own onTouchEvent() method to handle; this means * you should implement onTouchEvent() to return true, so you will * continue to see the rest of the gesture (instead of looking for * a parent view to handle it). Also, by returning true from * onTouchEvent(), you will not receive any following * events in onInterceptTouchEvent() and all touch processing must * happen in onTouchEvent() like normal. *
  3. For as long as you return false from this function, each following * event (up to and including the final up) will be delivered first here * and then to the target's onTouchEvent(). *
  4. If you return true from here, you will not receive any * following events: the target view will receive the same event but * with the action {@link MotionEvent#ACTION_CANCEL}, and all further * events will be delivered to your onTouchEvent() method and no longer * appear here. *
* * @param ev The motion event being dispatched down the hierarchy. * @return Return true to steal motion events from the children and have * them dispatched to this ViewGroup through onTouchEvent(). * The current target will receive an ACTION_CANCEL event, and no further * messages will be delivered here. */ public boolean onInterceptTouchEvent(MotionEvent ev) { return false; } /** * {@inheritDoc} * * Looks for a view to give focus to respecting the setting specified by * {@link #getDescendantFocusability()}. * * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to * find focus within the children of this group when appropriate. * * @see #FOCUS_BEFORE_DESCENDANTS * @see #FOCUS_AFTER_DESCENDANTS * @see #FOCUS_BLOCK_DESCENDANTS * @see #onRequestFocusInDescendants(int, android.graphics.Rect) */ @Override public boolean requestFocus(int direction, Rect previouslyFocusedRect) { if (DBG) { System.out.println(this + " ViewGroup.requestFocus direction=" + direction); } int descendantFocusability = getDescendantFocusability(); switch (descendantFocusability) { case FOCUS_BLOCK_DESCENDANTS: return super.requestFocus(direction, previouslyFocusedRect); case FOCUS_BEFORE_DESCENDANTS: { final boolean took = super.requestFocus(direction, previouslyFocusedRect); return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); } case FOCUS_AFTER_DESCENDANTS: { final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); return took ? took : super.requestFocus(direction, previouslyFocusedRect); } default: throw new IllegalStateException("descendant focusability must be " + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " + "but is " + descendantFocusability); } } /** * Look for a descendant to call {@link View#requestFocus} on. * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} * when it wants to request focus within its children. Override this to * customize how your {@link ViewGroup} requests focus within its children. * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT * @param previouslyFocusedRect The rectangle (in this View's coordinate system) * to give a finer grained hint about where focus is coming from. May be null * if there is no hint. * @return Whether focus was taken. */ @SuppressWarnings({"ConstantConditions"}) protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) { int index; int increment; int end; int count = mChildrenCount; if ((direction & FOCUS_FORWARD) != 0) { index = 0; increment = 1; end = count; } else { index = count - 1; increment = -1; end = -1; } final View[] children = mChildren; for (int i = index; i != end; i += increment) { View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { if (child.requestFocus(direction, previouslyFocusedRect)) { return true; } } } return false; } /** * {@inheritDoc} * * @hide */ @Override public void dispatchStartTemporaryDetach() { super.dispatchStartTemporaryDetach(); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchStartTemporaryDetach(); } } /** * {@inheritDoc} * * @hide */ @Override public void dispatchFinishTemporaryDetach() { super.dispatchFinishTemporaryDetach(); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchFinishTemporaryDetach(); } } /** * {@inheritDoc} */ @Override void dispatchAttachedToWindow(AttachInfo info, int visibility) { mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; super.dispatchAttachedToWindow(info, visibility); mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { final View child = children[i]; child.dispatchAttachedToWindow(info, visibility | (child.mViewFlags & VISIBILITY_MASK)); } } @Override void dispatchScreenStateChanged(int screenState) { super.dispatchScreenStateChanged(screenState); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchScreenStateChanged(screenState); } } @Override boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { boolean handled = false; if (includeForAccessibility()) { handled = super.dispatchPopulateAccessibilityEventInternal(event); if (handled) { return handled; } } // Let our children have a shot in populating the event. ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); try { final int childCount = children.getChildCount(); for (int i = 0; i < childCount; i++) { View child = children.getChildAt(i); if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { handled = child.dispatchPopulateAccessibilityEvent(event); if (handled) { return handled; } } } } finally { children.recycle(); } return false; } @Override void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { super.onInitializeAccessibilityNodeInfoInternal(info); if (mAttachInfo != null) { ArrayList childrenForAccessibility = mAttachInfo.mTempArrayList; childrenForAccessibility.clear(); addChildrenForAccessibility(childrenForAccessibility); final int childrenForAccessibilityCount = childrenForAccessibility.size(); for (int i = 0; i < childrenForAccessibilityCount; i++) { View child = childrenForAccessibility.get(i); info.addChild(child); } childrenForAccessibility.clear(); } } @Override void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { super.onInitializeAccessibilityEventInternal(event); event.setClassName(ViewGroup.class.getName()); } @Override public void notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) { // If this is a live region, we should send a subtree change event // from this view. Otherwise, we can let it propagate up. if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) { notifyViewAccessibilityStateChangedIfNeeded(changeType); } else if (mParent != null) { try { mParent.notifySubtreeAccessibilityStateChanged(this, source, changeType); } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); } } } @Override void resetSubtreeAccessibilityStateChanged() { super.resetSubtreeAccessibilityStateChanged(); View[] children = mChildren; final int childCount = mChildrenCount; for (int i = 0; i < childCount; i++) { children[i].resetSubtreeAccessibilityStateChanged(); } } /** * {@inheritDoc} */ @Override void dispatchDetachedFromWindow() { // If we still have a touch target, we are still in the process of // dispatching motion events to a child; we need to get rid of that // child to avoid dispatching events to it after the window is torn // down. To make sure we keep the child in a consistent state, we // first send it an ACTION_CANCEL motion event. cancelAndClearTouchTargets(null); // Similarly, set ACTION_EXIT to all hover targets and clear them. exitHoverTargets(); // In case view is detached while transition is running mLayoutCalledWhileSuppressed = false; // Tear down our drag tracking mDragNotifiedChildren = null; if (mCurrentDrag != null) { mCurrentDrag.recycle(); mCurrentDrag = null; } final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { children[i].dispatchDetachedFromWindow(); } super.dispatchDetachedFromWindow(); } /** * @hide */ @Override protected void internalSetPadding(int left, int top, int right, int bottom) { super.internalSetPadding(left, top, right, bottom); if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { mGroupFlags |= FLAG_PADDING_NOT_NULL; } else { mGroupFlags &= ~FLAG_PADDING_NOT_NULL; } } /** * {@inheritDoc} */ @Override protected void dispatchSaveInstanceState(SparseArray container) { super.dispatchSaveInstanceState(container); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { View c = children[i]; if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { c.dispatchSaveInstanceState(container); } } } /** * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} * to only this view, not to its children. For use when overriding * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow * subclasses to freeze their own state but not the state of their children. * * @param container the container */ protected void dispatchFreezeSelfOnly(SparseArray container) { super.dispatchSaveInstanceState(container); } /** * {@inheritDoc} */ @Override protected void dispatchRestoreInstanceState(SparseArray container) { super.dispatchRestoreInstanceState(container); final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { View c = children[i]; if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { c.dispatchRestoreInstanceState(container); } } } /** * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} * to only this view, not to its children. For use when overriding * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow * subclasses to thaw their own state but not the state of their children. * * @param container the container */ protected void dispatchThawSelfOnly(SparseArray container) { super.dispatchRestoreInstanceState(container); } /** * Enables or disables the drawing cache for each child of this view group. * * @param enabled true to enable the cache, false to dispose of it */ protected void setChildrenDrawingCacheEnabled(boolean enabled) { if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { final View[] children = mChildren; final int count = mChildrenCount; for (int i = 0; i < count; i++) { children[i].setDrawingCacheEnabled(enabled); } } } @Override protected void onAnimationStart() { super.onAnimationStart(); // When this ViewGroup's animation starts, build the cache for the children if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { final int count = mChildrenCount; final View[] children = mChildren; final boolean buildCache = !isHardwareAccelerated(); for (int i = 0; i < count; i++) { final View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { child.setDrawingCacheEnabled(true); if (buildCache) { child.buildDrawingCache(true); } } } mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; } } @Override protected void onAnimationEnd() { super.onAnimationEnd(); // When this ViewGroup's animation ends, destroy the cache of the children if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { setChildrenDrawingCacheEnabled(false); } } } @Override Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { int count = mChildrenCount; int[] visibilities = null; if (skipChildren) { visibilities = new int[count]; for (int i = 0; i < count; i++) { View child = getChildAt(i); visibilities[i] = child.getVisibility(); if (visibilities[i] == View.VISIBLE) { child.setVisibility(INVISIBLE); } } } Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); if (skipChildren) { for (int i = 0; i < count; i++) { getChildAt(i).setVisibility(visibilities[i]); } } return b; } /** Return true if this ViewGroup is laying out using optical bounds. */ boolean isLayoutModeOptical() { return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; } Insets computeOpticalInsets() { if (isLayoutModeOptical()) { int left = 0; int top = 0; int right = 0; int bottom = 0; for (int i = 0; i < mChildrenCount; i++) { View child = getChildAt(i); if (child.getVisibility() == VISIBLE) { Insets insets = child.getOpticalInsets(); left = Math.max(left, insets.left); top = Math.max(top, insets.top); right = Math.max(right, insets.right); bottom = Math.max(bottom, insets.bottom); } } return Insets.of(left, top, right, bottom); } else { return Insets.NONE; } } private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { if (x1 != x2 && y1 != y2) { if (x1 > x2) { int tmp = x1; x1 = x2; x2 = tmp; } if (y1 > y2) { int tmp = y1; y1 = y2; y2 = tmp; } canvas.drawRect(x1, y1, x2, y2, paint); } } private static int sign(int x) { return (x >= 0) ? 1 : -1; } private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); } private int dipsToPixels(int dips) { float scale = getContext().getResources().getDisplayMetrics().density; return (int) (dips * scale + 0.5f); } private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, int lineLength, int lineWidth) { drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); } private static void fillDifference(Canvas canvas, int x2, int y2, int x3, int y3, int dx1, int dy1, int dx2, int dy2, Paint paint) { int x1 = x2 - dx1; int y1 = y2 - dy1; int x4 = x3 + dx2; int y4 = y3 + dy2; fillRect(canvas, paint, x1, y1, x4, y2); fillRect(canvas, paint, x1, y2, x2, y3); fillRect(canvas, paint, x3, y2, x4, y3); fillRect(canvas, paint, x1, y3, x4, y4); } /** * @hide */ protected void onDebugDrawMargins(Canvas canvas, Paint paint) { for (int i = 0; i < getChildCount(); i++) { View c = getChildAt(i); c.getLayoutParams().onDebugDraw(c, canvas, paint); } } /** * @hide */ protected void onDebugDraw(Canvas canvas) { Paint paint = getDebugPaint(); // Draw optical bounds { paint.setColor(Color.RED); paint.setStyle(Paint.Style.STROKE); for (int i = 0; i < getChildCount(); i++) { View c = getChildAt(i); Insets insets = c.getOpticalInsets(); drawRect(canvas, paint, c.getLeft() + insets.left, c.getTop() + insets.top, c.getRight() - insets.right - 1, c.getBottom() - insets.bottom - 1); } } // Draw margins { paint.setColor(Color.argb(63, 255, 0, 255)); paint.setStyle(Paint.Style.FILL); onDebugDrawMargins(canvas, paint); } // Draw clip bounds { paint.setColor(Color.rgb(63, 127, 255)); paint.setStyle(Paint.Style.FILL); int lineLength = dipsToPixels(8); int lineWidth = dipsToPixels(1); for (int i = 0; i < getChildCount(); i++) { View c = getChildAt(i); drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), paint, lineLength, lineWidth); } } } /** * {@inheritDoc} */ @Override //ViewGroup 的绘制实际上调用的dispatchDraw,绘制时需要考虑动画问题,而动画实际上就是通过dispatchDraw来实现的 //绘制子组件调用的是drawChild方法, protected void dispatchDraw(Canvas canvas) { final int count = mChildrenCount; final View[] children = mChildren; int flags = mGroupFlags; if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; final boolean buildCache = !isHardwareAccelerated(); for (int i = 0; i < count; i++) { final View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { final LayoutParams params = child.getLayoutParams(); attachLayoutAnimationParameters(child, params, i, count); bindLayoutAnimation(child); if (cache) { child.setDrawingCacheEnabled(true); if (buildCache) { child.buildDrawingCache(true); } } } } final LayoutAnimationController controller = mLayoutAnimationController; if (controller.willOverlap()) { mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; } controller.start(); mGroupFlags &= ~FLAG_RUN_ANIMATION; mGroupFlags &= ~FLAG_ANIMATION_DONE; if (cache) { mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; } if (mAnimationListener != null) { mAnimationListener.onAnimationStart(controller.getAnimation()); } } int saveCount = 0; final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; if (clipToPadding) { saveCount = canvas.save(); canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, mScrollX + mRight - mLeft - mPaddingRight, mScrollY + mBottom - mTop - mPaddingBottom); } // We will draw our child's animation, let's reset the flag mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; boolean more = false; final long drawingTime = getDrawingTime(); if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { for (int i = 0; i < count; i++) { final View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { more |= drawChild(canvas, child, drawingTime); } } } else { for (int i = 0; i < count; i++) { final View child = children[getChildDrawingOrder(count, i)]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { more |= drawChild(canvas, child, drawingTime); } } } // Draw any disappearing views that have animations if (mDisappearingChildren != null) { final ArrayList disappearingChildren = mDisappearingChildren; final int disappearingCount = disappearingChildren.size() - 1; // Go backwards -- we may delete as animations finish for (int i = disappearingCount; i >= 0; i--) { final View child = disappearingChildren.get(i); more |= drawChild(canvas, child, drawingTime); } } if (debugDraw()) { onDebugDraw(canvas); } if (clipToPadding) { canvas.restoreToCount(saveCount); } // mGroupFlags might have been updated by drawChild() flags = mGroupFlags; if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { invalidate(true); } if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && mLayoutAnimationController.isDone() && !more) { // We want to erase the drawing cache and notify the listener after the // next frame is drawn because one extra invalidate() is caused by // drawChild() after the animation is over mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; final Runnable end = new Runnable() { public void run() { notifyAnimationListener(); } }; post(end); } } /** * Returns the ViewGroupOverlay for this view group, creating it if it does * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, * {@link ViewGroupOverlay} allows views to be added to the overlay. These * views, like overlay drawables, are visual-only; they do not receive input * events and should not be used as anything other than a temporary * representation of a view in a parent container, such as might be used * by an animation effect. * *

Note: Overlays do not currently work correctly with {@link * SurfaceView} or {@link TextureView}; contents in overlays for these * types of views may not display correctly.

* * @return The ViewGroupOverlay object for this view. * @see ViewGroupOverlay */ @Override public ViewGroupOverlay getOverlay() { if (mOverlay == null) { mOverlay = new ViewGroupOverlay(mContext, this); } return (ViewGroupOverlay) mOverlay; } /** * Returns the index of the child to draw for this iteration. Override this * if you want to change the drawing order of children. By default, it * returns i. *

* NOTE: In order for this method to be called, you must enable child ordering * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. * * @param i The current iteration. * @return The index of the child to draw this iteration. * * @see #setChildrenDrawingOrderEnabled(boolean) * @see #isChildrenDrawingOrderEnabled() */ protected int getChildDrawingOrder(int childCount, int i) { return i; } private void notifyAnimationListener() { mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; mGroupFlags |= FLAG_ANIMATION_DONE; if (mAnimationListener != null) { final Runnable end = new Runnable() { public void run() { mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); } }; post(end); } if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { setChildrenDrawingCacheEnabled(false); } } invalidate(true); } /** * This method is used to cause children of this ViewGroup to restore or recreate their * display lists. It is called by getDisplayList() when the parent ViewGroup does not need * to recreate its own display list, which would happen if it went through the normal * draw/dispatchDraw mechanisms. * * @hide */ @Override protected void dispatchGetDisplayList() { final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { final View child = children[i]; if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && child.hasStaticLayer()) { child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; child.mPrivateFlags &= ~PFLAG_INVALIDATED; child.getDisplayList(); child.mRecreateDisplayList = false; } } if (mOverlay != null) { View overlayView = mOverlay.getOverlayView(); overlayView.mRecreateDisplayList = (overlayView.mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; overlayView.mPrivateFlags &= ~PFLAG_INVALIDATED; overlayView.getDisplayList(); overlayView.mRecreateDisplayList = false; } } /** * Draw one child of this View Group. This method is responsible for getting * the canvas in the right state. This includes clipping, translating so * that the child's scrolled origin is at 0, 0, and applying any animation * transformations. * * @param canvas The canvas on which to draw the child * @param child Who to draw * @param drawingTime The time at which draw is occurring * @return True if an invalidate() was issued */ protected boolean drawChild(Canvas canvas, View child, long drawingTime) { return child.draw(canvas, this, drawingTime); } /** * Returns whether ths group's children are clipped to their bounds before drawing. * The default value is true. * @see #setClipChildren(boolean) * * @return True if the group's children will be clipped to their bounds, * false otherwise. */ public boolean getClipChildren() { return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); } /** * By default, children are clipped to their bounds before drawing. This * allows view groups to override this behavior for animations, etc. * * @param clipChildren true to clip children to their bounds, * false otherwise * @attr ref android.R.styleable#ViewGroup_clipChildren */ public void setClipChildren(boolean clipChildren) { boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; if (clipChildren != previousValue) { setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); for (int i = 0; i < mChildrenCount; ++i) { View child = getChildAt(i); if (child.mDisplayList != null) { child.mDisplayList.setClipToBounds(clipChildren); } } } } /** * By default, children are clipped to the padding of the ViewGroup. This * allows view groups to override this behavior * * @param clipToPadding true to clip children to the padding of the * group, false otherwise * @attr ref android.R.styleable#ViewGroup_clipToPadding */ public void setClipToPadding(boolean clipToPadding) { setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); } /** * {@inheritDoc} */ @Override public void dispatchSetSelected(boolean selected) { final View[] children = mChildren; final int count = mChildrenCount; for (int i = 0; i < count; i++) { children[i].setSelected(selected); } } /** * {@inheritDoc} */ @Override public void dispatchSetActivated(boolean activated) { final View[] children = mChildren; final int count = mChildrenCount; for (int i = 0; i < count; i++) { children[i].setActivated(activated); } } @Override protected void dispatchSetPressed(boolean pressed) { final View[] children = mChildren; final int count = mChildrenCount; for (int i = 0; i < count; i++) { final View child = children[i]; // Children that are clickable on their own should not // show a pressed state when their parent view does. // Clearing a pressed state always propagates. if (!pressed || (!child.isClickable() && !child.isLongClickable())) { child.setPressed(pressed); } } } @Override void dispatchCancelPendingInputEvents() { super.dispatchCancelPendingInputEvents(); final View[] children = mChildren; final int count = mChildrenCount; for (int i = 0; i < count; i++) { children[i].dispatchCancelPendingInputEvents(); } } /** * When this property is set to true, this ViewGroup supports static transformations on * children; this causes * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be * invoked when a child is drawn. * * Any subclass overriding * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should * set this property to true. * * @param enabled True to enable static transformations on children, false otherwise. * * @see #getChildStaticTransformation(View, android.view.animation.Transformation) */ protected void setStaticTransformationsEnabled(boolean enabled) { setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); } /** * Sets t to be the static transformation of the child, if set, returning a * boolean to indicate whether a static transform was set. The default implementation * simply returns false; subclasses may override this method for different * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true * for this method to be called. * * @param child The child view whose static transform is being requested * @param t The Transformation which will hold the result * @return true if the transformation was set, false otherwise * @see #setStaticTransformationsEnabled(boolean) */ protected boolean getChildStaticTransformation(View child, Transformation t) { return false; } Transformation getChildTransformation() { if (mChildTransformation == null) { mChildTransformation = new Transformation(); } return mChildTransformation; } /** * {@hide} */ @Override protected View findViewTraversal(int id) { if (id == mID) { return this; } final View[] where = mChildren; final int len = mChildrenCount; for (int i = 0; i < len; i++) { View v = where[i]; if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { v = v.findViewById(id); if (v != null) { return v; } } } return null; } /** * {@hide} */ @Override protected View findViewWithTagTraversal(Object tag) { if (tag != null && tag.equals(mTag)) { return this; } final View[] where = mChildren; final int len = mChildrenCount; for (int i = 0; i < len; i++) { View v = where[i]; if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { v = v.findViewWithTag(tag); if (v != null) { return v; } } } return null; } /** * {@hide} */ @Override protected View findViewByPredicateTraversal(Predicate predicate, View childToSkip) { if (predicate.apply(this)) { return this; } final View[] where = mChildren; final int len = mChildrenCount; for (int i = 0; i < len; i++) { View v = where[i]; if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { v = v.findViewByPredicate(predicate); if (v != null) { return v; } } } return null; } /** *

Adds a child view. If no layout parameters are already set on the child, the * default parameters for this ViewGroup are set on the child.

* *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param child the child view to add * * @see #generateDefaultLayoutParams() */ public void addView(View child) { addView(child, -1); } /** * Adds a child view. If no layout parameters are already set on the child, the * default parameters for this ViewGroup are set on the child. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param child the child view to add * @param index the position at which to add the child * * @see #generateDefaultLayoutParams() */ public void addView(View child, int index) { LayoutParams params = child.getLayoutParams(); if (params == null) { params = generateDefaultLayoutParams(); if (params == null) { throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); } } addView(child, index, params); } /** * Adds a child view with this ViewGroup's default layout parameters and the * specified width and height. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param child the child view to add */ public void addView(View child, int width, int height) { final LayoutParams params = generateDefaultLayoutParams(); params.width = width; params.height = height; addView(child, -1, params); } /** * Adds a child view with the specified layout parameters. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param child the child view to add * @param params the layout parameters to set on the child */ public void addView(View child, LayoutParams params) { addView(child, -1, params); } /** * Adds a child view with the specified layout parameters. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param child the child view to add * @param index the position at which to add the child * @param params the layout parameters to set on the child */ public void addView(View child, int index, LayoutParams params) { if (DBG) { System.out.println(this + " addView"); } // addViewInner() will call child.requestLayout() when setting the new LayoutParams // therefore, we call requestLayout() on ourselves before, so that the child's request // will be blocked at our level requestLayout(); invalidate(true); addViewInner(child, index, params, false); } /** * {@inheritDoc} */ public void updateViewLayout(View view, ViewGroup.LayoutParams params) { if (!checkLayoutParams(params)) { throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); } if (view.mParent != this) { throw new IllegalArgumentException("Given view not a child of " + this); } view.setLayoutParams(params); } /** * {@inheritDoc} */ protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { return p != null; } /** * Interface definition for a callback to be invoked when the hierarchy * within this view changed. The hierarchy changes whenever a child is added * to or removed from this view. */ public interface OnHierarchyChangeListener { /** * Called when a new child is added to a parent view. * * @param parent the view in which a child was added * @param child the new child view added in the hierarchy */ void onChildViewAdded(View parent, View child); /** * Called when a child is removed from a parent view. * * @param parent the view from which the child was removed * @param child the child removed from the hierarchy */ void onChildViewRemoved(View parent, View child); } /** * Register a callback to be invoked when a child is added to or removed * from this view. * * @param listener the callback to invoke on hierarchy change */ public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { mOnHierarchyChangeListener = listener; } /** * @hide */ protected void onViewAdded(View child) { if (mOnHierarchyChangeListener != null) { mOnHierarchyChangeListener.onChildViewAdded(this, child); } } /** * @hide */ protected void onViewRemoved(View child) { if (mOnHierarchyChangeListener != null) { mOnHierarchyChangeListener.onChildViewRemoved(this, child); } } private void clearCachedLayoutMode() { if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { mLayoutMode = LAYOUT_MODE_UNDEFINED; } } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); clearCachedLayoutMode(); } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); clearCachedLayoutMode(); } /** * Adds a view during layout. This is useful if in your onLayout() method, * you need to add more views (as does the list view for example). * * If index is negative, it means put it at the end of the list. * * @param child the view to add to the group * @param index the index at which the child must be added * @param params the layout parameters to associate with the child * @return true if the child was added, false otherwise */ //添加View的算法 //addViewInLayout addViewInner addInArray 这四个方法都是添加View的核心算法的封装,它们是层层调用的关系,而我们通常调用的addView就是最终通过这几个函数来添加View到ViewGroup中的 protected boolean addViewInLayout(View child, int index, LayoutParams params) { return addViewInLayout(child, index, params, false); } /** * Adds a view during layout. This is useful if in your onLayout() method, * you need to add more views (as does the list view for example). * * If index is negative, it means put it at the end of the list. * * @param child the view to add to the group * @param index the index at which the child must be added * @param params the layout parameters to associate with the child * @param preventRequestLayout if true, calling this method will not trigger a * layout request on child * @return true if the child was added, false otherwise */ protected boolean addViewInLayout(View child, int index, LayoutParams params, boolean preventRequestLayout) { child.mParent = null; addViewInner(child, index, params, preventRequestLayout); child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; return true; } /** * Prevents the specified child to be laid out during the next layout pass. * * @param child the child on which to perform the cleanup */ protected void cleanupLayoutState(View child) { child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; } private void addViewInner(View child, int index, LayoutParams params, boolean preventRequestLayout) { if (mTransition != null) { // Don't prevent other add transitions from completing, but cancel remove // transitions to let them complete the process before we add to the container mTransition.cancel(LayoutTransition.DISAPPEARING); } //首先是对子View是否已经包含到一个父容器中,主要的是防止添加一个已有父容器的VIew,因为添加一个拥有父容器的 //View时会碰到各种问题。比如记录本身父容器算法的问题,本身被多个父容器包含时更新的处理等等一系列的问题 if (child.getParent() != null) { throw new IllegalStateException("The specified child already has a parent. " + "You must call removeView() on the child's parent first."); } if (mTransition != null) { mTransition.addChild(this, child); } //对子View布局参数的处理 if (!checkLayoutParams(params)) { params = generateLayoutParams(params); } if (preventRequestLayout) { child.mLayoutParams = params; } else { child.setLayoutParams(params); } if (index < 0) { index = mChildrenCount; } //调用addInArray来添加View addInArray(child, index); // tell our children //父VIew为当前的ViewGroup if (preventRequestLayout) { child.assignParent(this); } else { child.mParent = this; } //焦点的处理 if (child.hasFocus()) { requestChildFocus(child, child.findFocus()); } //当前View的AttachInfo信息,这个信息是用来在窗口处理中用的。 //Android的窗口系统就是通过AttachInfo来判断View的所属窗口的 AttachInfo ai = mAttachInfo; if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { boolean lastKeepOn = ai.mKeepScreenOn; ai.mKeepScreenOn = false; child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); if (ai.mKeepScreenOn) { needGlobalAttributesUpdate(true); } ai.mKeepScreenOn = lastKeepOn; } if (child.isLayoutDirectionInherited()) { child.resetRtlProperties(); } //View 树改变的监听 onViewAdded(child); //子View中的mViewFlags的设置 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; } if (child.hasTransientState()) { childHasTransientStateChanged(child, true); } if (child.isImportantForAccessibility() && child.getVisibility() != View.GONE) { notifySubtreeAccessibilityStateChangedIfNeeded(); } } //此类里面主要是通过System.arraycopy来添加View的 private void addInArray(View child, int index) { View[] children = mChildren; final int count = mChildrenCount; final int size = children.length; if (index == count) { if (size == count) { mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; System.arraycopy(children, 0, mChildren, 0, size); children = mChildren; } children[mChildrenCount++] = child; } else if (index < count) { if (size == count) { mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; System.arraycopy(children, 0, mChildren, 0, index); System.arraycopy(children, index, mChildren, index + 1, count - index); children = mChildren; } else { System.arraycopy(children, index, children, index + 1, count - index); } children[index] = child; mChildrenCount++; if (mLastTouchDownIndex >= index) { mLastTouchDownIndex++; } } else { throw new IndexOutOfBoundsException("index=" + index + " count=" + count); } } // This method also sets the child's mParent to null //移除View的方式 private void removeFromArray(int index) { final View[] children = mChildren; if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { children[index].mParent = null; } final int count = mChildrenCount; if (index == count - 1) { children[--mChildrenCount] = null; } else if (index >= 0 && index < count) { System.arraycopy(children, index + 1, children, index, count - index - 1); children[--mChildrenCount] = null; } else { throw new IndexOutOfBoundsException(); } if (mLastTouchDownIndex == index) { mLastTouchDownTime = 0; mLastTouchDownIndex = -1; } else if (mLastTouchDownIndex > index) { mLastTouchDownIndex--; } } // This method also sets the children's mParent to null private void removeFromArray(int start, int count) { final View[] children = mChildren; final int childrenCount = mChildrenCount; start = Math.max(0, start); final int end = Math.min(childrenCount, start + count); if (start == end) { return; } if (end == childrenCount) { for (int i = start; i < end; i++) { children[i].mParent = null; children[i] = null; } } else { for (int i = start; i < end; i++) { children[i].mParent = null; } // Since we're looping above, we might as well do the copy, but is arraycopy() // faster than the extra 2 bounds checks we would do in the loop? System.arraycopy(children, end, children, start, childrenCount - end); for (int i = childrenCount - (end - start); i < childrenCount; i++) { children[i] = null; } } mChildrenCount -= (end - start); } private void bindLayoutAnimation(View child) { Animation a = mLayoutAnimationController.getAnimationForView(child); child.setAnimation(a); } /** * Subclasses should override this method to set layout animation * parameters on the supplied child. * * @param child the child to associate with animation parameters * @param params the child's layout parameters which hold the animation * parameters * @param index the index of the child in the view group * @param count the number of children in the view group */ protected void attachLayoutAnimationParameters(View child, LayoutParams params, int index, int count) { LayoutAnimationController.AnimationParameters animationParams = params.layoutAnimationParameters; if (animationParams == null) { animationParams = new LayoutAnimationController.AnimationParameters(); params.layoutAnimationParameters = animationParams; } animationParams.count = count; animationParams.index = index; } /** * {@inheritDoc} * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

*/ public void removeView(View view) { removeViewInternal(view); requestLayout(); invalidate(true); } /** * Removes a view during layout. This is useful if in your onLayout() method, * you need to remove more views. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param view the view to remove from the group */ public void removeViewInLayout(View view) { removeViewInternal(view); } /** * Removes a range of views during layout. This is useful if in your onLayout() method, * you need to remove more views. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param start the index of the first view to remove from the group * @param count the number of views to remove from the group */ public void removeViewsInLayout(int start, int count) { removeViewsInternal(start, count); } /** * Removes the view at the specified position in the group. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param index the position in the group of the view to remove */ public void removeViewAt(int index) { removeViewInternal(index, getChildAt(index)); requestLayout(); invalidate(true); } /** * Removes the specified range of views from the group. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

* * @param start the first position in the group of the range of views to remove * @param count the number of views to remove */ public void removeViews(int start, int count) { removeViewsInternal(start, count); requestLayout(); invalidate(true); } private void removeViewInternal(View view) { final int index = indexOfChild(view); if (index >= 0) { removeViewInternal(index, view); } } private void removeViewInternal(int index, View view) { if (mTransition != null) { mTransition.removeChild(this, view); } boolean clearChildFocus = false; if (view == mFocused) { view.unFocus(); clearChildFocus = true; } if (view.isAccessibilityFocused()) { view.clearAccessibilityFocus(); } cancelTouchTarget(view); cancelHoverTarget(view); if (view.getAnimation() != null || (mTransitioningViews != null && mTransitioningViews.contains(view))) { addDisappearingView(view); } else if (view.mAttachInfo != null) { view.dispatchDetachedFromWindow(); } if (view.hasTransientState()) { childHasTransientStateChanged(view, false); } needGlobalAttributesUpdate(false); removeFromArray(index); if (clearChildFocus) { clearChildFocus(view); if (!rootViewRequestFocus()) { notifyGlobalFocusCleared(this); } } onViewRemoved(view); if (view.isImportantForAccessibility() && view.getVisibility() != View.GONE) { notifySubtreeAccessibilityStateChangedIfNeeded(); } } /** * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is * not null, changes in layout which occur because of children being added to or removed from * the ViewGroup will be animated according to the animations defined in that LayoutTransition * object. By default, the transition object is null (so layout changes are not animated). * *

Replacing a non-null transition will cause that previous transition to be * canceled, if it is currently running, to restore this container to * its correct post-transition state.

* * @param transition The LayoutTransition object that will animated changes in layout. A value * of null means no transition will run on layout changes. * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges */ public void setLayoutTransition(LayoutTransition transition) { if (mTransition != null) { LayoutTransition previousTransition = mTransition; previousTransition.cancel(); previousTransition.removeTransitionListener(mLayoutTransitionListener); } mTransition = transition; if (mTransition != null) { mTransition.addTransitionListener(mLayoutTransitionListener); } } /** * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is * not null, changes in layout which occur because of children being added to or removed from * the ViewGroup will be animated according to the animations defined in that LayoutTransition * object. By default, the transition object is null (so layout changes are not animated). * * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. * A value of null means no transition will run on layout changes. */ public LayoutTransition getLayoutTransition() { return mTransition; } private void removeViewsInternal(int start, int count) { final View focused = mFocused; final boolean detach = mAttachInfo != null; boolean clearChildFocus = false; final View[] children = mChildren; final int end = start + count; for (int i = start; i < end; i++) { final View view = children[i]; if (mTransition != null) { mTransition.removeChild(this, view); } if (view == focused) { view.unFocus(); clearChildFocus = true; } if (view.isAccessibilityFocused()) { view.clearAccessibilityFocus(); } cancelTouchTarget(view); cancelHoverTarget(view); if (view.getAnimation() != null || (mTransitioningViews != null && mTransitioningViews.contains(view))) { addDisappearingView(view); } else if (detach) { view.dispatchDetachedFromWindow(); } if (view.hasTransientState()) { childHasTransientStateChanged(view, false); } needGlobalAttributesUpdate(false); onViewRemoved(view); } removeFromArray(start, count); if (clearChildFocus) { clearChildFocus(focused); if (!rootViewRequestFocus()) { notifyGlobalFocusCleared(focused); } } } /** * Call this method to remove all child views from the * ViewGroup. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

*/ public void removeAllViews() { removeAllViewsInLayout(); requestLayout(); invalidate(true); } /** * Called by a ViewGroup subclass to remove child views from itself, * when it must first know its size on screen before it can calculate how many * child views it will render. An example is a Gallery or a ListView, which * may "have" 50 children, but actually only render the number of children * that can currently fit inside the object on screen. Do not call * this method unless you are extending ViewGroup and understand the * view measuring and layout pipeline. * *

Note: do not invoke this method from * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.

*/ public void removeAllViewsInLayout() { final int count = mChildrenCount; if (count <= 0) { return; } final View[] children = mChildren; mChildrenCount = 0; final View focused = mFocused; final boolean detach = mAttachInfo != null; boolean clearChildFocus = false; needGlobalAttributesUpdate(false); for (int i = count - 1; i >= 0; i--) { final View view = children[i]; if (mTransition != null) { mTransition.removeChild(this, view); } if (view == focused) { view.unFocus(); clearChildFocus = true; } if (view.isAccessibilityFocused()) { view.clearAccessibilityFocus(); } cancelTouchTarget(view); cancelHoverTarget(view); if (view.getAnimation() != null || (mTransitioningViews != null && mTransitioningViews.contains(view))) { addDisappearingView(view); } else if (detach) { view.dispatchDetachedFromWindow(); } if (view.hasTransientState()) { childHasTransientStateChanged(view, false); } onViewRemoved(view); view.mParent = null; children[i] = null; } if (clearChildFocus) { clearChildFocus(focused); if (!rootViewRequestFocus()) { notifyGlobalFocusCleared(focused); } } } /** * Finishes the removal of a detached view. This method will dispatch the detached from * window event and notify the hierarchy change listener. *

* This method is intended to be lightweight and makes no assumptions about whether the * parent or child should be redrawn. Proper use of this method will include also making * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. * For example, callers can {@link #post(Runnable) post} a {@link Runnable} * which performs a {@link #requestLayout()} on the next frame, after all detach/remove * calls are finished, causing layout to be run prior to redrawing the view hierarchy. * * @param child the child to be definitely removed from the view hierarchy * @param animate if true and the view has an animation, the view is placed in the * disappearing views list, otherwise, it is detached from the window * * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) * @see #detachAllViewsFromParent() * @see #detachViewFromParent(View) * @see #detachViewFromParent(int) */ protected void removeDetachedView(View child, boolean animate) { if (mTransition != null) { mTransition.removeChild(this, child); } if (child == mFocused) { child.clearFocus(); } child.clearAccessibilityFocus(); cancelTouchTarget(child); cancelHoverTarget(child); if ((animate && child.getAnimation() != null) || (mTransitioningViews != null && mTransitioningViews.contains(child))) { addDisappearingView(child); } else if (child.mAttachInfo != null) { child.dispatchDetachedFromWindow(); } if (child.hasTransientState()) { childHasTransientStateChanged(child, false); } onViewRemoved(child); } /** * Attaches a view to this view group. Attaching a view assigns this group as the parent, * sets the layout parameters and puts the view in the list of children so that * it can be retrieved by calling {@link #getChildAt(int)}. *

* This method is intended to be lightweight and makes no assumptions about whether the * parent or child should be redrawn. Proper use of this method will include also making * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. * For example, callers can {@link #post(Runnable) post} a {@link Runnable} * which performs a {@link #requestLayout()} on the next frame, after all detach/attach * calls are finished, causing layout to be run prior to redrawing the view hierarchy. *

* This method should be called only for views which were detached from their parent. * * @param child the child to attach * @param index the index at which the child should be attached * @param params the layout parameters of the child * * @see #removeDetachedView(View, boolean) * @see #detachAllViewsFromParent() * @see #detachViewFromParent(View) * @see #detachViewFromParent(int) */ protected void attachViewToParent(View child, int index, LayoutParams params) { child.mLayoutParams = params; if (index < 0) { index = mChildrenCount; } addInArray(child, index); child.mParent = this; child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK & ~PFLAG_DRAWING_CACHE_VALID) | PFLAG_DRAWN | PFLAG_INVALIDATED; this.mPrivateFlags |= PFLAG_INVALIDATED; if (child.hasFocus()) { requestChildFocus(child, child.findFocus()); } } /** * Detaches a view from its parent. Detaching a view should be followed * either by a call to * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be * temporary; reattachment or removal should happen within the same drawing cycle as * detachment. When a view is detached, its parent is null and cannot be retrieved by a * call to {@link #getChildAt(int)}. * * @param child the child to detach * * @see #detachViewFromParent(int) * @see #detachViewsFromParent(int, int) * @see #detachAllViewsFromParent() * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) * @see #removeDetachedView(View, boolean) */ protected void detachViewFromParent(View child) { removeFromArray(indexOfChild(child)); } /** * Detaches a view from its parent. Detaching a view should be followed * either by a call to * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be * temporary; reattachment or removal should happen within the same drawing cycle as * detachment. When a view is detached, its parent is null and cannot be retrieved by a * call to {@link #getChildAt(int)}. * * @param index the index of the child to detach * * @see #detachViewFromParent(View) * @see #detachAllViewsFromParent() * @see #detachViewsFromParent(int, int) * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) * @see #removeDetachedView(View, boolean) */ protected void detachViewFromParent(int index) { removeFromArray(index); } /** * Detaches a range of views from their parents. Detaching a view should be followed * either by a call to * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be * temporary; reattachment or removal should happen within the same drawing cycle as * detachment. When a view is detached, its parent is null and cannot be retrieved by a * call to {@link #getChildAt(int)}. * * @param start the first index of the childrend range to detach * @param count the number of children to detach * * @see #detachViewFromParent(View) * @see #detachViewFromParent(int) * @see #detachAllViewsFromParent() * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) * @see #removeDetachedView(View, boolean) */ protected void detachViewsFromParent(int start, int count) { removeFromArray(start, count); } /** * Detaches all views from the parent. Detaching a view should be followed * either by a call to * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be * temporary; reattachment or removal should happen within the same drawing cycle as * detachment. When a view is detached, its parent is null and cannot be retrieved by a * call to {@link #getChildAt(int)}. * * @see #detachViewFromParent(View) * @see #detachViewFromParent(int) * @see #detachViewsFromParent(int, int) * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) * @see #removeDetachedView(View, boolean) */ protected void detachAllViewsFromParent() { final int count = mChildrenCount; if (count <= 0) { return; } final View[] children = mChildren; mChildrenCount = 0; for (int i = count - 1; i >= 0; i--) { children[i].mParent = null; children[i] = null; } } /** * Don't call or override this method. It is used for the implementation of * the view hierarchy. */ public final void invalidateChild(View child, final Rect dirty) { ViewParent parent = this; final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { // If the child is drawing an animation, we want to copy this flag onto // ourselves and the parent to make sure the invalidate request goes // through final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION; // Check whether the child that requests the invalidate is fully opaque // Views being animated or transformed are not considered opaque because we may // be invalidating their old position and need the parent to paint behind them. Matrix childMatrix = child.getMatrix(); final boolean isOpaque = child.isOpaque() && !drawAnimation && child.getAnimation() == null && childMatrix.isIdentity(); // Mark the child as dirty, using the appropriate flag // Make sure we do not set both flags at the same time int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; if (child.mLayerType != LAYER_TYPE_NONE) { mPrivateFlags |= PFLAG_INVALIDATED; mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; child.mLocalDirtyRect.union(dirty); } final int[] location = attachInfo.mInvalidateChildLocation; location[CHILD_LEFT_INDEX] = child.mLeft; location[CHILD_TOP_INDEX] = child.mTop; if (!childMatrix.isIdentity() || (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { RectF boundingRect = attachInfo.mTmpTransformRect; boundingRect.set(dirty); Matrix transformMatrix; if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { Transformation t = attachInfo.mTmpTransformation; boolean transformed = getChildStaticTransformation(child, t); if (transformed) { transformMatrix = attachInfo.mTmpMatrix; transformMatrix.set(t.getMatrix()); if (!childMatrix.isIdentity()) { transformMatrix.preConcat(childMatrix); } } else { transformMatrix = childMatrix; } } else { transformMatrix = childMatrix; } transformMatrix.mapRect(boundingRect); dirty.set((int) (boundingRect.left - 0.5f), (int) (boundingRect.top - 0.5f), (int) (boundingRect.right + 0.5f), (int) (boundingRect.bottom + 0.5f)); } do { View view = null; if (parent instanceof View) { view = (View) parent; } if (drawAnimation) { if (view != null) { view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; } else if (parent instanceof ViewRootImpl) { ((ViewRootImpl) parent).mIsAnimating = true; } } // If the parent is dirty opaque or not dirty, mark it dirty with the opaque // flag coming from the child that initiated the invalidate if (view != null) { if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && view.getSolidColor() == 0) { opaqueFlag = PFLAG_DIRTY; } if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; } } parent = parent.invalidateChildInParent(location, dirty); if (view != null) { // Account for transform on current parent Matrix m = view.getMatrix(); if (!m.isIdentity()) { RectF boundingRect = attachInfo.mTmpTransformRect; boundingRect.set(dirty); m.mapRect(boundingRect); dirty.set((int) (boundingRect.left - 0.5f), (int) (boundingRect.top - 0.5f), (int) (boundingRect.right + 0.5f), (int) (boundingRect.bottom + 0.5f)); } } } while (parent != null); } } /** * Don't call or override this method. It is used for the implementation of * the view hierarchy. * * This implementation returns null if this ViewGroup does not have a parent, * if this ViewGroup is already fully invalidated or if the dirty rectangle * does not intersect with this ViewGroup's bounds. */ public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != FLAG_OPTIMIZE_INVALIDATE) { dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, location[CHILD_TOP_INDEX] - mScrollY); if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { dirty.union(0, 0, mRight - mLeft, mBottom - mTop); } final int left = mLeft; final int top = mTop; if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { dirty.setEmpty(); } } mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; location[CHILD_LEFT_INDEX] = left; location[CHILD_TOP_INDEX] = top; if (mLayerType != LAYER_TYPE_NONE) { mPrivateFlags |= PFLAG_INVALIDATED; mLocalDirtyRect.union(dirty); } return mParent; } else { mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; location[CHILD_LEFT_INDEX] = mLeft; location[CHILD_TOP_INDEX] = mTop; if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { dirty.set(0, 0, mRight - mLeft, mBottom - mTop); } else { // in case the dirty rect extends outside the bounds of this container dirty.union(0, 0, mRight - mLeft, mBottom - mTop); } if (mLayerType != LAYER_TYPE_NONE) { mPrivateFlags |= PFLAG_INVALIDATED; mLocalDirtyRect.union(dirty); } return mParent; } } return null; } /** * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods * do; all we want to do here is schedule a traversal with the appropriate dirty rect. * * @hide */ public void invalidateChildFast(View child, final Rect dirty) { ViewParent parent = this; final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { if (child.mLayerType != LAYER_TYPE_NONE) { child.mLocalDirtyRect.union(dirty); } int left = child.mLeft; int top = child.mTop; if (!child.getMatrix().isIdentity()) { child.transformRect(dirty); } do { if (parent instanceof ViewGroup) { ViewGroup parentVG = (ViewGroup) parent; if (parentVG.mLayerType != LAYER_TYPE_NONE) { // Layered parents should be recreated, not just re-issued parentVG.invalidate(); parent = null; } else { parent = parentVG.invalidateChildInParentFast(left, top, dirty); left = parentVG.mLeft; top = parentVG.mTop; } } else { // Reached the top; this calls into the usual invalidate method in // ViewRootImpl, which schedules a traversal final int[] location = attachInfo.mInvalidateChildLocation; location[0] = left; location[1] = top; parent = parent.invalidateChildInParent(location, dirty); } } while (parent != null); } } /** * Quick invalidation method that simply transforms the dirty rect into the parent's * coordinate system, pruning the invalidation if the parent has already been invalidated. * * @hide */ protected ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { dirty.offset(left - mScrollX, top - mScrollY); if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { dirty.union(0, 0, mRight - mLeft, mBottom - mTop); } if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { if (mLayerType != LAYER_TYPE_NONE) { mLocalDirtyRect.union(dirty); } if (!getMatrix().isIdentity()) { transformRect(dirty); } return mParent; } } return null; } /** * Offset a rectangle that is in a descendant's coordinate * space into our coordinate space. * @param descendant A descendant of this view * @param rect A rectangle defined in descendant's coordinate space. */ public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { offsetRectBetweenParentAndChild(descendant, rect, true, false); } /** * Offset a rectangle that is in our coordinate space into an ancestor's * coordinate space. * @param descendant A descendant of this view * @param rect A rectangle defined in descendant's coordinate space. */ public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { offsetRectBetweenParentAndChild(descendant, rect, false, false); } /** * Helper method that offsets a rect either from parent to descendant or * descendant to parent. */ void offsetRectBetweenParentAndChild(View descendant, Rect rect, boolean offsetFromChildToParent, boolean clipToBounds) { // already in the same coord system :) if (descendant == this) { return; } ViewParent theParent = descendant.mParent; // search and offset up to the parent while ((theParent != null) && (theParent instanceof View) && (theParent != this)) { if (offsetFromChildToParent) { rect.offset(descendant.mLeft - descendant.mScrollX, descendant.mTop - descendant.mScrollY); if (clipToBounds) { View p = (View) theParent; rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); } } else { if (clipToBounds) { View p = (View) theParent; rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); } rect.offset(descendant.mScrollX - descendant.mLeft, descendant.mScrollY - descendant.mTop); } descendant = (View) theParent; theParent = descendant.mParent; } // now that we are up to this view, need to offset one more time // to get into our coordinate space if (theParent == this) { if (offsetFromChildToParent) { rect.offset(descendant.mLeft - descendant.mScrollX, descendant.mTop - descendant.mScrollY); } else { rect.offset(descendant.mScrollX - descendant.mLeft, descendant.mScrollY - descendant.mTop); } } else { /* SPRD: in the state of monkey test, due to the fast operation, parent has been * destroyed before drawing the child ,so this case occur @{ */ if (android.os.Debug.isMonkey()) { Log.e(TAG, "parameter must be a descendant of this view, theParent: " + theParent + ",this: " + this); rect.set(-1, -1, -1, -1); /* @} */ } else { throw new IllegalArgumentException("parameter must be a descendant of this view"); } } } /** * Offset the vertical location of all children of this view by the specified number of pixels. * * @param offset the number of pixels to offset * * @hide */ public void offsetChildrenTopAndBottom(int offset) { final int count = mChildrenCount; final View[] children = mChildren; boolean invalidate = false; for (int i = 0; i < count; i++) { final View v = children[i]; v.mTop += offset; v.mBottom += offset; if (v.mDisplayList != null) { invalidate = true; v.mDisplayList.offsetTopAndBottom(offset); } } if (invalidate) { invalidateViewProperty(false, false); } } /** * {@inheritDoc} */ public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { // It doesn't make a whole lot of sense to call this on a view that isn't attached, // but for some simple tests it can be useful. If we don't have attach info this // will allocate memory. final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); rect.set(r); if (!child.hasIdentityMatrix()) { child.getMatrix().mapRect(rect); } int dx = child.mLeft - mScrollX; int dy = child.mTop - mScrollY; rect.offset(dx, dy); if (offset != null) { if (!child.hasIdentityMatrix()) { float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation : new float[2]; position[0] = offset.x; position[1] = offset.y; child.getMatrix().mapPoints(position); offset.x = (int) (position[0] + 0.5f); offset.y = (int) (position[1] + 0.5f); } offset.x += dx; offset.y += dy; } if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { if (mParent == null) return true; r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); return mParent.getChildVisibleRect(this, r, offset); } return false; } /** * {@inheritDoc} */ @Override public final void layout(int l, int t, int r, int b) { if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { if (mTransition != null) { mTransition.layoutChange(this); } super.layout(l, t, r, b); } else { // record the fact that we noop'd it; request layout when transition finishes mLayoutCalledWhileSuppressed = true; } } /** * {@inheritDoc} */ @Override //onLayout是一个抽像函数,要求实现ViewGroup的函数必须实现这个函数,这也就是ViewGroup是一个抽像函数的原因。因为各种组件实现的布局方式不一样 protected abstract void onLayout(boolean changed, int l, int t, int r, int b); /** * Indicates whether the view group has the ability to animate its children * after the first layout. * * @return true if the children can be animated, false otherwise */ protected boolean canAnimate() { return mLayoutAnimationController != null; } /** * Runs the layout animation. Calling this method triggers a relayout of * this view group. */ public void startLayoutAnimation() { if (mLayoutAnimationController != null) { mGroupFlags |= FLAG_RUN_ANIMATION; requestLayout(); } } /** * Schedules the layout animation to be played after the next layout pass * of this view group. This can be used to restart the layout animation * when the content of the view group changes or when the activity is * paused and resumed. */ public void scheduleLayoutAnimation() { mGroupFlags |= FLAG_RUN_ANIMATION; } /** * Sets the layout animation controller used to animate the group's * children after the first layout. * * @param controller the animation controller */ public void setLayoutAnimation(LayoutAnimationController controller) { mLayoutAnimationController = controller; if (mLayoutAnimationController != null) { mGroupFlags |= FLAG_RUN_ANIMATION; } } /** * Returns the layout animation controller used to animate the group's * children. * * @return the current animation controller */ public LayoutAnimationController getLayoutAnimation() { return mLayoutAnimationController; } /** * Indicates whether the children's drawing cache is used during a layout * animation. By default, the drawing cache is enabled but this will prevent * nested layout animations from working. To nest animations, you must disable * the cache. * * @return true if the animation cache is enabled, false otherwise * * @see #setAnimationCacheEnabled(boolean) * @see View#setDrawingCacheEnabled(boolean) */ @ViewDebug.ExportedProperty public boolean isAnimationCacheEnabled() { return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; } /** * Enables or disables the children's drawing cache during a layout animation. * By default, the drawing cache is enabled but this will prevent nested * layout animations from working. To nest animations, you must disable the * cache. * * @param enabled true to enable the animation cache, false otherwise * * @see #isAnimationCacheEnabled() * @see View#setDrawingCacheEnabled(boolean) */ public void setAnimationCacheEnabled(boolean enabled) { setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); } /** * Indicates whether this ViewGroup will always try to draw its children using their * drawing cache. By default this property is enabled. * * @return true if the animation cache is enabled, false otherwise * * @see #setAlwaysDrawnWithCacheEnabled(boolean) * @see #setChildrenDrawnWithCacheEnabled(boolean) * @see View#setDrawingCacheEnabled(boolean) */ @ViewDebug.ExportedProperty(category = "drawing") public boolean isAlwaysDrawnWithCacheEnabled() { return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; } /** * Indicates whether this ViewGroup will always try to draw its children using their * drawing cache. This property can be set to true when the cache rendering is * slightly different from the children's normal rendering. Renderings can be different, * for instance, when the cache's quality is set to low. * * When this property is disabled, the ViewGroup will use the drawing cache of its * children only when asked to. It's usually the task of subclasses to tell ViewGroup * when to start using the drawing cache and when to stop using it. * * @param always true to always draw with the drawing cache, false otherwise * * @see #isAlwaysDrawnWithCacheEnabled() * @see #setChildrenDrawnWithCacheEnabled(boolean) * @see View#setDrawingCacheEnabled(boolean) * @see View#setDrawingCacheQuality(int) */ public void setAlwaysDrawnWithCacheEnabled(boolean always) { setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); } /** * Indicates whether the ViewGroup is currently drawing its children using * their drawing cache. * * @return true if children should be drawn with their cache, false otherwise * * @see #setAlwaysDrawnWithCacheEnabled(boolean) * @see #setChildrenDrawnWithCacheEnabled(boolean) */ @ViewDebug.ExportedProperty(category = "drawing") protected boolean isChildrenDrawnWithCacheEnabled() { return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; } /** * Tells the ViewGroup to draw its children using their drawing cache. This property * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache * will be used only if it has been enabled. * * Subclasses should call this method to start and stop using the drawing cache when * they perform performance sensitive operations, like scrolling or animating. * * @param enabled true if children should be drawn with their cache, false otherwise * * @see #setAlwaysDrawnWithCacheEnabled(boolean) * @see #isChildrenDrawnWithCacheEnabled() */ protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); } /** * Indicates whether the ViewGroup is drawing its children in the order defined by * {@link #getChildDrawingOrder(int, int)}. * * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, * false otherwise * * @see #setChildrenDrawingOrderEnabled(boolean) * @see #getChildDrawingOrder(int, int) */ @ViewDebug.ExportedProperty(category = "drawing") protected boolean isChildrenDrawingOrderEnabled() { return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; } /** * Tells the ViewGroup whether to draw its children in the order defined by the method * {@link #getChildDrawingOrder(int, int)}. * * @param enabled true if the order of the children when drawing is determined by * {@link #getChildDrawingOrder(int, int)}, false otherwise * * @see #isChildrenDrawingOrderEnabled() * @see #getChildDrawingOrder(int, int) */ protected void setChildrenDrawingOrderEnabled(boolean enabled) { setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); } private boolean hasBooleanFlag(int flag) { return (mGroupFlags & flag) == flag; } private void setBooleanFlag(int flag, boolean value) { if (value) { mGroupFlags |= flag; } else { mGroupFlags &= ~flag; } } /** * Returns an integer indicating what types of drawing caches are kept in memory. * * @see #setPersistentDrawingCache(int) * @see #setAnimationCacheEnabled(boolean) * * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} * and {@link #PERSISTENT_ALL_CACHES} */ @ViewDebug.ExportedProperty(category = "drawing", mapping = { @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") }) public int getPersistentDrawingCache() { return mPersistentDrawingCache; } /** * Indicates what types of drawing caches should be kept in memory after * they have been created. * * @see #getPersistentDrawingCache() * @see #setAnimationCacheEnabled(boolean) * * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} * and {@link #PERSISTENT_ALL_CACHES} */ public void setPersistentDrawingCache(int drawingCacheToKeep) { mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; } private void setLayoutMode(int layoutMode, boolean explicitly) { mLayoutMode = layoutMode; setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); } /** * Recursively traverse the view hierarchy, resetting the layoutMode of any * descendants that had inherited a different layoutMode from a previous parent. * Recursion terminates when a descendant's mode is: *

    *
  • Undefined
  • *
  • The same as the root node's
  • *
  • A mode that had been explicitly set
  • *
      * The first two clauses are optimizations. * @param layoutModeOfRoot */ @Override void invalidateInheritedLayoutMode(int layoutModeOfRoot) { if (mLayoutMode == LAYOUT_MODE_UNDEFINED || mLayoutMode == layoutModeOfRoot || hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { return; } setLayoutMode(LAYOUT_MODE_UNDEFINED, false); // apply recursively for (int i = 0, N = getChildCount(); i < N; i++) { getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); } } /** * Returns the basis of alignment during layout operations on this ViewGroup: * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. *

      * If no layoutMode was explicitly set, either programmatically or in an XML resource, * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. * * @return the layout mode to use during layout operations * * @see #setLayoutMode(int) */ public int getLayoutMode() { if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { int inheritedLayoutMode = (mParent instanceof ViewGroup) ? ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; setLayoutMode(inheritedLayoutMode, false); } return mLayoutMode; } /** * Sets the basis of alignment during the layout of this ViewGroup. * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. * * @param layoutMode the layout mode to use during layout operations * * @see #getLayoutMode() * @attr ref android.R.styleable#ViewGroup_layoutMode */ public void setLayoutMode(int layoutMode) { if (mLayoutMode != layoutMode) { invalidateInheritedLayoutMode(layoutMode); setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); requestLayout(); } } /** * Returns a new set of layout parameters based on the supplied attributes set. * * @param attrs the attributes to build the layout parameters from * * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one * of its descendants */ public LayoutParams generateLayoutParams(AttributeSet attrs) { return new LayoutParams(getContext(), attrs); } /** * Returns a safe set of layout parameters based on the supplied layout params. * When a ViewGroup is passed a View whose layout params do not pass the test of * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method * is invoked. This method should return a new set of layout params suitable for * this ViewGroup, possibly by copying the appropriate attributes from the * specified set of layout params. * * @param p The layout parameters to convert into a suitable set of layout parameters * for this ViewGroup. * * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one * of its descendants */ protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { return p; } /** * Returns a set of default layout parameters. These parameters are requested * when the View passed to {@link #addView(View)} has no layout parameters * already set. If null is returned, an exception is thrown from addView. * * @return a set of default layout parameters or null */ protected LayoutParams generateDefaultLayoutParams() { return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); } /** * {@inheritDoc} */ @Override protected void debug(int depth) { super.debug(depth); String output; if (mFocused != null) { output = debugIndent(depth); output += "mFocused"; Log.d(VIEW_LOG_TAG, output); } if (mChildrenCount != 0) { output = debugIndent(depth); output += "{"; Log.d(VIEW_LOG_TAG, output); } int count = mChildrenCount; for (int i = 0; i < count; i++) { View child = mChildren[i]; child.debug(depth + 1); } if (mChildrenCount != 0) { output = debugIndent(depth); output += "}"; Log.d(VIEW_LOG_TAG, output); } } /** * Returns the position in the group of the specified child view. * * @param child the view for which to get the position * @return a positive integer representing the position of the view in the * group, or -1 if the view does not exist in the group */ public int indexOfChild(View child) { final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { if (children[i] == child) { return i; } } return -1; } /** * Returns the number of children in the group. * * @return a positive integer representing the number of children in * the group */ public int getChildCount() { return mChildrenCount; } /** * Returns the view at the specified position in the group. * * @param index the position at which to get the view from * @return the view at the specified position or null if the position * does not exist within the group */ //查询 public View getChildAt(int index) { if (index < 0 || index >= mChildrenCount) { return null; } return mChildren[index]; } /** * Ask all of the children of this view to measure themselves, taking into * account both the MeasureSpec requirements for this view and its padding. * We skip children that are in the GONE state The heavy lifting is done in * getChildMeasureSpec. * * @param widthMeasureSpec The width requirements for this view * @param heightMeasureSpec The height requirements for this view */ //measureChildren(int widthMeasureSpec, int heightMeasureSpec) 根据指定的高和宽来测量所有子View中显示参数 非GONE的组件 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { final int size = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < size; ++i) { final View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { measureChild(child, widthMeasureSpec, heightMeasureSpec); } } } /** * Ask one of the children of this view to measure itself, taking into * account both the MeasureSpec requirements for this view and its padding. * The heavy lifting is done in getChildMeasureSpec. * * @param child The child to measure * @param parentWidthMeasureSpec The width requirements for this view * @param parentHeightMeasureSpec The height requirements for this view */ //measureChild(View child, int parentWidthMeasureSpec,int parentHeightMeasureSpec)为子组件添加padding protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { final LayoutParams lp = child.getLayoutParams(); final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft + mPaddingRight, lp.width); final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, mPaddingTop + mPaddingBottom, lp.height); child.measure(childWidthMeasureSpec, childHeightMeasureSpec); } /** * Ask one of the children of this view to measure itself, taking into * account both the MeasureSpec requirements for this view and its padding * and margins. The child must have MarginLayoutParams The heavy lifting is * done in getChildMeasureSpec. * * @param child The child to measure * @param parentWidthMeasureSpec The width requirements for this view * @param widthUsed Extra space that has been used up by the parent * horizontally (possibly by other children of the parent) * @param parentHeightMeasureSpec The height requirements for this view * @param heightUsed Extra space that has been used up by the parent * vertically (possibly by other children of the parent) */ //measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed) 测量指定的子组件,为子组件添加padding和margin protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed) { final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin + widthUsed, lp.width); final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin + heightUsed, lp.height); child.measure(childWidthMeasureSpec, childHeightMeasureSpec); } /** * Does the hard part of measureChildren: figuring out the MeasureSpec to * pass to a particular child. This method figures out the right MeasureSpec * for one dimension (height or width) of one child view. * * The goal is to combine information from our MeasureSpec with the * LayoutParams of the child to get the best possible results. For example, * if the this view knows its size (because its MeasureSpec has a mode of * EXACTLY), and the child has indicated in its LayoutParams that it wants * to be the same size as the parent, the parent should ask the child to * layout given an exact size. * * @param spec The requirements for this view * @param padding The padding of this view for the current dimension and * margins, if applicable * @param childDimension How big the child wants to be in the current * dimension * @return a MeasureSpec integer for the child */ public static int getChildMeasureSpec(int spec, int padding, int childDimension) { int specMode = MeasureSpec.getMode(spec); int specSize = MeasureSpec.getSize(spec); int size = Math.max(0, specSize - padding); int resultSize = 0; int resultMode = 0; switch (specMode) { // Parent has imposed an exact size on us case MeasureSpec.EXACTLY: if (childDimension >= 0) { resultSize = childDimension; resultMode = MeasureSpec.EXACTLY; } else if (childDimension == LayoutParams.MATCH_PARENT) { // Child wants to be our size. So be it. resultSize = size; resultMode = MeasureSpec.EXACTLY; } else if (childDimension == LayoutParams.WRAP_CONTENT) { // Child wants to determine its own size. It can't be // bigger than us. resultSize = size; resultMode = MeasureSpec.AT_MOST; } break; // Parent has imposed a maximum size on us case MeasureSpec.AT_MOST: if (childDimension >= 0) { // Child wants a specific size... so be it resultSize = childDimension; resultMode = MeasureSpec.EXACTLY; } else if (childDimension == LayoutParams.MATCH_PARENT) { // Child wants to be our size, but our size is not fixed. // Constrain child to not be bigger than us. resultSize = size; resultMode = MeasureSpec.AT_MOST; } else if (childDimension == LayoutParams.WRAP_CONTENT) { // Child wants to determine its own size. It can't be // bigger than us. resultSize = size; resultMode = MeasureSpec.AT_MOST; } break; // Parent asked to see how big we want to be case MeasureSpec.UNSPECIFIED: if (childDimension >= 0) { // Child wants a specific size... let him have it resultSize = childDimension; resultMode = MeasureSpec.EXACTLY; } else if (childDimension == LayoutParams.MATCH_PARENT) { // Child wants to be our size... find out how big it should // be resultSize = 0; resultMode = MeasureSpec.UNSPECIFIED; } else if (childDimension == LayoutParams.WRAP_CONTENT) { // Child wants to determine its own size.... find out how // big it should be resultSize = 0; resultMode = MeasureSpec.UNSPECIFIED; } break; } return MeasureSpec.makeMeasureSpec(resultSize, resultMode); } /** * Removes any pending animations for views that have been removed. Call * this if you don't want animations for exiting views to stack up. */ public void clearDisappearingChildren() { if (mDisappearingChildren != null) { mDisappearingChildren.clear(); invalidate(); } } /** * Add a view which is removed from mChildren but still needs animation * * @param v View to add */ private void addDisappearingView(View v) { ArrayList disappearingChildren = mDisappearingChildren; if (disappearingChildren == null) { disappearingChildren = mDisappearingChildren = new ArrayList(); } disappearingChildren.add(v); } /** * Cleanup a view when its animation is done. This may mean removing it from * the list of disappearing views. * * @param view The view whose animation has finished * @param animation The animation, cannot be null */ void finishAnimatingView(final View view, Animation animation) { final ArrayList disappearingChildren = mDisappearingChildren; if (disappearingChildren != null) { if (disappearingChildren.contains(view)) { disappearingChildren.remove(view); if (view.mAttachInfo != null) { view.dispatchDetachedFromWindow(); } view.clearAnimation(); mGroupFlags |= FLAG_INVALIDATE_REQUIRED; } } if (animation != null && !animation.getFillAfter()) { view.clearAnimation(); } if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { view.onAnimationEnd(); // Should be performed by onAnimationEnd() but this avoid an infinite loop, // so we'd rather be safe than sorry view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; // Draw one more frame after the animation is done mGroupFlags |= FLAG_INVALIDATE_REQUIRED; } } /** * Utility function called by View during invalidation to determine whether a view that * is invisible or gone should still be invalidated because it is being transitioned (and * therefore still needs to be drawn). */ boolean isViewTransitioning(View view) { return (mTransitioningViews != null && mTransitioningViews.contains(view)); } /** * This method tells the ViewGroup that the given View object, which should have this * ViewGroup as its parent, * should be kept around (re-displayed when the ViewGroup draws its children) even if it * is removed from its parent. This allows animations, such as those used by * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate * the removal of views. A call to this method should always be accompanied by a later call * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, * so that the View finally gets removed. * * @param view The View object to be kept visible even if it gets removed from its parent. */ public void startViewTransition(View view) { if (view.mParent == this) { if (mTransitioningViews == null) { mTransitioningViews = new ArrayList(); } mTransitioningViews.add(view); } } /** * This method should always be called following an earlier call to * {@link #startViewTransition(View)}. The given View is finally removed from its parent * and will no longer be displayed. Note that this method does not perform the functionality * of removing a view from its parent; it just discontinues the display of a View that * has previously been removed. * * @return view The View object that has been removed but is being kept around in the visible * hierarchy by an earlier call to {@link #startViewTransition(View)}. */ public void endViewTransition(View view) { if (mTransitioningViews != null) { mTransitioningViews.remove(view); final ArrayList disappearingChildren = mDisappearingChildren; if (disappearingChildren != null && disappearingChildren.contains(view)) { disappearingChildren.remove(view); if (mVisibilityChangingChildren != null && mVisibilityChangingChildren.contains(view)) { mVisibilityChangingChildren.remove(view); } else { if (view.mAttachInfo != null) { view.dispatchDetachedFromWindow(); } if (view.mParent != null) { view.mParent = null; } } invalidate(); } } } private LayoutTransition.TransitionListener mLayoutTransitionListener = new LayoutTransition.TransitionListener() { @Override public void startTransition(LayoutTransition transition, ViewGroup container, View view, int transitionType) { // We only care about disappearing items, since we need special logic to keep // those items visible after they've been 'removed' if (transitionType == LayoutTransition.DISAPPEARING) { startViewTransition(view); } } @Override public void endTransition(LayoutTransition transition, ViewGroup container, View view, int transitionType) { if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { requestLayout(); mLayoutCalledWhileSuppressed = false; } if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { endViewTransition(view); } } }; /** * Tells this ViewGroup to suppress all layout() calls until layout * suppression is disabled with a later call to suppressLayout(false). * When layout suppression is disabled, a requestLayout() call is sent * if layout() was attempted while layout was being suppressed. * * @hide */ public void suppressLayout(boolean suppress) { mSuppressLayout = suppress; if (!suppress) { if (mLayoutCalledWhileSuppressed) { requestLayout(); mLayoutCalledWhileSuppressed = false; } } } /** * Returns whether layout calls on this container are currently being * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}. * * @return true if layout calls are currently suppressed, false otherwise. * * @hide */ public boolean isLayoutSuppressed() { return mSuppressLayout; } /** * {@inheritDoc} */ @Override public boolean gatherTransparentRegion(Region region) { // If no transparent regions requested, we are always opaque. final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; if (meOpaque && region == null) { // The caller doesn't care about the region, so stop now. return true; } super.gatherTransparentRegion(region); final View[] children = mChildren; final int count = mChildrenCount; boolean noneOfTheChildrenAreTransparent = true; for (int i = 0; i < count; i++) { final View child = children[i]; if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { if (!child.gatherTransparentRegion(region)) { noneOfTheChildrenAreTransparent = false; } } } return meOpaque || noneOfTheChildrenAreTransparent; } /** * {@inheritDoc} */ public void requestTransparentRegion(View child) { if (child != null) { child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; if (mParent != null) { mParent.requestTransparentRegion(this); } } } @Override protected boolean fitSystemWindows(Rect insets) { boolean done = super.fitSystemWindows(insets); if (!done) { final int count = mChildrenCount; final View[] children = mChildren; for (int i = 0; i < count; i++) { done = children[i].fitSystemWindows(insets); if (done) { break; } } } return done; } /** * Returns the animation listener to which layout animation events are * sent. * * @return an {@link android.view.animation.Animation.AnimationListener} */ public Animation.AnimationListener getLayoutAnimationListener() { return mAnimationListener; } @Override protected void drawableStateChanged() { super.drawableStateChanged(); if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { throw new IllegalStateException("addStateFromChildren cannot be enabled if a" + " child has duplicateParentState set to true"); } final View[] children = mChildren; final int count = mChildrenCount; for (int i = 0; i < count; i++) { final View child = children[i]; if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { child.refreshDrawableState(); } } } } @Override public void jumpDrawablesToCurrentState() { super.jumpDrawablesToCurrentState(); final View[] children = mChildren; final int count = mChildrenCount; for (int i = 0; i < count; i++) { children[i].jumpDrawablesToCurrentState(); } } @Override protected int[] onCreateDrawableState(int extraSpace) { if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { return super.onCreateDrawableState(extraSpace); } int need = 0; int n = getChildCount(); for (int i = 0; i < n; i++) { int[] childState = getChildAt(i).getDrawableState(); if (childState != null) { need += childState.length; } } int[] state = super.onCreateDrawableState(extraSpace + need); for (int i = 0; i < n; i++) { int[] childState = getChildAt(i).getDrawableState(); if (childState != null) { state = mergeDrawableStates(state, childState); } } return state; } /** * Sets whether this ViewGroup's drawable states also include * its children's drawable states. This is used, for example, to * make a group appear to be focused when its child EditText or button * is focused. */ public void setAddStatesFromChildren(boolean addsStates) { if (addsStates) { mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; } else { mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; } refreshDrawableState(); } /** * Returns whether this ViewGroup's drawable states also include * its children's drawable states. This is used, for example, to * make a group appear to be focused when its child EditText or button * is focused. */ public boolean addStatesFromChildren() { return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; } /** * If {@link #addStatesFromChildren} is true, refreshes this group's * drawable state (to include the states from its children). */ public void childDrawableStateChanged(View child) { if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { refreshDrawableState(); } } /** * Specifies the animation listener to which layout animation events must * be sent. Only * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} * and * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} * are invoked. * * @param animationListener the layout animation listener */ public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { mAnimationListener = animationListener; } /** * This method is called by LayoutTransition when there are 'changing' animations that need * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who * starts all pending transitions prior to the drawing phase in the current traversal. * * @param transition The LayoutTransition to be started on the next traversal. * * @hide */ public void requestTransitionStart(LayoutTransition transition) { ViewRootImpl viewAncestor = getViewRootImpl(); if (viewAncestor != null) { viewAncestor.requestTransitionStart(transition); } } /** * @hide */ @Override public boolean resolveRtlPropertiesIfNeeded() { final boolean result = super.resolveRtlPropertiesIfNeeded(); // We dont need to resolve the children RTL properties if nothing has changed for the parent if (result) { int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isLayoutDirectionInherited()) { child.resolveRtlPropertiesIfNeeded(); } } } return result; } /** * @hide */ @Override public boolean resolveLayoutDirection() { final boolean result = super.resolveLayoutDirection(); if (result) { int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isLayoutDirectionInherited()) { child.resolveLayoutDirection(); } } } return result; } /** * @hide */ @Override public boolean resolveTextDirection() { final boolean result = super.resolveTextDirection(); if (result) { int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isTextDirectionInherited()) { child.resolveTextDirection(); } } } return result; } /** * @hide */ @Override public boolean resolveTextAlignment() { final boolean result = super.resolveTextAlignment(); if (result) { int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isTextAlignmentInherited()) { child.resolveTextAlignment(); } } } return result; } /** * @hide */ @Override public void resolvePadding() { super.resolvePadding(); int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isLayoutDirectionInherited()) { child.resolvePadding(); } } } /** * @hide */ @Override protected void resolveDrawables() { super.resolveDrawables(); int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isLayoutDirectionInherited()) { child.resolveDrawables(); } } } /** * @hide */ @Override public void resolveLayoutParams() { super.resolveLayoutParams(); int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); child.resolveLayoutParams(); } } /** * @hide */ @Override public void resetResolvedLayoutDirection() { super.resetResolvedLayoutDirection(); int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isLayoutDirectionInherited()) { child.resetResolvedLayoutDirection(); } } } /** * @hide */ @Override public void resetResolvedTextDirection() { super.resetResolvedTextDirection(); int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isTextDirectionInherited()) { child.resetResolvedTextDirection(); } } } /** * @hide */ @Override public void resetResolvedTextAlignment() { super.resetResolvedTextAlignment(); int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isTextAlignmentInherited()) { child.resetResolvedTextAlignment(); } } } /** * @hide */ @Override public void resetResolvedPadding() { super.resetResolvedPadding(); int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isLayoutDirectionInherited()) { child.resetResolvedPadding(); } } } /** * @hide */ @Override protected void resetResolvedDrawables() { super.resetResolvedDrawables(); int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.isLayoutDirectionInherited()) { child.resetResolvedDrawables(); } } } /** * Return true if the pressed state should be delayed for children or descendants of this * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. * This prevents the pressed state from appearing when the user is actually trying to scroll * the content. * * The default implementation returns true for compatibility reasons. Subclasses that do * not scroll should generally override this method and return false. */ public boolean shouldDelayChildPressedState() { return true; } /** @hide */ protected void onSetLayoutParams(View child, LayoutParams layoutParams) { } /** * LayoutParams are used by views to tell their parents how they want to be * laid out. See * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} * for a list of all child view attributes that this class supports. * *

      * The base LayoutParams class just describes how big the view wants to be * for both width and height. For each dimension, it can specify one of: *

        *
      • FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which * means that the view wants to be as big as its parent (minus padding) *
      • WRAP_CONTENT, which means that the view wants to be just big enough * to enclose its content (plus padding) *
      • an exact number *
      * There are subclasses of LayoutParams for different subclasses of * ViewGroup. For example, AbsoluteLayout has its own subclass of * LayoutParams which adds an X and Y value.

      * *
      *

      Developer Guides

      *

      For more information about creating user interface layouts, read the * XML Layouts developer * guide.

      * * @attr ref android.R.styleable#ViewGroup_Layout_layout_height * @attr ref android.R.styleable#ViewGroup_Layout_layout_width */ public static class LayoutParams { /** * Special value for the height or width requested by a View. * FILL_PARENT means that the view wants to be as big as its parent, * minus the parent's padding, if any. This value is deprecated * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. */ @SuppressWarnings({"UnusedDeclaration"}) @Deprecated public static final int FILL_PARENT = -1; /** * Special value for the height or width requested by a View. * MATCH_PARENT means that the view wants to be as big as its parent, * minus the parent's padding, if any. Introduced in API Level 8. */ public static final int MATCH_PARENT = -1; /** * Special value for the height or width requested by a View. * WRAP_CONTENT means that the view wants to be just large enough to fit * its own internal content, taking its own padding into account. */ public static final int WRAP_CONTENT = -2; /** * Information about how wide the view wants to be. Can be one of the * constants FILL_PARENT (replaced by MATCH_PARENT , * in API Level 8) or WRAP_CONTENT. or an exact size. */ @ViewDebug.ExportedProperty(category = "layout", mapping = { @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") }) public int width; /** * Information about how tall the view wants to be. Can be one of the * constants FILL_PARENT (replaced by MATCH_PARENT , * in API Level 8) or WRAP_CONTENT. or an exact size. */ @ViewDebug.ExportedProperty(category = "layout", mapping = { @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") }) public int height; /** * Used to animate layouts. */ public LayoutAnimationController.AnimationParameters layoutAnimationParameters; /** * Creates a new set of layout parameters. The values are extracted from * the supplied attributes set and context. The XML attributes mapped * to this set of layout parameters are: * *
        *
      • layout_width: the width, either an exact value, * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by * {@link #MATCH_PARENT} in API Level 8)
      • *
      • layout_height: the height, either an exact value, * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by * {@link #MATCH_PARENT} in API Level 8)
      • *
      * * @param c the application environment * @param attrs the set of attributes from which to extract the layout * parameters' values */ public LayoutParams(Context c, AttributeSet attrs) { TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); setBaseAttributes(a, R.styleable.ViewGroup_Layout_layout_width, R.styleable.ViewGroup_Layout_layout_height); a.recycle(); } /** * Creates a new set of layout parameters with the specified width * and height. * * @param width the width, either {@link #WRAP_CONTENT}, * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in * API Level 8), or a fixed size in pixels * @param height the height, either {@link #WRAP_CONTENT}, * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in * API Level 8), or a fixed size in pixels */ public LayoutParams(int width, int height) { this.width = width; this.height = height; } /** * Copy constructor. Clones the width and height values of the source. * * @param source The layout params to copy from. */ public LayoutParams(LayoutParams source) { this.width = source.width; this.height = source.height; } /** * Used internally by MarginLayoutParams. * @hide */ LayoutParams() { } /** * Extracts the layout parameters from the supplied attributes. * * @param a the style attributes to extract the parameters from * @param widthAttr the identifier of the width attribute * @param heightAttr the identifier of the height attribute */ protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { width = a.getLayoutDimension(widthAttr, "layout_width"); height = a.getLayoutDimension(heightAttr, "layout_height"); } /** * Resolve layout parameters depending on the layout direction. Subclasses that care about * layoutDirection changes should override this method. The default implementation does * nothing. * * @param layoutDirection the direction of the layout * * {@link View#LAYOUT_DIRECTION_LTR} * {@link View#LAYOUT_DIRECTION_RTL} */ public void resolveLayoutDirection(int layoutDirection) { } /** * Returns a String representation of this set of layout parameters. * * @param output the String to prepend to the internal representation * @return a String with the following format: output + * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" * * @hide */ public String debug(String output) { return output + "ViewGroup.LayoutParams={ width=" + sizeToString(width) + ", height=" + sizeToString(height) + " }"; } /** * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. * * @param view the view that contains these layout parameters * @param canvas the canvas on which to draw * * @hide */ public void onDebugDraw(View view, Canvas canvas, Paint paint) { } /** * Converts the specified size to a readable String. * * @param size the size to convert * @return a String instance representing the supplied size * * @hide */ protected static String sizeToString(int size) { if (size == WRAP_CONTENT) { return "wrap-content"; } if (size == MATCH_PARENT) { return "match-parent"; } return String.valueOf(size); } } /** * Per-child layout information for layouts that support margins. * See * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} * for a list of all child view attributes that this class supports. */ public static class MarginLayoutParams extends ViewGroup.LayoutParams { /** * The left margin in pixels of the child. * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value * to this field. */ @ViewDebug.ExportedProperty(category = "layout") public int leftMargin; /** * The top margin in pixels of the child. * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value * to this field. */ @ViewDebug.ExportedProperty(category = "layout") public int topMargin; /** * The right margin in pixels of the child. * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value * to this field. */ @ViewDebug.ExportedProperty(category = "layout") public int rightMargin; /** * The bottom margin in pixels of the child. * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value * to this field. */ @ViewDebug.ExportedProperty(category = "layout") public int bottomMargin; /** * The start margin in pixels of the child. * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value * to this field. */ @ViewDebug.ExportedProperty(category = "layout") private int startMargin = DEFAULT_MARGIN_RELATIVE; /** * The end margin in pixels of the child. * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value * to this field. */ @ViewDebug.ExportedProperty(category = "layout") private int endMargin = DEFAULT_MARGIN_RELATIVE; /** * The default start and end margin. * @hide */ public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; /** * Bit 0: layout direction * Bit 1: layout direction * Bit 2: left margin undefined * Bit 3: right margin undefined * Bit 4: is RTL compatibility mode * Bit 5: need resolution * * Bit 6 to 7 not used * * @hide */ @ViewDebug.ExportedProperty(category = "layout", flagMapping = { @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") }) byte mMarginFlags; private static final int LAYOUT_DIRECTION_MASK = 0x00000003; private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; private static final int NEED_RESOLUTION_MASK = 0x00000020; private static final int DEFAULT_MARGIN_RESOLVED = 0; private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; /** * Creates a new set of layout parameters. The values are extracted from * the supplied attributes set and context. * * @param c the application environment * @param attrs the set of attributes from which to extract the layout * parameters' values */ public MarginLayoutParams(Context c, AttributeSet attrs) { super(); TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); setBaseAttributes(a, R.styleable.ViewGroup_MarginLayout_layout_width, R.styleable.ViewGroup_MarginLayout_layout_height); int margin = a.getDimensionPixelSize( com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); if (margin >= 0) { leftMargin = margin; topMargin = margin; rightMargin= margin; bottomMargin = margin; } else { leftMargin = a.getDimensionPixelSize( R.styleable.ViewGroup_MarginLayout_layout_marginLeft, UNDEFINED_MARGIN); if (leftMargin == UNDEFINED_MARGIN) { mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; leftMargin = DEFAULT_MARGIN_RESOLVED; } rightMargin = a.getDimensionPixelSize( R.styleable.ViewGroup_MarginLayout_layout_marginRight, UNDEFINED_MARGIN); if (rightMargin == UNDEFINED_MARGIN) { mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; rightMargin = DEFAULT_MARGIN_RESOLVED; } topMargin = a.getDimensionPixelSize( R.styleable.ViewGroup_MarginLayout_layout_marginTop, DEFAULT_MARGIN_RESOLVED); bottomMargin = a.getDimensionPixelSize( R.styleable.ViewGroup_MarginLayout_layout_marginBottom, DEFAULT_MARGIN_RESOLVED); startMargin = a.getDimensionPixelSize( R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_MARGIN_RELATIVE); endMargin = a.getDimensionPixelSize( R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_MARGIN_RELATIVE); if (isMarginRelative()) { mMarginFlags |= NEED_RESOLUTION_MASK; } } final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; } // Layout direction is LTR by default mMarginFlags |= LAYOUT_DIRECTION_LTR; a.recycle(); } /** * {@inheritDoc} */ public MarginLayoutParams(int width, int height) { super(width, height); mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; mMarginFlags &= ~NEED_RESOLUTION_MASK; mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; } /** * Copy constructor. Clones the width, height and margin values of the source. * * @param source The layout params to copy from. */ public MarginLayoutParams(MarginLayoutParams source) { this.width = source.width; this.height = source.height; this.leftMargin = source.leftMargin; this.topMargin = source.topMargin; this.rightMargin = source.rightMargin; this.bottomMargin = source.bottomMargin; this.startMargin = source.startMargin; this.endMargin = source.endMargin; this.mMarginFlags = source.mMarginFlags; } /** * {@inheritDoc} */ public MarginLayoutParams(LayoutParams source) { super(source); mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; mMarginFlags &= ~NEED_RESOLUTION_MASK; mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; } /** * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs * to be done so that the new margins are taken into account. Left and right margins may be * overriden by {@link android.view.View#requestLayout()} depending on layout direction. * * @param left the left margin size * @param top the top margin size * @param right the right margin size * @param bottom the bottom margin size * * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom */ public void setMargins(int left, int top, int right, int bottom) { leftMargin = left; topMargin = top; rightMargin = right; bottomMargin = bottom; mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; if (isMarginRelative()) { mMarginFlags |= NEED_RESOLUTION_MASK; } else { mMarginFlags &= ~NEED_RESOLUTION_MASK; } } /** * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} * needs to be done so that the new relative margins are taken into account. Left and right * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout * direction. * * @param start the start margin size * @param top the top margin size * @param end the right margin size * @param bottom the bottom margin size * * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom * * @hide */ public void setMarginsRelative(int start, int top, int end, int bottom) { startMargin = start; topMargin = top; endMargin = end; bottomMargin = bottom; mMarginFlags |= NEED_RESOLUTION_MASK; } /** * Sets the relative start margin. * * @param start the start margin size * * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart */ public void setMarginStart(int start) { startMargin = start; mMarginFlags |= NEED_RESOLUTION_MASK; } /** * Returns the start margin in pixels. * * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart * * @return the start margin in pixels. */ public int getMarginStart() { if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { doResolveMargins(); } switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { case View.LAYOUT_DIRECTION_RTL: return rightMargin; case View.LAYOUT_DIRECTION_LTR: default: return leftMargin; } } /** * Sets the relative end margin. * * @param end the end margin size * * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd */ public void setMarginEnd(int end) { endMargin = end; mMarginFlags |= NEED_RESOLUTION_MASK; } /** * Returns the end margin in pixels. * * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd * * @return the end margin in pixels. */ public int getMarginEnd() { if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { doResolveMargins(); } switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { case View.LAYOUT_DIRECTION_RTL: return leftMargin; case View.LAYOUT_DIRECTION_LTR: default: return rightMargin; } } /** * Check if margins are relative. * * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd * * @return true if either marginStart or marginEnd has been set. */ public boolean isMarginRelative() { return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); } /** * Set the layout direction * @param layoutDirection the layout direction. * Should be either {@link View#LAYOUT_DIRECTION_LTR} * or {@link View#LAYOUT_DIRECTION_RTL}. */ public void setLayoutDirection(int layoutDirection) { if (layoutDirection != View.LAYOUT_DIRECTION_LTR && layoutDirection != View.LAYOUT_DIRECTION_RTL) return; if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { mMarginFlags &= ~LAYOUT_DIRECTION_MASK; mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); if (isMarginRelative()) { mMarginFlags |= NEED_RESOLUTION_MASK; } else { mMarginFlags &= ~NEED_RESOLUTION_MASK; } } } /** * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or * {@link View#LAYOUT_DIRECTION_RTL}. * * @return the layout direction. */ public int getLayoutDirection() { return (mMarginFlags & LAYOUT_DIRECTION_MASK); } /** * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins * may be overridden depending on layout direction. */ @Override public void resolveLayoutDirection(int layoutDirection) { setLayoutDirection(layoutDirection); // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything // Will use the left and right margins if no relative margin is defined. if (!isMarginRelative() || (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; // Proceed with resolution doResolveMargins(); } private void doResolveMargins() { if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { // if left or right margins are not defined and if we have some start or end margin // defined then use those start and end margins. if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK && startMargin > DEFAULT_MARGIN_RELATIVE) { leftMargin = startMargin; } if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK && endMargin > DEFAULT_MARGIN_RELATIVE) { rightMargin = endMargin; } } else { // We have some relative margins (either the start one or the end one or both). So use // them and override what has been defined for left and right margins. If either start // or end margin is not defined, just set it to default "0". switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { case View.LAYOUT_DIRECTION_RTL: leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? endMargin : DEFAULT_MARGIN_RESOLVED; rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? startMargin : DEFAULT_MARGIN_RESOLVED; break; case View.LAYOUT_DIRECTION_LTR: default: leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? startMargin : DEFAULT_MARGIN_RESOLVED; rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? endMargin : DEFAULT_MARGIN_RESOLVED; break; } } mMarginFlags &= ~NEED_RESOLUTION_MASK; } /** * @hide */ public boolean isLayoutRtl() { return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); } /** * @hide */ @Override public void onDebugDraw(View view, Canvas canvas, Paint paint) { Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; fillDifference(canvas, view.getLeft() + oi.left, view.getTop() + oi.top, view.getRight() - oi.right, view.getBottom() - oi.bottom, leftMargin, topMargin, rightMargin, bottomMargin, paint); } } /* Describes a touched view and the ids of the pointers that it has captured. * * This code assumes that pointer ids are always in the range 0..31 such that * it can use a bitfield to track which pointer ids are present. * As it happens, the lower layers of the input dispatch pipeline also use the * same trick so the assumption should be safe here... */ private static final class TouchTarget { private static final int MAX_RECYCLED = 32; private static final Object sRecycleLock = new Object[0]; private static TouchTarget sRecycleBin; private static int sRecycledCount; public static final int ALL_POINTER_IDS = -1; // all ones // The touched child view. public View child; // The combined bit mask of pointer ids for all pointers captured by the target. public int pointerIdBits; // The next target in the target list. public TouchTarget next; private TouchTarget() { } public static TouchTarget obtain(View child, int pointerIdBits) { final TouchTarget target; synchronized (sRecycleLock) { if (sRecycleBin == null) { target = new TouchTarget(); } else { target = sRecycleBin; sRecycleBin = target.next; sRecycledCount--; target.next = null; } } target.child = child; target.pointerIdBits = pointerIdBits; return target; } public void recycle() { synchronized (sRecycleLock) { if (sRecycledCount < MAX_RECYCLED) { next = sRecycleBin; sRecycleBin = this; sRecycledCount += 1; } else { next = null; } child = null; } } } /* Describes a hovered view. */ private static final class HoverTarget { private static final int MAX_RECYCLED = 32; private static final Object sRecycleLock = new Object[0]; private static HoverTarget sRecycleBin; private static int sRecycledCount; // The hovered child view. public View child; // The next target in the target list. public HoverTarget next; private HoverTarget() { } public static HoverTarget obtain(View child) { final HoverTarget target; synchronized (sRecycleLock) { if (sRecycleBin == null) { target = new HoverTarget(); } else { target = sRecycleBin; sRecycleBin = target.next; sRecycledCount--; target.next = null; } } target.child = child; return target; } public void recycle() { synchronized (sRecycleLock) { if (sRecycledCount < MAX_RECYCLED) { next = sRecycleBin; sRecycleBin = this; sRecycledCount += 1; } else { next = null; } child = null; } } } /** * Pooled class that orderes the children of a ViewGroup from start * to end based on how they are laid out and the layout direction. */ static class ChildListForAccessibility { private static final int MAX_POOL_SIZE = 32; private static final SynchronizedPool sPool = new SynchronizedPool(MAX_POOL_SIZE); private final ArrayList mChildren = new ArrayList(); private final ArrayList mHolders = new ArrayList(); public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { ChildListForAccessibility list = sPool.acquire(); if (list == null) { list = new ChildListForAccessibility(); } list.init(parent, sort); return list; } public void recycle() { clear(); sPool.release(this); } public int getChildCount() { return mChildren.size(); } public View getChildAt(int index) { return mChildren.get(index); } public int getChildIndex(View child) { return mChildren.indexOf(child); } private void init(ViewGroup parent, boolean sort) { ArrayList children = mChildren; final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { View child = parent.getChildAt(i); children.add(child); } if (sort) { ArrayList holders = mHolders; for (int i = 0; i < childCount; i++) { View child = children.get(i); ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); holders.add(holder); } Collections.sort(holders); for (int i = 0; i < childCount; i++) { ViewLocationHolder holder = holders.get(i); children.set(i, holder.mView); holder.recycle(); } holders.clear(); } } private void clear() { mChildren.clear(); } } /** * Pooled class that holds a View and its location with respect to * a specified root. This enables sorting of views based on their * coordinates without recomputing the position relative to the root * on every comparison. */ static class ViewLocationHolder implements Comparable { private static final int MAX_POOL_SIZE = 32; private static final SynchronizedPool sPool = new SynchronizedPool(MAX_POOL_SIZE); private final Rect mLocation = new Rect(); public View mView; private int mLayoutDirection; public static ViewLocationHolder obtain(ViewGroup root, View view) { ViewLocationHolder holder = sPool.acquire(); if (holder == null) { holder = new ViewLocationHolder(); } holder.init(root, view); return holder; } public void recycle() { clear(); sPool.release(this); } @Override public int compareTo(ViewLocationHolder another) { // This instance is greater than an invalid argument. if (another == null) { return 1; } if (getClass() != another.getClass()) { return 1; } // First is above second. if (mLocation.bottom - another.mLocation.top <= 0) { return -1; } // First is below second. if (mLocation.top - another.mLocation.bottom >= 0) { return 1; } // LTR if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { final int leftDifference = mLocation.left - another.mLocation.left; // First more to the left than second. if (leftDifference != 0) { return leftDifference; } } else { // RTL final int rightDifference = mLocation.right - another.mLocation.right; // First more to the right than second. if (rightDifference != 0) { return -rightDifference; } } // Break tie by top. final int topDiference = mLocation.top - another.mLocation.top; if (topDiference != 0) { return topDiference; } // Break tie by height. final int heightDiference = mLocation.height() - another.mLocation.height(); if (heightDiference != 0) { return -heightDiference; } // Break tie by width. final int widthDiference = mLocation.width() - another.mLocation.width(); if (widthDiference != 0) { return -widthDiference; } // Just break the tie somehow. The accessibliity ids are unique // and stable, hence this is deterministic tie breaking. return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); } private void init(ViewGroup root, View view) { Rect viewLocation = mLocation; view.getDrawingRect(viewLocation); root.offsetDescendantRectToMyCoords(view, viewLocation); mView = view; mLayoutDirection = root.getLayoutDirection(); } private void clear() { mView = null; mLocation.set(0, 0, 0, 0); } } private static Paint getDebugPaint() { if (sDebugPaint == null) { sDebugPaint = new Paint(); sDebugPaint.setAntiAlias(false); } return sDebugPaint; } private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { if (sDebugLines== null) { // TODO: This won't work with multiple UI threads in a single process sDebugLines = new float[16]; } sDebugLines[0] = x1; sDebugLines[1] = y1; sDebugLines[2] = x2; sDebugLines[3] = y1; sDebugLines[4] = x2; sDebugLines[5] = y1; sDebugLines[6] = x2; sDebugLines[7] = y2; sDebugLines[8] = x2; sDebugLines[9] = y2; sDebugLines[10] = x1; sDebugLines[11] = y2; sDebugLines[12] = x1; sDebugLines[13] = y2; sDebugLines[14] = x1; sDebugLines[15] = y1; canvas.drawLines(sDebugLines, paint); }}
语言表达能力一般,请见谅。

View.java:

/* * Copyright (C) 2006 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package android.view;import android.content.ClipData;import android.content.Context;import android.content.res.Configuration;import android.content.res.Resources;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Camera;import android.graphics.Canvas;import android.graphics.Insets;import android.graphics.Interpolator;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PixelFormat;import android.graphics.Point;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Region;import android.graphics.Shader;import android.graphics.drawable.ColorDrawable;import android.graphics.drawable.Drawable;import android.hardware.display.DisplayManagerGlobal;import android.os.Bundle;import android.os.Handler;import android.os.IBinder;import android.os.Parcel;import android.os.Parcelable;import android.os.RemoteException;import android.os.SystemClock;import android.os.SystemProperties;import android.text.TextUtils;import android.util.AttributeSet;import android.util.FloatProperty;import android.util.LayoutDirection;import android.util.Log;import android.util.LongSparseLongArray;import android.util.Pools.SynchronizedPool;import android.util.Property;import android.util.SparseArray;import android.util.SuperNotCalledException;import android.util.TypedValue;import android.view.ContextMenu.ContextMenuInfo;import android.view.AccessibilityIterators.TextSegmentIterator;import android.view.AccessibilityIterators.CharacterTextSegmentIterator;import android.view.AccessibilityIterators.WordTextSegmentIterator;import android.view.AccessibilityIterators.ParagraphTextSegmentIterator;import android.view.accessibility.AccessibilityEvent;import android.view.accessibility.AccessibilityEventSource;import android.view.accessibility.AccessibilityManager;import android.view.accessibility.AccessibilityNodeInfo;import android.view.accessibility.AccessibilityNodeProvider;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.view.animation.Transformation;import android.view.inputmethod.EditorInfo;import android.view.inputmethod.InputConnection;import android.view.inputmethod.InputMethodManager;import android.widget.ScrollBarDrawable;import static android.os.Build.VERSION_CODES.*;import static java.lang.Math.max;import com.android.internal.R;import com.android.internal.util.Predicate;import com.android.internal.view.menu.MenuBuilder;import com.google.android.collect.Lists;import com.google.android.collect.Maps;import java.lang.ref.WeakReference;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.lang.reflect.Modifier;import java.util.ArrayList;import java.util.Arrays;import java.util.Collections;import java.util.HashMap;import java.util.Locale;import java.util.concurrent.CopyOnWriteArrayList;import java.util.concurrent.atomic.AtomicInteger;/** * 

* This class represents the basic building block for user interface components. A View * occupies a rectangular area on the screen and is responsible for drawing and * event handling. View is the base class for widgets, which are * used to create interactive UI components (buttons, text fields, etc.). The * {@link android.view.ViewGroup} subclass is the base class for layouts, which * are invisible containers that hold other Views (or other ViewGroups) and define * their layout properties. *

* *
*

Developer Guides

*

For information about using this class to develop your application's user interface, * read the User Interface developer guide. *

* * *

Using Views

*

* All of the views in a window are arranged in a single tree. You can add views * either from code or by specifying a tree of views in one or more XML layout * files. There are many specialized subclasses of views that act as controls or * are capable of displaying text, images, or other content. *

*

* Once you have created a tree of views, there are typically a few types of * common operations you may wish to perform: *

    *
  • Set properties: for example setting the text of a * {@link android.widget.TextView}. The available properties and the methods * that set them will vary among the different subclasses of views. Note that * properties that are known at build time can be set in the XML layout * files.
  • *
  • Set focus: The framework will handled moving focus in * response to user input. To force focus to a specific view, call * {@link #requestFocus}.
  • *
  • Set up listeners: Views allow clients to set listeners * that will be notified when something interesting happens to the view. For * example, all views will let you set a listener to be notified when the view * gains or loses focus. You can register such a listener using * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. * Other view subclasses offer more specialized listeners. For example, a Button * exposes a listener to notify clients when the button is clicked.
  • *
  • Set visibility: You can hide or show views using * {@link #setVisibility(int)}.
  • *
*

*

* Note: The Android framework is responsible for measuring, laying out and * drawing views. You should not call methods that perform these actions on * views yourself unless you are actually implementing a * {@link android.view.ViewGroup}. *

* * *

Implementing a Custom View

* *

* To implement a custom view, you will usually begin by providing overrides for * some of the standard methods that the framework calls on all views. You do * not need to override all of these methods. In fact, you can start by just * overriding {@link #onDraw(android.graphics.Canvas)}. *

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Category Methods Description
CreationConstructorsThere is a form of the constructor that are called when the view * is created from code and a form that is called when the view is * inflated from a layout file. The second form should parse and apply * any attributes defined in the layout file. *
{@link #onFinishInflate()}Called after a view and all of its children has been inflated * from XML.
Layout{@link #onMeasure(int, int)}Called to determine the size requirements for this view and all * of its children. *
{@link #onLayout(boolean, int, int, int, int)}Called when this view should assign a size and position to all * of its children. *
{@link #onSizeChanged(int, int, int, int)}Called when the size of this view has changed. *
Drawing{@link #onDraw(android.graphics.Canvas)}Called when the view should render its content. *
Event processing{@link #onKeyDown(int, KeyEvent)}Called when a new hardware key event occurs. *
{@link #onKeyUp(int, KeyEvent)}Called when a hardware key up event occurs. *
{@link #onTrackballEvent(MotionEvent)}Called when a trackball motion event occurs. *
{@link #onTouchEvent(MotionEvent)}Called when a touch screen motion event occurs. *
Focus{@link #onFocusChanged(boolean, int, android.graphics.Rect)}Called when the view gains or loses focus. *
{@link #onWindowFocusChanged(boolean)}Called when the window containing the view gains or loses focus. *
Attaching{@link #onAttachedToWindow()}Called when the view is attached to a window. *
{@link #onDetachedFromWindow}Called when the view is detached from its window. *
{@link #onWindowVisibilityChanged(int)}Called when the visibility of the window containing the view * has changed. *
*

* * *

IDs

* Views may have an integer id associated with them. These ids are typically * assigned in the layout XML files, and are used to find specific views within * the view tree. A common pattern is to: *
    *
  • Define a Button in the layout file and assign it a unique ID. *
     * 
  • *
  • From the onCreate method of an Activity, find the Button *
     *      Button myButton = (Button) findViewById(R.id.my_button); * 
  • *
*

* View IDs need not be unique throughout the tree, but it is good practice to * ensure that they are at least unique within the part of the tree you are * searching. *

* * *

Position

*

* The geometry of a view is that of a rectangle. A view has a location, * expressed as a pair of left and top coordinates, and * two dimensions, expressed as a width and a height. The unit for location * and dimensions is the pixel. *

* *

* It is possible to retrieve the location of a view by invoking the methods * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, * coordinate of the rectangle representing the view. The latter returns the * top, or Y, coordinate of the rectangle representing the view. These methods * both return the location of the view relative to its parent. For instance, * when getLeft() returns 20, that means the view is located 20 pixels to the * right of the left edge of its direct parent. *

* *

* In addition, several convenience methods are offered to avoid unnecessary * computations, namely {@link #getRight()} and {@link #getBottom()}. * These methods return the coordinates of the right and bottom edges of the * rectangle representing the view. For instance, calling {@link #getRight()} * is similar to the following computation: getLeft() + getWidth() * (see Size for more information about the width.) *

* * *

Size, padding and margins

*

* The size of a view is expressed with a width and a height. A view actually * possess two pairs of width and height values. *

* *

* The first pair is known as measured width and * measured height. These dimensions define how big a view wants to be * within its parent (see Layout for more details.) The * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} * and {@link #getMeasuredHeight()}. *

* *

* The second pair is simply known as width and height, or * sometimes drawing width and drawing height. These * dimensions define the actual size of the view on screen, at drawing time and * after layout. These values may, but do not have to, be different from the * measured width and height. The width and height can be obtained by calling * {@link #getWidth()} and {@link #getHeight()}. *

* *

* To measure its dimensions, a view takes into account its padding. The padding * is expressed in pixels for the left, top, right and bottom parts of the view. * Padding can be used to offset the content of the view by a specific amount of * pixels. For instance, a left padding of 2 will push the view's content by * 2 pixels to the right of the left edge. Padding can be set using the * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, * {@link #getPaddingEnd()}. *

* *

* Even though a view can define a padding, it does not provide any support for * margins. However, view groups provide such a support. Refer to * {@link android.view.ViewGroup} and * {@link android.view.ViewGroup.MarginLayoutParams} for further information. *

* * *

Layout

*

* Layout is a two pass process: a measure pass and a layout pass. The measuring * pass is implemented in {@link #measure(int, int)} and is a top-down traversal * of the view tree. Each view pushes dimension specifications down the tree * during the recursion. At the end of the measure pass, every view has stored * its measurements. The second pass happens in * {@link #layout(int,int,int,int)} and is also top-down. During * this pass each parent is responsible for positioning all of its children * using the sizes computed in the measure pass. *

* *

* When a view's measure() method returns, its {@link #getMeasuredWidth()} and * {@link #getMeasuredHeight()} values must be set, along with those for all of * that view's descendants. A view's measured width and measured height values * must respect the constraints imposed by the view's parents. This guarantees * that at the end of the measure pass, all parents accept all of their * children's measurements. A parent view may call measure() more than once on * its children. For example, the parent may measure each child once with * unspecified dimensions to find out how big they want to be, then call * measure() on them again with actual numbers if the sum of all the children's * unconstrained sizes is too big or too small. *

* *

* The measure pass uses two classes to communicate dimensions. The * {@link MeasureSpec} class is used by views to tell their parents how they * want to be measured and positioned. The base LayoutParams class just * describes how big the view wants to be for both width and height. For each * dimension, it can specify one of: *

    *
  • an exact number *
  • MATCH_PARENT, which means the view wants to be as big as its parent * (minus padding) *
  • WRAP_CONTENT, which means that the view wants to be just big enough to * enclose its content (plus padding). *
* There are subclasses of LayoutParams for different subclasses of ViewGroup. * For example, AbsoluteLayout has its own subclass of LayoutParams which adds * an X and Y value. *

* *

* MeasureSpecs are used to push requirements down the tree from parent to * child. A MeasureSpec can be in one of three modes: *

    *
  • UNSPECIFIED: This is used by a parent to determine the desired dimension * of a child view. For example, a LinearLayout may call measure() on its child * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how * tall the child view wants to be given a width of 240 pixels. *
  • EXACTLY: This is used by the parent to impose an exact size on the * child. The child must use this size, and guarantee that all of its * descendants will fit within this size. *
  • AT_MOST: This is used by the parent to impose a maximum size on the * child. The child must gurantee that it and all of its descendants will fit * within this size. *
*

* *

* To intiate a layout, call {@link #requestLayout}. This method is typically * called by a view on itself when it believes that is can no longer fit within * its current bounds. *

* * *

Drawing

*

* Drawing is handled by walking the tree and rendering each view that * intersects the invalid region. Because the tree is traversed in-order, * this means that parents will draw before (i.e., behind) their children, with * siblings drawn in the order they appear in the tree. * If you set a background drawable for a View, then the View will draw it for you * before calling back to its onDraw() method. *

* *

* Note that the framework will not draw views that are not in the invalid region. *

* *

* To force a view to draw, call {@link #invalidate()}. *

* * *

Event Handling and Threading

*

* The basic cycle of a view is as follows: *

    *
  1. An event comes in and is dispatched to the appropriate view. The view * handles the event and notifies any listeners.
  2. *
  3. If in the course of processing the event, the view's bounds may need * to be changed, the view will call {@link #requestLayout()}.
  4. *
  5. Similarly, if in the course of processing the event the view's appearance * may need to be changed, the view will call {@link #invalidate()}.
  6. *
  7. If either {@link #requestLayout()} or {@link #invalidate()} were called, * the framework will take care of measuring, laying out, and drawing the tree * as appropriate.
  8. *
*

* *

Note: The entire view tree is single threaded. You must always be on * the UI thread when calling any method on any view. * If you are doing work on other threads and want to update the state of a view * from that thread, you should use a {@link Handler}. *

* * *

Focus Handling

*

* The framework will handle routine focus movement in response to user input. * This includes changing the focus as views are removed or hidden, or as new * views become available. Views indicate their willingness to take focus * through the {@link #isFocusable} method. To change whether a view can take * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} * and can change this via {@link #setFocusableInTouchMode(boolean)}. *

*

* Focus movement is based on an algorithm which finds the nearest neighbor in a * given direction. In rare cases, the default algorithm may not match the * intended behavior of the developer. In these situations, you can provide * explicit overrides by using these XML attributes in the layout file: *

 * nextFocusDown * nextFocusLeft * nextFocusRight * nextFocusUp * 
*

* * *

* To get a particular view to take focus, call {@link #requestFocus()}. *

* * *

Touch Mode

*

* When a user is navigating a user interface via directional keys such as a D-pad, it is * necessary to give focus to actionable items such as buttons so the user can see * what will take input. If the device has touch capabilities, however, and the user * begins interacting with the interface by touching it, it is no longer necessary to * always highlight, or give focus to, a particular view. This motivates a mode * for interaction named 'touch mode'. *

*

* For a touch capable device, once the user touches the screen, the device * will enter touch mode. From this point onward, only views for which * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. * Other views that are touchable, like buttons, will not take focus when touched; they will * only fire the on click listeners. *

*

* Any time a user hits a directional key, such as a D-pad direction, the view device will * exit touch mode, and find a view to take focus, so that the user may resume interacting * with the user interface without touching the screen again. *

*

* The touch mode state is maintained across {@link android.app.Activity}s. Call * {@link #isInTouchMode} to see whether the device is currently in touch mode. *

* * *

Scrolling

*

* The framework provides basic support for views that wish to internally * scroll their content. This includes keeping track of the X and Y scroll * offset as well as mechanisms for drawing scrollbars. See * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and * {@link #awakenScrollBars()} for more details. *

* * *

Tags

*

* Unlike IDs, tags are not used to identify views. Tags are essentially an * extra piece of information that can be associated with a view. They are most * often used as a convenience to store data related to views in the views * themselves rather than by putting them in a separate structure. *

* * *

Properties

*

* The View class exposes an {@link #ALPHA} property, as well as several transform-related * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are * available both in the {@link Property} form as well as in similarly-named setter/getter * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can * be used to set persistent state associated with these rendering-related properties on the view. * The properties and methods can also be used in conjunction with * {@link android.animation.Animator Animator}-based animations, described more in the * Animation section. *

* * *

Animation

*

* Starting with Android 3.0, the preferred way of animating views is to use the * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class * makes animating these View properties particularly easy and efficient. *

*

* Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. * You can attach an {@link Animation} object to a view using * {@link #setAnimation(Animation)} or * {@link #startAnimation(Animation)}. The animation can alter the scale, * rotation, translation and alpha of a view over time. If the animation is * attached to a view that has children, the animation will affect the entire * subtree rooted by that node. When an animation is started, the framework will * take care of redrawing the appropriate views until the animation completes. *

* * *

Security

*

* Sometimes it is essential that an application be able to verify that an action * is being performed with the full knowledge and consent of the user, such as * granting a permission request, making a purchase or clicking on an advertisement. * Unfortunately, a malicious application could try to spoof the user into * performing these actions, unaware, by concealing the intended purpose of the view. * As a remedy, the framework offers a touch filtering mechanism that can be used to * improve the security of views that provide access to sensitive functionality. *

* To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework * will discard touches that are received whenever the view's window is obscured by * another visible window. As a result, the view will not receive touches whenever a * toast, dialog or other window appears above the view's window. *

* For more fine-grained control over security, consider overriding the * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. *

* * @attr ref android.R.styleable#View_alpha * @attr ref android.R.styleable#View_background * @attr ref android.R.styleable#View_clickable * @attr ref android.R.styleable#View_contentDescription * @attr ref android.R.styleable#View_drawingCacheQuality * @attr ref android.R.styleable#View_duplicateParentState * @attr ref android.R.styleable#View_id * @attr ref android.R.styleable#View_requiresFadingEdge * @attr ref android.R.styleable#View_fadeScrollbars * @attr ref android.R.styleable#View_fadingEdgeLength * @attr ref android.R.styleable#View_filterTouchesWhenObscured * @attr ref android.R.styleable#View_fitsSystemWindows * @attr ref android.R.styleable#View_isScrollContainer * @attr ref android.R.styleable#View_focusable * @attr ref android.R.styleable#View_focusableInTouchMode * @attr ref android.R.styleable#View_hapticFeedbackEnabled * @attr ref android.R.styleable#View_keepScreenOn * @attr ref android.R.styleable#View_layerType * @attr ref android.R.styleable#View_layoutDirection * @attr ref android.R.styleable#View_longClickable * @attr ref android.R.styleable#View_minHeight * @attr ref android.R.styleable#View_minWidth * @attr ref android.R.styleable#View_nextFocusDown * @attr ref android.R.styleable#View_nextFocusLeft * @attr ref android.R.styleable#View_nextFocusRight * @attr ref android.R.styleable#View_nextFocusUp * @attr ref android.R.styleable#View_onClick * @attr ref android.R.styleable#View_padding * @attr ref android.R.styleable#View_paddingBottom * @attr ref android.R.styleable#View_paddingLeft * @attr ref android.R.styleable#View_paddingRight * @attr ref android.R.styleable#View_paddingTop * @attr ref android.R.styleable#View_paddingStart * @attr ref android.R.styleable#View_paddingEnd * @attr ref android.R.styleable#View_saveEnabled * @attr ref android.R.styleable#View_rotation * @attr ref android.R.styleable#View_rotationX * @attr ref android.R.styleable#View_rotationY * @attr ref android.R.styleable#View_scaleX * @attr ref android.R.styleable#View_scaleY * @attr ref android.R.styleable#View_scrollX * @attr ref android.R.styleable#View_scrollY * @attr ref android.R.styleable#View_scrollbarSize * @attr ref android.R.styleable#View_scrollbarStyle * @attr ref android.R.styleable#View_scrollbars * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade * @attr ref android.R.styleable#View_scrollbarFadeDuration * @attr ref android.R.styleable#View_scrollbarTrackHorizontal * @attr ref android.R.styleable#View_scrollbarThumbHorizontal * @attr ref android.R.styleable#View_scrollbarThumbVertical * @attr ref android.R.styleable#View_scrollbarTrackVertical * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack * @attr ref android.R.styleable#View_soundEffectsEnabled * @attr ref android.R.styleable#View_tag * @attr ref android.R.styleable#View_textAlignment * @attr ref android.R.styleable#View_textDirection * @attr ref android.R.styleable#View_transformPivotX * @attr ref android.R.styleable#View_transformPivotY * @attr ref android.R.styleable#View_translationX * @attr ref android.R.styleable#View_translationY * @attr ref android.R.styleable#View_visibility * * @see android.view.ViewGroup */public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { private static final boolean DBG = false; /** * The logging tag used by this class with android.util.Log. */ protected static final String VIEW_LOG_TAG = "View"; /** * When set to true, apps will draw debugging information about their layouts. * * @hide */ public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; /** * Used to mark a View that has no ID. */ public static final int NO_ID = -1; /** * Signals that compatibility booleans have been initialized according to * target SDK versions. */ private static boolean sCompatibilityDone = false; /** * Use the old (broken) way of building MeasureSpecs. */ private static boolean sUseBrokenMakeMeasureSpec = false; /** * Ignore any optimizations using the measure cache. */ private static boolean sIgnoreMeasureCache = false; /** * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when * calling setFlags. */ private static final int NOT_FOCUSABLE = 0x00000000; /** * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling * setFlags. */ private static final int FOCUSABLE = 0x00000001; /** * Mask for use with setFlags indicating bits used for focus. */ private static final int FOCUSABLE_MASK = 0x00000001; /** * This view will adjust its padding to fit sytem windows (e.g. status bar) */ private static final int FITS_SYSTEM_WINDOWS = 0x00000002; /** * This view is visible. * Use with {@link #setVisibility} and {@code * android:visibility}. */ public static final int VISIBLE = 0x00000000; /** * This view is invisible, but it still takes up space for layout purposes. * Use with {@link #setVisibility} and {@code * android:visibility}. */ public static final int INVISIBLE = 0x00000004; /** * This view is invisible, and it doesn't take any space for layout * purposes. Use with {@link #setVisibility} and {@code * android:visibility}. */ public static final int GONE = 0x00000008; /** * Mask for use with setFlags indicating bits used for visibility. * {@hide} */ static final int VISIBILITY_MASK = 0x0000000C; private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; /** * This view is enabled. Interpretation varies by subclass. * Use with ENABLED_MASK when calling setFlags. * {@hide} */ static final int ENABLED = 0x00000000; /** * This view is disabled. Interpretation varies by subclass. * Use with ENABLED_MASK when calling setFlags. * {@hide} */ static final int DISABLED = 0x00000020; /** * Mask for use with setFlags indicating bits used for indicating whether * this view is enabled * {@hide} */ static final int ENABLED_MASK = 0x00000020; /** * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be * called and further optimizations will be performed. It is okay to have * this flag set and a background. Use with DRAW_MASK when calling setFlags. * {@hide} */ static final int WILL_NOT_DRAW = 0x00000080; /** * Mask for use with setFlags indicating bits used for indicating whether * this view is will draw * {@hide} */ static final int DRAW_MASK = 0x00000080; /** *

This view doesn't show scrollbars.

* {@hide} */ static final int SCROLLBARS_NONE = 0x00000000; /** *

This view shows horizontal scrollbars.

* {@hide} */ static final int SCROLLBARS_HORIZONTAL = 0x00000100; /** *

This view shows vertical scrollbars.

* {@hide} */ static final int SCROLLBARS_VERTICAL = 0x00000200; /** *

Mask for use with setFlags indicating bits used for indicating which * scrollbars are enabled.

* {@hide} */ static final int SCROLLBARS_MASK = 0x00000300; /** * Indicates that the view should filter touches when its window is obscured. * Refer to the class comments for more information about this security feature. * {@hide} */ static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; /** * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate * that they are optional and should be skipped if the window has * requested system UI flags that ignore those insets for layout. */ static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; /** *

This view doesn't show fading edges.

* {@hide} */ static final int FADING_EDGE_NONE = 0x00000000; /** *

This view shows horizontal fading edges.

* {@hide} */ static final int FADING_EDGE_HORIZONTAL = 0x00001000; /** *

This view shows vertical fading edges.

* {@hide} */ static final int FADING_EDGE_VERTICAL = 0x00002000; /** *

Mask for use with setFlags indicating bits used for indicating which * fading edges are enabled.

* {@hide} */ static final int FADING_EDGE_MASK = 0x00003000; /** *

Indicates this view can be clicked. When clickable, a View reacts * to clicks by notifying the OnClickListener.

* {@hide} */ static final int CLICKABLE = 0x00004000; /** *

Indicates this view is caching its drawing into a bitmap.

* {@hide} */ static final int DRAWING_CACHE_ENABLED = 0x00008000; /** *

Indicates that no icicle should be saved for this view.

* {@hide} */ static final int SAVE_DISABLED = 0x000010000; /** *

Mask for use with setFlags indicating bits used for the saveEnabled * property.

* {@hide} */ static final int SAVE_DISABLED_MASK = 0x000010000; /** *

Indicates that no drawing cache should ever be created for this view.

* {@hide} */ static final int WILL_NOT_CACHE_DRAWING = 0x000020000; /** *

Indicates this view can take / keep focus when int touch mode.

* {@hide} */ static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; /** *

Enables low quality mode for the drawing cache.

*/ public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; /** *

Enables high quality mode for the drawing cache.

*/ public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; /** *

Enables automatic quality mode for the drawing cache.

*/ public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH }; /** *

Mask for use with setFlags indicating bits used for the cache * quality property.

* {@hide} */ static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; /** *

* Indicates this view can be long clicked. When long clickable, a View * reacts to long clicks by notifying the OnLongClickListener or showing a * context menu. *

* {@hide} */ static final int LONG_CLICKABLE = 0x00200000; /** *

Indicates that this view gets its drawable states from its direct parent * and ignores its original internal states.

* * @hide */ static final int DUPLICATE_PARENT_STATE = 0x00400000; /** * The scrollbar style to display the scrollbars inside the content area, * without increasing the padding. The scrollbars will be overlaid with * translucency on the view's content. */ public static final int SCROLLBARS_INSIDE_OVERLAY = 0; /** * The scrollbar style to display the scrollbars inside the padded area, * increasing the padding of the view. The scrollbars will not overlap the * content area of the view. */ public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; /** * The scrollbar style to display the scrollbars at the edge of the view, * without increasing the padding. The scrollbars will be overlaid with * translucency. */ public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; /** * The scrollbar style to display the scrollbars at the edge of the view, * increasing the padding of the view. The scrollbars will only overlap the * background, if any. */ public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; /** * Mask to check if the scrollbar style is overlay or inset. * {@hide} */ static final int SCROLLBARS_INSET_MASK = 0x01000000; /** * Mask to check if the scrollbar style is inside or outside. * {@hide} */ static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; /** * Mask for scrollbar style. * {@hide} */ static final int SCROLLBARS_STYLE_MASK = 0x03000000; /** * View flag indicating that the screen should remain on while the * window containing this view is visible to the user. This effectively * takes care of automatically setting the WindowManager's * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. */ public static final int KEEP_SCREEN_ON = 0x04000000; /** * View flag indicating whether this view should have sound effects enabled * for events such as clicking and touching. */ public static final int SOUND_EFFECTS_ENABLED = 0x08000000; /** * View flag indicating whether this view should have haptic feedback * enabled for events such as long presses. */ public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; /** *

Indicates that the view hierarchy should stop saving state when * it reaches this view. If state saving is initiated immediately at * the view, it will be allowed. * {@hide} */ static final int PARENT_SAVE_DISABLED = 0x20000000; /** *

Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.

* {@hide} */ static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; /** * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} * should add all focusable Views regardless if they are focusable in touch mode. */ public static final int FOCUSABLES_ALL = 0x00000000; /** * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} * should add only Views focusable in touch mode. */ public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; /** * Use with {@link #focusSearch(int)}. Move focus to the previous selectable * item. */ public static final int FOCUS_BACKWARD = 0x00000001; /** * Use with {@link #focusSearch(int)}. Move focus to the next selectable * item. */ public static final int FOCUS_FORWARD = 0x00000002; /** * Use with {@link #focusSearch(int)}. Move focus to the left. */ public static final int FOCUS_LEFT = 0x00000011; /** * Use with {@link #focusSearch(int)}. Move focus up. */ public static final int FOCUS_UP = 0x00000021; /** * Use with {@link #focusSearch(int)}. Move focus to the right. */ public static final int FOCUS_RIGHT = 0x00000042; /** * Use with {@link #focusSearch(int)}. Move focus down. */ public static final int FOCUS_DOWN = 0x00000082; /** * Bits of {@link #getMeasuredWidthAndState()} and * {@link #getMeasuredWidthAndState()} that provide the actual measured size. */ public static final int MEASURED_SIZE_MASK = 0x00ffffff; /** * Bits of {@link #getMeasuredWidthAndState()} and * {@link #getMeasuredWidthAndState()} that provide the additional state bits. */ public static final int MEASURED_STATE_MASK = 0xff000000; /** * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits * for functions that combine both width and height into a single int, * such as {@link #getMeasuredState()} and the childState argument of * {@link #resolveSizeAndState(int, int, int)}. */ public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; /** * Bit of {@link #getMeasuredWidthAndState()} and * {@link #getMeasuredWidthAndState()} that indicates the measured size * is smaller that the space the view would like to have. */ public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; /** * Base View state sets */ // Singles /** * Indicates the view has no states set. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] EMPTY_STATE_SET; /** * Indicates the view is enabled. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] ENABLED_STATE_SET; /** * Indicates the view is focused. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] FOCUSED_STATE_SET; /** * Indicates the view is selected. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] SELECTED_STATE_SET; /** * Indicates the view is pressed. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] PRESSED_STATE_SET; /** * Indicates the view's window has focus. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] WINDOW_FOCUSED_STATE_SET; // Doubles /** * Indicates the view is enabled and has the focus. * * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] ENABLED_FOCUSED_STATE_SET; /** * Indicates the view is enabled and selected. * * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] ENABLED_SELECTED_STATE_SET; /** * Indicates the view is enabled and that its window has focus. * * @see #ENABLED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is focused and selected. * * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] FOCUSED_SELECTED_STATE_SET; /** * Indicates the view has the focus and that its window has the focus. * * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is selected and that its window has the focus. * * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; // Triples /** * Indicates the view is enabled, focused and selected. * * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; /** * Indicates the view is enabled, focused and its window has the focus. * * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is enabled, selected and its window has the focus. * * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is focused, selected and its window has the focus. * * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is enabled, focused, selected and its window * has the focus. * * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed and its window has the focus. * * @see #PRESSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed and selected. * * @see #PRESSED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] PRESSED_SELECTED_STATE_SET; /** * Indicates the view is pressed, selected and its window has the focus. * * @see #PRESSED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed and focused. * * @see #PRESSED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] PRESSED_FOCUSED_STATE_SET; /** * Indicates the view is pressed, focused and its window has the focus. * * @see #PRESSED_STATE_SET * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed, focused and selected. * * @see #PRESSED_STATE_SET * @see #SELECTED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; /** * Indicates the view is pressed, focused, selected and its window has the focus. * * @see #PRESSED_STATE_SET * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed and enabled. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET */ protected static final int[] PRESSED_ENABLED_STATE_SET; /** * Indicates the view is pressed, enabled and its window has the focus. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed, enabled and selected. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; /** * Indicates the view is pressed, enabled, selected and its window has the * focus. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed, enabled and focused. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; /** * Indicates the view is pressed, enabled, focused and its window has the * focus. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed, enabled, focused and selected. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; /** * Indicates the view is pressed, enabled, focused, selected and its window * has the focus. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * The order here is very important to {@link #getDrawableState()} */ private static final int[][] VIEW_STATE_SETS; static final int VIEW_STATE_WINDOW_FOCUSED = 1; static final int VIEW_STATE_SELECTED = 1 << 1; static final int VIEW_STATE_FOCUSED = 1 << 2; static final int VIEW_STATE_ENABLED = 1 << 3; static final int VIEW_STATE_PRESSED = 1 << 4; static final int VIEW_STATE_ACTIVATED = 1 << 5; static final int VIEW_STATE_ACCELERATED = 1 << 6; static final int VIEW_STATE_HOVERED = 1 << 7; static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; static final int[] VIEW_STATE_IDS = new int[] { R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, R.attr.state_selected, VIEW_STATE_SELECTED, R.attr.state_focused, VIEW_STATE_FOCUSED, R.attr.state_enabled, VIEW_STATE_ENABLED, R.attr.state_pressed, VIEW_STATE_PRESSED, R.attr.state_activated, VIEW_STATE_ACTIVATED, R.attr.state_accelerated, VIEW_STATE_ACCELERATED, R.attr.state_hovered, VIEW_STATE_HOVERED, R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED }; static { if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { throw new IllegalStateException( "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); } int[] orderedIds = new int[VIEW_STATE_IDS.length]; for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { int viewState = R.styleable.ViewDrawableStates[i]; for (int j = 0; j sThreadLocal = new ThreadLocal(); /** * Map used to store views' tags. */ private SparseArray mKeyedTags; /** * The next available accessibility id. */ private static int sNextAccessibilityViewId; /** * The animation currently associated with this view. * @hide */ protected Animation mCurrentAnimation = null; /** * Width as measured during measure pass. * {@hide} */ @ViewDebug.ExportedProperty(category = "measurement") int mMeasuredWidth; /** * Height as measured during measure pass. * {@hide} */ @ViewDebug.ExportedProperty(category = "measurement") int mMeasuredHeight; /** * Flag to indicate that this view was marked INVALIDATED, or had its display list * invalidated, prior to the current drawing iteration. If true, the view must re-draw * its display list. This flag, used only when hw accelerated, allows us to clear the * flag while retaining this information until it's needed (at getDisplayList() time and * in drawChild(), when we decide to draw a view's children's display lists into our own). * * {@hide} */ boolean mRecreateDisplayList = false; /** * The view's identifier. * {@hide} * * @see #setId(int) * @see #getId() */ @ViewDebug.ExportedProperty(resolveId = true) int mID = NO_ID; /** * The stable ID of this view for accessibility purposes. */ int mAccessibilityViewId = NO_ID; private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent; /** * The view's tag. * {@hide} * * @see #setTag(Object) * @see #getTag() */ protected Object mTag; // for mPrivateFlags: /** {@hide} */ static final int PFLAG_WANTS_FOCUS = 0x00000001; /** {@hide} */ static final int PFLAG_FOCUSED = 0x00000002; /** {@hide} */ static final int PFLAG_SELECTED = 0x00000004; /** {@hide} */ static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; /** {@hide} */ static final int PFLAG_HAS_BOUNDS = 0x00000010; /** {@hide} */ static final int PFLAG_DRAWN = 0x00000020; /** * When this flag is set, this view is running an animation on behalf of its * children and should therefore not cancel invalidate requests, even if they * lie outside of this view's bounds. * * {@hide} */ static final int PFLAG_DRAW_ANIMATION = 0x00000040; /** {@hide} */ static final int PFLAG_SKIP_DRAW = 0x00000080; /** {@hide} */ static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; /** {@hide} */ static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; /** {@hide} */ static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; /** {@hide} */ static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; /** {@hide} */ static final int PFLAG_FORCE_LAYOUT = 0x00001000; /** {@hide} */ static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; private static final int PFLAG_PRESSED = 0x00004000; /** {@hide} */ static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; /** * Flag used to indicate that this view should be drawn once more (and only once * more) after its animation has completed. * {@hide} */ static final int PFLAG_ANIMATION_STARTED = 0x00010000; private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; /** * Indicates that the View returned true when onSetAlpha() was called and that * the alpha must be restored. * {@hide} */ static final int PFLAG_ALPHA_SET = 0x00040000; /** * Set by {@link #setScrollContainer(boolean)}. */ static final int PFLAG_SCROLL_CONTAINER = 0x00080000; /** * Set by {@link #setScrollContainer(boolean)}. */ static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; /** * View flag indicating whether this view was invalidated (fully or partially.) * * @hide */ static final int PFLAG_DIRTY = 0x00200000; /** * View flag indicating whether this view was invalidated by an opaque * invalidate request. * * @hide */ static final int PFLAG_DIRTY_OPAQUE = 0x00400000; /** * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. * * @hide */ static final int PFLAG_DIRTY_MASK = 0x00600000; /** * Indicates whether the background is opaque. * * @hide */ static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; /** * Indicates whether the scrollbars are opaque. * * @hide */ static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; /** * Indicates whether the view is opaque. * * @hide */ static final int PFLAG_OPAQUE_MASK = 0x01800000; /** * Indicates a prepressed state; * the short time between ACTION_DOWN and recognizing * a 'real' press. Prepressed is used to recognize quick taps * even when they are shorter than ViewConfiguration.getTapTimeout(). * * @hide */ private static final int PFLAG_PREPRESSED = 0x02000000; /** * Indicates whether the view is temporarily detached. * * @hide */ static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; /** * Indicates that we should awaken scroll bars once attached * * @hide */ private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; /** * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. * @hide */ private static final int PFLAG_HOVERED = 0x10000000; /** * Indicates that pivotX or pivotY were explicitly set and we should not assume the center * for transform operations * * @hide */ private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; /** {@hide} */ static final int PFLAG_ACTIVATED = 0x40000000; /** * Indicates that this view was specifically invalidated, not just dirtied because some * child view was invalidated. The flag is used to determine when we need to recreate * a view's display list (as opposed to just returning a reference to its existing * display list). * * @hide */ static final int PFLAG_INVALIDATED = 0x80000000; /** * Masks for mPrivateFlags2, as generated by dumpFlags(): * * |-------|-------|-------|-------| * 1 PFLAG2_DRAG_CAN_ACCEPT * 1 PFLAG2_DRAG_HOVERED * 11 PFLAG2_LAYOUT_DIRECTION_MASK * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] * 111 PFLAG2_TEXT_DIRECTION_MASK * 1 PFLAG2_TEXT_DIRECTION_RESOLVED * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] * 111 PFLAG2_TEXT_ALIGNMENT_MASK * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK * 111 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK * 11 PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK * 1 PFLAG2_ACCESSIBILITY_FOCUSED * 1 PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED * 1 PFLAG2_VIEW_QUICK_REJECTED * 1 PFLAG2_PADDING_RESOLVED * 1 PFLAG2_DRAWABLE_RESOLVED * 1 PFLAG2_HAS_TRANSIENT_STATE * |-------|-------|-------|-------| */ /** * Indicates that this view has reported that it can accept the current drag's content. * Cleared when the drag operation concludes. * @hide */ static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; /** * Indicates that this view is currently directly under the drag location in a * drag-and-drop operation involving content that it can accept. Cleared when * the drag exits the view, or when the drag operation concludes. * @hide */ static final int PFLAG2_DRAG_HOVERED = 0x00000002; /** * Horizontal layout direction of this view is from Left to Right. * Use with {@link #setLayoutDirection}. */ public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR; /** * Horizontal layout direction of this view is from Right to Left. * Use with {@link #setLayoutDirection}. */ public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL; /** * Horizontal layout direction of this view is inherited from its parent. * Use with {@link #setLayoutDirection}. */ public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT; /** * Horizontal layout direction of this view is from deduced from the default language * script for the locale. Use with {@link #setLayoutDirection}. */ public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE; /** * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) * @hide */ static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; /** * Mask for use with private flags indicating bits used for horizontal layout direction. * @hide */ static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; /** * Indicates whether the view horizontal layout direction has been resolved and drawn to the * right-to-left direction. * @hide */ static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; /** * Indicates whether the view horizontal layout direction has been resolved. * @hide */ static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; /** * Mask for use with private flags indicating bits used for resolved horizontal layout direction. * @hide */ static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; /* * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct * flag value. * @hide */ private static final int[] LAYOUT_DIRECTION_FLAGS = { LAYOUT_DIRECTION_LTR, LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE }; /** * Default horizontal layout direction. */ private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; /** * Default horizontal layout direction. * @hide */ static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; /** * Text direction is inherited thru {@link ViewGroup} */ public static final int TEXT_DIRECTION_INHERIT = 0; /** * Text direction is using "first strong algorithm". The first strong directional character * determines the paragraph direction. If there is no strong directional character, the * paragraph direction is the view's resolved layout direction. */ public static final int TEXT_DIRECTION_FIRST_STRONG = 1; /** * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. * If there are neither, the paragraph direction is the view's resolved layout direction. */ public static final int TEXT_DIRECTION_ANY_RTL = 2; /** * Text direction is forced to LTR. */ public static final int TEXT_DIRECTION_LTR = 3; /** * Text direction is forced to RTL. */ public static final int TEXT_DIRECTION_RTL = 4; /** * Text direction is coming from the system Locale. */ public static final int TEXT_DIRECTION_LOCALE = 5; /** * Default text direction is inherited */ private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; /** * Default resolved text direction * @hide */ static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; /** * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) * @hide */ static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; /** * Mask for use with private flags indicating bits used for text direction. * @hide */ static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; /** * Array of text direction flags for mapping attribute "textDirection" to correct * flag value. * @hide */ private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT }; /** * Indicates whether the view text direction has been resolved. * @hide */ static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; /** * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) * @hide */ static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; /** * Mask for use with private flags indicating bits used for resolved text direction. * @hide */ static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; /** * Indicates whether the view text direction has been resolved to the "first strong" heuristic. * @hide */ static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; /* * Default text alignment. The text alignment of this View is inherited from its parent. * Use with {@link #setTextAlignment(int)} */ public static final int TEXT_ALIGNMENT_INHERIT = 0; /** * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. * * Use with {@link #setTextAlignment(int)} */ public static final int TEXT_ALIGNMENT_GRAVITY = 1; /** * Align to the start of the paragraph, e.g. ALIGN_NORMAL. * * Use with {@link #setTextAlignment(int)} */ public static final int TEXT_ALIGNMENT_TEXT_START = 2; /** * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. * * Use with {@link #setTextAlignment(int)} */ public static final int TEXT_ALIGNMENT_TEXT_END = 3; /** * Center the paragraph, e.g. ALIGN_CENTER. * * Use with {@link #setTextAlignment(int)} */ public static final int TEXT_ALIGNMENT_CENTER = 4; /** * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved * layoutDirection is LTR, and ALIGN_RIGHT otherwise. * * Use with {@link #setTextAlignment(int)} */ public static final int TEXT_ALIGNMENT_VIEW_START = 5; /** * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved * layoutDirection is LTR, and ALIGN_LEFT otherwise. * * Use with {@link #setTextAlignment(int)} */ public static final int TEXT_ALIGNMENT_VIEW_END = 6; /** * Default text alignment is inherited */ private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; /** * Default resolved text alignment * @hide */ static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; /** * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) * @hide */ static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; /** * Mask for use with private flags indicating bits used for text alignment. * @hide */ static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; /** * Array of text direction flags for mapping attribute "textAlignment" to correct * flag value. * @hide */ private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT }; /** * Indicates whether the view text alignment has been resolved. * @hide */ static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; /** * Bit shift to get the resolved text alignment. * @hide */ static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; /** * Mask for use with private flags indicating bits used for text alignment. * @hide */ static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; /** * Indicates whether if the view text alignment has been resolved to gravity */ private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; // Accessiblity constants for mPrivateFlags2 /** * Shift for the bits in {@link #mPrivateFlags2} related to the * "importantForAccessibility" attribute. */ static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; /** * Automatically determine whether a view is important for accessibility. */ public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; /** * The view is important for accessibility. */ public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; /** * The view is not important for accessibility. */ public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; /** * The view is not important for accessibility, nor are any of its * descendant views. */ public static final int IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS = 0x00000004; /** * The default whether the view is important for accessibility. */ static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; /** * Mask for obtainig the bits which specify how to determine * whether a view is important for accessibility. */ static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO | IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; /** * Shift for the bits in {@link #mPrivateFlags2} related to the * "accessibilityLiveRegion" attribute. */ static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT = 23; /** * Live region mode specifying that accessibility services should not * automatically announce changes to this view. This is the default live * region mode for most views. *

* Use with {@link #setAccessibilityLiveRegion(int)}. */ public static final int ACCESSIBILITY_LIVE_REGION_NONE = 0x00000000; /** * Live region mode specifying that accessibility services should announce * changes to this view. *

* Use with {@link #setAccessibilityLiveRegion(int)}. */ public static final int ACCESSIBILITY_LIVE_REGION_POLITE = 0x00000001; /** * Live region mode specifying that accessibility services should interrupt * ongoing speech to immediately announce changes to this view. *

* Use with {@link #setAccessibilityLiveRegion(int)}. */ public static final int ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 0x00000002; /** * The default whether the view is important for accessibility. */ static final int ACCESSIBILITY_LIVE_REGION_DEFAULT = ACCESSIBILITY_LIVE_REGION_NONE; /** * Mask for obtaining the bits which specify a view's accessibility live * region mode. */ static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK = (ACCESSIBILITY_LIVE_REGION_NONE | ACCESSIBILITY_LIVE_REGION_POLITE | ACCESSIBILITY_LIVE_REGION_ASSERTIVE) << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT; /** * Flag indicating whether a view has accessibility focus. */ static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000; /** * Flag whether the accessibility state of the subtree rooted at this view changed. */ static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000; /** * Flag indicating whether a view failed the quickReject() check in draw(). This condition * is used to check whether later changes to the view's transform should invalidate the * view to force the quickReject test to run again. */ static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; /** * Flag indicating that start/end padding has been resolved into left/right padding * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved * during measurement. In some special cases this is required such as when an adapter-based * view measures prospective children without attaching them to a window. */ static final int PFLAG2_PADDING_RESOLVED = 0x20000000; /** * Flag indicating that the start/end drawables has been resolved into left/right ones. */ static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; /** * Indicates that the view is tracking some sort of transient state * that the app should not need to be aware of, but that the framework * should take special care to preserve. */ static final int PFLAG2_HAS_TRANSIENT_STATE = 0x80000000; /** * Group of bits indicating that RTL properties resolution is done. */ static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_PADDING_RESOLVED | PFLAG2_DRAWABLE_RESOLVED; // There are a couple of flags left in mPrivateFlags2 /* End of masks for mPrivateFlags2 */ /* Masks for mPrivateFlags3 */ /** * Flag indicating that view has a transform animation set on it. This is used to track whether * an animation is cleared between successive frames, in order to tell the associated * DisplayList to clear its animation matrix. */ static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; /** * Flag indicating that view has an alpha animation set on it. This is used to track whether an * animation is cleared between successive frames, in order to tell the associated * DisplayList to restore its alpha value. */ static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; /** * Flag indicating that the view has been through at least one layout since it * was last attached to a window. */ static final int PFLAG3_IS_LAID_OUT = 0x4; /** * Flag indicating that a call to measure() was skipped and should be done * instead when layout() is invoked. */ static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8; /** * Flag indicating that an overridden method correctly called down to * the superclass implementation as required by the API spec. */ static final int PFLAG3_CALLED_SUPER = 0x10; /* End of masks for mPrivateFlags3 */ static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; /** * Always allow a user to over-scroll this view, provided it is a * view that can scroll. * * @see #getOverScrollMode() * @see #setOverScrollMode(int) */ public static final int OVER_SCROLL_ALWAYS = 0; /** * Allow a user to over-scroll this view only if the content is large * enough to meaningfully scroll, provided it is a view that can scroll. * * @see #getOverScrollMode() * @see #setOverScrollMode(int) */ public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; /** * Never allow a user to over-scroll this view. * * @see #getOverScrollMode() * @see #setOverScrollMode(int) */ public static final int OVER_SCROLL_NEVER = 2; /** * Special constant for {@link #setSystemUiVisibility(int)}: View has * requested the system UI (status bar) to be visible (the default). * * @see #setSystemUiVisibility(int) */ public static final int SYSTEM_UI_FLAG_VISIBLE = 0; /** * Flag for {@link #setSystemUiVisibility(int)}: View has requested the * system UI to enter an unobtrusive "low profile" mode. * *

This is for use in games, book readers, video players, or any other * "immersive" application where the usual system chrome is deemed too distracting. * *

In low profile mode, the status bar and/or navigation icons may dim. * * @see #setSystemUiVisibility(int) */ public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; /** * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the * system navigation be temporarily hidden. * *

This is an even less obtrusive state than that called for by * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls * (Home, Back, and the like) on screen, SYSTEM_UI_FLAG_HIDE_NAVIGATION will cause * those to disappear. This is useful (in conjunction with the * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} * window flags) for displaying content using every last pixel on the display. * *

There is a limitation: because navigation controls are so important, the least user * interaction will cause them to reappear immediately. When this happens, both * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, * so that both elements reappear at the same time. * * @see #setSystemUiVisibility(int) */ public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; /** * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go * into the normal fullscreen mode so that its content can take over the screen * while still allowing the user to interact with the application. * *

This has the same visual effect as * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN * WindowManager.LayoutParams.FLAG_FULLSCREEN}, * meaning that non-critical screen decorations (such as the status bar) will be * hidden while the user is in the View's window, focusing the experience on * that content. Unlike the window flag, if you are using ActionBar in * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also * hide the action bar. * *

This approach to going fullscreen is best used over the window flag when * it is a transient state -- that is, the application does this at certain * points in its user interaction where it wants to allow the user to focus * on content, but not as a continuous state. For situations where the application * would like to simply stay full screen the entire time (such as a game that * wants to take over the screen), the * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} * is usually a better approach. The state set here will be removed by the system * in various situations (such as the user moving to another application) like * the other system UI states. * *

When using this flag, the application should provide some easy facility * for the user to go out of it. A common example would be in an e-book * reader, where tapping on the screen brings back whatever screen and UI * decorations that had been hidden while the user was immersed in reading * the book. * * @see #setSystemUiVisibility(int) */ public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; /** * Flag for {@link #setSystemUiVisibility(int)}: When using other layout * flags, we would like a stable view of the content insets given to * {@link #fitSystemWindows(Rect)}. This means that the insets seen there * will always represent the worst case that the application can expect * as a continuous state. In the stock Android UI this is the space for * the system bar, nav bar, and status bar, but not more transient elements * such as an input method. * * The stable layout your UI sees is based on the system UI modes you can * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} * then you will get a stable layout for changes of the * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} * with a stable layout. (Note that you should avoid using * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) * * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), * then a hidden status bar will be considered a "stable" state for purposes * here. This allows your UI to continually hide the status bar, while still * using the system UI flags to hide the action bar while still retaining * a stable layout. Note that changing the window fullscreen flag will never * provide a stable layout for a clean transition. * *

If you are using ActionBar in * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the * insets it adds to those given to the application. */ public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; /** * Flag for {@link #setSystemUiVisibility(int)}: View would like its window * to be layed out as if it has requested * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This * allows it to avoid artifacts when switching in and out of that mode, at * the expense that some of its user interface may be covered by screen * decorations when they are shown. You can perform layout of your inner * UI elements to account for the navigation system UI through the * {@link #fitSystemWindows(Rect)} method. */ public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; /** * Flag for {@link #setSystemUiVisibility(int)}: View would like its window * to be layed out as if it has requested * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This * allows it to avoid artifacts when switching in and out of that mode, at * the expense that some of its user interface may be covered by screen * decorations when they are shown. You can perform layout of your inner * UI elements to account for non-fullscreen system UI through the * {@link #fitSystemWindows(Rect)} method. */ public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; /** * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when * hiding the navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. If this flag is * not set, {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any * user interaction. *

Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only * has an effect when used in combination with that flag.

*/ public static final int SYSTEM_UI_FLAG_IMMERSIVE = 0x00000800; /** * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when * hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the navigation * bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. Use this flag to create an immersive * experience while also hiding the system bars. If this flag is not set, * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any user * interaction, and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be force-cleared by the system * if the user swipes from the top of the screen. *

When system bars are hidden in immersive mode, they can be revealed temporarily with * system gestures, such as swiping from the top of the screen. These transient system bars * will overlay app’s content, may have some degree of transparency, and will automatically * hide after a short timeout. *

Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_FULLSCREEN} and * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only has an effect when used in combination * with one or both of those flags.

*/ public static final int SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 0x00001000; /** * SPRD: Flag for {@link #setSystemUiVisibility(int)}: View can use this * flag to hide the Surface of the window it attached to. This is usally * used when a VideoPlayer is playing and want to hide its main window's * Surface for performance. */ public static final int SYSTEM_UI_FLAG_HIDE_SURFACE = 0x00002000; /** * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. */ public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; /** * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. */ public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to make the status bar not expandable. Unless you also * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. */ public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to hide notification icons and scrolling ticker text. */ public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to disable incoming notification alerts. This will not block * icons, but it will block sound, vibrating and other visual or aural notifications. */ public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to hide only the scrolling ticker. Note that * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. */ public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to hide the center system info area. */ public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to hide only the home button. Don't use this * unless you're a special part of the system UI (i.e., setup wizard, keyguard). */ public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to hide only the back button. Don't use this * unless you're a special part of the system UI (i.e., setup wizard, keyguard). */ public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to hide only the clock. You might use this if your activity has * its own clock making the status bar's clock redundant. */ public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to hide only the recent apps button. Don't use this * unless you're a special part of the system UI (i.e., setup wizard, keyguard). */ public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to disable the global search gesture. Don't use this * unless you're a special part of the system UI (i.e., setup wizard, keyguard). */ public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to specify that the status bar is displayed in transient mode. */ public static final int STATUS_BAR_TRANSIENT = 0x04000000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to specify that the navigation bar is displayed in transient mode. */ public static final int NAVIGATION_BAR_TRANSIENT = 0x08000000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to specify that the hidden status bar would like to be shown. */ public static final int STATUS_BAR_UNHIDE = 0x10000000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to specify that the hidden navigation bar would like to be shown. */ public static final int NAVIGATION_BAR_UNHIDE = 0x20000000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to specify that the status bar is displayed in translucent mode. */ public static final int STATUS_BAR_TRANSLUCENT = 0x40000000; /** * @hide * * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked * out of the public fields to keep the undefined bits out of the developer's way. * * Flag to specify that the navigation bar is displayed in translucent mode. */ public static final int NAVIGATION_BAR_TRANSLUCENT = 0x80000000; /** * @hide */ public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; /** * These are the system UI flags that can be cleared by events outside * of an application. Currently this is just the ability to tap on the * screen while hiding the navigation bar to have it return. * @hide */ public static final int SYSTEM_UI_CLEARABLE_FLAGS = SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION | SYSTEM_UI_FLAG_FULLSCREEN; /** * Flags that can impact the layout in relation to system UI. */ public static final int SYSTEM_UI_LAYOUT_FLAGS = SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; /** * Find views that render the specified text. * * @see #findViewsWithText(ArrayList, CharSequence, int) */ public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; /** * Find find views that contain the specified content description. * * @see #findViewsWithText(ArrayList, CharSequence, int) */ public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; /** * Find views that contain {@link AccessibilityNodeProvider}. Such * a View is a root of virtual view hierarchy and may contain the searched * text. If this flag is set Views with providers are automatically * added and it is a responsibility of the client to call the APIs of * the provider to determine whether the virtual tree rooted at this View * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s * represeting the virtual views with this text. * * @see #findViewsWithText(ArrayList, CharSequence, int) * * @hide */ public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; /** * The undefined cursor position. * * @hide */ public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; /** * Indicates that the screen has changed state and is now off. * * @see #onScreenStateChanged(int) */ public static final int SCREEN_STATE_OFF = 0x0; /** * Indicates that the screen has changed state and is now on. * * @see #onScreenStateChanged(int) */ public static final int SCREEN_STATE_ON = 0x1; /** * Controls the over-scroll mode for this view. * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, * and {@link #OVER_SCROLL_NEVER}. */ private int mOverScrollMode; /** * The parent this view is attached to. * {@hide} * * @see #getParent() */ protected ViewParent mParent; /** * {@hide} */ AttachInfo mAttachInfo; /** * {@hide} */ @ViewDebug.ExportedProperty(flagMapping = { @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, name = "FORCE_LAYOUT"), @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, name = "LAYOUT_REQUIRED"), @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, name = "DRAWING_CACHE_INVALID", outputIf = false), @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") }) int mPrivateFlags; int mPrivateFlags2; int mPrivateFlags3; /** * This view's request for the visibility of the status bar. * @hide */ @ViewDebug.ExportedProperty(flagMapping = { @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, equals = SYSTEM_UI_FLAG_LOW_PROFILE, name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, equals = SYSTEM_UI_FLAG_VISIBLE, name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) }) int mSystemUiVisibility; /** * Reference count for transient state. * @see #setHasTransientState(boolean) */ int mTransientStateCount = 0; /** * Count of how many windows this view has been attached to. */ int mWindowAttachCount; /** * The layout parameters associated with this view and used by the parent * {@link android.view.ViewGroup} to determine how this view should be * laid out. * {@hide} */ protected ViewGroup.LayoutParams mLayoutParams; /** * The view flags hold various views states. * {@hide} */ @ViewDebug.ExportedProperty int mViewFlags; static class TransformationInfo { /** * The transform matrix for the View. This transform is calculated internally * based on the rotation, scaleX, and scaleY properties. The identity matrix * is used by default. Do *not* use this variable directly; instead call * getMatrix(), which will automatically recalculate the matrix if necessary * to get the correct matrix based on the latest rotation and scale properties. */ private final Matrix mMatrix = new Matrix(); /** * The transform matrix for the View. This transform is calculated internally * based on the rotation, scaleX, and scaleY properties. The identity matrix * is used by default. Do *not* use this variable directly; instead call * getInverseMatrix(), which will automatically recalculate the matrix if necessary * to get the correct matrix based on the latest rotation and scale properties. */ private Matrix mInverseMatrix; /** * An internal variable that tracks whether we need to recalculate the * transform matrix, based on whether the rotation or scaleX/Y properties * have changed since the matrix was last calculated. */ boolean mMatrixDirty = false; /** * An internal variable that tracks whether we need to recalculate the * transform matrix, based on whether the rotation or scaleX/Y properties * have changed since the matrix was last calculated. */ private boolean mInverseMatrixDirty = true; /** * A variable that tracks whether we need to recalculate the * transform matrix, based on whether the rotation or scaleX/Y properties * have changed since the matrix was last calculated. This variable * is only valid after a call to updateMatrix() or to a function that * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). */ private boolean mMatrixIsIdentity = true; /** * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. */ private Camera mCamera = null; /** * This matrix is used when computing the matrix for 3D rotations. */ private Matrix matrix3D = null; /** * These prev values are used to recalculate a centered pivot point when necessary. The * pivot point is only used in matrix operations (when rotation, scale, or translation are * set), so thes values are only used then as well. */ private int mPrevWidth = -1; private int mPrevHeight = -1; /** * The degrees rotation around the vertical axis through the pivot point. */ @ViewDebug.ExportedProperty float mRotationY = 0f; /** * The degrees rotation around the horizontal axis through the pivot point. */ @ViewDebug.ExportedProperty float mRotationX = 0f; /** * The degrees rotation around the pivot point. */ @ViewDebug.ExportedProperty float mRotation = 0f; /** * The amount of translation of the object away from its left property (post-layout). */ @ViewDebug.ExportedProperty float mTranslationX = 0f; /** * The amount of translation of the object away from its top property (post-layout). */ @ViewDebug.ExportedProperty float mTranslationY = 0f; /** * The amount of scale in the x direction around the pivot point. A * value of 1 means no scaling is applied. */ @ViewDebug.ExportedProperty float mScaleX = 1f; /** * The amount of scale in the y direction around the pivot point. A * value of 1 means no scaling is applied. */ @ViewDebug.ExportedProperty float mScaleY = 1f; /** * The x location of the point around which the view is rotated and scaled. */ @ViewDebug.ExportedProperty float mPivotX = 0f; /** * The y location of the point around which the view is rotated and scaled. */ @ViewDebug.ExportedProperty float mPivotY = 0f; /** * The opacity of the View. This is a value from 0 to 1, where 0 means * completely transparent and 1 means completely opaque. */ @ViewDebug.ExportedProperty float mAlpha = 1f; /** * The opacity of the view as manipulated by the Fade transition. This is a hidden * property only used by transitions, which is composited with the other alpha * values to calculate the final visual alpha value. */ float mTransitionAlpha = 1f; } TransformationInfo mTransformationInfo; /** * Current clip bounds. to which all drawing of this view are constrained. */ private Rect mClipBounds = null; private boolean mLastIsOpaque; /** * Convenience value to check for float values that are close enough to zero to be considered * zero. */ private static final float NONZERO_EPSILON = .001f; /** * The distance in pixels from the left edge of this view's parent * to the left edge of this view. * {@hide} */ @ViewDebug.ExportedProperty(category = "layout") protected int mLeft; /** * The distance in pixels from the left edge of this view's parent * to the right edge of this view. * {@hide} */ @ViewDebug.ExportedProperty(category = "layout") protected int mRight; /** * The distance in pixels from the top edge of this view's parent * to the top edge of this view. * {@hide} */ @ViewDebug.ExportedProperty(category = "layout") protected int mTop; /** * The distance in pixels from the top edge of this view's parent * to the bottom edge of this view. * {@hide} */ @ViewDebug.ExportedProperty(category = "layout") protected int mBottom; /** * The offset, in pixels, by which the content of this view is scrolled * horizontally. * {@hide} */ @ViewDebug.ExportedProperty(category = "scrolling") protected int mScrollX; /** * The offset, in pixels, by which the content of this view is scrolled * vertically. * {@hide} */ @ViewDebug.ExportedProperty(category = "scrolling") protected int mScrollY; /** * The left padding in pixels, that is the distance in pixels between the * left edge of this view and the left edge of its content. * {@hide} */ @ViewDebug.ExportedProperty(category = "padding") protected int mPaddingLeft = 0; /** * The right padding in pixels, that is the distance in pixels between the * right edge of this view and the right edge of its content. * {@hide} */ @ViewDebug.ExportedProperty(category = "padding") protected int mPaddingRight = 0; /** * The top padding in pixels, that is the distance in pixels between the * top edge of this view and the top edge of its content. * {@hide} */ @ViewDebug.ExportedProperty(category = "padding") protected int mPaddingTop; /** * The bottom padding in pixels, that is the distance in pixels between the * bottom edge of this view and the bottom edge of its content. * {@hide} */ @ViewDebug.ExportedProperty(category = "padding") protected int mPaddingBottom; /** * The layout insets in pixels, that is the distance in pixels between the * visible edges of this view its bounds. */ private Insets mLayoutInsets; /** * Briefly describes the view and is primarily used for accessibility support. */ private CharSequence mContentDescription; /** * Specifies the id of a view for which this view serves as a label for * accessibility purposes. */ private int mLabelForId = View.NO_ID; /** * Predicate for matching labeled view id with its label for * accessibility purposes. */ private MatchLabelForPredicate mMatchLabelForPredicate; /** * Predicate for matching a view by its id. */ private MatchIdPredicate mMatchIdPredicate; /** * Cache the paddingRight set by the user to append to the scrollbar's size. * * @hide */ @ViewDebug.ExportedProperty(category = "padding") protected int mUserPaddingRight; /** * Cache the paddingBottom set by the user to append to the scrollbar's size. * * @hide */ @ViewDebug.ExportedProperty(category = "padding") protected int mUserPaddingBottom; /** * Cache the paddingLeft set by the user to append to the scrollbar's size. * * @hide */ @ViewDebug.ExportedProperty(category = "padding") protected int mUserPaddingLeft; /** * Cache the paddingStart set by the user to append to the scrollbar's size. * */ @ViewDebug.ExportedProperty(category = "padding") int mUserPaddingStart; /** * Cache the paddingEnd set by the user to append to the scrollbar's size. * */ @ViewDebug.ExportedProperty(category = "padding") int mUserPaddingEnd; /** * Cache initial left padding. * * @hide */ int mUserPaddingLeftInitial; /** * Cache initial right padding. * * @hide */ int mUserPaddingRightInitial; /** * Default undefined padding */ private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; /** * Cache if a left padding has been defined */ private boolean mLeftPaddingDefined = false; /** * Cache if a right padding has been defined */ private boolean mRightPaddingDefined = false; /** * @hide */ int mOldWidthMeasureSpec = Integer.MIN_VALUE; /** * @hide */ int mOldHeightMeasureSpec = Integer.MIN_VALUE; private LongSparseLongArray mMeasureCache; @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") private Drawable mBackground; private int mBackgroundResource; private boolean mBackgroundSizeChanged; static class ListenerInfo { /** * Listener used to dispatch focus change events. * This field should be made private, so it is hidden from the SDK. * {@hide} */ protected OnFocusChangeListener mOnFocusChangeListener; /** * Listeners for layout change events. */ private ArrayList mOnLayoutChangeListeners; /** * Listeners for attach events. */ private CopyOnWriteArrayList mOnAttachStateChangeListeners; /** * Listener used to dispatch click events. * This field should be made private, so it is hidden from the SDK. * {@hide} */ public OnClickListener mOnClickListener; /** * Listener used to dispatch long click events. * This field should be made private, so it is hidden from the SDK. * {@hide} */ protected OnLongClickListener mOnLongClickListener; /** * Listener used to build the context menu. * This field should be made private, so it is hidden from the SDK. * {@hide} */ protected OnCreateContextMenuListener mOnCreateContextMenuListener; private OnKeyListener mOnKeyListener; private OnTouchListener mOnTouchListener; private OnHoverListener mOnHoverListener; private OnGenericMotionListener mOnGenericMotionListener; private OnDragListener mOnDragListener; private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; } ListenerInfo mListenerInfo; /** * The application environment this view lives in. * This field should be made private, so it is hidden from the SDK. * {@hide} */ protected Context mContext; private final Resources mResources; private ScrollabilityCache mScrollCache; private int[] mDrawableState = null; /** * When this view has focus and the next focus is {@link #FOCUS_LEFT}, * the user may specify which view to go to next. */ private int mNextFocusLeftId = View.NO_ID; /** * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, * the user may specify which view to go to next. */ private int mNextFocusRightId = View.NO_ID; /** * When this view has focus and the next focus is {@link #FOCUS_UP}, * the user may specify which view to go to next. */ private int mNextFocusUpId = View.NO_ID; /** * When this view has focus and the next focus is {@link #FOCUS_DOWN}, * the user may specify which view to go to next. */ private int mNextFocusDownId = View.NO_ID; /** * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, * the user may specify which view to go to next. */ int mNextFocusForwardId = View.NO_ID; private CheckForLongPress mPendingCheckForLongPress; private CheckForTap mPendingCheckForTap = null; private PerformClick mPerformClick; private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; private UnsetPressedState mUnsetPressedState; /** * Whether the long press's action has been invoked. The tap's action is invoked on the * up event while a long press is invoked as soon as the long press duration is reached, so * a long press could be performed before the tap is checked, in which case the tap's action * should not be invoked. */ private boolean mHasPerformedLongPress; /** * The minimum height of the view. We'll try our best to have the height * of this view to at least this amount. */ @ViewDebug.ExportedProperty(category = "measurement") private int mMinHeight; /** * The minimum width of the view. We'll try our best to have the width * of this view to at least this amount. */ @ViewDebug.ExportedProperty(category = "measurement") private int mMinWidth; /** * The delegate to handle touch events that are physically in this view * but should be handled by another view. */ private TouchDelegate mTouchDelegate = null; /** * Solid color to use as a background when creating the drawing cache. Enables * the cache to use 16 bit bitmaps instead of 32 bit. */ private int mDrawingCacheBackgroundColor = 0; /** * Special tree observer used when mAttachInfo is null. */ private ViewTreeObserver mFloatingTreeObserver; /** * Cache the touch slop from the context that created the view. */ private int mTouchSlop; /** * Object that handles automatic animation of view properties. */ private ViewPropertyAnimator mAnimator = null; /** * Flag indicating that a drag can cross window boundaries. When * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called * with this flag set, all visible applications will be able to participate * in the drag operation and receive the dragged content. * * @hide */ public static final int DRAG_FLAG_GLOBAL = 1; /** * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. */ private float mVerticalScrollFactor; /** * Position of the vertical scroll bar. */ private int mVerticalScrollbarPosition; /** * Position the scroll bar at the default position as determined by the system. */ public static final int SCROLLBAR_POSITION_DEFAULT = 0; /** * Position the scroll bar along the left edge. */ public static final int SCROLLBAR_POSITION_LEFT = 1; /** * Position the scroll bar along the right edge. */ public static final int SCROLLBAR_POSITION_RIGHT = 2; /** * Indicates that the view does not have a layer. * * @see #getLayerType() * @see #setLayerType(int, android.graphics.Paint) * @see #LAYER_TYPE_SOFTWARE * @see #LAYER_TYPE_HARDWARE */ public static final int LAYER_TYPE_NONE = 0; /** *

Indicates that the view has a software layer. A software layer is backed * by a bitmap and causes the view to be rendered using Android's software * rendering pipeline, even if hardware acceleration is enabled.

* *

Software layers have various usages:

*

When the application is not using hardware acceleration, a software layer * is useful to apply a specific color filter and/or blending mode and/or * translucency to a view and all its children.

*

When the application is using hardware acceleration, a software layer * is useful to render drawing primitives not supported by the hardware * accelerated pipeline. It can also be used to cache a complex view tree * into a texture and reduce the complexity of drawing operations. For instance, * when animating a complex view tree with a translation, a software layer can * be used to render the view tree only once.

*

Software layers should be avoided when the affected view tree updates * often. Every update will require to re-render the software layer, which can * potentially be slow (particularly when hardware acceleration is turned on * since the layer will have to be uploaded into a hardware texture after every * update.)

* * @see #getLayerType() * @see #setLayerType(int, android.graphics.Paint) * @see #LAYER_TYPE_NONE * @see #LAYER_TYPE_HARDWARE */ public static final int LAYER_TYPE_SOFTWARE = 1; /** *

Indicates that the view has a hardware layer. A hardware layer is backed * by a hardware specific texture (generally Frame Buffer Objects or FBO on * OpenGL hardware) and causes the view to be rendered using Android's hardware * rendering pipeline, but only if hardware acceleration is turned on for the * view hierarchy. When hardware acceleration is turned off, hardware layers * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.

* *

A hardware layer is useful to apply a specific color filter and/or * blending mode and/or translucency to a view and all its children.

*

A hardware layer can be used to cache a complex view tree into a * texture and reduce the complexity of drawing operations. For instance, * when animating a complex view tree with a translation, a hardware layer can * be used to render the view tree only once.

*

A hardware layer can also be used to increase the rendering quality when * rotation transformations are applied on a view. It can also be used to * prevent potential clipping issues when applying 3D transforms on a view.

* * @see #getLayerType() * @see #setLayerType(int, android.graphics.Paint) * @see #LAYER_TYPE_NONE * @see #LAYER_TYPE_SOFTWARE */ public static final int LAYER_TYPE_HARDWARE = 2; @ViewDebug.ExportedProperty(category = "drawing", mapping = { @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") }) int mLayerType = LAYER_TYPE_NONE; Paint mLayerPaint; Rect mLocalDirtyRect; private HardwareLayer mHardwareLayer; /** * Set to true when drawing cache is enabled and cannot be created. * * @hide */ public boolean mCachingFailed; private Bitmap mDrawingCache; private Bitmap mUnscaledDrawingCache; DisplayList mDisplayList; /** * Set to true when the view is sending hover accessibility events because it * is the innermost hovered view. */ private boolean mSendingHoverAccessibilityEvents; /** * Delegate for injecting accessibility functionality. */ AccessibilityDelegate mAccessibilityDelegate; /** * The view's overlay layer. Developers get a reference to the overlay via getOverlay() * and add/remove objects to/from the overlay directly through the Overlay methods. */ ViewOverlay mOverlay; /** * Consistency verifier for debugging purposes. * @hide */ protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = InputEventConsistencyVerifier.isInstrumentationEnabled() ? new InputEventConsistencyVerifier(this, 0) : null; private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); /** * Simple constructor to use when creating a view from code. * * @param context The Context the view is running in, through which it can * access the current theme, resources, etc. */ public View(Context context) { mContext = context; mResources = context != null ? context.getResources() : null; mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; // Set some flags defaults mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); mUserPaddingStart = UNDEFINED_PADDING; mUserPaddingEnd = UNDEFINED_PADDING; if (!sCompatibilityDone && context != null) { final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; // Older apps may need this compatibility hack for measurement. sUseBrokenMakeMeasureSpec = targetSdkVersion <= JELLY_BEAN_MR1; // Older apps expect onMeasure() to always be called on a layout pass, regardless // of whether a layout was requested on that View. sIgnoreMeasureCache = targetSdkVersion < KITKAT; sCompatibilityDone = true; } } /** * Constructor that is called when inflating a view from XML. This is called * when a view is being constructed from an XML file, supplying attributes * that were specified in the XML file. This version uses a default style of * 0, so the only attribute values applied are those in the Context's Theme * and the given AttributeSet. * *

* The method onFinishInflate() will be called after all children have been * added. * * @param context The Context the view is running in, through which it can * access the current theme, resources, etc. * @param attrs The attributes of the XML tag that is inflating the view. * @see #View(Context, AttributeSet, int) */ public View(Context context, AttributeSet attrs) { this(context, attrs, 0); } /** * Perform inflation from XML and apply a class-specific base style. This * constructor of View allows subclasses to use their own base style when * they are inflating. For example, a Button class's constructor would call * this version of the super class constructor and supply * R.attr.buttonStyle for defStyle; this allows * the theme's button style to modify all of the base view attributes (in * particular its background) as well as the Button class's attributes. * * @param context The Context the view is running in, through which it can * access the current theme, resources, etc. * @param attrs The attributes of the XML tag that is inflating the view. * @param defStyleAttr An attribute in the current theme that contains a * reference to a style resource to apply to this view. If 0, no * default style will be applied. * @see #View(Context, AttributeSet) */ public View(Context context, AttributeSet attrs, int defStyleAttr) { this(context); TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, defStyleAttr, 0); Drawable background = null; int leftPadding = -1; int topPadding = -1; int rightPadding = -1; int bottomPadding = -1; int startPadding = UNDEFINED_PADDING; int endPadding = UNDEFINED_PADDING; int padding = -1; int viewFlagValues = 0; int viewFlagMasks = 0; boolean setScrollContainer = false; int x = 0; int y = 0; float tx = 0; float ty = 0; float rotation = 0; float rotationX = 0; float rotationY = 0; float sx = 1f; float sy = 1f; boolean transformSet = false; int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; int overScrollMode = mOverScrollMode; boolean initializeScrollbars = false; boolean startPaddingDefined = false; boolean endPaddingDefined = false; boolean leftPaddingDefined = false; boolean rightPaddingDefined = false; final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; final int N = a.getIndexCount(); for (int i = 0; i < N; i++) { int attr = a.getIndex(i); switch (attr) { case com.android.internal.R.styleable.View_background: background = a.getDrawable(attr); break; case com.android.internal.R.styleable.View_padding: padding = a.getDimensionPixelSize(attr, -1); mUserPaddingLeftInitial = padding; mUserPaddingRightInitial = padding; leftPaddingDefined = true; rightPaddingDefined = true; break; case com.android.internal.R.styleable.View_paddingLeft: leftPadding = a.getDimensionPixelSize(attr, -1); mUserPaddingLeftInitial = leftPadding; leftPaddingDefined = true; break; case com.android.internal.R.styleable.View_paddingTop: topPadding = a.getDimensionPixelSize(attr, -1); break; case com.android.internal.R.styleable.View_paddingRight: rightPadding = a.getDimensionPixelSize(attr, -1); mUserPaddingRightInitial = rightPadding; rightPaddingDefined = true; break; case com.android.internal.R.styleable.View_paddingBottom: bottomPadding = a.getDimensionPixelSize(attr, -1); break; case com.android.internal.R.styleable.View_paddingStart: startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); startPaddingDefined = (startPadding != UNDEFINED_PADDING); break; case com.android.internal.R.styleable.View_paddingEnd: endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); endPaddingDefined = (endPadding != UNDEFINED_PADDING); break; case com.android.internal.R.styleable.View_scrollX: x = a.getDimensionPixelOffset(attr, 0); break; case com.android.internal.R.styleable.View_scrollY: y = a.getDimensionPixelOffset(attr, 0); break; case com.android.internal.R.styleable.View_alpha: setAlpha(a.getFloat(attr, 1f)); break; case com.android.internal.R.styleable.View_transformPivotX: setPivotX(a.getDimensionPixelOffset(attr, 0)); break; case com.android.internal.R.styleable.View_transformPivotY: setPivotY(a.getDimensionPixelOffset(attr, 0)); break; case com.android.internal.R.styleable.View_translationX: tx = a.getDimensionPixelOffset(attr, 0); transformSet = true; break; case com.android.internal.R.styleable.View_translationY: ty = a.getDimensionPixelOffset(attr, 0); transformSet = true; break; case com.android.internal.R.styleable.View_rotation: rotation = a.getFloat(attr, 0); transformSet = true; break; case com.android.internal.R.styleable.View_rotationX: rotationX = a.getFloat(attr, 0); transformSet = true; break; case com.android.internal.R.styleable.View_rotationY: rotationY = a.getFloat(attr, 0); transformSet = true; break; case com.android.internal.R.styleable.View_scaleX: sx = a.getFloat(attr, 1f); transformSet = true; break; case com.android.internal.R.styleable.View_scaleY: sy = a.getFloat(attr, 1f); transformSet = true; break; case com.android.internal.R.styleable.View_id: mID = a.getResourceId(attr, NO_ID); break; case com.android.internal.R.styleable.View_tag: mTag = a.getText(attr); break; case com.android.internal.R.styleable.View_fitsSystemWindows: if (a.getBoolean(attr, false)) { viewFlagValues |= FITS_SYSTEM_WINDOWS; viewFlagMasks |= FITS_SYSTEM_WINDOWS; } break; case com.android.internal.R.styleable.View_focusable: if (a.getBoolean(attr, false)) { viewFlagValues |= FOCUSABLE; viewFlagMasks |= FOCUSABLE_MASK; } break; case com.android.internal.R.styleable.View_focusableInTouchMode: if (a.getBoolean(attr, false)) { viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; } break; case com.android.internal.R.styleable.View_clickable: if (a.getBoolean(attr, false)) { viewFlagValues |= CLICKABLE; viewFlagMasks |= CLICKABLE; } break; case com.android.internal.R.styleable.View_longClickable: if (a.getBoolean(attr, false)) { viewFlagValues |= LONG_CLICKABLE; viewFlagMasks |= LONG_CLICKABLE; } break; case com.android.internal.R.styleable.View_saveEnabled: if (!a.getBoolean(attr, true)) { viewFlagValues |= SAVE_DISABLED; viewFlagMasks |= SAVE_DISABLED_MASK; } break; case com.android.internal.R.styleable.View_duplicateParentState: if (a.getBoolean(attr, false)) { viewFlagValues |= DUPLICATE_PARENT_STATE; viewFlagMasks |= DUPLICATE_PARENT_STATE; } break; case com.android.internal.R.styleable.View_visibility: final int visibility = a.getInt(attr, 0); if (visibility != 0) { viewFlagValues |= VISIBILITY_FLAGS[visibility]; viewFlagMasks |= VISIBILITY_MASK; } break; case com.android.internal.R.styleable.View_layoutDirection: // Clear any layout direction flags (included resolved bits) already set mPrivateFlags2 &= ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); // Set the layout direction flags depending on the value of the attribute final int layoutDirection = a.getInt(attr, -1); final int value = (layoutDirection != -1) ? LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); break; case com.android.internal.R.styleable.View_drawingCacheQuality: final int cacheQuality = a.getInt(attr, 0); if (cacheQuality != 0) { viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; } break; case com.android.internal.R.styleable.View_contentDescription: setContentDescription(a.getString(attr)); break; case com.android.internal.R.styleable.View_labelFor: setLabelFor(a.getResourceId(attr, NO_ID)); break; case com.android.internal.R.styleable.View_soundEffectsEnabled: if (!a.getBoolean(attr, true)) { viewFlagValues &= ~SOUND_EFFECTS_ENABLED; viewFlagMasks |= SOUND_EFFECTS_ENABLED; } break; case com.android.internal.R.styleable.View_hapticFeedbackEnabled: if (!a.getBoolean(attr, true)) { viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; } break; case R.styleable.View_scrollbars: final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); if (scrollbars != SCROLLBARS_NONE) { viewFlagValues |= scrollbars; viewFlagMasks |= SCROLLBARS_MASK; initializeScrollbars = true; } break; //noinspection deprecation case R.styleable.View_fadingEdge: if (targetSdkVersion >= ICE_CREAM_SANDWICH) { // Ignore the attribute starting with ICS break; } // With builds < ICS, fall through and apply fading edges case R.styleable.View_requiresFadingEdge: final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); if (fadingEdge != FADING_EDGE_NONE) { viewFlagValues |= fadingEdge; viewFlagMasks |= FADING_EDGE_MASK; initializeFadingEdge(a); } break; case R.styleable.View_scrollbarStyle: scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; viewFlagMasks |= SCROLLBARS_STYLE_MASK; } break; case R.styleable.View_isScrollContainer: setScrollContainer = true; if (a.getBoolean(attr, false)) { setScrollContainer(true); } break; case com.android.internal.R.styleable.View_keepScreenOn: if (a.getBoolean(attr, false)) { viewFlagValues |= KEEP_SCREEN_ON; viewFlagMasks |= KEEP_SCREEN_ON; } break; case R.styleable.View_filterTouchesWhenObscured: if (a.getBoolean(attr, false)) { viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; } break; case R.styleable.View_nextFocusLeft: mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); break; case R.styleable.View_nextFocusRight: mNextFocusRightId = a.getResourceId(attr, View.NO_ID); break; case R.styleable.View_nextFocusUp: mNextFocusUpId = a.getResourceId(attr, View.NO_ID); break; case R.styleable.View_nextFocusDown: mNextFocusDownId = a.getResourceId(attr, View.NO_ID); break; case R.styleable.View_nextFocusForward: mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); break; case R.styleable.View_minWidth: mMinWidth = a.getDimensionPixelSize(attr, 0); break; case R.styleable.View_minHeight: mMinHeight = a.getDimensionPixelSize(attr, 0); break; case R.styleable.View_onClick: if (context.isRestricted()) { throw new IllegalStateException("The android:onClick attribute cannot " + "be used within a restricted context"); } final String handlerName = a.getString(attr); if (handlerName != null) { setOnClickListener(new OnClickListener() { private Method mHandler; public void onClick(View v) { if (mHandler == null) { try { mHandler = getContext().getClass().getMethod(handlerName, View.class); } catch (NoSuchMethodException e) { int id = getId(); String idText = id == NO_ID ? "" : " with id '" + getContext().getResources().getResourceEntryName( id) + "'"; throw new IllegalStateException("Could not find a method " + handlerName + "(View) in the activity " + getContext().getClass() + " for onClick handler" + " on view " + View.this.getClass() + idText, e); } } try { mHandler.invoke(getContext(), View.this); } catch (IllegalAccessException e) { throw new IllegalStateException("Could not execute non " + "public method of the activity", e); } catch (InvocationTargetException e) { throw new IllegalStateException("Could not execute " + "method of the activity", e); } } }); } break; case R.styleable.View_overScrollMode: overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); break; case R.styleable.View_verticalScrollbarPosition: mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); break; case R.styleable.View_layerType: setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); break; case R.styleable.View_textDirection: // Clear any text direction flag already set mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; // Set the text direction flags depending on the value of the attribute final int textDirection = a.getInt(attr, -1); if (textDirection != -1) { mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; } break; case R.styleable.View_textAlignment: // Clear any text alignment flag already set mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; // Set the text alignment flag depending on the value of the attribute final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; break; case R.styleable.View_importantForAccessibility: setImportantForAccessibility(a.getInt(attr, IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); break; case R.styleable.View_accessibilityLiveRegion: setAccessibilityLiveRegion(a.getInt(attr, ACCESSIBILITY_LIVE_REGION_DEFAULT)); break; } } setOverScrollMode(overScrollMode); // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet // the resolved layout direction). Those cached values will be used later during padding // resolution. mUserPaddingStart = startPadding; mUserPaddingEnd = endPadding; if (background != null) { setBackground(background); } // setBackground above will record that padding is currently provided by the background. // If we have padding specified via xml, record that here instead and use it. mLeftPaddingDefined = leftPaddingDefined; mRightPaddingDefined = rightPaddingDefined; if (padding >= 0) { leftPadding = padding; topPadding = padding; rightPadding = padding; bottomPadding = padding; mUserPaddingLeftInitial = padding; mUserPaddingRightInitial = padding; } if (isRtlCompatibilityMode()) { // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. // left / right padding are used if defined (meaning here nothing to do). If they are not // defined and start / end padding are defined (e.g. in Frameworks resources), then we use // start / end and resolve them as left / right (layout direction is not taken into account). // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if // defined. if (!mLeftPaddingDefined && startPaddingDefined) { leftPadding = startPadding; } mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; if (!mRightPaddingDefined && endPaddingDefined) { rightPadding = endPadding; } mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; } else { // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right // values defined. Otherwise, left /right values are used. // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if // defined. final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined; if (mLeftPaddingDefined && !hasRelativePadding) { mUserPaddingLeftInitial = leftPadding; } if (mRightPaddingDefined && !hasRelativePadding) { mUserPaddingRightInitial = rightPadding; } } internalSetPadding( mUserPaddingLeftInitial, topPadding >= 0 ? topPadding : mPaddingTop, mUserPaddingRightInitial, bottomPadding >= 0 ? bottomPadding : mPaddingBottom); if (viewFlagMasks != 0) { setFlags(viewFlagValues, viewFlagMasks); } if (initializeScrollbars) { initializeScrollbars(a); } a.recycle(); // Needs to be called after mViewFlags is set if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { recomputePadding(); } if (x != 0 || y != 0) { scrollTo(x, y); } if (transformSet) { setTranslationX(tx); setTranslationY(ty); setRotation(rotation); setRotationX(rotationX); setRotationY(rotationY); setScaleX(sx); setScaleY(sy); } if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { setScrollContainer(true); } computeOpaqueFlags(); } /** * Non-public constructor for use in testing */ View() { mResources = null; } public String toString() { StringBuilder out = new StringBuilder(128); out.append(getClass().getName()); out.append('{'); out.append(Integer.toHexString(System.identityHashCode(this))); out.append(' '); switch (mViewFlags&VISIBILITY_MASK) { case VISIBLE: out.append('V'); break; case INVISIBLE: out.append('I'); break; case GONE: out.append('G'); break; default: out.append('.'); break; } out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); out.append(' '); out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { out.append('p'); } else { out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); } out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); out.append(' '); out.append(mLeft); out.append(','); out.append(mTop); out.append('-'); out.append(mRight); out.append(','); out.append(mBottom); final int id = getId(); if (id != NO_ID) { out.append(" #"); out.append(Integer.toHexString(id)); final Resources r = mResources; if (id != 0 && r != null) { try { String pkgname; switch (id&0xff000000) { case 0x7f000000: pkgname="app"; break; case 0x01000000: pkgname="android"; break; default: pkgname = r.getResourcePackageName(id); break; } String typename = r.getResourceTypeName(id); String entryname = r.getResourceEntryName(id); out.append(" "); out.append(pkgname); out.append(":"); out.append(typename); out.append("/"); out.append(entryname); } catch (Resources.NotFoundException e) { } } } out.append("}"); return out.toString(); } /** *

* Initializes the fading edges from a given set of styled attributes. This * method should be called by subclasses that need fading edges and when an * instance of these subclasses is created programmatically rather than * being inflated from XML. This method is automatically called when the XML * is inflated. *

* * @param a the styled attributes set to initialize the fading edges from */ protected void initializeFadingEdge(TypedArray a) { initScrollCache(); mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( R.styleable.View_fadingEdgeLength, ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); } /** * Returns the size of the vertical faded edges used to indicate that more * content in this view is visible. * * @return The size in pixels of the vertical faded edge or 0 if vertical * faded edges are not enabled for this view. * @attr ref android.R.styleable#View_fadingEdgeLength */ public int getVerticalFadingEdgeLength() { if (isVerticalFadingEdgeEnabled()) { ScrollabilityCache cache = mScrollCache; if (cache != null) { return cache.fadingEdgeLength; } } return 0; } /** * Set the size of the faded edge used to indicate that more content in this * view is available. Will not change whether the fading edge is enabled; use * {@link #setVerticalFadingEdgeEnabled(boolean)} or * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge * for the vertical or horizontal fading edges. * * @param length The size in pixels of the faded edge used to indicate that more * content in this view is visible. */ public void setFadingEdgeLength(int length) { initScrollCache(); mScrollCache.fadingEdgeLength = length; } /** * Returns the size of the horizontal faded edges used to indicate that more * content in this view is visible. * * @return The size in pixels of the horizontal faded edge or 0 if horizontal * faded edges are not enabled for this view. * @attr ref android.R.styleable#View_fadingEdgeLength */ public int getHorizontalFadingEdgeLength() { if (isHorizontalFadingEdgeEnabled()) { ScrollabilityCache cache = mScrollCache; if (cache != null) { return cache.fadingEdgeLength; } } return 0; } /** * Returns the width of the vertical scrollbar. * * @return The width in pixels of the vertical scrollbar or 0 if there * is no vertical scrollbar. */ public int getVerticalScrollbarWidth() { ScrollabilityCache cache = mScrollCache; if (cache != null) { ScrollBarDrawable scrollBar = cache.scrollBar; if (scrollBar != null) { int size = scrollBar.getSize(true); if (size <= 0) { size = cache.scrollBarSize; } return size; } return 0; } return 0; } /** * Returns the height of the horizontal scrollbar. * * @return The height in pixels of the horizontal scrollbar or 0 if * there is no horizontal scrollbar. */ protected int getHorizontalScrollbarHeight() { ScrollabilityCache cache = mScrollCache; if (cache != null) { ScrollBarDrawable scrollBar = cache.scrollBar; if (scrollBar != null) { int size = scrollBar.getSize(false); if (size <= 0) { size = cache.scrollBarSize; } return size; } return 0; } return 0; } /** *

* Initializes the scrollbars from a given set of styled attributes. This * method should be called by subclasses that need scrollbars and when an * instance of these subclasses is created programmatically rather than * being inflated from XML. This method is automatically called when the XML * is inflated. *

* * @param a the styled attributes set to initialize the scrollbars from */ protected void initializeScrollbars(TypedArray a) { initScrollCache(); final ScrollabilityCache scrollabilityCache = mScrollCache; if (scrollabilityCache.scrollBar == null) { scrollabilityCache.scrollBar = new ScrollBarDrawable(); } final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); if (!fadeScrollbars) { scrollabilityCache.state = ScrollabilityCache.ON; } scrollabilityCache.fadeScrollBars = fadeScrollbars; scrollabilityCache.scrollBarFadeDuration = a.getInt( R.styleable.View_scrollbarFadeDuration, ViewConfiguration .getScrollBarFadeDuration()); scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( R.styleable.View_scrollbarDefaultDelayBeforeFade, ViewConfiguration.getScrollDefaultDelay()); scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( com.android.internal.R.styleable.View_scrollbarSize, ViewConfiguration.get(mContext).getScaledScrollBarSize()); Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); if (thumb != null) { scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); } boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, false); if (alwaysDraw) { scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); } track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); if (thumb != null) { scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); } alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, false); if (alwaysDraw) { scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); } // Apply layout direction to the new Drawables if needed final int layoutDirection = getLayoutDirection(); if (track != null) { track.setLayoutDirection(layoutDirection); } if (thumb != null) { thumb.setLayoutDirection(layoutDirection); } // Re-apply user/background padding so that scrollbar(s) get added resolvePadding(); } /** *

* Initalizes the scrollability cache if necessary. *

*/ private void initScrollCache() { if (mScrollCache == null) { mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); } } private ScrollabilityCache getScrollCache() { initScrollCache(); return mScrollCache; } /** * Set the position of the vertical scroll bar. Should be one of * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or * {@link #SCROLLBAR_POSITION_RIGHT}. * * @param position Where the vertical scroll bar should be positioned. */ public void setVerticalScrollbarPosition(int position) { if (mVerticalScrollbarPosition != position) { mVerticalScrollbarPosition = position; computeOpaqueFlags(); resolvePadding(); } } /** * @return The position where the vertical scroll bar will show, if applicable. * @see #setVerticalScrollbarPosition(int) */ public int getVerticalScrollbarPosition() { return mVerticalScrollbarPosition; } ListenerInfo getListenerInfo() { if (mListenerInfo != null) { return mListenerInfo; } mListenerInfo = new ListenerInfo(); return mListenerInfo; } /** * Register a callback to be invoked when focus of this view changed. * * @param l The callback that will run. */ public void setOnFocusChangeListener(OnFocusChangeListener l) { getListenerInfo().mOnFocusChangeListener = l; } /** * Add a listener that will be called when the bounds of the view change due to * layout processing. * * @param listener The listener that will be called when layout bounds change. */ public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { ListenerInfo li = getListenerInfo(); if (li.mOnLayoutChangeListeners == null) { li.mOnLayoutChangeListeners = new ArrayList(); } if (!li.mOnLayoutChangeListeners.contains(listener)) { li.mOnLayoutChangeListeners.add(listener); } } /** * Remove a listener for layout changes. * * @param listener The listener for layout bounds change. */ public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { ListenerInfo li = mListenerInfo; if (li == null || li.mOnLayoutChangeListeners == null) { return; } li.mOnLayoutChangeListeners.remove(listener); } /** * Add a listener for attach state changes. * * This listener will be called whenever this view is attached or detached * from a window. Remove the listener using * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. * * @param listener Listener to attach * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) */ public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { ListenerInfo li = getListenerInfo(); if (li.mOnAttachStateChangeListeners == null) { li.mOnAttachStateChangeListeners = new CopyOnWriteArrayList(); } li.mOnAttachStateChangeListeners.add(listener); } /** * Remove a listener for attach state changes. The listener will receive no further * notification of window attach/detach events. * * @param listener Listener to remove * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) */ public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { ListenerInfo li = mListenerInfo; if (li == null || li.mOnAttachStateChangeListeners == null) { return; } li.mOnAttachStateChangeListeners.remove(listener); } /** * Returns the focus-change callback registered for this view. * * @return The callback, or null if one is not registered. */ public OnFocusChangeListener getOnFocusChangeListener() { ListenerInfo li = mListenerInfo; return li != null ? li.mOnFocusChangeListener : null; } /** * Register a callback to be invoked when this view is clicked. If this view is not * clickable, it becomes clickable. * * @param l The callback that will run * * @see #setClickable(boolean) */ public void setOnClickListener(OnClickListener l) { if (!isClickable()) { setClickable(true); } getListenerInfo().mOnClickListener = l; } /** * Return whether this view has an attached OnClickListener. Returns * true if there is a listener, false if there is none. */ public boolean hasOnClickListeners() { ListenerInfo li = mListenerInfo; return (li != null && li.mOnClickListener != null); } /** * Register a callback to be invoked when this view is clicked and held. If this view is not * long clickable, it becomes long clickable. * * @param l The callback that will run * * @see #setLongClickable(boolean) */ public void setOnLongClickListener(OnLongClickListener l) { if (!isLongClickable()) { setLongClickable(true); } getListenerInfo().mOnLongClickListener = l; } /** * Register a callback to be invoked when the context menu for this view is * being built. If this view is not long clickable, it becomes long clickable. * * @param l The callback that will run * */ public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { if (!isLongClickable()) { setLongClickable(true); } getListenerInfo().mOnCreateContextMenuListener = l; } /** * Call this view's OnClickListener, if it is defined. Performs all normal * actions associated with clicking: reporting accessibility event, playing * a sound, etc. * * @return True there was an assigned OnClickListener that was called, false * otherwise is returned. */ public boolean performClick() { sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); ListenerInfo li = mListenerInfo; if (li != null && li.mOnClickListener != null) { playSoundEffect(SoundEffectConstants.CLICK); li.mOnClickListener.onClick(this); return true; } return false; } /** * Directly call any attached OnClickListener. Unlike {@link #performClick()}, * this only calls the listener, and does not do any associated clicking * actions like reporting an accessibility event. * * @return True there was an assigned OnClickListener that was called, false * otherwise is returned. */ public boolean callOnClick() { ListenerInfo li = mListenerInfo; if (li != null && li.mOnClickListener != null) { li.mOnClickListener.onClick(this); return true; } return false; } /** * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the * OnLongClickListener did not consume the event. * * @return True if one of the above receivers consumed the event, false otherwise. */ public boolean performLongClick() { sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); boolean handled = false; ListenerInfo li = mListenerInfo; if (li != null && li.mOnLongClickListener != null) { handled = li.mOnLongClickListener.onLongClick(View.this); } if (!handled) { handled = showContextMenu(); } if (handled) { performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); } return handled; } /** * Performs button-related actions during a touch down event. * * @param event The event. * @return True if the down was consumed. * * @hide */ protected boolean performButtonActionOnTouchDown(MotionEvent event) { if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { return true; } } return false; } /** * Bring up the context menu for this view. * * @return Whether a context menu was displayed. */ public boolean showContextMenu() { return getParent().showContextMenuForChild(this); } /** * Bring up the context menu for this view, referring to the item under the specified point. * * @param x The referenced x coordinate. * @param y The referenced y coordinate. * @param metaState The keyboard modifiers that were pressed. * @return Whether a context menu was displayed. * * @hide */ public boolean showContextMenu(float x, float y, int metaState) { return showContextMenu(); } /** * Start an action mode. * * @param callback Callback that will control the lifecycle of the action mode * @return The new action mode if it is started, null otherwise * * @see ActionMode */ public ActionMode startActionMode(ActionMode.Callback callback) { ViewParent parent = getParent(); if (parent == null) return null; return parent.startActionModeForChild(this, callback); } /** * Register a callback to be invoked when a hardware key is pressed in this view. * Key presses in software input methods will generally not trigger the methods of * this listener. * @param l the key listener to attach to this view */ public void setOnKeyListener(OnKeyListener l) { getListenerInfo().mOnKeyListener = l; } /** * Register a callback to be invoked when a touch event is sent to this view. * @param l the touch listener to attach to this view */ public void setOnTouchListener(OnTouchListener l) { getListenerInfo().mOnTouchListener = l; } /** * Register a callback to be invoked when a generic motion event is sent to this view. * @param l the generic motion listener to attach to this view */ public void setOnGenericMotionListener(OnGenericMotionListener l) { getListenerInfo().mOnGenericMotionListener = l; } /** * Register a callback to be invoked when a hover event is sent to this view. * @param l the hover listener to attach to this view */ public void setOnHoverListener(OnHoverListener l) { getListenerInfo().mOnHoverListener = l; } /** * Register a drag event listener callback object for this View. The parameter is * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a * View, the system calls the * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. * @param l An implementation of {@link android.view.View.OnDragListener}. */ public void setOnDragListener(OnDragListener l) { getListenerInfo().mOnDragListener = l; } /** * Give this view focus. This will cause * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. * * Note: this does not check whether this {@link View} should get focus, it just * gives it focus no matter what. It should only be called internally by framework * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. * * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which * focus moved when requestFocus() is called. It may not always * apply, in which case use the default View.FOCUS_DOWN. * @param previouslyFocusedRect The rectangle of the view that had focus * prior in this View's coordinate system. */ void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { if (DBG) { System.out.println(this + " requestFocus()"); } if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { mPrivateFlags |= PFLAG_FOCUSED; View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; if (mParent != null) { mParent.requestChildFocus(this, this); } if (mAttachInfo != null) { mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); } onFocusChanged(true, direction, previouslyFocusedRect); refreshDrawableState(); } } /** * Request that a rectangle of this view be visible on the screen, * scrolling if necessary just enough. * *

A View should call this if it maintains some notion of which part * of its content is interesting. For example, a text editing view * should call this when its cursor moves. * * @param rectangle The rectangle. * @return Whether any parent scrolled. */ public boolean requestRectangleOnScreen(Rect rectangle) { return requestRectangleOnScreen(rectangle, false); } /** * Request that a rectangle of this view be visible on the screen, * scrolling if necessary just enough. * *

A View should call this if it maintains some notion of which part * of its content is interesting. For example, a text editing view * should call this when its cursor moves. * *

When immediate is set to true, scrolling will not be * animated. * * @param rectangle The rectangle. * @param immediate True to forbid animated scrolling, false otherwise * @return Whether any parent scrolled. */ public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { if (mParent == null) { return false; } View child = this; RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); position.set(rectangle); ViewParent parent = mParent; boolean scrolled = false; while (parent != null) { rectangle.set((int) position.left, (int) position.top, (int) position.right, (int) position.bottom); scrolled |= parent.requestChildRectangleOnScreen(child, rectangle, immediate); if (!child.hasIdentityMatrix()) { child.getMatrix().mapRect(position); } position.offset(child.mLeft, child.mTop); if (!(parent instanceof View)) { break; } View parentView = (View) parent; position.offset(-parentView.getScrollX(), -parentView.getScrollY()); child = parentView; parent = child.getParent(); } return scrolled; } /** * Called when this view wants to give up focus. If focus is cleared * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. *

* Note: When a View clears focus the framework is trying * to give focus to the first focusable View from the top. Hence, if this * View is the first from the top that can take focus, then all callbacks * related to clearing focus will be invoked after wich the framework will * give focus to this view. *

*/ public void clearFocus() { if (DBG) { System.out.println(this + " clearFocus()"); } clearFocusInternal(true, true); } /** * Clears focus from the view, optionally propagating the change up through * the parent hierarchy and requesting that the root view place new focus. * * @param propagate whether to propagate the change up through the parent * hierarchy * @param refocus when propagate is true, specifies whether to request the * root view place new focus */ void clearFocusInternal(boolean propagate, boolean refocus) { if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { mPrivateFlags &= ~PFLAG_FOCUSED; if (propagate && mParent != null) { mParent.clearChildFocus(this); } onFocusChanged(false, 0, null); refreshDrawableState(); if (propagate && (!refocus || !rootViewRequestFocus())) { notifyGlobalFocusCleared(this); } } } void notifyGlobalFocusCleared(View oldFocus) { if (oldFocus != null && mAttachInfo != null) { mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); } } boolean rootViewRequestFocus() { final View root = getRootView(); return root != null && root.requestFocus(); } /** * Called internally by the view system when a new view is getting focus. * This is what clears the old focus. *

* NOTE: The parent view's focused child must be updated manually * after calling this method. Otherwise, the view hierarchy may be left in * an inconstent state. */ void unFocus() { if (DBG) { System.out.println(this + " unFocus()"); } clearFocusInternal(false, false); } /** * Returns true if this view has focus iteself, or is the ancestor of the * view that has focus. * * @return True if this view has or contains focus, false otherwise. */ @ViewDebug.ExportedProperty(category = "focus") public boolean hasFocus() { return (mPrivateFlags & PFLAG_FOCUSED) != 0; } /** * Returns true if this view is focusable or if it contains a reachable View * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" * is a View whose parents do not block descendants focus. * * Only {@link #VISIBLE} views are considered focusable. * * @return True if the view is focusable or if the view contains a focusable * View, false otherwise. * * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS */ public boolean hasFocusable() { return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); } /** * Called by the view system when the focus state of this view changes. * When the focus change event is caused by directional navigation, direction * and previouslyFocusedRect provide insight into where the focus is coming from. * When overriding, be sure to call up through to the super class so that * the standard focus handling will occur. * * @param gainFocus True if the View has focus; false otherwise. * @param direction The direction focus has moved when requestFocus() * is called to give this view focus. Values are * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. * It may not always apply, in which case use the default. * @param previouslyFocusedRect The rectangle, in this view's coordinate * system, of the previously focused view. If applicable, this will be * passed in as finer grained information about where the focus is coming * from (in addition to direction). Will be null otherwise. */ protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { if (gainFocus) { sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); } else { notifyViewAccessibilityStateChangedIfNeeded( AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); } InputMethodManager imm = InputMethodManager.peekInstance(); if (!gainFocus) { if (isPressed()) { setPressed(false); } if (imm != null && mAttachInfo != null && mAttachInfo.mHasWindowFocus) { imm.focusOut(this); } onFocusLost(); } else if (imm != null && mAttachInfo != null && mAttachInfo.mHasWindowFocus) { imm.focusIn(this); } invalidate(true); ListenerInfo li = mListenerInfo; if (li != null && li.mOnFocusChangeListener != null) { li.mOnFocusChangeListener.onFocusChange(this, gainFocus); } if (mAttachInfo != null) { mAttachInfo.mKeyDispatchState.reset(this); } } /** * Sends an accessibility event of the given type. If accessibility is * not enabled this method has no effect. The default implementation calls * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first * to populate information about the event source (this View), then calls * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to * populate the text content of the event source including its descendants, * and last calls * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} * on its parent to resuest sending of the event to interested parties. *

* If an {@link AccessibilityDelegate} has been specified via calling * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is * responsible for handling this call. *

* * @param eventType The type of the event to send, as defined by several types from * {@link android.view.accessibility.AccessibilityEvent}, such as * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. * * @see #onInitializeAccessibilityEvent(AccessibilityEvent) * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) * @see AccessibilityDelegate */ public void sendAccessibilityEvent(int eventType) { // Excluded views do not send accessibility events. if (!includeForAccessibility()) { return; } if (mAccessibilityDelegate != null) { mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); } else { sendAccessibilityEventInternal(eventType); } } /** * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} * {@link AccessibilityEvent} to make an announcement which is related to some * sort of a context change for which none of the events representing UI transitions * is a good fit. For example, announcing a new page in a book. If accessibility * is not enabled this method does nothing. * * @param text The announcement text. */ public void announceForAccessibility(CharSequence text) { if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { AccessibilityEvent event = AccessibilityEvent.obtain( AccessibilityEvent.TYPE_ANNOUNCEMENT); onInitializeAccessibilityEvent(event); event.getText().add(text); event.setContentDescription(null); mParent.requestSendAccessibilityEvent(this, event); } } /** * @see #sendAccessibilityEvent(int) * * Note: Called from the default {@link AccessibilityDelegate}. */ void sendAccessibilityEventInternal(int eventType) { if (AccessibilityManager.getInstance(mContext).isEnabled()) { sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); } } /** * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but * takes as an argument an empty {@link AccessibilityEvent} and does not * perform a check whether accessibility is enabled. *

* If an {@link AccessibilityDelegate} has been specified via calling * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} * is responsible for handling this call. *

* * @param event The event to send. * * @see #sendAccessibilityEvent(int) */ public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { if (mAccessibilityDelegate != null) { mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); } else { sendAccessibilityEventUncheckedInternal(event); } } /** * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) * * Note: Called from the default {@link AccessibilityDelegate}. */ void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { if (!isShown()) { return; } onInitializeAccessibilityEvent(event); // Only a subset of accessibility events populates text content. if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { dispatchPopulateAccessibilityEvent(event); } // In the beginning we called #isShown(), so we know that getParent() is not null. getParent().requestSendAccessibilityEvent(this, event); } /** * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then * to its children for adding their text content to the event. Note that the * event text is populated in a separate dispatch path since we add to the * event not only the text of the source but also the text of all its descendants. * A typical implementation will call * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} * on each child. Override this method if custom population of the event text * content is required. *

* If an {@link AccessibilityDelegate} has been specified via calling * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} * is responsible for handling this call. *

*

* Note: Accessibility events of certain types are not dispatched for * populating the event text via this method. For details refer to {@link AccessibilityEvent}. *

* * @param event The event. * * @return True if the event population was completed. */ public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { if (mAccessibilityDelegate != null) { return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); } else { return dispatchPopulateAccessibilityEventInternal(event); } } /** * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) * * Note: Called from the default {@link AccessibilityDelegate}. */ boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { onPopulateAccessibilityEvent(event); return false; } /** * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} * giving a chance to this View to populate the accessibility event with its * text content. While this method is free to modify event * attributes other than text content, doing so should normally be performed in * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. *

* Example: Adding formatted date string to an accessibility event in addition * to the text added by the super implementation: *

 public void onPopulateAccessibilityEvent(AccessibilityEvent event) {     *     super.onPopulateAccessibilityEvent(event);     *     final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY;     *     String selectedDateUtterance = DateUtils.formatDateTime(mContext,     *         mCurrentDate.getTimeInMillis(), flags);     *     event.getText().add(selectedDateUtterance);     * }
*

* If an {@link AccessibilityDelegate} has been specified via calling * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} * is responsible for handling this call. *

*

Note: Always call the super implementation before adding * information to the event, in case the default implementation has basic information to add. *

* * @param event The accessibility event which to populate. * * @see #sendAccessibilityEvent(int) * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) */ public void onPopulateAccessibilityEvent(AccessibilityEvent event) { if (mAccessibilityDelegate != null) { mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); } else { onPopulateAccessibilityEventInternal(event); } } /** * @see #onPopulateAccessibilityEvent(AccessibilityEvent) * * Note: Called from the default {@link AccessibilityDelegate}. */ void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { } /** * Initializes an {@link AccessibilityEvent} with information about * this View which is the event source. In other words, the source of * an accessibility event is the view whose state change triggered firing * the event. *

* Example: Setting the password property of an event in addition * to properties set by the super implementation: *

 public void onInitializeAccessibilityEvent(AccessibilityEvent event) {     *     super.onInitializeAccessibilityEvent(event);     *     event.setPassword(true);     * }
*

* If an {@link AccessibilityDelegate} has been specified via calling * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} * is responsible for handling this call. *

*

Note: Always call the super implementation before adding * information to the event, in case the default implementation has basic information to add. *

* @param event The event to initialize. * * @see #sendAccessibilityEvent(int) * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) */ public void onInitializeAccessibilityEvent(AccessibilityEvent event) { if (mAccessibilityDelegate != null) { mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); } else { onInitializeAccessibilityEventInternal(event); } } /** * @see #onInitializeAccessibilityEvent(AccessibilityEvent) * * Note: Called from the default {@link AccessibilityDelegate}. */ void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { event.setSource(this); event.setClassName(View.class.getName()); event.setPackageName(getContext().getPackageName()); event.setEnabled(isEnabled()); event.setContentDescription(mContentDescription); switch (event.getEventType()) { case AccessibilityEvent.TYPE_VIEW_FOCUSED: { ArrayList focusablesTempList = (mAttachInfo != null) ? mAttachInfo.mTempArrayList : new ArrayList(); getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); event.setItemCount(focusablesTempList.size()); event.setCurrentItemIndex(focusablesTempList.indexOf(this)); if (mAttachInfo != null) { focusablesTempList.clear(); } } break; case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { CharSequence text = getIterableTextForAccessibility(); if (text != null && text.length() > 0) { event.setFromIndex(getAccessibilitySelectionStart()); event.setToIndex(getAccessibilitySelectionEnd()); event.setItemCount(text.length()); } } break; } } /** * Returns an {@link AccessibilityNodeInfo} representing this view from the * point of view of an {@link android.accessibilityservice.AccessibilityService}. * This method is responsible for obtaining an accessibility node info from a * pool of reusable instances and calling * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to * initialize the former. *

* Note: The client is responsible for recycling the obtained instance by calling * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. *

* * @return A populated {@link AccessibilityNodeInfo}. * * @see AccessibilityNodeInfo */ public AccessibilityNodeInfo createAccessibilityNodeInfo() { if (mAccessibilityDelegate != null) { return mAccessibilityDelegate.createAccessibilityNodeInfo(this); } else { return createAccessibilityNodeInfoInternal(); } } /** * @see #createAccessibilityNodeInfo() */ AccessibilityNodeInfo createAccessibilityNodeInfoInternal() { AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); if (provider != null) { return provider.createAccessibilityNodeInfo(View.NO_ID); } else { AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); onInitializeAccessibilityNodeInfo(info); return info; } } /** * Initializes an {@link AccessibilityNodeInfo} with information about this view. * The base implementation sets: *
    *
  • {@link AccessibilityNodeInfo#setParent(View)},
  • *
  • {@link AccessibilityNodeInfo#setBoundsInParent(Rect)},
  • *
  • {@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},
  • *
  • {@link AccessibilityNodeInfo#setPackageName(CharSequence)},
  • *
  • {@link AccessibilityNodeInfo#setClassName(CharSequence)},
  • *
  • {@link AccessibilityNodeInfo#setContentDescription(CharSequence)},
  • *
  • {@link AccessibilityNodeInfo#setEnabled(boolean)},
  • *
  • {@link AccessibilityNodeInfo#setClickable(boolean)},
  • *
  • {@link AccessibilityNodeInfo#setFocusable(boolean)},
  • *
  • {@link AccessibilityNodeInfo#setFocused(boolean)},
  • *
  • {@link AccessibilityNodeInfo#setLongClickable(boolean)},
  • *
  • {@link AccessibilityNodeInfo#setSelected(boolean)},
  • *
*

* Subclasses should override this method, call the super implementation, * and set additional attributes. *

*

* If an {@link AccessibilityDelegate} has been specified via calling * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} * is responsible for handling this call. *

* * @param info The instance to initialize. */ public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { if (mAccessibilityDelegate != null) { mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); } else { onInitializeAccessibilityNodeInfoInternal(info); } } /** * Gets the location of this view in screen coordintates. * * @param outRect The output location */ void getBoundsOnScreen(Rect outRect) { if (mAttachInfo == null) { return; } RectF position = mAttachInfo.mTmpTransformRect; position.set(0, 0, mRight - mLeft, mBottom - mTop); if (!hasIdentityMatrix()) { getMatrix().mapRect(position); } position.offset(mLeft, mTop); ViewParent parent = mParent; while (parent instanceof View) { View parentView = (View) parent; position.offset(-parentView.mScrollX, -parentView.mScrollY); if (!parentView.hasIdentityMatrix()) { parentView.getMatrix().mapRect(position); } position.offset(parentView.mLeft, parentView.mTop); parent = parentView.mParent; } if (parent instanceof ViewRootImpl) { ViewRootImpl viewRootImpl = (ViewRootImpl) parent; position.offset(0, -viewRootImpl.mCurScrollY); } position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); } /** * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) * * Note: Called from the default {@link AccessibilityDelegate}. */ void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { Rect bounds = mAttachInfo.mTmpInvalRect; getDrawingRect(bounds); info.setBoundsInParent(bounds); getBoundsOnScreen(bounds); info.setBoundsInScreen(bounds); ViewParent parent = getParentForAccessibility(); if (parent instanceof View) { info.setParent((View) parent); } if (mID != View.NO_ID) { View rootView = getRootView(); if (rootView == null) { rootView = this; } View label = rootView.findLabelForView(this, mID); if (label != null) { info.setLabeledBy(label); } if ((mAttachInfo.mAccessibilityFetchFlags & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 && Resources.resourceHasPackage(mID)) { try { String viewId = getResources().getResourceName(mID); info.setViewIdResourceName(viewId); } catch (Resources.NotFoundException nfe) { /* ignore */ } } } if (mLabelForId != View.NO_ID) { View rootView = getRootView(); if (rootView == null) { rootView = this; } View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); if (labeled != null) { info.setLabelFor(labeled); } } info.setVisibleToUser(isVisibleToUser()); info.setPackageName(mContext.getPackageName()); info.setClassName(View.class.getName()); info.setContentDescription(getContentDescription()); info.setEnabled(isEnabled()); info.setClickable(isClickable()); info.setFocusable(isFocusable()); info.setFocused(isFocused()); info.setAccessibilityFocused(isAccessibilityFocused()); info.setSelected(isSelected()); info.setLongClickable(isLongClickable()); info.setLiveRegion(getAccessibilityLiveRegion()); // TODO: These make sense only if we are in an AdapterView but all // views can be selected. Maybe from accessibility perspective // we should report as selectable view in an AdapterView. info.addAction(AccessibilityNodeInfo.ACTION_SELECT); info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); if (isFocusable()) { if (isFocused()) { info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); } else { info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); } } if (!isAccessibilityFocused()) { info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); } else { info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); } if (isClickable() && isEnabled()) { info.addAction(AccessibilityNodeInfo.ACTION_CLICK); } if (isLongClickable() && isEnabled()) { info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); } CharSequence text = getIterableTextForAccessibility(); if (text != null && text.length() > 0) { info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); } } private View findLabelForView(View view, int labeledId) { if (mMatchLabelForPredicate == null) { mMatchLabelForPredicate = new MatchLabelForPredicate(); } mMatchLabelForPredicate.mLabeledId = labeledId; return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); } /** * Computes whether this view is visible to the user. Such a view is * attached, visible, all its predecessors are visible, it is not clipped * entirely by its predecessors, and has an alpha greater than zero. * * @return Whether the view is visible on the screen. * * @hide */ protected boolean isVisibleToUser() { return isVisibleToUser(null); } /** * Computes whether the given portion of this view is visible to the user. * Such a view is attached, visible, all its predecessors are visible, * has an alpha greater than zero, and the specified portion is not * clipped entirely by its predecessors. * * @param boundInView the portion of the view to test; coordinates should be relative; may be * null, and the entire view will be tested in this case. * When true is returned by the function, the actual visible * region will be stored in this parameter; that is, if boundInView is fully * contained within the view, no modification will be made, otherwise regions * outside of the visible area of the view will be clipped. * * @return Whether the specified portion of the view is visible on the screen. * * @hide */ protected boolean isVisibleToUser(Rect boundInView) { if (mAttachInfo != null) { // Attached to invisible window means this view is not visible. if (mAttachInfo.mWindowVisibility != View.VISIBLE) { return false; } // An invisible predecessor or one with alpha zero means // that this view is not visible to the user. Object current = this; while (current instanceof View) { View view = (View) current; // We have attach info so this view is attached and there is no // need to check whether we reach to ViewRootImpl on the way up. if (view.getAlpha() <= 0 || view.getTransitionAlpha() <= 0 || view.getVisibility() != VISIBLE) { return false; } current = view.mParent; } // Check if the view is entirely covered by its predecessors. Rect visibleRect = mAttachInfo.mTmpInvalRect; Point offset = mAttachInfo.mPoint; if (!getGlobalVisibleRect(visibleRect, offset)) { return false; } // Check if the visible portion intersects the rectangle of interest. if (boundInView != null) { visibleRect.offset(-offset.x, -offset.y); return boundInView.intersect(visibleRect); } return true; } return false; } /** * Returns the delegate for implementing accessibility support via * composition. For more details see {@link AccessibilityDelegate}. * * @return The delegate, or null if none set. * * @hide */ public AccessibilityDelegate getAccessibilityDelegate() { return mAccessibilityDelegate; } /** * Sets a delegate for implementing accessibility support via composition as * opposed to inheritance. The delegate's primary use is for implementing * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. * * @param delegate The delegate instance. * * @see AccessibilityDelegate */ public void setAccessibilityDelegate(AccessibilityDelegate delegate) { mAccessibilityDelegate = delegate; } /** * Gets the provider for managing a virtual view hierarchy rooted at this View * and reported to {@link android.accessibilityservice.AccessibilityService}s * that explore the window content. *

* If this method returns an instance, this instance is responsible for managing * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this * View including the one representing the View itself. Similarly the returned * instance is responsible for performing accessibility actions on any virtual * view or the root view itself. *

*

* If an {@link AccessibilityDelegate} has been specified via calling * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} * is responsible for handling this call. *

* * @return The provider. * * @see AccessibilityNodeProvider */ public AccessibilityNodeProvider getAccessibilityNodeProvider() { if (mAccessibilityDelegate != null) { return mAccessibilityDelegate.getAccessibilityNodeProvider(this); } else { return null; } } /** * Gets the unique identifier of this view on the screen for accessibility purposes. * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. * * @return The view accessibility id. * * @hide */ public int getAccessibilityViewId() { if (mAccessibilityViewId == NO_ID) { mAccessibilityViewId = sNextAccessibilityViewId++; } return mAccessibilityViewId; } /** * Gets the unique identifier of the window in which this View reseides. * * @return The window accessibility id. * * @hide */ public int getAccessibilityWindowId() { return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; } /** * Gets the {@link View} description. It briefly describes the view and is * primarily used for accessibility support. Set this property to enable * better accessibility support for your application. This is especially * true for views that do not have textual representation (For example, * ImageButton). * * @return The content description. * * @attr ref android.R.styleable#View_contentDescription */ @ViewDebug.ExportedProperty(category = "accessibility") public CharSequence getContentDescription() { return mContentDescription; } /** * Sets the {@link View} description. It briefly describes the view and is * primarily used for accessibility support. Set this property to enable * better accessibility support for your application. This is especially * true for views that do not have textual representation (For example, * ImageButton). * * @param contentDescription The content description. * * @attr ref android.R.styleable#View_contentDescription */ @RemotableViewMethod public void setContentDescription(CharSequence contentDescription) { if (mContentDescription == null) { if (contentDescription == null) { return; } } else if (mContentDescription.equals(contentDescription)) { return; } mContentDescription = contentDescription; final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); notifySubtreeAccessibilityStateChangedIfNeeded(); } else { notifyViewAccessibilityStateChangedIfNeeded( AccessibilityEvent.CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION); } } /** * Gets the id of a view for which this view serves as a label for * accessibility purposes. * * @return The labeled view id. */ @ViewDebug.ExportedProperty(category = "accessibility") public int getLabelFor() { return mLabelForId; } /** * Sets the id of a view for which this view serves as a label for * accessibility purposes. * * @param id The labeled view id. */ @RemotableViewMethod public void setLabelFor(int id) { mLabelForId = id; if (mLabelForId != View.NO_ID && mID == View.NO_ID) { mID = generateViewId(); } } /** * Invoked whenever this view loses focus, either by losing window focus or by losing * focus within its window. This method can be used to clear any state tied to the * focus. For instance, if a button is held pressed with the trackball and the window * loses focus, this method can be used to cancel the press. * * Subclasses of View overriding this method should always call super.onFocusLost(). * * @see #onFocusChanged(boolean, int, android.graphics.Rect) * @see #onWindowFocusChanged(boolean) * * @hide pending API council approval */ protected void onFocusLost() { resetPressedState(); } private void resetPressedState() { if ((mViewFlags & ENABLED_MASK) == DISABLED) { return; } if (isPressed()) { setPressed(false); if (!mHasPerformedLongPress) { removeLongPressCallback(); } } } /** * Returns true if this view has focus * * @return True if this view has focus, false otherwise. */ @ViewDebug.ExportedProperty(category = "focus") public boolean isFocused() { return (mPrivateFlags & PFLAG_FOCUSED) != 0; } /** * Find the view in the hierarchy rooted at this view that currently has * focus. * * @return The view that currently has focus, or null if no focused view can * be found. */ public View findFocus() { return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; } /** * Indicates whether this view is one of the set of scrollable containers in * its window. * * @return whether this view is one of the set of scrollable containers in * its window * * @attr ref android.R.styleable#View_isScrollContainer */ public boolean isScrollContainer() { return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; } /** * Change whether this view is one of the set of scrollable containers in * its window. This will be used to determine whether the window can * resize or must pan when a soft input area is open -- scrollable * containers allow the window to use resize mode since the container * will appropriately shrink. * * @attr ref android.R.styleable#View_isScrollContainer */ public void setScrollContainer(boolean isScrollContainer) { if (isScrollContainer) { if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { mAttachInfo.mScrollContainers.add(this); mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; } mPrivateFlags |= PFLAG_SCROLL_CONTAINER; } else { if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { mAttachInfo.mScrollContainers.remove(this); } mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); } } /** * Returns the quality of the drawing cache. * * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} * * @see #setDrawingCacheQuality(int) * @see #setDrawingCacheEnabled(boolean) * @see #isDrawingCacheEnabled() * * @attr ref android.R.styleable#View_drawingCacheQuality */ public int getDrawingCacheQuality() { return mViewFlags & DRAWING_CACHE_QUALITY_MASK; } /** * Set the drawing cache quality of this view. This value is used only when the * drawing cache is enabled * * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} * * @see #getDrawingCacheQuality() * @see #setDrawingCacheEnabled(boolean) * @see #isDrawingCacheEnabled() * * @attr ref android.R.styleable#View_drawingCacheQuality */ public void setDrawingCacheQuality(int quality) { setFlags(quality, DRAWING_CACHE_QUALITY_MASK); } /** * Returns whether the screen should remain on, corresponding to the current * value of {@link #KEEP_SCREEN_ON}. * * @return Returns true if {@link #KEEP_SCREEN_ON} is set. * * @see #setKeepScreenOn(boolean) * * @attr ref android.R.styleable#View_keepScreenOn */ public boolean getKeepScreenOn() { return (mViewFlags & KEEP_SCREEN_ON) != 0; } /** * Controls whether the screen should remain on, modifying the * value of {@link #KEEP_SCREEN_ON}. * * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. * * @see #getKeepScreenOn() * * @attr ref android.R.styleable#View_keepScreenOn */ public void setKeepScreenOn(boolean keepScreenOn) { setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); } /** * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. * * @attr ref android.R.styleable#View_nextFocusLeft */ public int getNextFocusLeftId() { return mNextFocusLeftId; } /** * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should * decide automatically. * * @attr ref android.R.styleable#View_nextFocusLeft */ public void setNextFocusLeftId(int nextFocusLeftId) { mNextFocusLeftId = nextFocusLeftId; } /** * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. * * @attr ref android.R.styleable#View_nextFocusRight */ public int getNextFocusRightId() { return mNextFocusRightId; } /** * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should * decide automatically. * * @attr ref android.R.styleable#View_nextFocusRight */ public void setNextFocusRightId(int nextFocusRightId) { mNextFocusRightId = nextFocusRightId; } /** * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. * * @attr ref android.R.styleable#View_nextFocusUp */ public int getNextFocusUpId() { return mNextFocusUpId; } /** * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should * decide automatically. * * @attr ref android.R.styleable#View_nextFocusUp */ public void setNextFocusUpId(int nextFocusUpId) { mNextFocusUpId = nextFocusUpId; } /** * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. * * @attr ref android.R.styleable#View_nextFocusDown */ public int getNextFocusDownId() { return mNextFocusDownId; } /** * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should * decide automatically. * * @attr ref android.R.styleable#View_nextFocusDown */ public void setNextFocusDownId(int nextFocusDownId) { mNextFocusDownId = nextFocusDownId; } /** * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. * * @attr ref android.R.styleable#View_nextFocusForward */ public int getNextFocusForwardId() { return mNextFocusForwardId; } /** * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should * decide automatically. * * @attr ref android.R.styleable#View_nextFocusForward */ public void setNextFocusForwardId(int nextFocusForwardId) { mNextFocusForwardId = nextFocusForwardId; } /** * Returns the visibility of this view and all of its ancestors * * @return True if this view and all of its ancestors are {@link #VISIBLE} */ public boolean isShown() { View current = this; //noinspection ConstantConditions do { if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { return false; } ViewParent parent = current.mParent; if (parent == null) { return false; // We are not attached to the view root } if (!(parent instanceof View)) { return true; } current = (View) parent; } while (current != null); return false; } /** * Called by the view hierarchy when the content insets for a window have * changed, to allow it to adjust its content to fit within those windows. * The content insets tell you the space that the status bar, input method, * and other system windows infringe on the application's window. * *

You do not normally need to deal with this function, since the default * window decoration given to applications takes care of applying it to the * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, * and your content can be placed under those system elements. You can then * use this method within your view hierarchy if you have parts of your UI * which you would like to ensure are not being covered. * *

The default implementation of this method simply applies the content * insets to the view's padding, consuming that content (modifying the * insets to be 0), and returning true. This behavior is off by default, but can * be enabled through {@link #setFitsSystemWindows(boolean)}. * *

This function's traversal down the hierarchy is depth-first. The same content * insets object is propagated down the hierarchy, so any changes made to it will * be seen by all following views (including potentially ones above in * the hierarchy since this is a depth-first traversal). The first view * that returns true will abort the entire traversal. * *

The default implementation works well for a situation where it is * used with a container that covers the entire window, allowing it to * apply the appropriate insets to its content on all edges. If you need * a more complicated layout (such as two different views fitting system * windows, one on the top of the window, and one on the bottom), * you can override the method and handle the insets however you would like. * Note that the insets provided by the framework are always relative to the * far edges of the window, not accounting for the location of the called view * within that window. (In fact when this method is called you do not yet know * where the layout will place the view, as it is done before layout happens.) * *

Note: unlike many View methods, there is no dispatch phase to this * call. If you are overriding it in a ViewGroup and want to allow the * call to continue to your children, you must be sure to call the super * implementation. * *

Here is a sample layout that makes use of fitting system windows * to have controls for a video view placed inside of the window decorations * that it hides and shows. This can be used with code like the second * sample (video player) shown in {@link #setSystemUiVisibility(int)}. * * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} * * @param insets Current content insets of the window. Prior to * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify * the insets or else you and Android will be unhappy. * * @return {@code true} if this view applied the insets and it should not * continue propagating further down the hierarchy, {@code false} otherwise. * @see #getFitsSystemWindows() * @see #setFitsSystemWindows(boolean) * @see #setSystemUiVisibility(int) */ protected boolean fitSystemWindows(Rect insets) { if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { mUserPaddingStart = UNDEFINED_PADDING; mUserPaddingEnd = UNDEFINED_PADDING; Rect localInsets = sThreadLocal.get(); if (localInsets == null) { localInsets = new Rect(); sThreadLocal.set(localInsets); } boolean res = computeFitSystemWindows(insets, localInsets); mUserPaddingLeftInitial = localInsets.left; mUserPaddingRightInitial = localInsets.right; internalSetPadding(localInsets.left, localInsets.top, localInsets.right, localInsets.bottom); return res; } return false; } /** * @hide Compute the insets that should be consumed by this view and the ones * that should propagate to those under it. */ protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 || mAttachInfo == null || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 && !mAttachInfo.mOverscanRequested)) { outLocalInsets.set(inoutInsets); inoutInsets.set(0, 0, 0, 0); return true; } else { // The application wants to take care of fitting system window for // the content... however we still need to take care of any overscan here. final Rect overscan = mAttachInfo.mOverscanInsets; outLocalInsets.set(overscan); inoutInsets.left -= overscan.left; inoutInsets.top -= overscan.top; inoutInsets.right -= overscan.right; inoutInsets.bottom -= overscan.bottom; return false; } } /** * Sets whether or not this view should account for system screen decorations * such as the status bar and inset its content; that is, controlling whether * the default implementation of {@link #fitSystemWindows(Rect)} will be * executed. See that method for more details. * *

Note that if you are providing your own implementation of * {@link #fitSystemWindows(Rect)}, then there is no need to set this * flag to true -- your implementation will be overriding the default * implementation that checks this flag. * * @param fitSystemWindows If true, then the default implementation of * {@link #fitSystemWindows(Rect)} will be executed. * * @attr ref android.R.styleable#View_fitsSystemWindows * @see #getFitsSystemWindows() * @see #fitSystemWindows(Rect) * @see #setSystemUiVisibility(int) */ public void setFitsSystemWindows(boolean fitSystemWindows) { setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); } /** * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)} * will be executed. * * @return {@code true} if the default implementation of * {@link #fitSystemWindows(Rect)} will be executed. * * @attr ref android.R.styleable#View_fitsSystemWindows * @see #setFitsSystemWindows(boolean) * @see #fitSystemWindows(Rect) * @see #setSystemUiVisibility(int) */ public boolean getFitsSystemWindows() { return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; } /** @hide */ public boolean fitsSystemWindows() { return getFitsSystemWindows(); } /** * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. */ public void requestFitSystemWindows() { if (mParent != null) { mParent.requestFitSystemWindows(); } } /** * For use by PhoneWindow to make its own system window fitting optional. * @hide */ public void makeOptionalFitsSystemWindows() { setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); } /** * Returns the visibility status for this view. * * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. * @attr ref android.R.styleable#View_visibility */ @ViewDebug.ExportedProperty(mapping = { @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), @ViewDebug.IntToString(from = GONE, to = "GONE") }) public int getVisibility() { return mViewFlags & VISIBILITY_MASK; } /** * Set the enabled state of this view. * * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. * @attr ref android.R.styleable#View_visibility */ @RemotableViewMethod public void setVisibility(int visibility) { setFlags(visibility, VISIBILITY_MASK); if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); } /** * Returns the enabled status for this view. The interpretation of the * enabled state varies by subclass. * * @return True if this view is enabled, false otherwise. */ @ViewDebug.ExportedProperty public boolean isEnabled() { return (mViewFlags & ENABLED_MASK) == ENABLED; } /** * Set the enabled state of this view. The interpretation of the enabled * state varies by subclass. * * @param enabled True if this view is enabled, false otherwise. */ @RemotableViewMethod public void setEnabled(boolean enabled) { if (enabled == isEnabled()) return; setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); /* * The View most likely has to change its appearance, so refresh * the drawable state. */ refreshDrawableState(); // Invalidate too, since the default behavior for views is to be // be drawn at 50% alpha rather than to change the drawable. invalidate(true); if (!enabled) { cancelPendingInputEvents(); } } /** * Set whether this view can receive the focus. * * Setting this to false will also ensure that this view is not focusable * in touch mode. * * @param focusable If true, this view can receive the focus. * * @see #setFocusableInTouchMode(boolean) * @attr ref android.R.styleable#View_focusable */ public void setFocusable(boolean focusable) { if (!focusable) { setFlags(0, FOCUSABLE_IN_TOUCH_MODE); } setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); } /** * Set whether this view can receive focus while in touch mode. * * Setting this to true will also ensure that this view is focusable. * * @param focusableInTouchMode If true, this view can receive the focus while * in touch mode. * * @see #setFocusable(boolean) * @attr ref android.R.styleable#View_focusableInTouchMode */ public void setFocusableInTouchMode(boolean focusableInTouchMode) { // Focusable in touch mode should always be set before the focusable flag // otherwise, setting the focusable flag will trigger a focusableViewAvailable() // which, in touch mode, will not successfully request focus on this view // because the focusable in touch mode flag is not set setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); if (focusableInTouchMode) { setFlags(FOCUSABLE, FOCUSABLE_MASK); } } /** * Set whether this view should have sound effects enabled for events such as * clicking and touching. * *

You may wish to disable sound effects for a view if you already play sounds, * for instance, a dial key that plays dtmf tones. * * @param soundEffectsEnabled whether sound effects are enabled for this view. * @see #isSoundEffectsEnabled() * @see #playSoundEffect(int) * @attr ref android.R.styleable#View_soundEffectsEnabled */ public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); } /** * @return whether this view should have sound effects enabled for events such as * clicking and touching. * * @see #setSoundEffectsEnabled(boolean) * @see #playSoundEffect(int) * @attr ref android.R.styleable#View_soundEffectsEnabled */ @ViewDebug.ExportedProperty public boolean isSoundEffectsEnabled() { return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); } /** * Set whether this view should have haptic feedback for events such as * long presses. * *

You may wish to disable haptic feedback if your view already controls * its own haptic feedback. * * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. * @see #isHapticFeedbackEnabled() * @see #performHapticFeedback(int) * @attr ref android.R.styleable#View_hapticFeedbackEnabled */ public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); } /** * @return whether this view should have haptic feedback enabled for events * long presses. * * @see #setHapticFeedbackEnabled(boolean) * @see #performHapticFeedback(int) * @attr ref android.R.styleable#View_hapticFeedbackEnabled */ @ViewDebug.ExportedProperty public boolean isHapticFeedbackEnabled() { return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); } /** * Returns the layout direction for this view. * * @return One of {@link #LAYOUT_DIRECTION_LTR}, * {@link #LAYOUT_DIRECTION_RTL}, * {@link #LAYOUT_DIRECTION_INHERIT} or * {@link #LAYOUT_DIRECTION_LOCALE}. * * @attr ref android.R.styleable#View_layoutDirection * * @hide */ @ViewDebug.ExportedProperty(category = "layout", mapping = { @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") }) public int getRawLayoutDirection() { return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; } /** * Set the layout direction for this view. This will propagate a reset of layout direction * resolution to the view's children and resolve layout direction for this view. * * @param layoutDirection the layout direction to set. Should be one of: * * {@link #LAYOUT_DIRECTION_LTR}, * {@link #LAYOUT_DIRECTION_RTL}, * {@link #LAYOUT_DIRECTION_INHERIT}, * {@link #LAYOUT_DIRECTION_LOCALE}. * * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution * proceeds up the parent chain of the view to get the value. If there is no parent, then it * will return the default {@link #LAYOUT_DIRECTION_LTR}. * * @attr ref android.R.styleable#View_layoutDirection */ @RemotableViewMethod public void setLayoutDirection(int layoutDirection) { if (getRawLayoutDirection() != layoutDirection) { // Reset the current layout direction and the resolved one mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; resetRtlProperties(); // Set the new layout direction (filtered) mPrivateFlags2 |= ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); // We need to resolve all RTL properties as they all depend on layout direction resolveRtlPropertiesIfNeeded(); requestLayout(); invalidate(true); } } /** * Returns the resolved layout direction for this view. * * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. * * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. * * @attr ref android.R.styleable#View_layoutDirection */ @ViewDebug.ExportedProperty(category = "layout", mapping = { @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") }) public int getLayoutDirection() { final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; if (targetSdkVersion < JELLY_BEAN_MR1) { mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; return LAYOUT_DIRECTION_RESOLVED_DEFAULT; } return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; } /** * Indicates whether or not this view's layout is right-to-left. This is resolved from * layout attribute and/or the inherited value from the parent * * @return true if the layout is right-to-left. * * @hide */ @ViewDebug.ExportedProperty(category = "layout") public boolean isLayoutRtl() { return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); } /** * Indicates whether the view is currently tracking transient state that the * app should not need to concern itself with saving and restoring, but that * the framework should take special note to preserve when possible. * *

A view with transient state cannot be trivially rebound from an external * data source, such as an adapter binding item views in a list. This may be * because the view is performing an animation, tracking user selection * of content, or similar.

* * @return true if the view has transient state */ @ViewDebug.ExportedProperty(category = "layout") public boolean hasTransientState() { return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; } /** * Set whether this view is currently tracking transient state that the * framework should attempt to preserve when possible. This flag is reference counted, * so every call to setHasTransientState(true) should be paired with a later call * to setHasTransientState(false). * *

A view with transient state cannot be trivially rebound from an external * data source, such as an adapter binding item views in a list. This may be * because the view is performing an animation, tracking user selection * of content, or similar.

* * @param hasTransientState true if this view has transient state */ public void setHasTransientState(boolean hasTransientState) { mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : mTransientStateCount - 1; if (mTransientStateCount < 0) { mTransientStateCount = 0; Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + "unmatched pair of setHasTransientState calls"); } else if ((hasTransientState && mTransientStateCount == 1) || (!hasTransientState && mTransientStateCount == 0)) { // update flag if we've just incremented up from 0 or decremented down to 0 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); if (mParent != null) { try { mParent.childHasTransientStateChanged(this, hasTransientState); } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); } } } } /** * Returns true if this view is currently attached to a window. */ public boolean isAttachedToWindow() { return mAttachInfo != null; } /** * Returns true if this view has been through at least one layout since it * was last attached to or detached from a window. */ public boolean isLaidOut() { return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT; } /** * If this view doesn't do any drawing on its own, set this flag to * allow further optimizations. By default, this flag is not set on * View, but could be set on some View subclasses such as ViewGroup. * * Typically, if you override {@link #onDraw(android.graphics.Canvas)} * you should clear this flag. * * @param willNotDraw whether or not this View draw on its own */ public void setWillNotDraw(boolean willNotDraw) { setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); } /** * Returns whether or not this View draws on its own. * * @return true if this view has nothing to draw, false otherwise */ @ViewDebug.ExportedProperty(category = "drawing") public boolean willNotDraw() { return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; } /** * When a View's drawing cache is enabled, drawing is redirected to an * offscreen bitmap. Some views, like an ImageView, must be able to * bypass this mechanism if they already draw a single bitmap, to avoid * unnecessary usage of the memory. * * @param willNotCacheDrawing true if this view does not cache its * drawing, false otherwise */ public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); } /** * Returns whether or not this View can cache its drawing or not. * * @return true if this view does not cache its drawing, false otherwise */ @ViewDebug.ExportedProperty(category = "drawing") public boolean willNotCacheDrawing() { return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; } /** * Indicates whether this view reacts to click events or not. * * @return true if the view is clickable, false otherwise * * @see #setClickable(boolean) * @attr ref android.R.styleable#View_clickable */ @ViewDebug.ExportedProperty public boolean isClickable() { return (mViewFlags & CLICKABLE) == CLICKABLE; } /** * Enables or disables click events for this view. When a view * is clickable it will change its state to "pressed" on every click. * Subclasses should set the view clickable to visually react to * user's clicks. * * @param clickable true to make the view clickable, false otherwise * * @see #isClickable() * @attr ref android.R.styleable#View_clickable */ public void setClickable(boolean clickable) { setFlags(clickable ? CLICKABLE : 0, CLICKABLE); } /** * Indicates whether this view reacts to long click events or not. * * @return true if the view is long clickable, false otherwise * * @see #setLongClickable(boolean) * @attr ref android.R.styleable#View_longClickable */ public boolean isLongClickable() { return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; } /** * Enables or disables long click events for this view. When a view is long * clickable it reacts to the user holding down the button for a longer * duration than a tap. This event can either launch the listener or a * context menu. * * @param longClickable true to make the view long clickable, false otherwise * @see #isLongClickable() * @attr ref android.R.styleable#View_longClickable */ public void setLongClickable(boolean longClickable) { setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); } /** * Sets the pressed state for this view. * * @see #isClickable() * @see #setClickable(boolean) * * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts * the View's internal state from a previously set "pressed" state. */ public void setPressed(boolean pressed) { final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); if (pressed) { mPrivateFlags |= PFLAG_PRESSED; } else { mPrivateFlags &= ~PFLAG_PRESSED; } if (needsRefresh) { refreshDrawableState(); } dispatchSetPressed(pressed); } /** * Dispatch setPressed to all of this View's children. * * @see #setPressed(boolean) * * @param pressed The new pressed state */ protected void dispatchSetPressed(boolean pressed) { } /** * Indicates whether the view is currently in pressed state. Unless * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter * the pressed state. * * @see #setPressed(boolean) * @see #isClickable() * @see #setClickable(boolean) * * @return true if the view is currently pressed, false otherwise */ public boolean isPressed() { return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; } /** * Indicates whether this view will save its state (that is, * whether its {@link #onSaveInstanceState} method will be called). * * @return Returns true if the view state saving is enabled, else false. * * @see #setSaveEnabled(boolean) * @attr ref android.R.styleable#View_saveEnabled */ public boolean isSaveEnabled() { return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; } /** * Controls whether the saving of this view's state is * enabled (that is, whether its {@link #onSaveInstanceState} method * will be called). Note that even if freezing is enabled, the * view still must have an id assigned to it (via {@link #setId(int)}) * for its state to be saved. This flag can only disable the * saving of this view; any child views may still have their state saved. * * @param enabled Set to false to disable state saving, or true * (the default) to allow it. * * @see #isSaveEnabled() * @see #setId(int) * @see #onSaveInstanceState() * @attr ref android.R.styleable#View_saveEnabled */ public void setSaveEnabled(boolean enabled) { setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); } /** * Gets whether the framework should discard touches when the view's * window is obscured by another visible window. * Refer to the {@link View} security documentation for more details. * * @return True if touch filtering is enabled. * * @see #setFilterTouchesWhenObscured(boolean) * @attr ref android.R.styleable#View_filterTouchesWhenObscured */ @ViewDebug.ExportedProperty public boolean getFilterTouchesWhenObscured() { return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; } /** * Sets whether the framework should discard touches when the view's * window is obscured by another visible window. * Refer to the {@link View} security documentation for more details. * * @param enabled True if touch filtering should be enabled. * * @see #getFilterTouchesWhenObscured * @attr ref android.R.styleable#View_filterTouchesWhenObscured */ public void setFilterTouchesWhenObscured(boolean enabled) { setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, FILTER_TOUCHES_WHEN_OBSCURED); } /** * Indicates whether the entire hierarchy under this view will save its * state when a state saving traversal occurs from its parent. The default * is true; if false, these views will not be saved unless * {@link #saveHierarchyState(SparseArray)} is called directly on this view. * * @return Returns true if the view state saving from parent is enabled, else false. * * @see #setSaveFromParentEnabled(boolean) */ public boolean isSaveFromParentEnabled() { return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; } /** * Controls whether the entire hierarchy under this view will save its * state when a state saving traversal occurs from its parent. The default * is true; if false, these views will not be saved unless * {@link #saveHierarchyState(SparseArray)} is called directly on this view. * * @param enabled Set to false to disable state saving, or true * (the default) to allow it. * * @see #isSaveFromParentEnabled() * @see #setId(int) * @see #onSaveInstanceState() */ public void setSaveFromParentEnabled(boolean enabled) { setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); } /** * Returns whether this View is able to take focus. * * @return True if this view can take focus, or false otherwise. * @attr ref android.R.styleable#View_focusable */ @ViewDebug.ExportedProperty(category = "focus") public final boolean isFocusable() { return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); } /** * When a view is focusable, it may not want to take focus when in touch mode. * For example, a button would like focus when the user is navigating via a D-pad * so that the user can click on it, but once the user starts touching the screen, * the button shouldn't take focus * @return Whether the view is focusable in touch mode. * @attr ref android.R.styleable#View_focusableInTouchMode */ @ViewDebug.ExportedProperty public final boolean isFocusableInTouchMode() { return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); } /** * Find the nearest view in the specified direction that can take focus. * This does not actually give focus to that view. * * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT * * @return The nearest focusable in the specified direction, or null if none * can be found. */ public View focusSearch(int direction) { if (mParent != null) { return mParent.focusSearch(this, direction); } else { return null; } } /** * This method is the last chance for the focused view and its ancestors to * respond to an arrow key. This is called when the focused view did not * consume the key internally, nor could the view system find a new view in * the requested direction to give focus to. * * @param focused The currently focused view. * @param direction The direction focus wants to move. One of FOCUS_UP, * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. * @return True if the this view consumed this unhandled move. */ public boolean dispatchUnhandledMove(View focused, int direction) { return false; } /** * If a user manually specified the next view id for a particular direction, * use the root to look up the view. * @param root The root view of the hierarchy containing this view. * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, * or FOCUS_BACKWARD. * @return The user specified next view, or null if there is none. */ View findUserSetNextFocus(View root, int direction) { switch (direction) { case FOCUS_LEFT: if (mNextFocusLeftId == View.NO_ID) return null; return findViewInsideOutShouldExist(root, mNextFocusLeftId); case FOCUS_RIGHT: if (mNextFocusRightId == View.NO_ID) return null; return findViewInsideOutShouldExist(root, mNextFocusRightId); case FOCUS_UP: if (mNextFocusUpId == View.NO_ID) return null; return findViewInsideOutShouldExist(root, mNextFocusUpId); case FOCUS_DOWN: if (mNextFocusDownId == View.NO_ID) return null; return findViewInsideOutShouldExist(root, mNextFocusDownId); case FOCUS_FORWARD: if (mNextFocusForwardId == View.NO_ID) return null; return findViewInsideOutShouldExist(root, mNextFocusForwardId); case FOCUS_BACKWARD: { if (mID == View.NO_ID) return null; final int id = mID; return root.findViewByPredicateInsideOut(this, new Predicate() { @Override public boolean apply(View t) { return t.mNextFocusForwardId == id; } }); } } return null; } private View findViewInsideOutShouldExist(View root, int id) { if (mMatchIdPredicate == null) { mMatchIdPredicate = new MatchIdPredicate(); } mMatchIdPredicate.mId = id; View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); if (result == null) { Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); } return result; } /** * Find and return all focusable views that are descendants of this view, * possibly including this view if it is focusable itself. * * @param direction The direction of the focus * @return A list of focusable views */ public ArrayList getFocusables(int direction) { ArrayList result = new ArrayList(24); addFocusables(result, direction); return result; } /** * Add any focusable views that are descendants of this view (possibly * including this view if it is focusable itself) to views. If we are in touch mode, * only add views that are also focusable in touch mode. * * @param views Focusable views found so far * @param direction The direction of the focus */ public void addFocusables(ArrayList views, int direction) { addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); } /** * Adds any focusable views that are descendants of this view (possibly * including this view if it is focusable itself) to views. This method * adds all focusable views regardless if we are in touch mode or * only views focusable in touch mode if we are in touch mode or * only views that can take accessibility focus if accessibility is enabeld * depending on the focusable mode paramater. * * @param views Focusable views found so far or null if all we are interested is * the number of focusables. * @param direction The direction of the focus. * @param focusableMode The type of focusables to be added. * * @see #FOCUSABLES_ALL * @see #FOCUSABLES_TOUCH_MODE */ public void addFocusables(ArrayList views, int direction, int focusableMode) { if (views == null) { return; } if (!isFocusable()) { return; } if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && isInTouchMode() && !isFocusableInTouchMode()) { return; } views.add(this); } /** * Finds the Views that contain given text. The containment is case insensitive. * The search is performed by either the text that the View renders or the content * description that describes the view for accessibility purposes and the view does * not render or both. Clients can specify how the search is to be performed via * passing the {@link #FIND_VIEWS_WITH_TEXT} and * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. * * @param outViews The output list of matching Views. * @param searched The text to match against. * * @see #FIND_VIEWS_WITH_TEXT * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION * @see #setContentDescription(CharSequence) */ public void findViewsWithText(ArrayList outViews, CharSequence searched, int flags) { if (getAccessibilityNodeProvider() != null) { if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { outViews.add(this); } } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 && (searched != null && searched.length() > 0) && (mContentDescription != null && mContentDescription.length() > 0)) { String searchedLowerCase = searched.toString().toLowerCase(); String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); if (contentDescriptionLowerCase.contains(searchedLowerCase)) { outViews.add(this); } } } /** * Find and return all touchable views that are descendants of this view, * possibly including this view if it is touchable itself. * * @return A list of touchable views */ public ArrayList getTouchables() { ArrayList result = new ArrayList(); addTouchables(result); return result; } /** * Add any touchable views that are descendants of this view (possibly * including this view if it is touchable itself) to views. * * @param views Touchable views found so far */ public void addTouchables(ArrayList views) { final int viewFlags = mViewFlags; if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && (viewFlags & ENABLED_MASK) == ENABLED) { views.add(this); } } /** * Returns whether this View is accessibility focused. * * @return True if this View is accessibility focused. * @hide */ public boolean isAccessibilityFocused() { return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; } /** * Call this to try to give accessibility focus to this view. * * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} * returns false or the view is no visible or the view already has accessibility * focus. * * See also {@link #focusSearch(int)}, which is what you call to say that you * have focus, and you want your parent to look for the next one. * * @return Whether this view actually took accessibility focus. * * @hide */ public boolean requestAccessibilityFocus() { AccessibilityManager manager = AccessibilityManager.getInstance(mContext); if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { return false; } if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { return false; } if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; ViewRootImpl viewRootImpl = getViewRootImpl(); if (viewRootImpl != null) { viewRootImpl.setAccessibilityFocus(this, null); } invalidate(); sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); return true; } return false; } /** * Call this to try to clear accessibility focus of this view. * * See also {@link #focusSearch(int)}, which is what you call to say that you * have focus, and you want your parent to look for the next one. * * @hide */ public void clearAccessibilityFocus() { clearAccessibilityFocusNoCallbacks(); // Clear the global reference of accessibility focus if this // view or any of its descendants had accessibility focus. ViewRootImpl viewRootImpl = getViewRootImpl(); if (viewRootImpl != null) { View focusHost = viewRootImpl.getAccessibilityFocusedHost(); if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { viewRootImpl.setAccessibilityFocus(null, null); } } } private void sendAccessibilityHoverEvent(int eventType) { // Since we are not delivering to a client accessibility events from not // important views (unless the clinet request that) we need to fire the // event from the deepest view exposed to the client. As a consequence if // the user crosses a not exposed view the client will see enter and exit // of the exposed predecessor followed by and enter and exit of that same // predecessor when entering and exiting the not exposed descendant. This // is fine since the client has a clear idea which view is hovered at the // price of a couple more events being sent. This is a simple and // working solution. View source = this; while (true) { if (source.includeForAccessibility()) { source.sendAccessibilityEvent(eventType); return; } ViewParent parent = source.getParent(); if (parent instanceof View) { source = (View) parent; } else { return; } } } /** * Clears accessibility focus without calling any callback methods * normally invoked in {@link #clearAccessibilityFocus()}. This method * is used for clearing accessibility focus when giving this focus to * another view. */ void clearAccessibilityFocusNoCallbacks() { if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; invalidate(); sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); } } /** * Call this to try to give focus to a specific view or to one of its * descendants. * * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns * false), or if it is focusable and it is not focusable in touch mode * ({@link #isFocusableInTouchMode}) while the device is in touch mode. * * See also {@link #focusSearch(int)}, which is what you call to say that you * have focus, and you want your parent to look for the next one. * * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments * {@link #FOCUS_DOWN} and null. * * @return Whether this view or one of its descendants actually took focus. */ public final boolean requestFocus() { return requestFocus(View.FOCUS_DOWN); } /** * Call this to try to give focus to a specific view or to one of its * descendants and give it a hint about what direction focus is heading. * * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns * false), or if it is focusable and it is not focusable in touch mode * ({@link #isFocusableInTouchMode}) while the device is in touch mode. * * See also {@link #focusSearch(int)}, which is what you call to say that you * have focus, and you want your parent to look for the next one. * * This is equivalent to calling {@link #requestFocus(int, Rect)} with * null set for the previously focused rectangle. * * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT * @return Whether this view or one of its descendants actually took focus. */ public final boolean requestFocus(int direction) { return requestFocus(direction, null); } /** * Call this to try to give focus to a specific view or to one of its descendants * and give it hints about the direction and a specific rectangle that the focus * is coming from. The rectangle can help give larger views a finer grained hint * about where focus is coming from, and therefore, where to show selection, or * forward focus change internally. * * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns * false), or if it is focusable and it is not focusable in touch mode * ({@link #isFocusableInTouchMode}) while the device is in touch mode. * * A View will not take focus if it is not visible. * * A View will not take focus if one of its parents has * {@link android.view.ViewGroup#getDescendantFocusability()} equal to * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. * * See also {@link #focusSearch(int)}, which is what you call to say that you * have focus, and you want your parent to look for the next one. * * You may wish to override this method if your custom {@link View} has an internal * {@link View} that it wishes to forward the request to. * * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT * @param previouslyFocusedRect The rectangle (in this View's coordinate system) * to give a finer grained hint about where focus is coming from. May be null * if there is no hint. * @return Whether this view or one of its descendants actually took focus. */ public boolean requestFocus(int direction, Rect previouslyFocusedRect) { return requestFocusNoSearch(direction, previouslyFocusedRect); } private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { // need to be focusable if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || (mViewFlags & VISIBILITY_MASK) != VISIBLE) { return false; } // need to be focusable in touch mode if in touch mode if (isInTouchMode() && (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { return false; } // need to not have any parents blocking us if (hasAncestorThatBlocksDescendantFocus()) { return false; } handleFocusGainInternal(direction, previouslyFocusedRect); return true; } /** * Call this to try to give focus to a specific view or to one of its descendants. This is a * special variant of {@link #requestFocus() } that will allow views that are not focuable in * touch mode to request focus when they are touched. * * @return Whether this view or one of its descendants actually took focus. * * @see #isInTouchMode() * */ public final boolean requestFocusFromTouch() { // Leave touch mode if we need to if (isInTouchMode()) { ViewRootImpl viewRoot = getViewRootImpl(); if (viewRoot != null) { viewRoot.ensureTouchMode(false); } } return requestFocus(View.FOCUS_DOWN); } /** * @return Whether any ancestor of this view blocks descendant focus. */ private boolean hasAncestorThatBlocksDescendantFocus() { ViewParent ancestor = mParent; while (ancestor instanceof ViewGroup) { final ViewGroup vgAncestor = (ViewGroup) ancestor; if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { return true; } else { ancestor = vgAncestor.getParent(); } } return false; } /** * Gets the mode for determining whether this View is important for accessibility * which is if it fires accessibility events and if it is reported to * accessibility services that query the screen. * * @return The mode for determining whether a View is important for accessibility. * * @attr ref android.R.styleable#View_importantForAccessibility * * @see #IMPORTANT_FOR_ACCESSIBILITY_YES * @see #IMPORTANT_FOR_ACCESSIBILITY_NO * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO */ @ViewDebug.ExportedProperty(category = "accessibility", mapping = { @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no"), @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS, to = "noHideDescendants") }) public int getImportantForAccessibility() { return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; } /** * Sets the live region mode for this view. This indicates to accessibility * services whether they should automatically notify the user about changes * to the view's content description or text, or to the content descriptions * or text of the view's children (where applicable). *

* For example, in a login screen with a TextView that displays an "incorrect * password" notification, that view should be marked as a live region with * mode {@link #ACCESSIBILITY_LIVE_REGION_POLITE}. *

* To disable change notifications for this view, use * {@link #ACCESSIBILITY_LIVE_REGION_NONE}. This is the default live region * mode for most views. *

* To indicate that the user should be notified of changes, use * {@link #ACCESSIBILITY_LIVE_REGION_POLITE}. *

* If the view's changes should interrupt ongoing speech and notify the user * immediately, use {@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}. * * @param mode The live region mode for this view, one of: *

    *
  • {@link #ACCESSIBILITY_LIVE_REGION_NONE} *
  • {@link #ACCESSIBILITY_LIVE_REGION_POLITE} *
  • {@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE} *
* @attr ref android.R.styleable#View_accessibilityLiveRegion */ public void setAccessibilityLiveRegion(int mode) { if (mode != getAccessibilityLiveRegion()) { mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK; mPrivateFlags2 |= (mode << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT) & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK; notifyViewAccessibilityStateChangedIfNeeded( AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); } } /** * Gets the live region mode for this View. * * @return The live region mode for the view. * * @attr ref android.R.styleable#View_accessibilityLiveRegion * * @see #setAccessibilityLiveRegion(int) */ public int getAccessibilityLiveRegion() { return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK) >> PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT; } /** * Sets how to determine whether this view is important for accessibility * which is if it fires accessibility events and if it is reported to * accessibility services that query the screen. * * @param mode How to determine whether this view is important for accessibility. * * @attr ref android.R.styleable#View_importantForAccessibility * * @see #IMPORTANT_FOR_ACCESSIBILITY_YES * @see #IMPORTANT_FOR_ACCESSIBILITY_NO * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO */ public void setImportantForAccessibility(int mode) { final int oldMode = getImportantForAccessibility(); if (mode != oldMode) { // If we're moving between AUTO and another state, we might not need // to send a subtree changed notification. We'll store the computed // importance, since we'll need to check it later to make sure. final boolean maySkipNotify = oldMode == IMPORTANT_FOR_ACCESSIBILITY_AUTO || mode == IMPORTANT_FOR_ACCESSIBILITY_AUTO; final boolean oldIncludeForAccessibility = maySkipNotify && includeForAccessibility(); mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; if (!maySkipNotify || oldIncludeForAccessibility != includeForAccessibility()) { notifySubtreeAccessibilityStateChangedIfNeeded(); } else { notifyViewAccessibilityStateChangedIfNeeded( AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); } } } /** * Gets whether this view should be exposed for accessibility. * * @return Whether the view is exposed for accessibility. * * @hide */ public boolean isImportantForAccessibility() { final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; if (mode == IMPORTANT_FOR_ACCESSIBILITY_NO || mode == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) { return false; } // Check parent mode to ensure we're not hidden. ViewParent parent = mParent; while (parent instanceof View) { if (((View) parent).getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) { return false; } parent = parent.getParent(); } return mode == IMPORTANT_FOR_ACCESSIBILITY_YES || isActionableForAccessibility() || hasListenersForAccessibility() || getAccessibilityNodeProvider() != null || getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE; } /** * Gets the parent for accessibility purposes. Note that the parent for * accessibility is not necessary the immediate parent. It is the first * predecessor that is important for accessibility. * * @return The parent for accessibility purposes. */ public ViewParent getParentForAccessibility() { if (mParent instanceof View) { View parentView = (View) mParent; if (parentView.includeForAccessibility()) { return mParent; } else { return mParent.getParentForAccessibility(); } } return null; } /** * Adds the children of a given View for accessibility. Since some Views are * not important for accessibility the children for accessibility are not * necessarily direct children of the view, rather they are the first level of * descendants important for accessibility. * * @param children The list of children for accessibility. */ public void addChildrenForAccessibility(ArrayList children) { if (includeForAccessibility()) { children.add(this); } } /** * Whether to regard this view for accessibility. A view is regarded for * accessibility if it is important for accessibility or the querying * accessibility service has explicitly requested that view not * important for accessibility are regarded. * * @return Whether to regard the view for accessibility. * * @hide */ public boolean includeForAccessibility() { //noinspection SimplifiableIfStatement if (mAttachInfo != null) { return (mAttachInfo.mAccessibilityFetchFlags & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 || isImportantForAccessibility(); } return false; } /** * Returns whether the View is considered actionable from * accessibility perspective. Such view are important for * accessibility. * * @return True if the view is actionable for accessibility. * * @hide */ public boolean isActionableForAccessibility() { return (isClickable() || isLongClickable() || isFocusable()); } /** * Returns whether the View has registered callbacks wich makes it * important for accessibility. * * @return True if the view is actionable for accessibility. */ private boolean hasListenersForAccessibility() { ListenerInfo info = getListenerInfo(); return mTouchDelegate != null || info.mOnKeyListener != null || info.mOnTouchListener != null || info.mOnGenericMotionListener != null || info.mOnHoverListener != null || info.mOnDragListener != null; } /** * Notifies that the accessibility state of this view changed. The change * is local to this view and does not represent structural changes such * as children and parent. For example, the view became focusable. The * notification is at at most once every * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} * to avoid unnecessary load to the system. Also once a view has a pending * notifucation this method is a NOP until the notification has been sent. * * @hide */ public void notifyViewAccessibilityStateChangedIfNeeded(int changeType) { if (!AccessibilityManager.getInstance(mContext).isEnabled()) { return; } if (mSendViewStateChangedAccessibilityEvent == null) { mSendViewStateChangedAccessibilityEvent = new SendViewStateChangedAccessibilityEvent(); } mSendViewStateChangedAccessibilityEvent.runOrPost(changeType); } /** * Notifies that the accessibility state of this view changed. The change * is *not* local to this view and does represent structural changes such * as children and parent. For example, the view size changed. The * notification is at at most once every * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} * to avoid unnecessary load to the system. Also once a view has a pending * notifucation this method is a NOP until the notification has been sent. * * @hide */ public void notifySubtreeAccessibilityStateChangedIfNeeded() { if (!AccessibilityManager.getInstance(mContext).isEnabled()) { return; } if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) { mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; if (mParent != null) { try { mParent.notifySubtreeAccessibilityStateChanged( this, this, AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE); } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); } } } } /** * Reset the flag indicating the accessibility state of the subtree rooted * at this view changed. */ void resetSubtreeAccessibilityStateChanged() { mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; } /** * Performs the specified accessibility action on the view. For * possible accessibility actions look at {@link AccessibilityNodeInfo}. *

* If an {@link AccessibilityDelegate} has been specified via calling * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} * is responsible for handling this call. *

* * @param action The action to perform. * @param arguments Optional action arguments. * @return Whether the action was performed. */ public boolean performAccessibilityAction(int action, Bundle arguments) { if (mAccessibilityDelegate != null) { return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); } else { return performAccessibilityActionInternal(action, arguments); } } /** * @see #performAccessibilityAction(int, Bundle) * * Note: Called from the default {@link AccessibilityDelegate}. */ boolean performAccessibilityActionInternal(int action, Bundle arguments) { switch (action) { case AccessibilityNodeInfo.ACTION_CLICK: { if (isClickable()) { performClick(); return true; } } break; case AccessibilityNodeInfo.ACTION_LONG_CLICK: { if (isLongClickable()) { performLongClick(); return true; } } break; case AccessibilityNodeInfo.ACTION_FOCUS: { if (!hasFocus()) { // Get out of touch mode since accessibility // wants to move focus around. getViewRootImpl().ensureTouchMode(false); return requestFocus(); } } break; case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { if (hasFocus()) { clearFocus(); return !isFocused(); } } break; case AccessibilityNodeInfo.ACTION_SELECT: { if (!isSelected()) { setSelected(true); return isSelected(); } } break; case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { if (isSelected()) { setSelected(false); return !isSelected(); } } break; case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { if (!isAccessibilityFocused()) { return requestAccessibilityFocus(); } } break; case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { if (isAccessibilityFocused()) { clearAccessibilityFocus(); return true; } } break; case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { if (arguments != null) { final int granularity = arguments.getInt( AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); final boolean extendSelection = arguments.getBoolean( AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); return traverseAtGranularity(granularity, true, extendSelection); } } break; case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { if (arguments != null) { final int granularity = arguments.getInt( AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); final boolean extendSelection = arguments.getBoolean( AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); return traverseAtGranularity(granularity, false, extendSelection); } } break; case AccessibilityNodeInfo.ACTION_SET_SELECTION: { CharSequence text = getIterableTextForAccessibility(); if (text == null) { return false; } final int start = (arguments != null) ? arguments.getInt( AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; final int end = (arguments != null) ? arguments.getInt( AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; // Only cursor position can be specified (selection length == 0) if ((getAccessibilitySelectionStart() != start || getAccessibilitySelectionEnd() != end) && (start == end)) { setAccessibilitySelection(start, end); notifyViewAccessibilityStateChangedIfNeeded( AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); return true; } } break; } return false; } private boolean traverseAtGranularity(int granularity, boolean forward, boolean extendSelection) { CharSequence text = getIterableTextForAccessibility(); if (text == null || text.length() == 0) { return false; } TextSegmentIterator iterator = getIteratorForGranularity(granularity); if (iterator == null) { return false; } int current = getAccessibilitySelectionEnd(); if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { current = forward ? 0 : text.length(); } final int[] range = forward ? iterator.following(current) : iterator.preceding(current); if (range == null) { return false; } final int segmentStart = range[0]; final int segmentEnd = range[1]; int selectionStart; int selectionEnd; if (extendSelection && isAccessibilitySelectionExtendable()) { selectionStart = getAccessibilitySelectionStart(); if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { selectionStart = forward ? segmentStart : segmentEnd; } selectionEnd = forward ? segmentEnd : segmentStart; } else { selectionStart = selectionEnd= forward ? segmentEnd : segmentStart; } setAccessibilitySelection(selectionStart, selectionEnd); final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY; sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd); return true; } /** * Gets the text reported for accessibility purposes. * * @return The accessibility text. * * @hide */ public CharSequence getIterableTextForAccessibility() { return getContentDescription(); } /** * Gets whether accessibility selection can be extended. * * @return If selection is extensible. * * @hide */ public boolean isAccessibilitySelectionExtendable() { return false; } /** * @hide */ public int getAccessibilitySelectionStart() { return mAccessibilityCursorPosition; } /** * @hide */ public int getAccessibilitySelectionEnd() { return getAccessibilitySelectionStart(); } /** * @hide */ public void setAccessibilitySelection(int start, int end) { if (start == end && end == mAccessibilityCursorPosition) { return; } if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { mAccessibilityCursorPosition = start; } else { mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; } sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); } private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, int fromIndex, int toIndex) { if (mParent == null) { return; } AccessibilityEvent event = AccessibilityEvent.obtain( AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); onInitializeAccessibilityEvent(event); onPopulateAccessibilityEvent(event); event.setFromIndex(fromIndex); event.setToIndex(toIndex); event.setAction(action); event.setMovementGranularity(granularity); mParent.requestSendAccessibilityEvent(this, event); } /** * @hide */ public TextSegmentIterator getIteratorForGranularity(int granularity) { switch (granularity) { case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { CharSequence text = getIterableTextForAccessibility(); if (text != null && text.length() > 0) { CharacterTextSegmentIterator iterator = CharacterTextSegmentIterator.getInstance( mContext.getResources().getConfiguration().locale); iterator.initialize(text.toString()); return iterator; } } break; case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { CharSequence text = getIterableTextForAccessibility(); if (text != null && text.length() > 0) { WordTextSegmentIterator iterator = WordTextSegmentIterator.getInstance( mContext.getResources().getConfiguration().locale); iterator.initialize(text.toString()); return iterator; } } break; case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { CharSequence text = getIterableTextForAccessibility(); if (text != null && text.length() > 0) { ParagraphTextSegmentIterator iterator = ParagraphTextSegmentIterator.getInstance(); iterator.initialize(text.toString()); return iterator; } } break; } return null; } /** * @hide */ public void dispatchStartTemporaryDetach() { clearDisplayList(); onStartTemporaryDetach(); } /** * This is called when a container is going to temporarily detach a child, with * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. * It will either be followed by {@link #onFinishTemporaryDetach()} or * {@link #onDetachedFromWindow()} when the container is done. */ public void onStartTemporaryDetach() { removeUnsetPressCallback(); mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; } /** * @hide */ public void dispatchFinishTemporaryDetach() { onFinishTemporaryDetach(); } /** * Called after {@link #onStartTemporaryDetach} when the container is done * changing the view. */ public void onFinishTemporaryDetach() { } /** * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} * for this view's window. Returns null if the view is not currently attached * to the window. Normally you will not need to use this directly, but * just use the standard high-level event callbacks like * {@link #onKeyDown(int, KeyEvent)}. */ public KeyEvent.DispatcherState getKeyDispatcherState() { return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; } /** * Dispatch a key event before it is processed by any input method * associated with the view hierarchy. This can be used to intercept * key events in special situations before the IME consumes them; a * typical example would be handling the BACK key to update the application's * UI instead of allowing the IME to see it and close itself. * * @param event The key event to be dispatched. * @return True if the event was handled, false otherwise. */ public boolean dispatchKeyEventPreIme(KeyEvent event) { return onKeyPreIme(event.getKeyCode(), event); } /** * Dispatch a key event to the next view on the focus path. This path runs * from the top of the view tree down to the currently focused view. If this * view has focus, it will dispatch to itself. Otherwise it will dispatch * the next node down the focus path. This method also fires any key * listeners. * * @param event The key event to be dispatched. * @return True if the event was handled, false otherwise. */ public boolean dispatchKeyEvent(KeyEvent event) { if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onKeyEvent(event, 0); } // Give any attached key listener a first crack at the event. //noinspection SimplifiableIfStatement ListenerInfo li = mListenerInfo; if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { return true; } if (event.dispatch(this, mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null, this)) { return true; } if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); } return false; } /** * Dispatches a key shortcut event. * * @param event The key event to be dispatched. * @return True if the event was handled by the view, false otherwise. */ public boolean dispatchKeyShortcutEvent(KeyEvent event) { return onKeyShortcut(event.getKeyCode(), event); } /** * Pass the touch screen motion event down to the target view, or this * view if it is the target. * * @param event The motion event to be dispatched. * @return True if the event was handled by the view, false otherwise. */ public boolean dispatchTouchEvent(MotionEvent event) { if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onTouchEvent(event, 0); } if (onFilterTouchEventForSecurity(event)) { //noinspection SimplifiableIfStatement ListenerInfo li = mListenerInfo; if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && li.mOnTouchListener.onTouch(this, event)) { return true; } if (onTouchEvent(event)) { return true; } } if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); } return false; } /** * Filter the touch event to apply security policies. * * @param event The motion event to be filtered. * @return True if the event should be dispatched, false if the event should be dropped. * * @see #getFilterTouchesWhenObscured */ public boolean onFilterTouchEventForSecurity(MotionEvent event) { //noinspection RedundantIfStatement if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { // Window is obscured, drop this touch. return false; } return true; } /** * Pass a trackball motion event down to the focused view. * * @param event The motion event to be dispatched. * @return True if the event was handled by the view, false otherwise. */ public boolean dispatchTrackballEvent(MotionEvent event) { if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onTrackballEvent(event, 0); } return onTrackballEvent(event); } /** * Dispatch a generic motion event. *

* Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} * are delivered to the view under the pointer. All other generic motion events are * delivered to the focused view. Hover events are handled specially and are delivered * to {@link #onHoverEvent(MotionEvent)}. *

* * @param event The motion event to be dispatched. * @return True if the event was handled by the view, false otherwise. */ public boolean dispatchGenericMotionEvent(MotionEvent event) { if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); } final int source = event.getSource(); if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { final int action = event.getAction(); if (action == MotionEvent.ACTION_HOVER_ENTER || action == MotionEvent.ACTION_HOVER_MOVE || action == MotionEvent.ACTION_HOVER_EXIT) { if (dispatchHoverEvent(event)) { return true; } } else if (dispatchGenericPointerEvent(event)) { return true; } } else if (dispatchGenericFocusedEvent(event)) { return true; } if (dispatchGenericMotionEventInternal(event)) { return true; } if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); } return false; } private boolean dispatchGenericMotionEventInternal(MotionEvent event) { //noinspection SimplifiableIfStatement ListenerInfo li = mListenerInfo; if (li != null && li.mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && li.mOnGenericMotionListener.onGenericMotion(this, event)) { return true; } if (onGenericMotionEvent(event)) { return true; } if (mInputEventConsistencyVerifier != null) { mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); } return false; } /** * Dispatch a hover event. *

* Do not call this method directly. * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. *

* * @param event The motion event to be dispatched. * @return True if the event was handled by the view, false otherwise. */ protected boolean dispatchHoverEvent(MotionEvent event) { ListenerInfo li = mListenerInfo; //noinspection SimplifiableIfStatement if (li != null && li.mOnHoverListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && li.mOnHoverListener.onHover(this, event)) { return true; } return onHoverEvent(event); } /** * Returns true if the view has a child to which it has recently sent * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and * it does not have a hovered child, then it must be the innermost hovered view. * @hide */ protected boolean hasHoveredChild() { return false; } /** * Dispatch a generic motion event to the view under the first pointer. *

* Do not call this method directly. * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. *

* * @param event The motion event to be dispatched. * @return True if the event was handled by the view, false otherwise. */ protected boolean dispatchGenericPointerEvent(MotionEvent event) { return false; } /** * Dispatch a generic motion event to the currently focused view. *

* Do not call this method directly. * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. *

* * @param event The motion event to be dispatched. * @return True if the event was handled by the view, false otherwise. */ protected boolean dispatchGenericFocusedEvent(MotionEvent event) { return false; } /** * Dispatch a pointer event. *

* Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches * and should not be expected to handle other pointing device features. *

* * @param event The motion event to be dispatched. * @return True if the event was handled by the view, false otherwise. * @hide */ public final boolean dispatchPointerEvent(MotionEvent event) { if (event.isTouchEvent()) { return dispatchTouchEvent(event); } else { return dispatchGenericMotionEvent(event); } } /** * Called when the window containing this view gains or loses window focus. * ViewGroups should override to route to their children. * * @param hasFocus True if the window containing this view now has focus, * false otherwise. */ public void dispatchWindowFocusChanged(boolean hasFocus) { onWindowFocusChanged(hasFocus); } /** * Called when the window containing this view gains or loses focus. Note * that this is separate from view focus: to receive key events, both * your view and its window must have focus. If a window is displayed * on top of yours that takes input focus, then your own window will lose * focus but the view focus will remain unchanged. * * @param hasWindowFocus True if the window containing this view now has * focus, false otherwise. */ public void onWindowFocusChanged(boolean hasWindowFocus) { InputMethodManager imm = InputMethodManager.peekInstance(); if (!hasWindowFocus) { if (isPressed()) { setPressed(false); } if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { imm.focusOut(this); } removeLongPressCallback(); removeTapCallback(); onFocusLost(); } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { imm.focusIn(this); } refreshDrawableState(); } /** * Returns true if this view is in a window that currently has window focus. * Note that this is not the same as the view itself having focus. * * @return True if this view is in a window that currently has window focus. */ public boolean hasWindowFocus() { return mAttachInfo != null && mAttachInfo.mHasWindowFocus; } /** * Dispatch a view visibility change down the view hierarchy. * ViewGroups should override to route to their children. * @param changedView The view whose visibility changed. Could be 'this' or * an ancestor view. * @param visibility The new visibility of changedView: {@link #VISIBLE}, * {@link #INVISIBLE} or {@link #GONE}. */ protected void dispatchVisibilityChanged(View changedView, int visibility) { onVisibilityChanged(changedView, visibility); } /** * Called when the visibility of the view or an ancestor of the view is changed. * @param changedView The view whose visibility changed. Could be 'this' or * an ancestor view. * @param visibility The new visibility of changedView: {@link #VISIBLE}, * {@link #INVISIBLE} or {@link #GONE}. */ protected void onVisibilityChanged(View changedView, int visibility) { if (visibility == VISIBLE) { if (mAttachInfo != null) { initialAwakenScrollBars(); } else { mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; } } } /** * Dispatch a hint about whether this view is displayed. For instance, when * a View moves out of the screen, it might receives a display hint indicating * the view is not displayed. Applications should not rely on this hint * as there is no guarantee that they will receive one. * * @param hint A hint about whether or not this view is displayed: * {@link #VISIBLE} or {@link #INVISIBLE}. */ public void dispatchDisplayHint(int hint) { onDisplayHint(hint); } /** * Gives this view a hint about whether is displayed or not. For instance, when * a View moves out of the screen, it might receives a display hint indicating * the view is not displayed. Applications should not rely on this hint * as there is no guarantee that they will receive one. * * @param hint A hint about whether or not this view is displayed: * {@link #VISIBLE} or {@link #INVISIBLE}. */ protected void onDisplayHint(int hint) { } /** * Dispatch a window visibility change down the view hierarchy. * ViewGroups should override to route to their children. * * @param visibility The new visibility of the window. * * @see #onWindowVisibilityChanged(int) */ public void dispatchWindowVisibilityChanged(int visibility) { onWindowVisibilityChanged(visibility); } /** * Called when the window containing has change its visibility * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note * that this tells you whether or not your window is being made visible * to the window manager; this does not tell you whether or not * your window is obscured by other windows on the screen, even if it * is itself visible. * * @param visibility The new visibility of the window. */ protected void onWindowVisibilityChanged(int visibility) { if (visibility == VISIBLE) { initialAwakenScrollBars(); } } /** * Returns the current visibility of the window this view is attached to * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). * * @return Returns the current visibility of the view's window. */ public int getWindowVisibility() { return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; } /** * Retrieve the overall visible display size in which the window this view is * attached to has been positioned in. This takes into account screen * decorations above the window, for both cases where the window itself * is being position inside of them or the window is being placed under * then and covered insets are used for the window to position its content * inside. In effect, this tells you the available area where content can * be placed and remain visible to users. * *

This function requires an IPC back to the window manager to retrieve * the requested information, so should not be used in performance critical * code like drawing. * * @param outRect Filled in with the visible display frame. If the view * is not attached to a window, this is simply the raw display size. */ public void getWindowVisibleDisplayFrame(Rect outRect) { if (mAttachInfo != null) { try { mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); } catch (RemoteException e) { return; } // XXX This is really broken, and probably all needs to be done // in the window manager, and we need to know more about whether // we want the area behind or in front of the IME. final Rect insets = mAttachInfo.mVisibleInsets; outRect.left += insets.left; outRect.top += insets.top; outRect.right -= insets.right; outRect.bottom -= insets.bottom; return; } // The view is not attached to a display so we don't have a context. // Make a best guess about the display size. Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); d.getRectSize(outRect); } /** * Dispatch a notification about a resource configuration change down * the view hierarchy. * ViewGroups should override to route to their children. * * @param newConfig The new resource configuration. * * @see #onConfigurationChanged(android.content.res.Configuration) */ public void dispatchConfigurationChanged(Configuration newConfig) { onConfigurationChanged(newConfig); } /** * Called when the current configuration of the resources being used * by the application have changed. You can use this to decide when * to reload resources that can changed based on orientation and other * configuration characterstics. You only need to use this if you are * not relying on the normal {@link android.app.Activity} mechanism of * recreating the activity instance upon a configuration change. * * @param newConfig The new resource configuration. */ protected void onConfigurationChanged(Configuration newConfig) { } /** * Private function to aggregate all per-view attributes in to the view * root. */ void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { performCollectViewAttributes(attachInfo, visibility); } void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { if ((visibility & VISIBILITY_MASK) == VISIBLE) { if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { attachInfo.mKeepScreenOn = true; } attachInfo.mSystemUiVisibility |= mSystemUiVisibility; ListenerInfo li = mListenerInfo; if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { attachInfo.mHasSystemUiListeners = true; } } } void needGlobalAttributesUpdate(boolean force) { final AttachInfo ai = mAttachInfo; if (ai != null && !ai.mRecomputeGlobalAttributes) { if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) || ai.mHasSystemUiListeners) { ai.mRecomputeGlobalAttributes = true; } } } /** * Returns whether the device is currently in touch mode. Touch mode is entered * once the user begins interacting with the device by touch, and affects various * things like whether focus is always visible to the user. * * @return Whether the device is in touch mode. */ @ViewDebug.ExportedProperty public boolean isInTouchMode() { if (mAttachInfo != null) { return mAttachInfo.mInTouchMode; } else { return ViewRootImpl.isInTouchMode(); } } /** * Returns the context the view is running in, through which it can * access the current theme, resources, etc. * * @return The view's Context. */ @ViewDebug.CapturedViewProperty public final Context getContext() { return mContext; } /** * Handle a key event before it is processed by any input method * associated with the view hierarchy. This can be used to intercept * key events in special situations before the IME consumes them; a * typical example would be handling the BACK key to update the application's * UI instead of allowing the IME to see it and close itself. * * @param keyCode The value in event.getKeyCode(). * @param event Description of the key event. * @return If you handled the event, return true. If you want to allow the * event to be handled by the next receiver, return false. */ public boolean onKeyPreIme(int keyCode, KeyEvent event) { return false; } /** * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) * KeyEvent.Callback.onKeyDown()}: perform press of the view * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} * is released, if the view is enabled and clickable. * *

Key presses in software keyboards will generally NOT trigger this listener, * although some may elect to do so in some situations. Do not rely on this to * catch software key presses. * * @param keyCode A key code that represents the button pressed, from * {@link android.view.KeyEvent}. * @param event The KeyEvent object that defines the button action. */ public boolean onKeyDown(int keyCode, KeyEvent event) { boolean result = false; if (KeyEvent.isConfirmKey(keyCode)) { if ((mViewFlags & ENABLED_MASK) == DISABLED) { return true; } // Long clickable items don't necessarily have to be clickable if (((mViewFlags & CLICKABLE) == CLICKABLE || (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && (event.getRepeatCount() == 0)) { setPressed(true); checkForLongClick(0); return true; } } return result; } /** * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle * the event). *

Key presses in software keyboards will generally NOT trigger this listener, * although some may elect to do so in some situations. Do not rely on this to * catch software key presses. */ public boolean onKeyLongPress(int keyCode, KeyEvent event) { return false; } /** * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) * KeyEvent.Callback.onKeyUp()}: perform clicking of the view * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or * {@link KeyEvent#KEYCODE_ENTER} is released. *

Key presses in software keyboards will generally NOT trigger this listener, * although some may elect to do so in some situations. Do not rely on this to * catch software key presses. * * @param keyCode A key code that represents the button pressed, from * {@link android.view.KeyEvent}. * @param event The KeyEvent object that defines the button action. */ public boolean onKeyUp(int keyCode, KeyEvent event) { if (KeyEvent.isConfirmKey(keyCode)) { if ((mViewFlags & ENABLED_MASK) == DISABLED) { return true; } if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { setPressed(false); if (!mHasPerformedLongPress) { // This is a tap, so remove the longpress check removeLongPressCallback(); return performClick(); } } } return false; } /** * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle * the event). *

Key presses in software keyboards will generally NOT trigger this listener, * although some may elect to do so in some situations. Do not rely on this to * catch software key presses. * * @param keyCode A key code that represents the button pressed, from * {@link android.view.KeyEvent}. * @param repeatCount The number of times the action was made. * @param event The KeyEvent object that defines the button action. */ public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { return false; } /** * Called on the focused view when a key shortcut event is not handled. * Override this method to implement local key shortcuts for the View. * Key shortcuts can also be implemented by setting the * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. * * @param keyCode The value in event.getKeyCode(). * @param event Description of the key event. * @return If you handled the event, return true. If you want to allow the * event to be handled by the next receiver, return false. */ public boolean onKeyShortcut(int keyCode, KeyEvent event) { return false; } /** * Check whether the called view is a text editor, in which case it * would make sense to automatically display a soft input window for * it. Subclasses should override this if they implement * {@link #onCreateInputConnection(EditorInfo)} to return true if * a call on that method would return a non-null InputConnection, and * they are really a first-class editor that the user would normally * start typing on when the go into a window containing your view. * *

The default implementation always returns false. This does * not mean that its {@link #onCreateInputConnection(EditorInfo)} * will not be called or the user can not otherwise perform edits on your * view; it is just a hint to the system that this is not the primary * purpose of this view. * * @return Returns true if this view is a text editor, else false. */ public boolean onCheckIsTextEditor() { return false; } /** * Create a new InputConnection for an InputMethod to interact * with the view. The default implementation returns null, since it doesn't * support input methods. You can override this to implement such support. * This is only needed for views that take focus and text input. * *

When implementing this, you probably also want to implement * {@link #onCheckIsTextEditor()} to indicate you will return a * non-null InputConnection. * * @param outAttrs Fill in with attribute information about the connection. */ public InputConnection onCreateInputConnection(EditorInfo outAttrs) { return null; } /** * Called by the {@link android.view.inputmethod.InputMethodManager} * when a view who is not the current * input connection target is trying to make a call on the manager. The * default implementation returns false; you can override this to return * true for certain views if you are performing InputConnection proxying * to them. * @param view The View that is making the InputMethodManager call. * @return Return true to allow the call, false to reject. */ public boolean checkInputConnectionProxy(View view) { return false; } /** * Show the context menu for this view. It is not safe to hold on to the * menu after returning from this method. * * You should normally not overload this method. Overload * {@link #onCreateContextMenu(ContextMenu)} or define an * {@link OnCreateContextMenuListener} to add items to the context menu. * * @param menu The context menu to populate */ public void createContextMenu(ContextMenu menu) { ContextMenuInfo menuInfo = getContextMenuInfo(); // Sets the current menu info so all items added to menu will have // my extra info set. ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); onCreateContextMenu(menu); ListenerInfo li = mListenerInfo; if (li != null && li.mOnCreateContextMenuListener != null) { li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); } // Clear the extra information so subsequent items that aren't mine don't // have my extra info. ((MenuBuilder)menu).setCurrentMenuInfo(null); if (mParent != null) { mParent.createContextMenu(menu); } } /** * Views should implement this if they have extra information to associate * with the context menu. The return result is supplied as a parameter to * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} * callback. * * @return Extra information about the item for which the context menu * should be shown. This information will vary across different * subclasses of View. */ protected ContextMenuInfo getContextMenuInfo() { return null; } /** * Views should implement this if the view itself is going to add items to * the context menu. * * @param menu the context menu to populate */ protected void onCreateContextMenu(ContextMenu menu) { } /** * Implement this method to handle trackball motion events. The * relative movement of the trackball since the last event * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so * that a movement of 1 corresponds to the user pressing one DPAD key (so * they will often be fractional values, representing the more fine-grained * movement information available from a trackball). * * @param event The motion event. * @return True if the event was handled, false otherwise. */ public boolean onTrackballEvent(MotionEvent event) { return false; } /** * Implement this method to handle generic motion events. *

* Generic motion events describe joystick movements, mouse hovers, track pad * touches, scroll wheel movements and other input events. The * {@link MotionEvent#getSource() source} of the motion event specifies * the class of input that was received. Implementations of this method * must examine the bits in the source before processing the event. * The following code example shows how this is done. *

* Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} * are delivered to the view under the pointer. All other generic motion events are * delivered to the focused view. *

*
 public boolean onGenericMotionEvent(MotionEvent event) {     *     if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) {     *         if (event.getAction() == MotionEvent.ACTION_MOVE) {     *             // process the joystick movement...     *             return true;     *         }     *     }     *     if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) {     *         switch (event.getAction()) {     *             case MotionEvent.ACTION_HOVER_MOVE:     *                 // process the mouse hover movement...     *                 return true;     *             case MotionEvent.ACTION_SCROLL:     *                 // process the scroll wheel movement...     *                 return true;     *         }     *     }     *     return super.onGenericMotionEvent(event);     * }
* * @param event The generic motion event being processed. * @return True if the event was handled, false otherwise. */ public boolean onGenericMotionEvent(MotionEvent event) { return false; } /** * Implement this method to handle hover events. *

* This method is called whenever a pointer is hovering into, over, or out of the * bounds of a view and the view is not currently being touched. * Hover events are represented as pointer events with action * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, * or {@link MotionEvent#ACTION_HOVER_EXIT}. *

*
    *
  • The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} * when the pointer enters the bounds of the view.
  • *
  • The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} * when the pointer has already entered the bounds of the view and has moved.
  • *
  • The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} * when the pointer has exited the bounds of the view or when the pointer is * about to go down due to a button click, tap, or similar user action that * causes the view to be touched.
  • *
*

* The view should implement this method to return true to indicate that it is * handling the hover event, such as by changing its drawable state. *

* The default implementation calls {@link #setHovered} to update the hovered state * of the view when a hover enter or hover exit event is received, if the view * is enabled and is clickable. The default implementation also sends hover * accessibility events. *

* * @param event The motion event that describes the hover. * @return True if the view handled the hover event. * * @see #isHovered * @see #setHovered * @see #onHoverChanged */ public boolean onHoverEvent(MotionEvent event) { // The root view may receive hover (or touch) events that are outside the bounds of // the window. This code ensures that we only send accessibility events for // hovers that are actually within the bounds of the root view. final int action = event.getActionMasked(); if (!mSendingHoverAccessibilityEvents) { if ((action == MotionEvent.ACTION_HOVER_ENTER || action == MotionEvent.ACTION_HOVER_MOVE) && !hasHoveredChild() && pointInView(event.getX(), event.getY())) { sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); mSendingHoverAccessibilityEvents = true; } } else { if (action == MotionEvent.ACTION_HOVER_EXIT || (action == MotionEvent.ACTION_MOVE && !pointInView(event.getX(), event.getY()))) { mSendingHoverAccessibilityEvents = false; sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); // If the window does not have input focus we take away accessibility // focus as soon as the user stop hovering over the view. if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { getViewRootImpl().setAccessibilityFocus(null, null); } } } if (isHoverable()) { switch (action) { case MotionEvent.ACTION_HOVER_ENTER: setHovered(true); break; case MotionEvent.ACTION_HOVER_EXIT: setHovered(false); break; } // Dispatch the event to onGenericMotionEvent before returning true. // This is to provide compatibility with existing applications that // handled HOVER_MOVE events in onGenericMotionEvent and that would // break because of the new default handling for hoverable views // in onHoverEvent. // Note that onGenericMotionEvent will be called by default when // onHoverEvent returns false (refer to dispatchGenericMotionEvent). dispatchGenericMotionEventInternal(event); // The event was already handled by calling setHovered(), so always // return true. return true; } return false; } /** * Returns true if the view should handle {@link #onHoverEvent} * by calling {@link #setHovered} to change its hovered state. * * @return True if the view is hoverable. */ private boolean isHoverable() { final int viewFlags = mViewFlags; if ((viewFlags & ENABLED_MASK) == DISABLED) { return false; } return (viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; } /** * Returns true if the view is currently hovered. * * @return True if the view is currently hovered. * * @see #setHovered * @see #onHoverChanged */ @ViewDebug.ExportedProperty public boolean isHovered() { return (mPrivateFlags & PFLAG_HOVERED) != 0; } /** * Sets whether the view is currently hovered. *

* Calling this method also changes the drawable state of the view. This * enables the view to react to hover by using different drawable resources * to change its appearance. *

* The {@link #onHoverChanged} method is called when the hovered state changes. *

* * @param hovered True if the view is hovered. * * @see #isHovered * @see #onHoverChanged */ public void setHovered(boolean hovered) { if (hovered) { if ((mPrivateFlags & PFLAG_HOVERED) == 0) { mPrivateFlags |= PFLAG_HOVERED; refreshDrawableState(); onHoverChanged(true); } } else { if ((mPrivateFlags & PFLAG_HOVERED) != 0) { mPrivateFlags &= ~PFLAG_HOVERED; refreshDrawableState(); onHoverChanged(false); } } } /** * Implement this method to handle hover state changes. *

* This method is called whenever the hover state changes as a result of a * call to {@link #setHovered}. *

* * @param hovered The current hover state, as returned by {@link #isHovered}. * * @see #isHovered * @see #setHovered */ public void onHoverChanged(boolean hovered) { } /** * Implement this method to handle touch screen motion events. *

* If this method is used to detect click actions, it is recommended that * the actions be performed by implementing and calling * {@link #performClick()}. This will ensure consistent system behavior, * including: *

    *
  • obeying click sound preferences *
  • dispatching OnClickListener calls *
  • handling {@link AccessibilityNodeInfo#ACTION_CLICK ACTION_CLICK} when * accessibility features are enabled *
* * @param event The motion event. * @return True if the event was handled, false otherwise. */ public boolean onTouchEvent(MotionEvent event) { final int viewFlags = mViewFlags; if ((viewFlags & ENABLED_MASK) == DISABLED) { if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { setPressed(false); } // A disabled view that is clickable still consumes the touch // events, it just doesn't respond to them. return (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); } if (mTouchDelegate != null) { if (mTouchDelegate.onTouchEvent(event)) { return true; } } if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { switch (event.getAction()) { case MotionEvent.ACTION_UP: boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { // take focus if we don't have it already and we should in // touch mode. boolean focusTaken = false; if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { focusTaken = requestFocus(); } if (prepressed) { // The button is being released before we actually // showed it as pressed. Make it show the pressed // state now (before scheduling the click) to ensure // the user sees it. setPressed(true); } if (!mHasPerformedLongPress) { // This is a tap, so remove the longpress check removeLongPressCallback(); // Only perform take click actions if we were in the pressed state if (!focusTaken) { // Use a Runnable and post this rather than calling // performClick directly. This lets other visual state // of the view update before click actions start. if (mPerformClick == null) { mPerformClick = new PerformClick(); } if (!post(mPerformClick)) { performClick(); } } } if (mUnsetPressedState == null) { mUnsetPressedState = new UnsetPressedState(); } if (prepressed) { postDelayed(mUnsetPressedState, ViewConfiguration.getPressedStateDuration()); } else if (!post(mUnsetPressedState)) { // If the post failed, unpress right now mUnsetPressedState.run(); } removeTapCallback(); } break; case MotionEvent.ACTION_DOWN: mHasPerformedLongPress = false; if (performButtonActionOnTouchDown(event)) { break; } // Walk up the hierarchy to determine if we're inside a scrolling container. boolean isInScrollingContainer = isInScrollingContainer(); // For views inside a scrolling container, delay the pressed feedback for // a short period in case this is a scroll. if (isInScrollingContainer) { mPrivateFlags |= PFLAG_PREPRESSED; if (mPendingCheckForTap == null) { mPendingCheckForTap = new CheckForTap(); } postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); } else { // Not inside a scrolling container, so show the feedback right away setPressed(true); checkForLongClick(0); } break; case MotionEvent.ACTION_CANCEL: setPressed(false); removeTapCallback(); removeLongPressCallback(); break; case MotionEvent.ACTION_MOVE: final int x = (int) event.getX(); final int y = (int) event.getY(); // Be lenient about moving outside of buttons if (!pointInView(x, y, mTouchSlop)) { // Outside button removeTapCallback(); if ((mPrivateFlags & PFLAG_PRESSED) != 0) { // Remove any future long press/tap checks removeLongPressCallback(); setPressed(false); } } break; } return true; } return false; } /** * @hide */ public boolean isInScrollingContainer() { ViewParent p = getParent(); while (p != null && p instanceof ViewGroup) { if (((ViewGroup) p).shouldDelayChildPressedState()) { return true; } p = p.getParent(); } return false; } /** * Remove the longpress detection timer. */ private void removeLongPressCallback() { if (mPendingCheckForLongPress != null) { removeCallbacks(mPendingCheckForLongPress); } } /** * Remove the pending click action */ private void removePerformClickCallback() { if (mPerformClick != null) { removeCallbacks(mPerformClick); } } /** * Remove the prepress detection timer. */ private void removeUnsetPressCallback() { if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { setPressed(false); removeCallbacks(mUnsetPressedState); } } /** * Remove the tap detection timer. */ private void removeTapCallback() { if (mPendingCheckForTap != null) { mPrivateFlags &= ~PFLAG_PREPRESSED; removeCallbacks(mPendingCheckForTap); } } /** * Cancels a pending long press. Your subclass can use this if you * want the context menu to come up if the user presses and holds * at the same place, but you don't want it to come up if they press * and then move around enough to cause scrolling. */ public void cancelLongPress() { removeLongPressCallback(); /* * The prepressed state handled by the tap callback is a display * construct, but the tap callback will post a long press callback * less its own timeout. Remove it here. */ removeTapCallback(); } /** * Remove the pending callback for sending a * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. */ private void removeSendViewScrolledAccessibilityEventCallback() { if (mSendViewScrolledAccessibilityEvent != null) { removeCallbacks(mSendViewScrolledAccessibilityEvent); mSendViewScrolledAccessibilityEvent.mIsPending = false; } } /** * Sets the TouchDelegate for this View. */ public void setTouchDelegate(TouchDelegate delegate) { mTouchDelegate = delegate; } /** * Gets the TouchDelegate for this View. */ public TouchDelegate getTouchDelegate() { return mTouchDelegate; } /** * Set flags controlling behavior of this view. * * @param flags Constant indicating the value which should be set * @param mask Constant indicating the bit range that should be changed */ void setFlags(int flags, int mask) { final boolean accessibilityEnabled = AccessibilityManager.getInstance(mContext).isEnabled(); final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility(); int old = mViewFlags; mViewFlags = (mViewFlags & ~mask) | (flags & mask); int changed = mViewFlags ^ old; if (changed == 0) { return; } int privateFlags = mPrivateFlags; /* Check if the FOCUSABLE bit has changed */ if (((changed & FOCUSABLE_MASK) != 0) && ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { if (((old & FOCUSABLE_MASK) == FOCUSABLE) && ((privateFlags & PFLAG_FOCUSED) != 0)) { /* Give up focus if we are no longer focusable */ clearFocus(); } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) && ((privateFlags & PFLAG_FOCUSED) == 0)) { /* * Tell the view system that we are now available to take focus * if no one else already has it. */ if (mParent != null) mParent.focusableViewAvailable(this); } } final int newVisibility = flags & VISIBILITY_MASK; if (newVisibility == VISIBLE) { if ((changed & VISIBILITY_MASK) != 0) { /* * If this view is becoming visible, invalidate it in case it changed while * it was not visible. Marking it drawn ensures that the invalidation will * go through. */ mPrivateFlags |= PFLAG_DRAWN; invalidate(true); needGlobalAttributesUpdate(true); // a view becoming visible is worth notifying the parent // about in case nothing has focus. even if this specific view // isn't focusable, it may contain something that is, so let // the root view try to give this focus if nothing else does. if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { mParent.focusableViewAvailable(this); } } } /* Check if the GONE bit has changed */ if ((changed & GONE) != 0) { needGlobalAttributesUpdate(false); requestLayout(); if (((mViewFlags & VISIBILITY_MASK) == GONE)) { if (hasFocus()) clearFocus(); clearAccessibilityFocus(); destroyDrawingCache(); if (mParent instanceof View) { // GONE views noop invalidation, so invalidate the parent ((View) mParent).invalidate(true); } // Mark the view drawn to ensure that it gets invalidated properly the next // time it is visible and gets invalidated mPrivateFlags |= PFLAG_DRAWN; } if (mAttachInfo != null) { mAttachInfo.mViewVisibilityChanged = true; } } /* Check if the VISIBLE bit has changed */ if ((changed & INVISIBLE) != 0) { needGlobalAttributesUpdate(false); /* * If this view is becoming invisible, set the DRAWN flag so that * the next invalidate() will not be skipped. */ mPrivateFlags |= PFLAG_DRAWN; if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE)) { // root view becoming invisible shouldn't clear focus and accessibility focus if (getRootView() != this) { if (hasFocus()) clearFocus(); clearAccessibilityFocus(); } } if (mAttachInfo != null) { mAttachInfo.mViewVisibilityChanged = true; } } if ((changed & VISIBILITY_MASK) != 0) { // If the view is invisible, cleanup its display list to free up resources if (newVisibility != VISIBLE) { cleanupDraw(); } if (mParent instanceof ViewGroup) { ((ViewGroup) mParent).onChildVisibilityChanged(this, (changed & VISIBILITY_MASK), newVisibility); ((View) mParent).invalidate(true); } else if (mParent != null) { mParent.invalidateChild(this, null); } dispatchVisibilityChanged(this, newVisibility); } if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { destroyDrawingCache(); } if ((changed & DRAWING_CACHE_ENABLED) != 0) { destroyDrawingCache(); mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; invalidateParentCaches(); } if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { destroyDrawingCache(); mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; } if ((changed & DRAW_MASK) != 0) { if ((mViewFlags & WILL_NOT_DRAW) != 0) { if (mBackground != null) { mPrivateFlags &= ~PFLAG_SKIP_DRAW; mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; } else { mPrivateFlags |= PFLAG_SKIP_DRAW; } } else { mPrivateFlags &= ~PFLAG_SKIP_DRAW; } requestLayout(); invalidate(true); } if ((changed & KEEP_SCREEN_ON) != 0) { if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { mParent.recomputeViewAttributes(this); } } if (accessibilityEnabled) { if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0 || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0) { if (oldIncludeForAccessibility != includeForAccessibility()) { notifySubtreeAccessibilityStateChangedIfNeeded(); } else { notifyViewAccessibilityStateChangedIfNeeded( AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); } } else if ((changed & ENABLED_MASK) != 0) { notifyViewAccessibilityStateChangedIfNeeded( AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); } } } /** * Change the view's z order in the tree, so it's on top of other sibling * views. This ordering change may affect layout, if the parent container * uses an order-dependent layout scheme (e.g., LinearLayout). Prior * to {@link android.os.Build.VERSION_CODES#KITKAT} this * method should be followed by calls to {@link #requestLayout()} and * {@link View#invalidate()} on the view's parent to force the parent to redraw * with the new child ordering. * * @see ViewGroup#bringChildToFront(View) */ public void bringToFront() { if (mParent != null) { mParent.bringChildToFront(this); } } /** * This is called in response to an internal scroll in this view (i.e., the * view scrolled its own contents). This is typically as a result of * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been * called. * * @param l Current horizontal scroll origin. * @param t Current vertical scroll origin. * @param oldl Previous horizontal scroll origin. * @param oldt Previous vertical scroll origin. */ protected void onScrollChanged(int l, int t, int oldl, int oldt) { if (AccessibilityManager.getInstance(mContext).isEnabled()) { postSendViewScrolledAccessibilityEventCallback(); } mBackgroundSizeChanged = true; final AttachInfo ai = mAttachInfo; if (ai != null) { ai.mViewScrollChanged = true; } } /** * Interface definition for a callback to be invoked when the layout bounds of a view * changes due to layout processing. */ public interface OnLayoutChangeListener { /** * Called when the focus state of a view has changed. * * @param v The view whose state has changed. * @param left The new value of the view's left property. * @param top The new value of the view's top property. * @param right The new value of the view's right property. * @param bottom The new value of the view's bottom property. * @param oldLeft The previous value of the view's left property. * @param oldTop The previous value of the view's top property. * @param oldRight The previous value of the view's right property. * @param oldBottom The previous value of the view's bottom property. */ void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom); } /** * This is called during layout when the size of this view has changed. If * you were just added to the view hierarchy, you're called with the old * values of 0. * * @param w Current width of this view. * @param h Current height of this view. * @param oldw Old width of this view. * @param oldh Old height of this view. */ protected void onSizeChanged(int w, int h, int oldw, int oldh) { } /** * Called by draw to draw the child views. This may be overridden * by derived classes to gain control just before its children are drawn * (but after its own view has been drawn). * @param canvas the canvas on which to draw the view */ protected void dispatchDraw(Canvas canvas) { } /** * Gets the parent of this view. Note that the parent is a * ViewParent and not necessarily a View. * * @return Parent of this view. */ public final ViewParent getParent() { return mParent; } /** * Set the horizontal scrolled position of your view. This will cause a call to * {@link #onScrollChanged(int, int, int, int)} and the view will be * invalidated. * @param value the x position to scroll to */ public void setScrollX(int value) { scrollTo(value, mScrollY); } /** * Set the vertical scrolled position of your view. This will cause a call to * {@link #onScrollChanged(int, int, int, int)} and the view will be * invalidated. * @param value the y position to scroll to */ public void setScrollY(int value) { scrollTo(mScrollX, value); } /** * Return the scrolled left position of this view. This is the left edge of * the displayed part of your view. You do not need to draw any pixels * farther left, since those are outside of the frame of your view on * screen. * * @return The left edge of the displayed part of your view, in pixels. */ public final int getScrollX() { return mScrollX; } /** * Return the scrolled top position of this view. This is the top edge of * the displayed part of your view. You do not need to draw any pixels above * it, since those are outside of the frame of your view on screen. * * @return The top edge of the displayed part of your view, in pixels. */ public final int getScrollY() { return mScrollY; } /** * Return the width of the your view. * * @return The width of your view, in pixels. */ @ViewDebug.ExportedProperty(category = "layout") public final int getWidth() { return mRight - mLeft; } /** * Return the height of your view. * * @return The height of your view, in pixels. */ @ViewDebug.ExportedProperty(category = "layout") public final int getHeight() { return mBottom - mTop; } /** * Return the visible drawing bounds of your view. Fills in the output * rectangle with the values from getScrollX(), getScrollY(), * getWidth(), and getHeight(). These bounds do not account for any * transformation properties currently set on the view, such as * {@link #setScaleX(float)} or {@link #setRotation(float)}. * * @param outRect The (scrolled) drawing bounds of the view. */ public void getDrawingRect(Rect outRect) { outRect.left = mScrollX; outRect.top = mScrollY; outRect.right = mScrollX + (mRight - mLeft); outRect.bottom = mScrollY + (mBottom - mTop); } /** * Like {@link #getMeasuredWidthAndState()}, but only returns the * raw width component (that is the result is masked by * {@link #MEASURED_SIZE_MASK}). * * @return The raw measured width of this view. */ public final int getMeasuredWidth() { return mMeasuredWidth & MEASURED_SIZE_MASK; } /** * Return the full width measurement information for this view as computed * by the most recent call to {@link #measure(int, int)}. This result is a bit mask * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. * This should be used during measurement and layout calculations only. Use * {@link #getWidth()} to see how wide a view is after layout. * * @return The measured width of this view as a bit mask. */ public final int getMeasuredWidthAndState() { return mMeasuredWidth; } /** * Like {@link #getMeasuredHeightAndState()}, but only returns the * raw width component (that is the result is masked by * {@link #MEASURED_SIZE_MASK}). * * @return The raw measured height of this view. */ public final int getMeasuredHeight() { return mMeasuredHeight & MEASURED_SIZE_MASK; } /** * Return the full height measurement information for this view as computed * by the most recent call to {@link #measure(int, int)}. This result is a bit mask * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. * This should be used during measurement and layout calculations only. Use * {@link #getHeight()} to see how wide a view is after layout. * * @return The measured width of this view as a bit mask. */ public final int getMeasuredHeightAndState() { return mMeasuredHeight; } /** * Return only the state bits of {@link #getMeasuredWidthAndState()} * and {@link #getMeasuredHeightAndState()}, combined into one integer. * The width component is in the regular bits {@link #MEASURED_STATE_MASK} * and the height component is at the shifted bits * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. */ public final int getMeasuredState() { return (mMeasuredWidth&MEASURED_STATE_MASK) | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); } /** * The transform matrix of this view, which is calculated based on the current * roation, scale, and pivot properties. * * @see #getRotation() * @see #getScaleX() * @see #getScaleY() * @see #getPivotX() * @see #getPivotY() * @return The current transform matrix for the view */ public Matrix getMatrix() { if (mTransformationInfo != null) { updateMatrix(); return mTransformationInfo.mMatrix; } return Matrix.IDENTITY_MATRIX; } /** * Utility function to determine if the value is far enough away from zero to be * considered non-zero. * @param value A floating point value to check for zero-ness * @return whether the passed-in value is far enough away from zero to be considered non-zero */ private static boolean nonzero(float value) { return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); } /** * Returns true if the transform matrix is the identity matrix. * Recomputes the matrix if necessary. * * @return True if the transform matrix is the identity matrix, false otherwise. */ final boolean hasIdentityMatrix() { if (mTransformationInfo != null) { updateMatrix(); return mTransformationInfo.mMatrixIsIdentity; } return true; } void ensureTransformationInfo() { if (mTransformationInfo == null) { mTransformationInfo = new TransformationInfo(); } } /** * Recomputes the transform matrix if necessary. */ private void updateMatrix() { final TransformationInfo info = mTransformationInfo; if (info == null) { return; } if (info.mMatrixDirty) { // transform-related properties have changed since the last time someone // asked for the matrix; recalculate it with the current values // Figure out if we need to update the pivot point if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { info.mPrevWidth = mRight - mLeft; info.mPrevHeight = mBottom - mTop; info.mPivotX = info.mPrevWidth / 2f; info.mPivotY = info.mPrevHeight / 2f; } } info.mMatrix.reset(); if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); } else { if (info.mCamera == null) { info.mCamera = new Camera(); info.matrix3D = new Matrix(); } info.mCamera.save(); info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); info.mCamera.getMatrix(info.matrix3D); info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, info.mPivotY + info.mTranslationY); info.mMatrix.postConcat(info.matrix3D); info.mCamera.restore(); } info.mMatrixDirty = false; info.mMatrixIsIdentity = info.mMatrix.isIdentity(); info.mInverseMatrixDirty = true; } } /** * Utility method to retrieve the inverse of the current mMatrix property. * We cache the matrix to avoid recalculating it when transform properties * have not changed. * * @return The inverse of the current matrix of this view. */ final Matrix getInverseMatrix() { final TransformationInfo info = mTransformationInfo; if (info != null) { updateMatrix(); if (info.mInverseMatrixDirty) { if (info.mInverseMatrix == null) { info.mInverseMatrix = new Matrix(); } info.mMatrix.invert(info.mInverseMatrix); info.mInverseMatrixDirty = false; } return info.mInverseMatrix; } return Matrix.IDENTITY_MATRIX; } /** * Gets the distance along the Z axis from the camera to this view. * * @see #setCameraDistance(float) * * @return The distance along the Z axis. */ public float getCameraDistance() { ensureTransformationInfo(); final float dpi = mResources.getDisplayMetrics().densityDpi; final TransformationInfo info = mTransformationInfo; if (info.mCamera == null) { info.mCamera = new Camera(); info.matrix3D = new Matrix(); } return -(info.mCamera.getLocationZ() * dpi); } /** *

Sets the distance along the Z axis (orthogonal to the X/Y plane on which * views are drawn) from the camera to this view. The camera's distance * affects 3D transformations, for instance rotations around the X and Y * axis. If the rotationX or rotationY properties are changed and this view is * large (more than half the size of the screen), it is recommended to always * use a camera distance that's greater than the height (X axis rotation) or * the width (Y axis rotation) of this view.

* *

The distance of the camera from the view plane can have an affect on the * perspective distortion of the view when it is rotated around the x or y axis. * For example, a large distance will result in a large viewing angle, and there * will not be much perspective distortion of the view as it rotates. A short * distance may cause much more perspective distortion upon rotation, and can * also result in some drawing artifacts if the rotated view ends up partially * behind the camera (which is why the recommendation is to use a distance at * least as far as the size of the view, if the view is to be rotated.)

* *

The distance is expressed in "depth pixels." The default distance depends * on the screen density. For instance, on a medium density display, the * default distance is 1280. On a high density display, the default distance * is 1920.

* *

If you want to specify a distance that leads to visually consistent * results across various densities, use the following formula:

*
     * float scale = context.getResources().getDisplayMetrics().density;     * view.setCameraDistance(distance * scale);     * 
* *

The density scale factor of a high density display is 1.5, * and 1920 = 1280 * 1.5.

* * @param distance The distance in "depth pixels", if negative the opposite * value is used * * @see #setRotationX(float) * @see #setRotationY(float) */ public void setCameraDistance(float distance) { invalidateViewProperty(true, false); ensureTransformationInfo(); final float dpi = mResources.getDisplayMetrics().densityDpi; final TransformationInfo info = mTransformationInfo; if (info.mCamera == null) { info.mCamera = new Camera(); info.matrix3D = new Matrix(); } info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); info.mMatrixDirty = true; invalidateViewProperty(false, false); if (mDisplayList != null) { mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } /** * The degrees that the view is rotated around the pivot point. * * @see #setRotation(float) * @see #getPivotX() * @see #getPivotY() * * @return The degrees of rotation. */ @ViewDebug.ExportedProperty(category = "drawing") public float getRotation() { return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; } /** * Sets the degrees that the view is rotated around the pivot point. Increasing values * result in clockwise rotation. * * @param rotation The degrees of rotation. * * @see #getRotation() * @see #getPivotX() * @see #getPivotY() * @see #setRotationX(float) * @see #setRotationY(float) * * @attr ref android.R.styleable#View_rotation */ public void setRotation(float rotation) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; if (info.mRotation != rotation) { // Double-invalidation is necessary to capture view's old and new areas invalidateViewProperty(true, false); info.mRotation = rotation; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setRotation(rotation); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The degrees that the view is rotated around the vertical axis through the pivot point. * * @see #getPivotX() * @see #getPivotY() * @see #setRotationY(float) * * @return The degrees of Y rotation. */ @ViewDebug.ExportedProperty(category = "drawing") public float getRotationY() { return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; } /** * Sets the degrees that the view is rotated around the vertical axis through the pivot point. * Increasing values result in counter-clockwise rotation from the viewpoint of looking * down the y axis. * * When rotating large views, it is recommended to adjust the camera distance * accordingly. Refer to {@link #setCameraDistance(float)} for more information. * * @param rotationY The degrees of Y rotation. * * @see #getRotationY() * @see #getPivotX() * @see #getPivotY() * @see #setRotation(float) * @see #setRotationX(float) * @see #setCameraDistance(float) * * @attr ref android.R.styleable#View_rotationY */ public void setRotationY(float rotationY) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; if (info.mRotationY != rotationY) { invalidateViewProperty(true, false); info.mRotationY = rotationY; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setRotationY(rotationY); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The degrees that the view is rotated around the horizontal axis through the pivot point. * * @see #getPivotX() * @see #getPivotY() * @see #setRotationX(float) * * @return The degrees of X rotation. */ @ViewDebug.ExportedProperty(category = "drawing") public float getRotationX() { return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; } /** * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. * Increasing values result in clockwise rotation from the viewpoint of looking down the * x axis. * * When rotating large views, it is recommended to adjust the camera distance * accordingly. Refer to {@link #setCameraDistance(float)} for more information. * * @param rotationX The degrees of X rotation. * * @see #getRotationX() * @see #getPivotX() * @see #getPivotY() * @see #setRotation(float) * @see #setRotationY(float) * @see #setCameraDistance(float) * * @attr ref android.R.styleable#View_rotationX */ public void setRotationX(float rotationX) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; if (info.mRotationX != rotationX) { invalidateViewProperty(true, false); info.mRotationX = rotationX; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setRotationX(rotationX); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The amount that the view is scaled in x around the pivot point, as a proportion of * the view's unscaled width. A value of 1, the default, means that no scaling is applied. * *

By default, this is 1.0f. * * @see #getPivotX() * @see #getPivotY() * @return The scaling factor. */ @ViewDebug.ExportedProperty(category = "drawing") public float getScaleX() { return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; } /** * Sets the amount that the view is scaled in x around the pivot point, as a proportion of * the view's unscaled width. A value of 1 means that no scaling is applied. * * @param scaleX The scaling factor. * @see #getPivotX() * @see #getPivotY() * * @attr ref android.R.styleable#View_scaleX */ public void setScaleX(float scaleX) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; if (info.mScaleX != scaleX) { invalidateViewProperty(true, false); info.mScaleX = scaleX; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setScaleX(scaleX); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The amount that the view is scaled in y around the pivot point, as a proportion of * the view's unscaled height. A value of 1, the default, means that no scaling is applied. * *

By default, this is 1.0f. * * @see #getPivotX() * @see #getPivotY() * @return The scaling factor. */ @ViewDebug.ExportedProperty(category = "drawing") public float getScaleY() { return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; } /** * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of * the view's unscaled width. A value of 1 means that no scaling is applied. * * @param scaleY The scaling factor. * @see #getPivotX() * @see #getPivotY() * * @attr ref android.R.styleable#View_scaleY */ public void setScaleY(float scaleY) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; if (info.mScaleY != scaleY) { invalidateViewProperty(true, false); info.mScaleY = scaleY; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setScaleY(scaleY); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The x location of the point around which the view is {@link #setRotation(float) rotated} * and {@link #setScaleX(float) scaled}. * * @see #getRotation() * @see #getScaleX() * @see #getScaleY() * @see #getPivotY() * @return The x location of the pivot point. * * @attr ref android.R.styleable#View_transformPivotX */ @ViewDebug.ExportedProperty(category = "drawing") public float getPivotX() { return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; } /** * Sets the x location of the point around which the view is * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. * By default, the pivot point is centered on the object. * Setting this property disables this behavior and causes the view to use only the * explicitly set pivotX and pivotY values. * * @param pivotX The x location of the pivot point. * @see #getRotation() * @see #getScaleX() * @see #getScaleY() * @see #getPivotY() * * @attr ref android.R.styleable#View_transformPivotX */ public void setPivotX(float pivotX) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; boolean pivotSet = (mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET; if (info.mPivotX != pivotX || !pivotSet) { mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; invalidateViewProperty(true, false); info.mPivotX = pivotX; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setPivotX(pivotX); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The y location of the point around which the view is {@link #setRotation(float) rotated} * and {@link #setScaleY(float) scaled}. * * @see #getRotation() * @see #getScaleX() * @see #getScaleY() * @see #getPivotY() * @return The y location of the pivot point. * * @attr ref android.R.styleable#View_transformPivotY */ @ViewDebug.ExportedProperty(category = "drawing") public float getPivotY() { return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; } /** * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. * Setting this property disables this behavior and causes the view to use only the * explicitly set pivotX and pivotY values. * * @param pivotY The y location of the pivot point. * @see #getRotation() * @see #getScaleX() * @see #getScaleY() * @see #getPivotY() * * @attr ref android.R.styleable#View_transformPivotY */ public void setPivotY(float pivotY) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; boolean pivotSet = (mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET; if (info.mPivotY != pivotY || !pivotSet) { mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; invalidateViewProperty(true, false); info.mPivotY = pivotY; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setPivotY(pivotY); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The opacity of the view. This is a value from 0 to 1, where 0 means the view is * completely transparent and 1 means the view is completely opaque. * *

By default this is 1.0f. * @return The opacity of the view. */ @ViewDebug.ExportedProperty(category = "drawing") public float getAlpha() { return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; } /** * Returns whether this View has content which overlaps. * *

This function, intended to be overridden by specific View types, is an optimization when * alpha is set on a view. If rendering overlaps in a view with alpha < 1, that view is drawn to * an offscreen buffer and then composited into place, which can be expensive. If the view has * no overlapping rendering, the view can draw each primitive with the appropriate alpha value * directly. An example of overlapping rendering is a TextView with a background image, such as * a Button. An example of non-overlapping rendering is a TextView with no background, or an * ImageView with only the foreground image. The default implementation returns true; subclasses * should override if they have cases which can be optimized.

* *

The current implementation of the saveLayer and saveLayerAlpha methods in {@link Canvas} * necessitates that a View return true if it uses the methods internally without passing the * {@link Canvas#CLIP_TO_LAYER_SAVE_FLAG}.

* * @return true if the content in this view might overlap, false otherwise. */ public boolean hasOverlappingRendering() { return true; } /** *

Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is * completely transparent and 1 means the view is completely opaque.

* *

Note that setting alpha to a translucent value (0 < alpha < 1) can have significant * performance implications, especially for large views. It is best to use the alpha property * sparingly and transiently, as in the case of fading animations.

* *

For a view with a frequently changing alpha, such as during a fading animation, it is * strongly recommended for performance reasons to either override * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.

* *

If this view overrides {@link #onSetAlpha(int)} to return true, then this view is * responsible for applying the opacity itself.

* *

Note that if the view is backed by a * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than * 1.0 will supercede the alpha of the layer paint.

* * @param alpha The opacity of the view. * * @see #hasOverlappingRendering() * @see #setLayerType(int, android.graphics.Paint) * * @attr ref android.R.styleable#View_alpha */ public void setAlpha(float alpha) { ensureTransformationInfo(); if (mTransformationInfo.mAlpha != alpha) { mTransformationInfo.mAlpha = alpha; if (onSetAlpha((int) (alpha * 255))) { mPrivateFlags |= PFLAG_ALPHA_SET; // subclass is handling alpha - don't optimize rendering cache invalidation invalidateParentCaches(); invalidate(true); } else { mPrivateFlags &= ~PFLAG_ALPHA_SET; invalidateViewProperty(true, false); if (mDisplayList != null) { mDisplayList.setAlpha(getFinalAlpha()); } } } } /** * Faster version of setAlpha() which performs the same steps except there are * no calls to invalidate(). The caller of this function should perform proper invalidation * on the parent and this object. The return value indicates whether the subclass handles * alpha (the return value for onSetAlpha()). * * @param alpha The new value for the alpha property * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and * the new value for the alpha property is different from the old value */ boolean setAlphaNoInvalidation(float alpha) { ensureTransformationInfo(); if (mTransformationInfo.mAlpha != alpha) { mTransformationInfo.mAlpha = alpha; boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); if (subclassHandlesAlpha) { mPrivateFlags |= PFLAG_ALPHA_SET; return true; } else { mPrivateFlags &= ~PFLAG_ALPHA_SET; if (mDisplayList != null) { mDisplayList.setAlpha(getFinalAlpha()); } } } return false; } /** * This property is hidden and intended only for use by the Fade transition, which * animates it to produce a visual translucency that does not side-effect (or get * affected by) the real alpha property. This value is composited with the other * alpha value (and the AlphaAnimation value, when that is present) to produce * a final visual translucency result, which is what is passed into the DisplayList. * * @hide */ public void setTransitionAlpha(float alpha) { ensureTransformationInfo(); if (mTransformationInfo.mTransitionAlpha != alpha) { mTransformationInfo.mTransitionAlpha = alpha; mPrivateFlags &= ~PFLAG_ALPHA_SET; invalidateViewProperty(true, false); if (mDisplayList != null) { mDisplayList.setAlpha(getFinalAlpha()); } } } /** * Calculates the visual alpha of this view, which is a combination of the actual * alpha value and the transitionAlpha value (if set). */ private float getFinalAlpha() { if (mTransformationInfo != null) { return mTransformationInfo.mAlpha * mTransformationInfo.mTransitionAlpha; } return 1; } /** * This property is hidden and intended only for use by the Fade transition, which * animates it to produce a visual translucency that does not side-effect (or get * affected by) the real alpha property. This value is composited with the other * alpha value (and the AlphaAnimation value, when that is present) to produce * a final visual translucency result, which is what is passed into the DisplayList. * * @hide */ public float getTransitionAlpha() { return mTransformationInfo != null ? mTransformationInfo.mTransitionAlpha : 1; } /** * Top position of this view relative to its parent. * * @return The top of this view, in pixels. */ @ViewDebug.CapturedViewProperty public final int getTop() { return mTop; } /** * Sets the top position of this view relative to its parent. This method is meant to be called * by the layout system and should not generally be called otherwise, because the property * may be changed at any time by the layout. * * @param top The top of this view, in pixels. */ public final void setTop(int top) { if (top != mTop) { updateMatrix(); final boolean matrixIsIdentity = mTransformationInfo == null || mTransformationInfo.mMatrixIsIdentity; if (matrixIsIdentity) { if (mAttachInfo != null) { int minTop; int yLoc; if (top < mTop) { minTop = top; yLoc = top - mTop; } else { minTop = mTop; yLoc = 0; } invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); } } else { // Double-invalidation is necessary to capture view's old and new areas invalidate(true); } int width = mRight - mLeft; int oldHeight = mBottom - mTop; mTop = top; if (mDisplayList != null) { mDisplayList.setTop(mTop); } sizeChange(width, mBottom - mTop, width, oldHeight); if (!matrixIsIdentity) { if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { // A change in dimension means an auto-centered pivot point changes, too mTransformationInfo.mMatrixDirty = true; } mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation invalidate(true); } mBackgroundSizeChanged = true; invalidateParentIfNeeded(); if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * Bottom position of this view relative to its parent. * * @return The bottom of this view, in pixels. */ @ViewDebug.CapturedViewProperty public final int getBottom() { return mBottom; } /** * True if this view has changed since the last time being drawn. * * @return The dirty state of this view. */ public boolean isDirty() { return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; } /** * Sets the bottom position of this view relative to its parent. This method is meant to be * called by the layout system and should not generally be called otherwise, because the * property may be changed at any time by the layout. * * @param bottom The bottom of this view, in pixels. */ public final void setBottom(int bottom) { if (bottom != mBottom) { updateMatrix(); final boolean matrixIsIdentity = mTransformationInfo == null || mTransformationInfo.mMatrixIsIdentity; if (matrixIsIdentity) { if (mAttachInfo != null) { int maxBottom; if (bottom < mBottom) { maxBottom = mBottom; } else { maxBottom = bottom; } invalidate(0, 0, mRight - mLeft, maxBottom - mTop); } } else { // Double-invalidation is necessary to capture view's old and new areas invalidate(true); } int width = mRight - mLeft; int oldHeight = mBottom - mTop; mBottom = bottom; if (mDisplayList != null) { mDisplayList.setBottom(mBottom); } sizeChange(width, mBottom - mTop, width, oldHeight); if (!matrixIsIdentity) { if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { // A change in dimension means an auto-centered pivot point changes, too mTransformationInfo.mMatrixDirty = true; } mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation invalidate(true); } mBackgroundSizeChanged = true; invalidateParentIfNeeded(); if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * Left position of this view relative to its parent. * * @return The left edge of this view, in pixels. */ @ViewDebug.CapturedViewProperty public final int getLeft() { return mLeft; } /** * Sets the left position of this view relative to its parent. This method is meant to be called * by the layout system and should not generally be called otherwise, because the property * may be changed at any time by the layout. * * @param left The bottom of this view, in pixels. */ public final void setLeft(int left) { if (left != mLeft) { updateMatrix(); final boolean matrixIsIdentity = mTransformationInfo == null || mTransformationInfo.mMatrixIsIdentity; if (matrixIsIdentity) { if (mAttachInfo != null) { int minLeft; int xLoc; if (left < mLeft) { minLeft = left; xLoc = left - mLeft; } else { minLeft = mLeft; xLoc = 0; } invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); } } else { // Double-invalidation is necessary to capture view's old and new areas invalidate(true); } int oldWidth = mRight - mLeft; int height = mBottom - mTop; mLeft = left; if (mDisplayList != null) { mDisplayList.setLeft(left); } sizeChange(mRight - mLeft, height, oldWidth, height); if (!matrixIsIdentity) { if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { // A change in dimension means an auto-centered pivot point changes, too mTransformationInfo.mMatrixDirty = true; } mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation invalidate(true); } mBackgroundSizeChanged = true; invalidateParentIfNeeded(); if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * Right position of this view relative to its parent. * * @return The right edge of this view, in pixels. */ @ViewDebug.CapturedViewProperty public final int getRight() { return mRight; } /** * Sets the right position of this view relative to its parent. This method is meant to be called * by the layout system and should not generally be called otherwise, because the property * may be changed at any time by the layout. * * @param right The bottom of this view, in pixels. */ public final void setRight(int right) { if (right != mRight) { updateMatrix(); final boolean matrixIsIdentity = mTransformationInfo == null || mTransformationInfo.mMatrixIsIdentity; if (matrixIsIdentity) { if (mAttachInfo != null) { int maxRight; if (right < mRight) { maxRight = mRight; } else { maxRight = right; } invalidate(0, 0, maxRight - mLeft, mBottom - mTop); } } else { // Double-invalidation is necessary to capture view's old and new areas invalidate(true); } int oldWidth = mRight - mLeft; int height = mBottom - mTop; mRight = right; if (mDisplayList != null) { mDisplayList.setRight(mRight); } sizeChange(mRight - mLeft, height, oldWidth, height); if (!matrixIsIdentity) { if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { // A change in dimension means an auto-centered pivot point changes, too mTransformationInfo.mMatrixDirty = true; } mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation invalidate(true); } mBackgroundSizeChanged = true; invalidateParentIfNeeded(); if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The visual x position of this view, in pixels. This is equivalent to the * {@link #setTranslationX(float) translationX} property plus the current * {@link #getLeft() left} property. * * @return The visual x position of this view, in pixels. */ @ViewDebug.ExportedProperty(category = "drawing") public float getX() { return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); } /** * Sets the visual x position of this view, in pixels. This is equivalent to setting the * {@link #setTranslationX(float) translationX} property to be the difference between * the x value passed in and the current {@link #getLeft() left} property. * * @param x The visual x position of this view, in pixels. */ public void setX(float x) { setTranslationX(x - mLeft); } /** * The visual y position of this view, in pixels. This is equivalent to the * {@link #setTranslationY(float) translationY} property plus the current * {@link #getTop() top} property. * * @return The visual y position of this view, in pixels. */ @ViewDebug.ExportedProperty(category = "drawing") public float getY() { return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); } /** * Sets the visual y position of this view, in pixels. This is equivalent to setting the * {@link #setTranslationY(float) translationY} property to be the difference between * the y value passed in and the current {@link #getTop() top} property. * * @param y The visual y position of this view, in pixels. */ public void setY(float y) { setTranslationY(y - mTop); } /** * The horizontal location of this view relative to its {@link #getLeft() left} position. * This position is post-layout, in addition to wherever the object's * layout placed it. * * @return The horizontal position of this view relative to its left position, in pixels. */ @ViewDebug.ExportedProperty(category = "drawing") public float getTranslationX() { return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; } /** * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. * This effectively positions the object post-layout, in addition to wherever the object's * layout placed it. * * @param translationX The horizontal position of this view relative to its left position, * in pixels. * * @attr ref android.R.styleable#View_translationX */ public void setTranslationX(float translationX) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; if (info.mTranslationX != translationX) { // Double-invalidation is necessary to capture view's old and new areas invalidateViewProperty(true, false); info.mTranslationX = translationX; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setTranslationX(translationX); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * The horizontal location of this view relative to its {@link #getTop() top} position. * This position is post-layout, in addition to wherever the object's * layout placed it. * * @return The vertical position of this view relative to its top position, * in pixels. */ @ViewDebug.ExportedProperty(category = "drawing") public float getTranslationY() { return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; } /** * Sets the vertical location of this view relative to its {@link #getTop() top} position. * This effectively positions the object post-layout, in addition to wherever the object's * layout placed it. * * @param translationY The vertical position of this view relative to its top position, * in pixels. * * @attr ref android.R.styleable#View_translationY */ public void setTranslationY(float translationY) { ensureTransformationInfo(); final TransformationInfo info = mTransformationInfo; if (info.mTranslationY != translationY) { invalidateViewProperty(true, false); info.mTranslationY = translationY; info.mMatrixDirty = true; invalidateViewProperty(false, true); if (mDisplayList != null) { mDisplayList.setTranslationY(translationY); } if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { // View was rejected last time it was drawn by its parent; this may have changed invalidateParentIfNeeded(); } } } /** * Hit rectangle in parent's coordinates * * @param outRect The hit rectangle of the view. */ public void getHitRect(Rect outRect) { updateMatrix(); final TransformationInfo info = mTransformationInfo; if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { outRect.set(mLeft, mTop, mRight, mBottom); } else { final RectF tmpRect = mAttachInfo.mTmpTransformRect; tmpRect.set(0, 0, getWidth(), getHeight()); info.mMatrix.mapRect(tmpRect); outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); } } /** * Determines whether the given point, in local coordinates is inside the view. */ /*package*/ final boolean pointInView(float localX, float localY) { return localX >= 0 && localX < (mRight - mLeft) && localY >= 0 && localY < (mBottom - mTop); } /** * Utility method to determine whether the given point, in local coordinates, * is inside the view, where the area of the view is expanded by the slop factor. * This method is called while processing touch-move events to determine if the event * is still within the view. * * @hide */ public boolean pointInView(float localX, float localY, float slop) { return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && localY < ((mBottom - mTop) + slop); } /** * When a view has focus and the user navigates away from it, the next view is searched for * starting from the rectangle filled in by this method. * * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) * of the view. However, if your view maintains some idea of internal selection, * such as a cursor, or a selected row or column, you should override this method and * fill in a more specific rectangle. * * @param r The rectangle to fill in, in this view's coordinates. */ public void getFocusedRect(Rect r) { getDrawingRect(r); } /** * If some part of this view is not clipped by any of its parents, then * return that area in r in global (root) coordinates. To convert r to local * coordinates (without taking possible View rotations into account), offset * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). * If the view is completely clipped or translated out, return false. * * @param r If true is returned, r holds the global coordinates of the * visible portion of this view. * @param globalOffset If true is returned, globalOffset holds the dx,dy * between this view and its root. globalOffet may be null. * @return true if r is non-empty (i.e. part of the view is visible at the * root level. */ public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { int width = mRight - mLeft; int height = mBottom - mTop; if (width > 0 && height > 0) { r.set(0, 0, width, height); if (globalOffset != null) { globalOffset.set(-mScrollX, -mScrollY); } return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); } return false; } public final boolean getGlobalVisibleRect(Rect r) { return getGlobalVisibleRect(r, null); } public final boolean getLocalVisibleRect(Rect r) { final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); if (getGlobalVisibleRect(r, offset)) { r.offset(-offset.x, -offset.y); // make r local return true; } return false; } /** * Offset this view's vertical location by the specified number of pixels. * * @param offset the number of pixels to offset the view by */ public void offsetTopAndBottom(int offset) { if (offset != 0) { updateMatrix(); final boolean matrixIsIdentity = mTransformationInfo == null || mTransformationInfo.mMatrixIsIdentity; if (matrixIsIdentity) { if (mDisplayList != null) { invalidateViewProperty(false, false); } else { final ViewParent p = mParent; if (p != null && mAttachInfo != null) { final Rect r = mAttachInfo.mTmpInvalRect; int minTop; int maxBottom; int yLoc; if (offset < 0) { minTop = mTop + offset; maxBottom = mBottom; yLoc = offset; } else { minTop = mTop; maxBottom = mBottom + offset; yLoc = 0; } r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); p.invalidateChild(this, r); } } } else { invalidateViewProperty(false, false); } mTop += offset; mBottom += offset; if (mDisplayList != null) { mDisplayList.offsetTopAndBottom(offset); invalidateViewProperty(false, false); } else { if (!matrixIsIdentity) { invalidateViewProperty(false, true); } invalidateParentIfNeeded(); } } } /** * Offset this view's horizontal location by the specified amount of pixels. * * @param offset the number of pixels to offset the view by */ public void offsetLeftAndRight(int offset) { if (offset != 0) { updateMatrix(); final boolean matrixIsIdentity = mTransformationInfo == null || mTransformationInfo.mMatrixIsIdentity; if (matrixIsIdentity) { if (mDisplayList != null) { invalidateViewProperty(false, false); } else { final ViewParent p = mParent; if (p != null && mAttachInfo != null) { final Rect r = mAttachInfo.mTmpInvalRect; int minLeft; int maxRight; if (offset < 0) { minLeft = mLeft + offset; maxRight = mRight; } else { minLeft = mLeft; maxRight = mRight + offset; } r.set(0, 0, maxRight - minLeft, mBottom - mTop); p.invalidateChild(this, r); } } } else { invalidateViewProperty(false, false); } mLeft += offset; mRight += offset; if (mDisplayList != null) { mDisplayList.offsetLeftAndRight(offset); invalidateViewProperty(false, false); } else { if (!matrixIsIdentity) { invalidateViewProperty(false, true); } invalidateParentIfNeeded(); } } } /** * Get the LayoutParams associated with this view. All views should have * layout parameters. These supply parameters to the parent of this * view specifying how it should be arranged. There are many subclasses of * ViewGroup.LayoutParams, and these correspond to the different subclasses * of ViewGroup that are responsible for arranging their children. * * This method may return null if this View is not attached to a parent * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} * was not invoked successfully. When a View is attached to a parent * ViewGroup, this method must not return null. * * @return The LayoutParams associated with this view, or null if no * parameters have been set yet */ @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") public ViewGroup.LayoutParams getLayoutParams() { return mLayoutParams; } /** * Set the layout parameters associated with this view. These supply * parameters to the parent of this view specifying how it should be * arranged. There are many subclasses of ViewGroup.LayoutParams, and these * correspond to the different subclasses of ViewGroup that are responsible * for arranging their children. * * @param params The layout parameters for this view, cannot be null */ public void setLayoutParams(ViewGroup.LayoutParams params) { if (params == null) { throw new NullPointerException("Layout parameters cannot be null"); } mLayoutParams = params; resolveLayoutParams(); if (mParent instanceof ViewGroup) { ((ViewGroup) mParent).onSetLayoutParams(this, params); } requestLayout(); } /** * Resolve the layout parameters depending on the resolved layout direction * * @hide */ public void resolveLayoutParams() { if (mLayoutParams != null) { mLayoutParams.resolveLayoutDirection(getLayoutDirection()); } } /** * Set the scrolled position of your view. This will cause a call to * {@link #onScrollChanged(int, int, int, int)} and the view will be * invalidated. * @param x the x position to scroll to * @param y the y position to scroll to */ public void scrollTo(int x, int y) { if (mScrollX != x || mScrollY != y) { int oldX = mScrollX; int oldY = mScrollY; mScrollX = x; mScrollY = y; invalidateParentCaches(); onScrollChanged(mScrollX, mScrollY, oldX, oldY); if (!awakenScrollBars()) { postInvalidateOnAnimation(); } } } /** * Move the scrolled position of your view. This will cause a call to * {@link #onScrollChanged(int, int, int, int)} and the view will be * invalidated. * @param x the amount of pixels to scroll by horizontally * @param y the amount of pixels to scroll by vertically */ public void scrollBy(int x, int y) { scrollTo(mScrollX + x, mScrollY + y); } /** *

Trigger the scrollbars to draw. When invoked this method starts an * animation to fade the scrollbars out after a default delay. If a subclass * provides animated scrolling, the start delay should equal the duration * of the scrolling animation.

* *

The animation starts only if at least one of the scrollbars is * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and * {@link #isVerticalScrollBarEnabled()}. When the animation is started, * this method returns true, and false otherwise. If the animation is * started, this method calls {@link #invalidate()}; in that case the * caller should not call {@link #invalidate()}.

* *

This method should be invoked every time a subclass directly updates * the scroll parameters.

* *

This method is automatically invoked by {@link #scrollBy(int, int)} * and {@link #scrollTo(int, int)}.

* * @return true if the animation is played, false otherwise * * @see #awakenScrollBars(int) * @see #scrollBy(int, int) * @see #scrollTo(int, int) * @see #isHorizontalScrollBarEnabled() * @see #isVerticalScrollBarEnabled() * @see #setHorizontalScrollBarEnabled(boolean) * @see #setVerticalScrollBarEnabled(boolean) */ protected boolean awakenScrollBars() { return mScrollCache != null && awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); } /** * Trigger the scrollbars to draw. * This method differs from awakenScrollBars() only in its default duration. * initialAwakenScrollBars() will show the scroll bars for longer than * usual to give the user more of a chance to notice them. * * @return true if the animation is played, false otherwise. */ private boolean initialAwakenScrollBars() { return mScrollCache != null && awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); } /** *

* Trigger the scrollbars to draw. When invoked this method starts an * animation to fade the scrollbars out after a fixed delay. If a subclass * provides animated scrolling, the start delay should equal the duration of * the scrolling animation. *

* *

* The animation starts only if at least one of the scrollbars is enabled, * as specified by {@link #isHorizontalScrollBarEnabled()} and * {@link #isVerticalScrollBarEnabled()}. When the animation is started, * this method returns true, and false otherwise. If the animation is * started, this method calls {@link #invalidate()}; in that case the caller * should not call {@link #invalidate()}. *

* *

* This method should be invoked everytime a subclass directly updates the * scroll parameters. *

* * @param startDelay the delay, in milliseconds, after which the animation * should start; when the delay is 0, the animation starts * immediately * @return true if the animation is played, false otherwise * * @see #scrollBy(int, int) * @see #scrollTo(int, int) * @see #isHorizontalScrollBarEnabled() * @see #isVerticalScrollBarEnabled() * @see #setHorizontalScrollBarEnabled(boolean) * @see #setVerticalScrollBarEnabled(boolean) */ protected boolean awakenScrollBars(int startDelay) { return awakenScrollBars(startDelay, true); } /** *

* Trigger the scrollbars to draw. When invoked this method starts an * animation to fade the scrollbars out after a fixed delay. If a subclass * provides animated scrolling, the start delay should equal the duration of * the scrolling animation. *

* *

* The animation starts only if at least one of the scrollbars is enabled, * as specified by {@link #isHorizontalScrollBarEnabled()} and * {@link #isVerticalScrollBarEnabled()}. When the animation is started, * this method returns true, and false otherwise. If the animation is * started, this method calls {@link #invalidate()} if the invalidate parameter * is set to true; in that case the caller * should not call {@link #invalidate()}. *

* *

* This method should be invoked everytime a subclass directly updates the * scroll parameters. *

* * @param startDelay the delay, in milliseconds, after which the animation * should start; when the delay is 0, the animation starts * immediately * * @param invalidate Wheter this method should call invalidate * * @return true if the animation is played, false otherwise * * @see #scrollBy(int, int) * @see #scrollTo(int, int) * @see #isHorizontalScrollBarEnabled() * @see #isVerticalScrollBarEnabled() * @see #setHorizontalScrollBarEnabled(boolean) * @see #setVerticalScrollBarEnabled(boolean) */ protected boolean awakenScrollBars(int startDelay, boolean invalidate) { final ScrollabilityCache scrollCache = mScrollCache; if (scrollCache == null || !scrollCache.fadeScrollBars) { return false; } if (scrollCache.scrollBar == null) { scrollCache.scrollBar = new ScrollBarDrawable(); } if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { if (invalidate) { // Invalidate to show the scrollbars postInvalidateOnAnimation(); } if (scrollCache.state == ScrollabilityCache.OFF) { // FIXME: this is copied from WindowManagerService. // We should get this value from the system when it // is possible to do so. final int KEY_REPEAT_FIRST_DELAY = 750; startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); } // Tell mScrollCache when we should start fading. This may // extend the fade start time if one was already scheduled long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; scrollCache.fadeStartTime = fadeStartTime; scrollCache.state = ScrollabilityCache.ON; // Schedule our fader to run, unscheduling any old ones first if (mAttachInfo != null) { mAttachInfo.mHandler.removeCallbacks(scrollCache); mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); } return true; } return false; } /** * Do not invalidate views which are not visible and which are not running an animation. They * will not get drawn and they should not set dirty flags as if they will be drawn */ private boolean skipInvalidate() { return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && (!(mParent instanceof ViewGroup) || !((ViewGroup) mParent).isViewTransitioning(this)); } /** * Mark the area defined by dirty as needing to be drawn. If the view is * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point * in the future. This must be called from a UI thread. To call from a non-UI * thread, call {@link #postInvalidate()}. * * WARNING: This method is destructive to dirty. * @param dirty the rectangle representing the bounds of the dirty region */ public void invalidate(Rect dirty) { if (skipInvalidate()) { return; } if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; mPrivateFlags |= PFLAG_INVALIDATED; mPrivateFlags |= PFLAG_DIRTY; final ViewParent p = mParent; final AttachInfo ai = mAttachInfo; //noinspection PointlessBooleanExpression,ConstantConditions if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { if (p != null && ai != null && ai.mHardwareAccelerated) { // fast-track for GL-enabled applications; just invalidate the whole hierarchy // with a null dirty rect, which tells the ViewAncestor to redraw everything p.invalidateChild(this, null); return; } } if (p != null && ai != null) { final int scrollX = mScrollX; final int scrollY = mScrollY; final Rect r = ai.mTmpInvalRect; r.set(dirty.left - scrollX, dirty.top - scrollY, dirty.right - scrollX, dirty.bottom - scrollY); mParent.invalidateChild(this, r); } } } /** * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. * The coordinates of the dirty rect are relative to the view. * If the view is visible, {@link #onDraw(android.graphics.Canvas)} * will be called at some point in the future. This must be called from * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. * @param l the left position of the dirty region * @param t the top position of the dirty region * @param r the right position of the dirty region * @param b the bottom position of the dirty region */ public void invalidate(int l, int t, int r, int b) { if (skipInvalidate()) { return; } if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; mPrivateFlags |= PFLAG_INVALIDATED; mPrivateFlags |= PFLAG_DIRTY; final ViewParent p = mParent; final AttachInfo ai = mAttachInfo; //noinspection PointlessBooleanExpression,ConstantConditions if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { if (p != null && ai != null && ai.mHardwareAccelerated) { // fast-track for GL-enabled applications; just invalidate the whole hierarchy // with a null dirty rect, which tells the ViewAncestor to redraw everything p.invalidateChild(this, null); return; } } if (p != null && ai != null && l < r && t < b) { final int scrollX = mScrollX; final int scrollY = mScrollY; final Rect tmpr = ai.mTmpInvalRect; tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); p.invalidateChild(this, tmpr); } } } /** * Invalidate the whole view. If the view is visible, * {@link #onDraw(android.graphics.Canvas)} will be called at some point in * the future. This must be called from a UI thread. To call from a non-UI thread, * call {@link #postInvalidate()}. */ public void invalidate() { invalidate(true); } /** * This is where the invalidate() work actually happens. A full invalidate() * causes the drawing cache to be invalidated, but this function can be called with * invalidateCache set to false to skip that invalidation step for cases that do not * need it (for example, a component that remains at the same dimensions with the same * content). * * @param invalidateCache Whether the drawing cache for this view should be invalidated as * well. This is usually true for a full invalidate, but may be set to false if the * View's contents or dimensions have not changed. */ void invalidate(boolean invalidateCache) { if (skipInvalidate()) { return; } if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { mLastIsOpaque = isOpaque(); mPrivateFlags &= ~PFLAG_DRAWN; mPrivateFlags |= PFLAG_DIRTY; if (invalidateCache) { mPrivateFlags |= PFLAG_INVALIDATED; mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; } final AttachInfo ai = mAttachInfo; final ViewParent p = mParent; //noinspection PointlessBooleanExpression,ConstantConditions if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { if (p != null && ai != null && ai.mHardwareAccelerated) { // fast-track for GL-enabled applications; just invalidate the whole hierarchy // with a null dirty rect, which tells the ViewAncestor to redraw everything p.invalidateChild(this, null); return; } } if (p != null && ai != null) { final Rect r = ai.mTmpInvalRect; r.set(0, 0, mRight - mLeft, mBottom - mTop); // Don't call invalidate -- we don't want to internally scroll // our own bounds p.invalidateChild(this, r); } } } /** * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to * set any flags or handle all of the cases handled by the default invalidation methods. * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate * dirty rect. This method calls into fast invalidation methods in ViewGroup that * walk up the hierarchy, transforming the dirty rect as necessary. * * The method also handles normal invalidation logic if display list properties are not * being used in this view. The invalidateParent and forceRedraw flags are used by that * backup approach, to handle these cases used in the various property-setting methods. * * @param invalidateParent Force a call to invalidateParentCaches() if display list properties * are not being used in this view * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display * list properties are not being used in this view */ void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { if (invalidateParent) { invalidateParentCaches(); } if (forceRedraw) { mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation } invalidate(false); } else { final AttachInfo ai = mAttachInfo; final ViewParent p = mParent; if (p != null && ai != null) { final Rect r = ai.mTmpInvalRect; r.set(0, 0, mRight - mLeft, mBottom - mTop); if (mParent instanceof ViewGroup) { ((ViewGroup) mParent).invalidateChildFast(this, r); } else { mParent.invalidateChild(this, r); } } } } /** * Utility method to transform a given Rect by the current matrix of this view. */ void transformRect(final Rect rect) { if (!getMatrix().isIdentity()) { RectF boundingRect = mAttachInfo.mTmpTransformRect; boundingRect.set(rect); getMatrix().mapRect(boundingRect); rect.set((int) Math.floor(boundingRect.left), (int) Math.floor(boundingRect.top), (int) Math.ceil(boundingRect.right), (int) Math.ceil(boundingRect.bottom)); } } /** * Used to indicate that the parent of this view should clear its caches. This functionality * is used to force the parent to rebuild its display list (when hardware-accelerated), * which is necessary when various parent-managed properties of the view change, such as * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only * clears the parent caches and does not causes an invalidate event. * * @hide */ protected void invalidateParentCaches() { if (mParent instanceof View) { ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; } } /** * Used to indicate that the parent of this view should be invalidated. This functionality * is used to force the parent to rebuild its display list (when hardware-accelerated), * which is necessary when various parent-managed properties of the view change, such as * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate * an invalidation event to the parent. * * @hide */ protected void invalidateParentIfNeeded() { if (isHardwareAccelerated() && mParent instanceof View) { ((View) mParent).invalidate(true); } } /** * Indicates whether this View is opaque. An opaque View guarantees that it will * draw all the pixels overlapping its bounds using a fully opaque color. * * Subclasses of View should override this method whenever possible to indicate * whether an instance is opaque. Opaque Views are treated in a special way by * the View hierarchy, possibly allowing it to perform optimizations during * invalidate/draw passes. * * @return True if this View is guaranteed to be fully opaque, false otherwise. */ @ViewDebug.ExportedProperty(category = "drawing") public boolean isOpaque() { return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && getFinalAlpha() >= 1.0f; } /** * @hide */ protected void computeOpaqueFlags() { // Opaque if: // - Has a background // - Background is opaque // - Doesn't have scrollbars or scrollbars overlay if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; } else { mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; } final int flags = mViewFlags; if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; } else { mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; } } /** * @hide */ protected boolean hasOpaqueScrollbars() { return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; } /** * @return A handler associated with the thread running the View. This * handler can be used to pump events in the UI events queue. */ public Handler getHandler() { final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { return attachInfo.mHandler; } return null; } /** * Gets the view root associated with the View. * @return The view root, or null if none. * @hide */ public ViewRootImpl getViewRootImpl() { if (mAttachInfo != null) { return mAttachInfo.mViewRootImpl; } return null; } /** *

Causes the Runnable to be added to the message queue. * The runnable will be run on the user interface thread.

* * @param action The Runnable that will be executed. * * @return Returns true if the Runnable was successfully placed in to the * message queue. Returns false on failure, usually because the * looper processing the message queue is exiting. * * @see #postDelayed * @see #removeCallbacks */ public boolean post(Runnable action) { final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { return attachInfo.mHandler.post(action); } // Assume that post will succeed later ViewRootImpl.getRunQueue().post(action); return true; } /** *

Causes the Runnable to be added to the message queue, to be run * after the specified amount of time elapses. * The runnable will be run on the user interface thread.

* * @param action The Runnable that will be executed. * @param delayMillis The delay (in milliseconds) until the Runnable * will be executed. * * @return true if the Runnable was successfully placed in to the * message queue. Returns false on failure, usually because the * looper processing the message queue is exiting. Note that a * result of true does not mean the Runnable will be processed -- * if the looper is quit before the delivery time of the message * occurs then the message will be dropped. * * @see #post * @see #removeCallbacks */ public boolean postDelayed(Runnable action, long delayMillis) { final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { return attachInfo.mHandler.postDelayed(action, delayMillis); } // Assume that post will succeed later ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); return true; } /** *

Causes the Runnable to execute on the next animation time step. * The runnable will be run on the user interface thread.

* * @param action The Runnable that will be executed. * * @see #postOnAnimationDelayed * @see #removeCallbacks */ public void postOnAnimation(Runnable action) { final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { attachInfo.mViewRootImpl.mChoreographer.postCallback( Choreographer.CALLBACK_ANIMATION, action, null); } else { // Assume that post will succeed later ViewRootImpl.getRunQueue().post(action); } } /** *

Causes the Runnable to execute on the next animation time step, * after the specified amount of time elapses. * The runnable will be run on the user interface thread.

* * @param action The Runnable that will be executed. * @param delayMillis The delay (in milliseconds) until the Runnable * will be executed. * * @see #postOnAnimation * @see #removeCallbacks */ public void postOnAnimationDelayed(Runnable action, long delayMillis) { final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); } else { // Assume that post will succeed later ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); } } /** *

Removes the specified Runnable from the message queue.

* * @param action The Runnable to remove from the message handling queue * * @return true if this view could ask the Handler to remove the Runnable, * false otherwise. When the returned value is true, the Runnable * may or may not have been actually removed from the message queue * (for instance, if the Runnable was not in the queue already.) * * @see #post * @see #postDelayed * @see #postOnAnimation * @see #postOnAnimationDelayed */ public boolean removeCallbacks(Runnable action) { if (action != null) { final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { attachInfo.mHandler.removeCallbacks(action); attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( Choreographer.CALLBACK_ANIMATION, action, null); } else { // Assume that post will succeed later ViewRootImpl.getRunQueue().removeCallbacks(action); } } return true; } /** *

Cause an invalidate to happen on a subsequent cycle through the event loop. * Use this to invalidate the View from a non-UI thread.

* *

This method can be invoked from outside of the UI thread * only when this View is attached to a window.

* * @see #invalidate() * @see #postInvalidateDelayed(long) */ public void postInvalidate() { postInvalidateDelayed(0); } /** *

Cause an invalidate of the specified area to happen on a subsequent cycle * through the event loop. Use this to invalidate the View from a non-UI thread.

* *

This method can be invoked from outside of the UI thread * only when this View is attached to a window.

* * @param left The left coordinate of the rectangle to invalidate. * @param top The top coordinate of the rectangle to invalidate. * @param right The right coordinate of the rectangle to invalidate. * @param bottom The bottom coordinate of the rectangle to invalidate. * * @see #invalidate(int, int, int, int) * @see #invalidate(Rect) * @see #postInvalidateDelayed(long, int, int, int, int) */ public void postInvalidate(int left, int top, int right, int bottom) { postInvalidateDelayed(0, left, top, right, bottom); } /** *

Cause an invalidate to happen on a subsequent cycle through the event * loop. Waits for the specified amount of time.

* *

This method can be invoked from outside of the UI thread * only when this View is attached to a window.

* * @param delayMilliseconds the duration in milliseconds to delay the * invalidation by * * @see #invalidate() * @see #postInvalidate() */ public void postInvalidateDelayed(long delayMilliseconds) { // We try only with the AttachInfo because there's no point in invalidating // if we are not attached to our window final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); } } /** *

Cause an invalidate of the specified area to happen on a subsequent cycle * through the event loop. Waits for the specified amount of time.

* *

This method can be invoked from outside of the UI thread * only when this View is attached to a window.

* * @param delayMilliseconds the duration in milliseconds to delay the * invalidation by * @param left The left coordinate of the rectangle to invalidate. * @param top The top coordinate of the rectangle to invalidate. * @param right The right coordinate of the rectangle to invalidate. * @param bottom The bottom coordinate of the rectangle to invalidate. * * @see #invalidate(int, int, int, int) * @see #invalidate(Rect) * @see #postInvalidate(int, int, int, int) */ public void postInvalidateDelayed(long delayMilliseconds, int left, int top, int right, int bottom) { // We try only with the AttachInfo because there's no point in invalidating // if we are not attached to our window final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); info.target = this; info.left = left; info.top = top; info.right = right; info.bottom = bottom; attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); } } /** *

Cause an invalidate to happen on the next animation time step, typically the * next display frame.

* *

This method can be invoked from outside of the UI thread * only when this View is attached to a window.

* * @see #invalidate() */ public void postInvalidateOnAnimation() { // We try only with the AttachInfo because there's no point in invalidating // if we are not attached to our window final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); } } /** *

Cause an invalidate of the specified area to happen on the next animation * time step, typically the next display frame.

* *

This method can be invoked from outside of the UI thread * only when this View is attached to a window.

* * @param left The left coordinate of the rectangle to invalidate. * @param top The top coordinate of the rectangle to invalidate. * @param right The right coordinate of the rectangle to invalidate. * @param bottom The bottom coordinate of the rectangle to invalidate. * * @see #invalidate(int, int, int, int) * @see #invalidate(Rect) */ public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { // We try only with the AttachInfo because there's no point in invalidating // if we are not attached to our window final AttachInfo attachInfo = mAttachInfo; if (attachInfo != null) { final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); info.target = this; info.left = left; info.top = top; info.right = right; info.bottom = bottom; attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); } } /** * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. * This event is sent at most once every * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. */ private void postSendViewScrolledAccessibilityEventCallback() { if (mSendViewScrolledAccessibilityEvent == null) { mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); } if (!mSendViewScrolledAccessibilityEvent.mIsPending) { mSendViewScrolledAccessibilityEvent.mIsPending = true; postDelayed(mSendViewScrolledAccessibilityEvent, ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); } } /** * Called by a parent to request that a child update its values for mScrollX * and mScrollY if necessary. This will typically be done if the child is * animating a scroll using a {@link android.widget.Scroller Scroller} * object. */ public void computeScroll() { } /** *

Indicate whether the horizontal edges are faded when the view is * scrolled horizontally.

* * @return true if the horizontal edges should are faded on scroll, false * otherwise * * @see #setHorizontalFadingEdgeEnabled(boolean) * * @attr ref android.R.styleable#View_requiresFadingEdge */ public boolean isHorizontalFadingEdgeEnabled() { return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; } /** *

Define whether the horizontal edges should be faded when this view * is scrolled horizontally.

* * @param horizontalFadingEdgeEnabled true if the horizontal edges should * be faded when the view is scrolled * horizontally * * @see #isHorizontalFadingEdgeEnabled() * * @attr ref android.R.styleable#View_requiresFadingEdge */ public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { if (horizontalFadingEdgeEnabled) { initScrollCache(); } mViewFlags ^= FADING_EDGE_HORIZONTAL; } } /** *

Indicate whether the vertical edges are faded when the view is * scrolled horizontally.

* * @return true if the vertical edges should are faded on scroll, false * otherwise * * @see #setVerticalFadingEdgeEnabled(boolean) * * @attr ref android.R.styleable#View_requiresFadingEdge */ public boolean isVerticalFadingEdgeEnabled() { return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; } /** *

Define whether the vertical edges should be faded when this view * is scrolled vertically.

* * @param verticalFadingEdgeEnabled true if the vertical edges should * be faded when the view is scrolled * vertically * * @see #isVerticalFadingEdgeEnabled() * * @attr ref android.R.styleable#View_requiresFadingEdge */ public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { if (verticalFadingEdgeEnabled) { initScrollCache(); } mViewFlags ^= FADING_EDGE_VERTICAL; } } /** * Returns the strength, or intensity, of the top faded edge. The strength is * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation * returns 0.0 or 1.0 but no value in between. * * Subclasses should override this method to provide a smoother fade transition * when scrolling occurs. * * @return the intensity of the top fade as a float between 0.0f and 1.0f */ protected float getTopFadingEdgeStrength() { return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; } /** * Returns the strength, or intensity, of the bottom faded edge. The strength is * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation * returns 0.0 or 1.0 but no value in between. * * Subclasses should override this method to provide a smoother fade transition * when scrolling occurs. * * @return the intensity of the bottom fade as a float between 0.0f and 1.0f */ protected float getBottomFadingEdgeStrength() { return computeVerticalScrollOffset() + computeVerticalScrollExtent() < computeVerticalScrollRange() ? 1.0f : 0.0f; } /** * Returns the strength, or intensity, of the left faded edge. The strength is * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation * returns 0.0 or 1.0 but no value in between. * * Subclasses should override this method to provide a smoother fade transition * when scrolling occurs. * * @return the intensity of the left fade as a float between 0.0f and 1.0f */ protected float getLeftFadingEdgeStrength() { return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; } /** * Returns the strength, or intensity, of the right faded edge. The strength is * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation * returns 0.0 or 1.0 but no value in between. * * Subclasses should override this method to provide a smoother fade transition * when scrolling occurs. * * @return the intensity of the right fade as a float between 0.0f and 1.0f */ protected float getRightFadingEdgeStrength() { return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < computeHorizontalScrollRange() ? 1.0f : 0.0f; } /** *

Indicate whether the horizontal scrollbar should be drawn or not. The * scrollbar is not drawn by default.

* * @return true if the horizontal scrollbar should be painted, false * otherwise * * @see #setHorizontalScrollBarEnabled(boolean) */ public boolean isHorizontalScrollBarEnabled() { return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; } /** *

Define whether the horizontal scrollbar should be drawn or not. The * scrollbar is not drawn by default.

* * @param horizontalScrollBarEnabled true if the horizontal scrollbar should * be painted * * @see #isHorizontalScrollBarEnabled() */ public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { mViewFlags ^= SCROLLBARS_HORIZONTAL; computeOpaqueFlags(); resolvePadding(); } } /** *

Indicate whether the vertical scrollbar should be drawn or not. The * scrollbar is not drawn by default.

* * @return true if the vertical scrollbar should be painted, false * otherwise * * @see #setVerticalScrollBarEnabled(boolean) */ public boolean isVerticalScrollBarEnabled() { return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; } /** *

Define whether the vertical scrollbar should be drawn or not. The * scrollbar is not drawn by default.

* * @param verticalScrollBarEnabled true if the vertical scrollbar should * be painted * * @see #isVerticalScrollBarEnabled() */ public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { mViewFlags ^= SCROLLBARS_VERTICAL; computeOpaqueFlags(); resolvePadding(); } } /** * @hide */ protected void recomputePadding() { internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); } /** * Define whether scrollbars will fade when the view is not scrolling. * * @param fadeScrollbars wheter to enable fading * * @attr ref android.R.styleable#View_fadeScrollbars */ public void setScrollbarFadingEnabled(boolean fadeScrollbars) { initScrollCache(); final ScrollabilityCache scrollabilityCache = mScrollCache; scrollabilityCache.fadeScrollBars = fadeScrollbars; if (fadeScrollbars) { scrollabilityCache.state = ScrollabilityCache.OFF; } else { scrollabilityCache.state = ScrollabilityCache.ON; } } /** * * Returns true if scrollbars will fade when this view is not scrolling * * @return true if scrollbar fading is enabled * * @attr ref android.R.styleable#View_fadeScrollbars */ public boolean isScrollbarFadingEnabled() { return mScrollCache != null && mScrollCache.fadeScrollBars; } /** * * Returns the delay before scrollbars fade. * * @return the delay before scrollbars fade * * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade */ public int getScrollBarDefaultDelayBeforeFade() { return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : mScrollCache.scrollBarDefaultDelayBeforeFade; } /** * Define the delay before scrollbars fade. * * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade * * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade */ public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; } /** * * Returns the scrollbar fade duration. * * @return the scrollbar fade duration * * @attr ref android.R.styleable#View_scrollbarFadeDuration */ public int getScrollBarFadeDuration() { return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : mScrollCache.scrollBarFadeDuration; } /** * Define the scrollbar fade duration. * * @param scrollBarFadeDuration - the scrollbar fade duration * * @attr ref android.R.styleable#View_scrollbarFadeDuration */ public void setScrollBarFadeDuration(int scrollBarFadeDuration) { getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; } /** * * Returns the scrollbar size. * * @return the scrollbar size * * @attr ref android.R.styleable#View_scrollbarSize */ public int getScrollBarSize() { return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : mScrollCache.scrollBarSize; } /** * Define the scrollbar size. * * @param scrollBarSize - the scrollbar size * * @attr ref android.R.styleable#View_scrollbarSize */ public void setScrollBarSize(int scrollBarSize) { getScrollCache().scrollBarSize = scrollBarSize; } /** *

Specify the style of the scrollbars. The scrollbars can be overlaid or * inset. When inset, they add to the padding of the view. And the scrollbars * can be drawn inside the padding area or on the edge of the view. For example, * if a view has a background drawable and you want to draw the scrollbars * inside the padding specified by the drawable, you can use * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to * appear at the edge of the view, ignoring the padding, then you can use * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.

* @param style the style of the scrollbars. Should be one of * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. * @see #SCROLLBARS_INSIDE_OVERLAY * @see #SCROLLBARS_INSIDE_INSET * @see #SCROLLBARS_OUTSIDE_OVERLAY * @see #SCROLLBARS_OUTSIDE_INSET * * @attr ref android.R.styleable#View_scrollbarStyle */ public void setScrollBarStyle(int style) { if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); computeOpaqueFlags(); resolvePadding(); } } /** *

Returns the current scrollbar style.

* @return the current scrollbar style * @see #SCROLLBARS_INSIDE_OVERLAY * @see #SCROLLBARS_INSIDE_INSET * @see #SCROLLBARS_OUTSIDE_OVERLAY * @see #SCROLLBARS_OUTSIDE_INSET * * @attr ref android.R.styleable#View_scrollbarStyle */ @ViewDebug.ExportedProperty(mapping = { @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") }) public int getScrollBarStyle() { return mViewFlags & SCROLLBARS_STYLE_MASK; } /** *

Compute the horizontal range that the horizontal scrollbar * represents.

* *

The range is expressed in arbitrary units that must be the same as the * units used by {@link #computeHorizontalScrollExtent()} and * {@link #computeHorizontalScrollOffset()}.

* *

The default range is the drawing width of this view.

* * @return the total horizontal range represented by the horizontal * scrollbar * * @see #computeHorizontalScrollExtent() * @see #computeHorizontalScrollOffset() * @see android.widget.ScrollBarDrawable */ protected int computeHorizontalScrollRange() { return getWidth(); } /** *

Compute the horizontal offset of the horizontal scrollbar's thumb * within the horizontal range. This value is used to compute the position * of the thumb within the scrollbar's track.

* *

The range is expressed in arbitrary units that must be the same as the * units used by {@link #computeHorizontalScrollRange()} and * {@link #computeHorizontalScrollExtent()}.

* *

The default offset is the scroll offset of this view.

* * @return the horizontal offset of the scrollbar's thumb * * @see #computeHorizontalScrollRange() * @see #computeHorizontalScrollExtent() * @see android.widget.ScrollBarDrawable */ protected int computeHorizontalScrollOffset() { return mScrollX; } /** *

Compute the horizontal extent of the horizontal scrollbar's thumb * within the horizontal range. This value is used to compute the length * of the thumb within the scrollbar's track.

* *

The range is expressed in arbitrary units that must be the same as the * units used by {@link #computeHorizontalScrollRange()} and * {@link #computeHorizontalScrollOffset()}.

* *

The default extent is the drawing width of this view.

* * @return the horizontal extent of the scrollbar's thumb * * @see #computeHorizontalScrollRange() * @see #computeHorizontalScrollOffset() * @see android.widget.ScrollBarDrawable */ protected int computeHorizontalScrollExtent() { return getWidth(); } /** *

Compute the vertical range that the vertical scrollbar represents.

* *

The range is expressed in arbitrary units that must be the same as the * units used by {@link #computeVerticalScrollExtent()} and * {@link #computeVerticalScrollOffset()}.

* * @return the total vertical range represented by the vertical scrollbar * *

The default range is the drawing height of this view.

* * @see #computeVerticalScrollExtent() * @see #computeVerticalScrollOffset() * @see android.widget.ScrollBarDrawable */ protected int computeVerticalScrollRange() { return getHeight(); } /** *

Compute the vertical offset of the vertical scrollbar's thumb * within the horizontal range. This value is used to compute the position * of the thumb within the scrollbar's track.

* *

The range is expressed in arbitrary units that must be the same as the * units used by {@link #computeVerticalScrollRange()} and * {@link #computeVerticalScrollExtent()}.

* *

The default offset is the scroll offset of this view.

* * @return the vertical offset of the scrollbar's thumb * * @see #computeVerticalScrollRange() * @see #computeVerticalScrollExtent() * @see android.widget.ScrollBarDrawable */ protected int computeVerticalScrollOffset() { return mScrollY; } /** *

Compute the vertical extent of the horizontal scrollbar's thumb * within the vertical range. This value is used to compute the length * of the thumb within the scrollbar's track.

* *

The range is expressed in arbitrary units that must be the same as the * units used by {@link #computeVerticalScrollRange()} and * {@link #computeVerticalScrollOffset()}.

* *

The default extent is the drawing height of this view.

* * @return the vertical extent of the scrollbar's thumb * * @see #computeVerticalScrollRange() * @see #computeVerticalScrollOffset() * @see android.widget.ScrollBarDrawable */ protected int computeVerticalScrollExtent() { return getHeight(); } /** * Check if this view can be scrolled horizontally in a certain direction. * * @param direction Negative to check scrolling left, positive to check scrolling right. * @return true if this view can be scrolled in the specified direction, false otherwise. */ public boolean canScrollHorizontally(int direction) { final int offset = computeHorizontalScrollOffset(); final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); if (range == 0) return false; if (direction < 0) { return offset > 0; } else { return offset < range - 1; } } /** * Check if this view can be scrolled vertically in a certain direction. * * @param direction Negative to check scrolling up, positive to check scrolling down. * @return true if this view can be scrolled in the specified direction, false otherwise. */ public boolean canScrollVertically(int direction) { final int offset = computeVerticalScrollOffset(); final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); if (range == 0) return false; if (direction < 0) { return offset > 0; } else { return offset < range - 1; } } /** *

Request the drawing of the horizontal and the vertical scrollbar. The * scrollbars are painted only if they have been awakened first.

* * @param canvas the canvas on which to draw the scrollbars * * @see #awakenScrollBars(int) */ protected final void onDrawScrollBars(Canvas canvas) { // scrollbars are drawn only when the animation is running final ScrollabilityCache cache = mScrollCache; if (cache != null) { int state = cache.state; if (state == ScrollabilityCache.OFF) { return; } boolean invalidate = false; if (state == ScrollabilityCache.FADING) { // We're fading -- get our fade interpolation if (cache.interpolatorValues == null) { cache.interpolatorValues = new float[1]; } float[] values = cache.interpolatorValues; // Stops the animation if we're done if (cache.scrollBarInterpolator.timeToValues(values) == Interpolator.Result.FREEZE_END) { cache.state = ScrollabilityCache.OFF; } else { cache.scrollBar.setAlpha(Math.round(values[0])); } // This will make the scroll bars inval themselves after // drawing. We only want this when we're fading so that // we prevent excessive redraws invalidate = true; } else { // We're just on -- but we may have been fading before so // reset alpha cache.scrollBar.setAlpha(255); } final int viewFlags = mViewFlags; final boolean drawHorizontalScrollBar = (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; final boolean drawVerticalScrollBar = (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL && !isVerticalScrollBarHidden(); if (drawVerticalScrollBar || drawHorizontalScrollBar) { final int width = mRight - mLeft; final int height = mBottom - mTop; final ScrollBarDrawable scrollBar = cache.scrollBar; final int scrollX = mScrollX; final int scrollY = mScrollY; final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; int left; int top; int right; int bottom; if (drawHorizontalScrollBar) { int size = scrollBar.getSize(false); if (size <= 0) { size = cache.scrollBarSize; } scrollBar.setParameters(computeHorizontalScrollRange(), computeHorizontalScrollOffset(), computeHorizontalScrollExtent(), false); final int verticalScrollBarGap = drawVerticalScrollBar ? getVerticalScrollbarWidth() : 0; top = scrollY + height - size - (mUserPaddingBottom & inside); left = scrollX + (mPaddingLeft & inside); right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; bottom = top + size; onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); if (invalidate) { invalidate(left, top, right, bottom); } } if (drawVerticalScrollBar) { int size = scrollBar.getSize(true); if (size <= 0) { size = cache.scrollBarSize; } scrollBar.setParameters(computeVerticalScrollRange(), computeVerticalScrollOffset(), computeVerticalScrollExtent(), true); int verticalScrollbarPosition = mVerticalScrollbarPosition; if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { verticalScrollbarPosition = isLayoutRtl() ? SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; } switch (verticalScrollbarPosition) { default: case SCROLLBAR_POSITION_RIGHT: left = scrollX + width - size - (mUserPaddingRight & inside); break; case SCROLLBAR_POSITION_LEFT: left = scrollX + (mUserPaddingLeft & inside); break; } top = scrollY + (mPaddingTop & inside); right = left + size; bottom = scrollY + height - (mUserPaddingBottom & inside); onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); if (invalidate) { invalidate(left, top, right, bottom); } } } } } /** * Override this if the vertical scrollbar needs to be hidden in a subclass, like when * FastScroller is visible. * @return whether to temporarily hide the vertical scrollbar * @hide */ protected boolean isVerticalScrollBarHidden() { return false; } /** *

Draw the horizontal scrollbar if * {@link #isHorizontalScrollBarEnabled()} returns true.

* * @param canvas the canvas on which to draw the scrollbar * @param scrollBar the scrollbar's drawable * * @see #isHorizontalScrollBarEnabled() * @see #computeHorizontalScrollRange() * @see #computeHorizontalScrollExtent() * @see #computeHorizontalScrollOffset() * @see android.widget.ScrollBarDrawable * @hide */ protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, int l, int t, int r, int b) { scrollBar.setBounds(l, t, r, b); scrollBar.draw(canvas); } /** *

Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} * returns true.

* * @param canvas the canvas on which to draw the scrollbar * @param scrollBar the scrollbar's drawable * * @see #isVerticalScrollBarEnabled() * @see #computeVerticalScrollRange() * @see #computeVerticalScrollExtent() * @see #computeVerticalScrollOffset() * @see android.widget.ScrollBarDrawable * @hide */ protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, int l, int t, int r, int b) { scrollBar.setBounds(l, t, r, b); scrollBar.draw(canvas); } /** * Implement this to do your drawing. * * @param canvas the canvas on which the background will be drawn */ protected void onDraw(Canvas canvas) { } /* * Caller is responsible for calling requestLayout if necessary. * (This allows addViewInLayout to not request a new layout.) */ void assignParent(ViewParent parent) { if (mParent == null) { mParent = parent; } else if (parent == null) { mParent = null; } else { throw new RuntimeException("view " + this + " being added, but" + " it already has a parent"); } } /** * This is called when the view is attached to a window. At this point it * has a Surface and will start drawing. Note that this function is * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, * however it may be called any time before the first onDraw -- including * before or after {@link #onMeasure(int, int)}. * * @see #onDetachedFromWindow() */ protected void onAttachedToWindow() { if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { mParent.requestTransparentRegion(this); } if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { initialAwakenScrollBars(); mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; } mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; jumpDrawablesToCurrentState(); resetSubtreeAccessibilityStateChanged(); if (isFocused()) { InputMethodManager imm = InputMethodManager.peekInstance(); imm.focusIn(this); } if (mDisplayList != null) { mDisplayList.clearDirty(); } } /** * Resolve all RTL related properties. * * @return true if resolution of RTL properties has been done * * @hide */ public boolean resolveRtlPropertiesIfNeeded() { if (!needRtlPropertiesResolution()) return false; // Order is important here: LayoutDirection MUST be resolved first if (!isLayoutDirectionResolved()) { resolveLayoutDirection(); resolveLayoutParams(); } // ... then we can resolve the others properties depending on the resolved LayoutDirection. if (!isTextDirectionResolved()) { resolveTextDirection(); } if (!isTextAlignmentResolved()) { resolveTextAlignment(); } // Should resolve Drawables before Padding because we need the layout direction of the // Drawable to correctly resolve Padding. if (!isDrawablesResolved()) { resolveDrawables(); } if (!isPaddingResolved()) { resolvePadding(); } onRtlPropertiesChanged(getLayoutDirection()); return true; } /** * Reset resolution of all RTL related properties. * * @hide */ public void resetRtlProperties() { resetResolvedLayoutDirection(); resetResolvedTextDirection(); resetResolvedTextAlignment(); resetResolvedPadding(); resetResolvedDrawables(); } /** * @see #onScreenStateChanged(int) */ void dispatchScreenStateChanged(int screenState) { onScreenStateChanged(screenState); } /** * This method is called whenever the state of the screen this view is * attached to changes. A state change will usually occurs when the screen * turns on or off (whether it happens automatically or the user does it * manually.) * * @param screenState The new state of the screen. Can be either * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} */ public void onScreenStateChanged(int screenState) { } /** * Return true if the application tag in the AndroidManifest has set "supportRtl" to true */ private boolean hasRtlSupport() { return mContext.getApplicationInfo().hasRtlSupport(); } /** * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or * RTL not supported) */ private boolean isRtlCompatibilityMode() { final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); } /** * @return true if RTL properties need resolution. * */ private boolean needRtlPropertiesResolution() { return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; } /** * Called when any RTL property (layout direction or text direction or text alignment) has * been changed. * * Subclasses need to override this method to take care of cached information that depends on the * resolved layout direction, or to inform child views that inherit their layout direction. * * The default implementation does nothing. * * @param layoutDirection the direction of the layout * * @see #LAYOUT_DIRECTION_LTR * @see #LAYOUT_DIRECTION_RTL */ public void onRtlPropertiesChanged(int layoutDirection) { } /** * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing * that the parent directionality can and will be resolved before its children. * * @return true if resolution has been done, false otherwise. * * @hide */ public boolean resolveLayoutDirection() { // Clear any previous layout direction resolution mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; if (hasRtlSupport()) { // Set resolved depending on layout direction switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { case LAYOUT_DIRECTION_INHERIT: // We cannot resolve yet. LTR is by default and let the resolution happen again // later to get the correct resolved value if (!canResolveLayoutDirection()) return false; // Parent has not yet resolved, LTR is still the default try { if (!mParent.isLayoutDirectionResolved()) return false; if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; } } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); } break; case LAYOUT_DIRECTION_RTL: mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; break; case LAYOUT_DIRECTION_LOCALE: if((LAYOUT_DIRECTION_RTL == TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; } break; default: // Nothing to do, LTR by default } } // Set to resolved mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; return true; } /** * Check if layout direction resolution can be done. * * @return true if layout direction resolution can be done otherwise return false. */ public boolean canResolveLayoutDirection() { switch (getRawLayoutDirection()) { case LAYOUT_DIRECTION_INHERIT: if (mParent != null) { try { return mParent.canResolveLayoutDirection(); } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); } } return false; default: return true; } } /** * Reset the resolved layout direction. Layout direction will be resolved during a call to * {@link #onMeasure(int, int)}. * * @hide */ public void resetResolvedLayoutDirection() { // Reset the current resolved bits mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; } /** * @return true if the layout direction is inherited. * * @hide */ public boolean isLayoutDirectionInherited() { return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); } /** * @return true if layout direction has been resolved. */ public boolean isLayoutDirectionResolved() { return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; } /** * Return if padding has been resolved * * @hide */ boolean isPaddingResolved() { return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; } /** * Resolves padding depending on layout direction, if applicable, and * recomputes internal padding values to adjust for scroll bars. * * @hide */ public void resolvePadding() { final int resolvedLayoutDirection = getLayoutDirection(); if (!isRtlCompatibilityMode()) { // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. // If start / end padding are defined, they will be resolved (hence overriding) to // left / right or right / left depending on the resolved layout direction. // If start / end padding are not defined, use the left / right ones. if (mBackground != null && (!mLeftPaddingDefined || !mRightPaddingDefined)) { Rect padding = sThreadLocal.get(); if (padding == null) { padding = new Rect(); sThreadLocal.set(padding); } mBackground.getPadding(padding); if (!mLeftPaddingDefined) { mUserPaddingLeftInitial = padding.left; } if (!mRightPaddingDefined) { mUserPaddingRightInitial = padding.right; } } switch (resolvedLayoutDirection) { case LAYOUT_DIRECTION_RTL: if (mUserPaddingStart != UNDEFINED_PADDING) { mUserPaddingRight = mUserPaddingStart; } else { mUserPaddingRight = mUserPaddingRightInitial; } if (mUserPaddingEnd != UNDEFINED_PADDING) { mUserPaddingLeft = mUserPaddingEnd; } else { mUserPaddingLeft = mUserPaddingLeftInitial; } break; case LAYOUT_DIRECTION_LTR: default: if (mUserPaddingStart != UNDEFINED_PADDING) { mUserPaddingLeft = mUserPaddingStart; } else { mUserPaddingLeft = mUserPaddingLeftInitial; } if (mUserPaddingEnd != UNDEFINED_PADDING) { mUserPaddingRight = mUserPaddingEnd; } else { mUserPaddingRight = mUserPaddingRightInitial; } } mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; } internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); onRtlPropertiesChanged(resolvedLayoutDirection); mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; } /** * Reset the resolved layout direction. * * @hide */ public void resetResolvedPadding() { mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; } /** * This is called when the view is detached from a window. At this point it * no longer has a surface for drawing. * * @see #onAttachedToWindow() */ protected void onDetachedFromWindow() { mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; removeUnsetPressCallback(); removeLongPressCallback(); removePerformClickCallback(); removeSendViewScrolledAccessibilityEventCallback(); destroyDrawingCache(); destroyLayer(false); cleanupDraw(); mCurrentAnimation = null; } private void cleanupDraw() { if (mAttachInfo != null) { if (mDisplayList != null) { mDisplayList.markDirty(); mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); } mAttachInfo.mViewRootImpl.cancelInvalidate(this); } else { // Should never happen resetDisplayList(); } } /** * This method ensures the hardware renderer is in a valid state * before executing the specified action. * * This method will attempt to set a valid state even if the window * the renderer is attached to was destroyed. * * This method is not guaranteed to work. If the hardware renderer * does not exist or cannot be put in a valid state, this method * will not executed the specified action. * * The specified action is executed synchronously. * * @param action The action to execute after the renderer is in a valid state * * @return True if the specified Runnable was executed, false otherwise * * @hide */ public boolean executeHardwareAction(Runnable action) { //noinspection SimplifiableIfStatement if (mAttachInfo != null && mAttachInfo.mHardwareRenderer != null) { return mAttachInfo.mHardwareRenderer.safelyRun(action); } return false; } void invalidateInheritedLayoutMode(int layoutModeOfRoot) { } /** * @return The number of times this view has been attached to a window */ protected int getWindowAttachCount() { return mWindowAttachCount; } /** * Retrieve a unique token identifying the window this view is attached to. * @return Return the window's token for use in * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. */ public IBinder getWindowToken() { return mAttachInfo != null ? mAttachInfo.mWindowToken : null; } /** * Retrieve the {@link WindowId} for the window this view is * currently attached to. */ public WindowId getWindowId() { if (mAttachInfo == null) { return null; } if (mAttachInfo.mWindowId == null) { try { mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( mAttachInfo.mWindowToken); mAttachInfo.mWindowId = new WindowId( mAttachInfo.mIWindowId); } catch (RemoteException e) { } } return mAttachInfo.mWindowId; } /** * Retrieve a unique token identifying the top-level "real" window of * the window that this view is attached to. That is, this is like * {@link #getWindowToken}, except if the window this view in is a panel * window (attached to another containing window), then the token of * the containing window is returned instead. * * @return Returns the associated window token, either * {@link #getWindowToken()} or the containing window's token. */ public IBinder getApplicationWindowToken() { AttachInfo ai = mAttachInfo; if (ai != null) { IBinder appWindowToken = ai.mPanelParentWindowToken; if (appWindowToken == null) { appWindowToken = ai.mWindowToken; } return appWindowToken; } return null; } /** * Gets the logical display to which the view's window has been attached. * * @return The logical display, or null if the view is not currently attached to a window. */ public Display getDisplay() { return mAttachInfo != null ? mAttachInfo.mDisplay : null; } /** * Retrieve private session object this view hierarchy is using to * communicate with the window manager. * @return the session object to communicate with the window manager */ /*package*/ IWindowSession getWindowSession() { return mAttachInfo != null ? mAttachInfo.mSession : null; } /** * @param info the {@link android.view.View.AttachInfo} to associated with * this view */ void dispatchAttachedToWindow(AttachInfo info, int visibility) { //System.out.println("Attached! " + this); mAttachInfo = info; if (mOverlay != null) { mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); } mWindowAttachCount++; // We will need to evaluate the drawable state at least once. mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; if (mFloatingTreeObserver != null) { info.mTreeObserver.merge(mFloatingTreeObserver); mFloatingTreeObserver = null; } if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { mAttachInfo.mScrollContainers.add(this); mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; } performCollectViewAttributes(mAttachInfo, visibility); onAttachedToWindow(); ListenerInfo li = mListenerInfo; final CopyOnWriteArrayList listeners = li != null ? li.mOnAttachStateChangeListeners : null; if (listeners != null && listeners.size() > 0) { // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to // perform the dispatching. The iterator is a safe guard against listeners that // could mutate the list by calling the various add/remove methods. This prevents // the array from being modified while we iterate it. for (OnAttachStateChangeListener listener : listeners) { listener.onViewAttachedToWindow(this); } } int vis = info.mWindowVisibility; if (vis != GONE) { onWindowVisibilityChanged(vis); } if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { // If nobody has evaluated the drawable state yet, then do it now. refreshDrawableState(); } needGlobalAttributesUpdate(false); } void dispatchDetachedFromWindow() { AttachInfo info = mAttachInfo; if (info != null) { int vis = info.mWindowVisibility; if (vis != GONE) { onWindowVisibilityChanged(GONE); } } onDetachedFromWindow(); ListenerInfo li = mListenerInfo; final CopyOnWriteArrayList listeners = li != null ? li.mOnAttachStateChangeListeners : null; if (listeners != null && listeners.size() > 0) { // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to // perform the dispatching. The iterator is a safe guard against listeners that // could mutate the list by calling the various add/remove methods. This prevents // the array from being modified while we iterate it. for (OnAttachStateChangeListener listener : listeners) { listener.onViewDetachedFromWindow(this); } } if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { mAttachInfo.mScrollContainers.remove(this); mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; } mAttachInfo = null; if (mOverlay != null) { mOverlay.getOverlayView().dispatchDetachedFromWindow(); } } /** * Cancel any deferred high-level input events that were previously posted to the event queue. * *

Many views post high-level events such as click handlers to the event queue * to run deferred in order to preserve a desired user experience - clearing visible * pressed states before executing, etc. This method will abort any events of this nature * that are currently in flight.

* *

Custom views that generate their own high-level deferred input events should override * {@link #onCancelPendingInputEvents()} and remove those pending events from the queue.

* *

This will also cancel pending input events for any child views.

* *

Note that this may not be sufficient as a debouncing strategy for clicks in all cases. * This will not impact newer events posted after this call that may occur as a result of * lower-level input events still waiting in the queue. If you are trying to prevent * double-submitted events for the duration of some sort of asynchronous transaction * you should also take other steps to protect against unexpected double inputs e.g. calling * {@link #setEnabled(boolean) setEnabled(false)} and re-enabling the view when * the transaction completes, tracking already submitted transaction IDs, etc.

*/ public final void cancelPendingInputEvents() { dispatchCancelPendingInputEvents(); } /** * Called by {@link #cancelPendingInputEvents()} to cancel input events in flight. * Overridden by ViewGroup to dispatch. Package scoped to prevent app-side meddling. */ void dispatchCancelPendingInputEvents() { mPrivateFlags3 &= ~PFLAG3_CALLED_SUPER; onCancelPendingInputEvents(); if ((mPrivateFlags3 & PFLAG3_CALLED_SUPER) != PFLAG3_CALLED_SUPER) { throw new SuperNotCalledException("View " + getClass().getSimpleName() + " did not call through to super.onCancelPendingInputEvents()"); } } /** * Called as the result of a call to {@link #cancelPendingInputEvents()} on this view or * a parent view. * *

This method is responsible for removing any pending high-level input events that were * posted to the event queue to run later. Custom view classes that post their own deferred * high-level events via {@link #post(Runnable)}, {@link #postDelayed(Runnable, long)} or * {@link android.os.Handler} should override this method, call * super.onCancelPendingInputEvents() and remove those callbacks as appropriate. *

*/ public void onCancelPendingInputEvents() { removePerformClickCallback(); cancelLongPress(); mPrivateFlags3 |= PFLAG3_CALLED_SUPER; } /** * Store this view hierarchy's frozen state into the given container. * * @param container The SparseArray in which to save the view's state. * * @see #restoreHierarchyState(android.util.SparseArray) * @see #dispatchSaveInstanceState(android.util.SparseArray) * @see #onSaveInstanceState() */ public void saveHierarchyState(SparseArray container) { dispatchSaveInstanceState(container); } /** * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for * this view and its children. May be overridden to modify how freezing happens to a * view's children; for example, some views may want to not store state for their children. * * @param container The SparseArray in which to save the view's state. * * @see #dispatchRestoreInstanceState(android.util.SparseArray) * @see #saveHierarchyState(android.util.SparseArray) * @see #onSaveInstanceState() */ protected void dispatchSaveInstanceState(SparseArray container) { if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; Parcelable state = onSaveInstanceState(); if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { throw new IllegalStateException( "Derived class did not call super.onSaveInstanceState()"); } if (state != null) { // Log.i("View", "Freezing #" + Integer.toHexString(mID) // + ": " + state); container.put(mID, state); } } } /** * Hook allowing a view to generate a representation of its internal state * that can later be used to create a new instance with that same state. * This state should only contain information that is not persistent or can * not be reconstructed later. For example, you will never store your * current position on screen because that will be computed again when a * new instance of the view is placed in its view hierarchy. *

* Some examples of things you may store here: the current cursor position * in a text view (but usually not the text itself since that is stored in a * content provider or other persistent storage), the currently selected * item in a list view. * * @return Returns a Parcelable object containing the view's current dynamic * state, or null if there is nothing interesting to save. The * default implementation returns null. * @see #onRestoreInstanceState(android.os.Parcelable) * @see #saveHierarchyState(android.util.SparseArray) * @see #dispatchSaveInstanceState(android.util.SparseArray) * @see #setSaveEnabled(boolean) */ protected Parcelable onSaveInstanceState() { mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; return BaseSavedState.EMPTY_STATE; } /** * Restore this view hierarchy's frozen state from the given container. * * @param container The SparseArray which holds previously frozen states. * * @see #saveHierarchyState(android.util.SparseArray) * @see #dispatchRestoreInstanceState(android.util.SparseArray) * @see #onRestoreInstanceState(android.os.Parcelable) */ public void restoreHierarchyState(SparseArray container) { dispatchRestoreInstanceState(container); } /** * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the * state for this view and its children. May be overridden to modify how restoring * happens to a view's children; for example, some views may want to not store state * for their children. * * @param container The SparseArray which holds previously saved state. * * @see #dispatchSaveInstanceState(android.util.SparseArray) * @see #restoreHierarchyState(android.util.SparseArray) * @see #onRestoreInstanceState(android.os.Parcelable) */ protected void dispatchRestoreInstanceState(SparseArray container) { if (mID != NO_ID) { Parcelable state = container.get(mID); if (state != null) { // Log.i("View", "Restoreing #" + Integer.toHexString(mID) // + ": " + state); mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; onRestoreInstanceState(state); if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { throw new IllegalStateException( "Derived class did not call super.onRestoreInstanceState()"); } } } } /** * Hook allowing a view to re-apply a representation of its internal state that had previously * been generated by {@link #onSaveInstanceState}. This function will never be called with a * null state. * * @param state The frozen state that had previously been returned by * {@link #onSaveInstanceState}. * * @see #onSaveInstanceState() * @see #restoreHierarchyState(android.util.SparseArray) * @see #dispatchRestoreInstanceState(android.util.SparseArray) */ protected void onRestoreInstanceState(Parcelable state) { mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; if (state != BaseSavedState.EMPTY_STATE && state != null) { throw new IllegalArgumentException("Wrong state class, expecting View State but " + "received " + state.getClass().toString() + " instead. This usually happens " + "when two views of different type have the same id in the same hierarchy. " + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " + "other views do not use the same id."); } } /** *

Return the time at which the drawing of the view hierarchy started.

* * @return the drawing start time in milliseconds */ public long getDrawingTime() { return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; } /** *

Enables or disables the duplication of the parent's state into this view. When * duplication is enabled, this view gets its drawable state from its parent rather * than from its own internal properties.

* *

Note: in the current implementation, setting this property to true after the * view was added to a ViewGroup might have no effect at all. This property should * always be used from XML or set to true before adding this view to a ViewGroup.

* *

Note: if this view's parent addStateFromChildren property is enabled and this * property is enabled, an exception will be thrown.

* *

Note: if the child view uses and updates additionnal states which are unknown to the * parent, these states should not be affected by this method.

* * @param enabled True to enable duplication of the parent's drawable state, false * to disable it. * * @see #getDrawableState() * @see #isDuplicateParentStateEnabled() */ public void setDuplicateParentStateEnabled(boolean enabled) { setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); } /** *

Indicates whether this duplicates its drawable state from its parent.

* * @return True if this view's drawable state is duplicated from the parent, * false otherwise * * @see #getDrawableState() * @see #setDuplicateParentStateEnabled(boolean) */ public boolean isDuplicateParentStateEnabled() { return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; } /** *

Specifies the type of layer backing this view. The layer can be * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or * {@link #LAYER_TYPE_HARDWARE}.

* *

A layer is associated with an optional {@link android.graphics.Paint} * instance that controls how the layer is composed on screen. The following * properties of the paint are taken into account when composing the layer:

*
    *
  • {@link android.graphics.Paint#getAlpha() Translucency (alpha)}
  • *
  • {@link android.graphics.Paint#getXfermode() Blending mode}
  • *
  • {@link android.graphics.Paint#getColorFilter() Color filter}
  • *
* *

If this view has an alpha value set to < 1.0 by calling * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded * by this view's alpha value.

* *

Refer to the documentation of {@link #LAYER_TYPE_NONE}, * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} * for more information on when and how to use layers.

* * @param layerType The type of layer to use with this view, must be one of * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or * {@link #LAYER_TYPE_HARDWARE} * @param paint The paint used to compose the layer. This argument is optional * and can be null. It is ignored when the layer type is * {@link #LAYER_TYPE_NONE} * * @see #getLayerType() * @see #LAYER_TYPE_NONE * @see #LAYER_TYPE_SOFTWARE * @see #LAYER_TYPE_HARDWARE * @see #setAlpha(float) * * @attr ref android.R.styleable#View_layerType */ public void setLayerType(int layerType, Paint paint) { if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); } if (layerType == mLayerType) { if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { mLayerPaint = paint == null ? new Paint() : paint; invalidateParentCaches(); invalidate(true); } return; } // Destroy any previous software drawing cache if needed switch (mLayerType) { case LAYER_TYPE_HARDWARE: destroyLayer(false); // fall through - non-accelerated views may use software layer mechanism instead case LAYER_TYPE_SOFTWARE: destroyDrawingCache(); break; default: break; } mLayerType = layerType; final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); mLocalDirtyRect = layerDisabled ? null : new Rect(); invalidateParentCaches(); invalidate(true); } /** * Updates the {@link Paint} object used with the current layer (used only if the current * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to * ensure that the view gets redrawn immediately. * *

A layer is associated with an optional {@link android.graphics.Paint} * instance that controls how the layer is composed on screen. The following * properties of the paint are taken into account when composing the layer:

*
    *
  • {@link android.graphics.Paint#getAlpha() Translucency (alpha)}
  • *
  • {@link android.graphics.Paint#getXfermode() Blending mode}
  • *
  • {@link android.graphics.Paint#getColorFilter() Color filter}
  • *
* *

If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the * alpha value of the layer's paint is superceded by this view's alpha value.

* * @param paint The paint used to compose the layer. This argument is optional * and can be null. It is ignored when the layer type is * {@link #LAYER_TYPE_NONE} * * @see #setLayerType(int, android.graphics.Paint) */ public void setLayerPaint(Paint paint) { int layerType = getLayerType(); if (layerType != LAYER_TYPE_NONE) { mLayerPaint = paint == null ? new Paint() : paint; if (layerType == LAYER_TYPE_HARDWARE) { HardwareLayer layer = getHardwareLayer(); if (layer != null) { layer.setLayerPaint(paint); } invalidateViewProperty(false, false); } else { invalidate(); } } } /** * Indicates whether this view has a static layer. A view with layer type * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are * dynamic. */ boolean hasStaticLayer() { return true; } /** * Indicates what type of layer is currently associated with this view. By default * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} * for more information on the different types of layers. * * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or * {@link #LAYER_TYPE_HARDWARE} * * @see #setLayerType(int, android.graphics.Paint) * @see #buildLayer() * @see #LAYER_TYPE_NONE * @see #LAYER_TYPE_SOFTWARE * @see #LAYER_TYPE_HARDWARE */ public int getLayerType() { return mLayerType; } /** * Forces this view's layer to be created and this view to be rendered * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, * invoking this method will have no effect. * * This method can for instance be used to render a view into its layer before * starting an animation. If this view is complex, rendering into the layer * before starting the animation will avoid skipping frames. * * @throws IllegalStateException If this view is not attached to a window * * @see #setLayerType(int, android.graphics.Paint) */ public void buildLayer() { if (mLayerType == LAYER_TYPE_NONE) return; final AttachInfo attachInfo = mAttachInfo; if (attachInfo == null) { throw new IllegalStateException("This view must be attached to a window first"); } switch (mLayerType) { case LAYER_TYPE_HARDWARE: if (attachInfo.mHardwareRenderer != null && attachInfo.mHardwareRenderer.isEnabled() && attachInfo.mHardwareRenderer.validate()) { getHardwareLayer(); // TODO: We need a better way to handle this case // If views have registered pre-draw listeners they need // to be notified before we build the layer. Those listeners // may however rely on other events to happen first so we // cannot just invoke them here until they don't cancel the // current frame if (!attachInfo.mTreeObserver.hasOnPreDrawListeners()) { attachInfo.mViewRootImpl.dispatchFlushHardwareLayerUpdates(); } } break; case LAYER_TYPE_SOFTWARE: buildDrawingCache(true); break; } } /** *

Returns a hardware layer that can be used to draw this view again * without executing its draw method.

* * @return A HardwareLayer ready to render, or null if an error occurred. */ HardwareLayer getHardwareLayer() { if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || !mAttachInfo.mHardwareRenderer.isEnabled()) { return null; } if (!mAttachInfo.mHardwareRenderer.validate()) return null; final int width = mRight - mLeft; final int height = mBottom - mTop; if (width == 0 || height == 0) { return null; } if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { if (mHardwareLayer == null) { mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( width, height, isOpaque()); mLocalDirtyRect.set(0, 0, width, height); } else { if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { if (mHardwareLayer.resize(width, height)) { mLocalDirtyRect.set(0, 0, width, height); } } // This should not be necessary but applications that change // the parameters of their background drawable without calling // this.setBackground(Drawable) can leave the view in a bad state // (for instance isOpaque() returns true, but the background is // not opaque.) computeOpaqueFlags(); final boolean opaque = isOpaque(); if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { mHardwareLayer.setOpaque(opaque); mLocalDirtyRect.set(0, 0, width, height); } } // The layer is not valid if the underlying GPU resources cannot be allocated if (!mHardwareLayer.isValid()) { return null; } mHardwareLayer.setLayerPaint(mLayerPaint); mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); ViewRootImpl viewRoot = getViewRootImpl(); if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); mLocalDirtyRect.setEmpty(); } return mHardwareLayer; } /** * Destroys this View's hardware layer if possible. * * @return True if the layer was destroyed, false otherwise. * * @see #setLayerType(int, android.graphics.Paint) * @see #LAYER_TYPE_HARDWARE */ boolean destroyLayer(boolean valid) { if (mHardwareLayer != null) { AttachInfo info = mAttachInfo; if (info != null && info.mHardwareRenderer != null && info.mHardwareRenderer.isEnabled() && (valid || info.mHardwareRenderer.validate())) { info.mHardwareRenderer.cancelLayerUpdate(mHardwareLayer); mHardwareLayer.destroy(); mHardwareLayer = null; invalidate(true); invalidateParentCaches(); } return true; } return false; } /** * Destroys all hardware rendering resources. This method is invoked * when the system needs to reclaim resources. Upon execution of this * method, you should free any OpenGL resources created by the view. * * Note: you must call * super.destroyHardwareResources() when overriding * this method. * * @hide */ protected void destroyHardwareResources() { resetDisplayList(); destroyLayer(true); } /** *

Enables or disables the drawing cache. When the drawing cache is enabled, the next call * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when * the cache is enabled. To benefit from the cache, you must request the drawing cache by * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not * null.

* *

Enabling the drawing cache is similar to * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware * acceleration is turned off. When hardware acceleration is turned on, enabling the * drawing cache has no effect on rendering because the system uses a different mechanism * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} * for information on how to enable software and hardware layers.

* *

This API can be used to manually generate * a bitmap copy of this view, by setting the flag to true and calling * {@link #getDrawingCache()}.

* * @param enabled true to enable the drawing cache, false otherwise * * @see #isDrawingCacheEnabled() * @see #getDrawingCache() * @see #buildDrawingCache() * @see #setLayerType(int, android.graphics.Paint) */ public void setDrawingCacheEnabled(boolean enabled) { mCachingFailed = false; setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); } /** *

Indicates whether the drawing cache is enabled for this view.

* * @return true if the drawing cache is enabled * * @see #setDrawingCacheEnabled(boolean) * @see #getDrawingCache() */ @ViewDebug.ExportedProperty(category = "drawing") public boolean isDrawingCacheEnabled() { return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; } /** * Debugging utility which recursively outputs the dirty state of a view and its * descendants. * * @hide */ @SuppressWarnings({"UnusedDeclaration"}) public void outputDirtyFlags(String indent, boolean clear, int clearMask) { Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); if (clear) { mPrivateFlags &= clearMask; } if (this instanceof ViewGroup) { ViewGroup parent = (ViewGroup) this; final int count = parent.getChildCount(); for (int i = 0; i < count; i++) { final View child = parent.getChildAt(i); child.outputDirtyFlags(indent + " ", clear, clearMask); } } } /** * This method is used by ViewGroup to cause its children to restore or recreate their * display lists. It is called by getDisplayList() when the parent ViewGroup does not need * to recreate its own display list, which would happen if it went through the normal * draw/dispatchDraw mechanisms. * * @hide */ protected void dispatchGetDisplayList() {} /** * A view that is not attached or hardware accelerated cannot create a display list. * This method checks these conditions and returns the appropriate result. * * @return true if view has the ability to create a display list, false otherwise. * * @hide */ public boolean canHaveDisplayList() { return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); } /** * @return The {@link HardwareRenderer} associated with that view or null if * hardware rendering is not supported or this view is not attached * to a window. * * @hide */ public HardwareRenderer getHardwareRenderer() { if (mAttachInfo != null) { return mAttachInfo.mHardwareRenderer; } return null; } /** * Returns a DisplayList. If the incoming displayList is null, one will be created. * Otherwise, the same display list will be returned (after having been rendered into * along the way, depending on the invalidation state of the view). * * @param displayList The previous version of this displayList, could be null. * @param isLayer Whether the requester of the display list is a layer. If so, * the view will avoid creating a layer inside the resulting display list. * @return A new or reused DisplayList object. */ private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { if (!canHaveDisplayList()) { return null; } if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || displayList == null || !displayList.isValid() || (!isLayer && mRecreateDisplayList))) { // Don't need to recreate the display list, just need to tell our // children to restore/recreate theirs if (displayList != null && displayList.isValid() && !isLayer && !mRecreateDisplayList) { mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; mPrivateFlags &= ~PFLAG_DIRTY_MASK; dispatchGetDisplayList(); return displayList; } if (!isLayer) { // If we got here, we're recreating it. Mark it as such to ensure that // we copy in child display lists into ours in drawChild() mRecreateDisplayList = true; } if (displayList == null) { displayList = mAttachInfo.mHardwareRenderer.createDisplayList(getClass().getName()); // If we're creating a new display list, make sure our parent gets invalidated // since they will need to recreate their display list to account for this // new child display list. invalidateParentCaches(); } boolean caching = false; int width = mRight - mLeft; int height = mBottom - mTop; int layerType = getLayerType(); final HardwareCanvas canvas = displayList.start(width, height); try { if (!isLayer && layerType != LAYER_TYPE_NONE) { if (layerType == LAYER_TYPE_HARDWARE) { final HardwareLayer layer = getHardwareLayer(); if (layer != null && layer.isValid()) { canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); } else { canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); } caching = true; } else { buildDrawingCache(true); Bitmap cache = getDrawingCache(true); if (cache != null) { canvas.drawBitmap(cache, 0, 0, mLayerPaint); caching = true; } } } else { computeScroll(); canvas.translate(-mScrollX, -mScrollY); if (!isLayer) { mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; mPrivateFlags &= ~PFLAG_DIRTY_MASK; } // Fast path for layouts with no backgrounds if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { dispatchDraw(canvas); if (mOverlay != null && !mOverlay.isEmpty()) { mOverlay.getOverlayView().draw(canvas); } } else { draw(canvas); } } } finally { displayList.end(); displayList.setCaching(caching); if (isLayer) { displayList.setLeftTopRightBottom(0, 0, width, height); } else { setDisplayListProperties(displayList); } } } else if (!isLayer) { mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; mPrivateFlags &= ~PFLAG_DIRTY_MASK; } return displayList; } /** * Get the DisplayList for the HardwareLayer * * @param layer The HardwareLayer whose DisplayList we want * @return A DisplayList fopr the specified HardwareLayer */ private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { DisplayList displayList = getDisplayList(layer.getDisplayList(), true); layer.setDisplayList(displayList); return displayList; } /** *

Returns a display list that can be used to draw this view again * without executing its draw method.

* * @return A DisplayList ready to replay, or null if caching is not enabled. * * @hide */ public DisplayList getDisplayList() { mDisplayList = getDisplayList(mDisplayList, false); return mDisplayList; } private void clearDisplayList() { if (mDisplayList != null) { mDisplayList.clear(); } } private void resetDisplayList() { if (mDisplayList != null) { mDisplayList.reset(); } } /** *

Calling this method is equivalent to calling getDrawingCache(false).

* * @return A non-scaled bitmap representing this view or null if cache is disabled. * * @see #getDrawingCache(boolean) */ public Bitmap getDrawingCache() { return getDrawingCache(false); } /** *

Returns the bitmap in which this view drawing is cached. The returned bitmap * is null when caching is disabled. If caching is enabled and the cache is not ready, * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not * draw from the cache when the cache is enabled. To benefit from the cache, you must * request the drawing cache by calling this method and draw it on screen if the * returned bitmap is not null.

* *

Note about auto scaling in compatibility mode: When auto scaling is not enabled, * this method will create a bitmap of the same size as this view. Because this bitmap * will be drawn scaled by the parent ViewGroup, the result on screen might show * scaling artifacts. To avoid such artifacts, you should call this method by setting * the auto scaling to true. Doing so, however, will generate a bitmap of a different * size than the view. This implies that your application must be able to handle this * size.

* * @param autoScale Indicates whether the generated bitmap should be scaled based on * the current density of the screen when the application is in compatibility * mode. * * @return A bitmap representing this view or null if cache is disabled. * * @see #setDrawingCacheEnabled(boolean) * @see #isDrawingCacheEnabled() * @see #buildDrawingCache(boolean) * @see #destroyDrawingCache() */ public Bitmap getDrawingCache(boolean autoScale) { if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { return null; } if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { buildDrawingCache(autoScale); } return autoScale ? mDrawingCache : mUnscaledDrawingCache; } /** *

Frees the resources used by the drawing cache. If you call * {@link #buildDrawingCache()} manually without calling * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you * should cleanup the cache with this method afterwards.

* * @see #setDrawingCacheEnabled(boolean) * @see #buildDrawingCache() * @see #getDrawingCache() */ public void destroyDrawingCache() { if (mDrawingCache != null) { mDrawingCache.recycle(); mDrawingCache = null; } if (mUnscaledDrawingCache != null) { mUnscaledDrawingCache.recycle(); mUnscaledDrawingCache = null; } } /** * Setting a solid background color for the drawing cache's bitmaps will improve * performance and memory usage. Note, though that this should only be used if this * view will always be drawn on top of a solid color. * * @param color The background color to use for the drawing cache's bitmap * * @see #setDrawingCacheEnabled(boolean) * @see #buildDrawingCache() * @see #getDrawingCache() */ public void setDrawingCacheBackgroundColor(int color) { if (color != mDrawingCacheBackgroundColor) { mDrawingCacheBackgroundColor = color; mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; } } /** * @see #setDrawingCacheBackgroundColor(int) * * @return The background color to used for the drawing cache's bitmap */ public int getDrawingCacheBackgroundColor() { return mDrawingCacheBackgroundColor; } /** *

Calling this method is equivalent to calling buildDrawingCache(false).

* * @see #buildDrawingCache(boolean) */ public void buildDrawingCache() { buildDrawingCache(false); } /** *

Forces the drawing cache to be built if the drawing cache is invalid.

* *

If you call {@link #buildDrawingCache()} manually without calling * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.

* *

Note about auto scaling in compatibility mode: When auto scaling is not enabled, * this method will create a bitmap of the same size as this view. Because this bitmap * will be drawn scaled by the parent ViewGroup, the result on screen might show * scaling artifacts. To avoid such artifacts, you should call this method by setting * the auto scaling to true. Doing so, however, will generate a bitmap of a different * size than the view. This implies that your application must be able to handle this * size.

* *

You should avoid calling this method when hardware acceleration is enabled. If * you do not need the drawing cache bitmap, calling this method will increase memory * usage and cause the view to be rendered in software once, thus negatively impacting * performance.

* * @see #getDrawingCache() * @see #destroyDrawingCache() */ public void buildDrawingCache(boolean autoScale) { if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? mDrawingCache == null : mUnscaledDrawingCache == null)) { mCachingFailed = false; int width = mRight - mLeft; int height = mBottom - mTop; final AttachInfo attachInfo = mAttachInfo; final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; if (autoScale && scalingRequired) { width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); } final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); final long drawingCacheSize = ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { if (width > 0 && height > 0) { Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " + projectedBitmapSize + " bytes, only " + drawingCacheSize + " available"); } destroyDrawingCache(); mCachingFailed = true; return; } boolean clear = true; Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { Bitmap.Config quality; if (!opaque) { // Never pick ARGB_4444 because it looks awful // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { case DRAWING_CACHE_QUALITY_AUTO: case DRAWING_CACHE_QUALITY_LOW: case DRAWING_CACHE_QUALITY_HIGH: default: quality = Bitmap.Config.ARGB_8888; break; } } else { // Optimization for translucent windows // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; } // Try to cleanup memory if (bitmap != null) bitmap.recycle(); try { bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), width, height, quality); bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); if (autoScale) { mDrawingCache = bitmap; } else { mUnscaledDrawingCache = bitmap; } if (opaque && use32BitCache) bitmap.setHasAlpha(false); } catch (OutOfMemoryError e) { // If there is not enough memory to create the bitmap cache, just // ignore the issue as bitmap caches are not required to draw the // view hierarchy if (autoScale) { mDrawingCache = null; } else { mUnscaledDrawingCache = null; } mCachingFailed = true; return; } clear = drawingCacheBackgroundColor != 0; } Canvas canvas; if (attachInfo != null) { canvas = attachInfo.mCanvas; if (canvas == null) { canvas = new Canvas(); } canvas.setBitmap(bitmap); // Temporarily clobber the cached Canvas in case one of our children // is also using a drawing cache. Without this, the children would // steal the canvas by attaching their own bitmap to it and bad, bad // thing would happen (invisible views, corrupted drawings, etc.) attachInfo.mCanvas = null; } else { // This case should hopefully never or seldom happen canvas = new Canvas(bitmap); } if (clear) { bitmap.eraseColor(drawingCacheBackgroundColor); } computeScroll(); final int restoreCount = canvas.save(); if (autoScale && scalingRequired) { final float scale = attachInfo.mApplicationScale; canvas.scale(scale, scale); } canvas.translate(-mScrollX, -mScrollY); mPrivateFlags |= PFLAG_DRAWN; if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || mLayerType != LAYER_TYPE_NONE) { mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; } // Fast path for layouts with no backgrounds if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { mPrivateFlags &= ~PFLAG_DIRTY_MASK; dispatchDraw(canvas); if (mOverlay != null && !mOverlay.isEmpty()) { mOverlay.getOverlayView().draw(canvas); } } else { draw(canvas); } canvas.restoreToCount(restoreCount); canvas.setBitmap(null); if (attachInfo != null) { // Restore the cached Canvas for our siblings attachInfo.mCanvas = canvas; } } } /** * Create a snapshot of the view into a bitmap. We should probably make * some form of this public, but should think about the API. */ Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { int width = mRight - mLeft; int height = mBottom - mTop; final AttachInfo attachInfo = mAttachInfo; final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; width = (int) ((width * scale) + 0.5f); height = (int) ((height * scale) + 0.5f); Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), width > 0 ? width : 1, height > 0 ? height : 1, quality); if (bitmap == null) { throw new OutOfMemoryError(); } Resources resources = getResources(); if (resources != null) { bitmap.setDensity(resources.getDisplayMetrics().densityDpi); } Canvas canvas; if (attachInfo != null) { canvas = attachInfo.mCanvas; if (canvas == null) { canvas = new Canvas(); } canvas.setBitmap(bitmap); // Temporarily clobber the cached Canvas in case one of our children // is also using a drawing cache. Without this, the children would // steal the canvas by attaching their own bitmap to it and bad, bad // things would happen (invisible views, corrupted drawings, etc.) attachInfo.mCanvas = null; } else { // This case should hopefully never or seldom happen canvas = new Canvas(bitmap); } if ((backgroundColor & 0xff000000) != 0) { bitmap.eraseColor(backgroundColor); } computeScroll(); final int restoreCount = canvas.save(); canvas.scale(scale, scale); canvas.translate(-mScrollX, -mScrollY); // Temporarily remove the dirty mask int flags = mPrivateFlags; mPrivateFlags &= ~PFLAG_DIRTY_MASK; // Fast path for layouts with no backgrounds if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { dispatchDraw(canvas); if (mOverlay != null && !mOverlay.isEmpty()) { mOverlay.getOverlayView().draw(canvas); } } else { draw(canvas); } mPrivateFlags = flags; canvas.restoreToCount(restoreCount); canvas.setBitmap(null); if (attachInfo != null) { // Restore the cached Canvas for our siblings attachInfo.mCanvas = canvas; } return bitmap; } /** * Indicates whether this View is currently in edit mode. A View is usually * in edit mode when displayed within a developer tool. For instance, if * this View is being drawn by a visual user interface builder, this method * should return true. * * Subclasses should check the return value of this method to provide * different behaviors if their normal behavior might interfere with the * host environment. For instance: the class spawns a thread in its * constructor, the drawing code relies on device-specific features, etc. * * This method is usually checked in the drawing code of custom widgets. * * @return True if this View is in edit mode, false otherwise. */ public boolean isInEditMode() { return false; } /** * If the View draws content inside its padding and enables fading edges, * it needs to support padding offsets. Padding offsets are added to the * fading edges to extend the length of the fade so that it covers pixels * drawn inside the padding. * * Subclasses of this class should override this method if they need * to draw content inside the padding. * * @return True if padding offset must be applied, false otherwise. * * @see #getLeftPaddingOffset() * @see #getRightPaddingOffset() * @see #getTopPaddingOffset() * @see #getBottomPaddingOffset() * * @since CURRENT */ protected boolean isPaddingOffsetRequired() { return false; } /** * Amount by which to extend the left fading region. Called only when * {@link #isPaddingOffsetRequired()} returns true. * * @return The left padding offset in pixels. * * @see #isPaddingOffsetRequired() * * @since CURRENT */ protected int getLeftPaddingOffset() { return 0; } /** * Amount by which to extend the right fading region. Called only when * {@link #isPaddingOffsetRequired()} returns true. * * @return The right padding offset in pixels. * * @see #isPaddingOffsetRequired() * * @since CURRENT */ protected int getRightPaddingOffset() { return 0; } /** * Amount by which to extend the top fading region. Called only when * {@link #isPaddingOffsetRequired()} returns true. * * @return The top padding offset in pixels. * * @see #isPaddingOffsetRequired() * * @since CURRENT */ protected int getTopPaddingOffset() { return 0; } /** * Amount by which to extend the bottom fading region. Called only when * {@link #isPaddingOffsetRequired()} returns true. * * @return The bottom padding offset in pixels. * * @see #isPaddingOffsetRequired() * * @since CURRENT */ protected int getBottomPaddingOffset() { return 0; } /** * @hide * @param offsetRequired */ protected int getFadeTop(boolean offsetRequired) { int top = mPaddingTop; if (offsetRequired) top += getTopPaddingOffset(); return top; } /** * @hide * @param offsetRequired */ protected int getFadeHeight(boolean offsetRequired) { int padding = mPaddingTop; if (offsetRequired) padding += getTopPaddingOffset(); return mBottom - mTop - mPaddingBottom - padding; } /** *

Indicates whether this view is attached to a hardware accelerated * window or not.

* *

Even if this method returns true, it does not mean that every call * to {@link #draw(android.graphics.Canvas)} will be made with an hardware * accelerated {@link android.graphics.Canvas}. For instance, if this view * is drawn onto an offscreen {@link android.graphics.Bitmap} and its * window is hardware accelerated, * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely * return false, and this method will return true.

* * @return True if the view is attached to a window and the window is * hardware accelerated; false in any other case. */ public boolean isHardwareAccelerated() { return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; } /** * Sets a rectangular area on this view to which the view will be clipped * when it is drawn. Setting the value to null will remove the clip bounds * and the view will draw normally, using its full bounds. * * @param clipBounds The rectangular area, in the local coordinates of * this view, to which future drawing operations will be clipped. */ public void setClipBounds(Rect clipBounds) { if (clipBounds != null) { if (clipBounds.equals(mClipBounds)) { return; } if (mClipBounds == null) { invalidate(); mClipBounds = new Rect(clipBounds); } else { invalidate(Math.min(mClipBounds.left, clipBounds.left), Math.min(mClipBounds.top, clipBounds.top), Math.max(mClipBounds.right, clipBounds.right), Math.max(mClipBounds.bottom, clipBounds.bottom)); mClipBounds.set(clipBounds); } } else { if (mClipBounds != null) { invalidate(); mClipBounds = null; } } } /** * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. * * @return A copy of the current clip bounds if clip bounds are set, * otherwise null. */ public Rect getClipBounds() { return (mClipBounds != null) ? new Rect(mClipBounds) : null; } /** * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common * case of an active Animation being run on the view. */ private boolean drawAnimation(ViewGroup parent, long drawingTime, Animation a, boolean scalingRequired) { Transformation invalidationTransform; final int flags = parent.mGroupFlags; final boolean initialized = a.isInitialized(); if (!initialized) { a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); onAnimationStart(); } final Transformation t = parent.getChildTransformation(); boolean more = a.getTransformation(drawingTime, t, 1f); if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { if (parent.mInvalidationTransformation == null) { parent.mInvalidationTransformation = new Transformation(); } invalidationTransform = parent.mInvalidationTransformation; a.getTransformation(drawingTime, invalidationTransform, 1f); } else { invalidationTransform = t; } if (more) { if (!a.willChangeBounds()) { if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { // The child need to draw an animation, potentially offscreen, so // make sure we do not cancel invalidate requests parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; parent.invalidate(mLeft, mTop, mRight, mBottom); } } else { if (parent.mInvalidateRegion == null) { parent.mInvalidateRegion = new RectF(); } final RectF region = parent.mInvalidateRegion; a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, invalidationTransform); // The child need to draw an animation, potentially offscreen, so // make sure we do not cancel invalidate requests parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; final int left = mLeft + (int) region.left; final int top = mTop + (int) region.top; parent.invalidate(left, top, left + (int) (region.width() + .5f), top + (int) (region.height() + .5f)); } } return more; } /** * This method is called by getDisplayList() when a display list is created or re-rendered. * It sets or resets the current value of all properties on that display list (resetting is * necessary when a display list is being re-created, because we need to make sure that * previously-set transform values */ void setDisplayListProperties(DisplayList displayList) { if (displayList != null) { displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); displayList.setHasOverlappingRendering(hasOverlappingRendering()); if (mParent instanceof ViewGroup) { displayList.setClipToBounds( (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); } float alpha = 1; if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { ViewGroup parentVG = (ViewGroup) mParent; final Transformation t = parentVG.getChildTransformation(); if (parentVG.getChildStaticTransformation(this, t)) { final int transformType = t.getTransformationType(); if (transformType != Transformation.TYPE_IDENTITY) { if ((transformType & Transformation.TYPE_ALPHA) != 0) { alpha = t.getAlpha(); } if ((transformType & Transformation.TYPE_MATRIX) != 0) { displayList.setMatrix(t.getMatrix()); } } } } if (mTransformationInfo != null) { alpha *= getFinalAlpha(); if (alpha < 1) { final int multipliedAlpha = (int) (255 * alpha); if (onSetAlpha(multipliedAlpha)) { alpha = 1; } } displayList.setTransformationInfo(alpha, mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, mTransformationInfo.mRotation, mTransformationInfo.mRotationX, mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, mTransformationInfo.mScaleY); if (mTransformationInfo.mCamera == null) { mTransformationInfo.mCamera = new Camera(); mTransformationInfo.matrix3D = new Matrix(); } displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { displayList.setPivotX(getPivotX()); displayList.setPivotY(getPivotY()); } } else if (alpha < 1) { displayList.setAlpha(alpha); } } } /** * This method is called by ViewGroup.drawChild() to have each child view draw itself. * This draw() method is an implementation detail and is not intended to be overridden or * to be called from anywhere else other than ViewGroup.drawChild(). */ boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; boolean more = false; final boolean childHasIdentityMatrix = hasIdentityMatrix(); final int flags = parent.mGroupFlags; if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { parent.getChildTransformation().clear(); parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; } Transformation transformToApply = null; boolean concatMatrix = false; boolean scalingRequired = false; boolean caching; int layerType = getLayerType(); final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { caching = true; // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; } else { caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; } final Animation a = getAnimation(); if (a != null) { more = drawAnimation(parent, drawingTime, a, scalingRequired); concatMatrix = a.willChangeTransformationMatrix(); if (concatMatrix) { mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; } transformToApply = parent.getChildTransformation(); } else { if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { // No longer animating: clear out old animation matrix mDisplayList.setAnimationMatrix(null); mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; } if (!useDisplayListProperties && (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { final Transformation t = parent.getChildTransformation(); final boolean hasTransform = parent.getChildStaticTransformation(this, t); if (hasTransform) { final int transformType = t.getTransformationType(); transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null; concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; } } } concatMatrix |= !childHasIdentityMatrix; // Sets the flag as early as possible to allow draw() implementations // to call invalidate() successfully when doing animations mPrivateFlags |= PFLAG_DRAWN; if (!concatMatrix && (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; return more; } mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; if (hardwareAccelerated) { // Clear INVALIDATED flag to allow invalidation to occur during rendering, but // retain the flag's value temporarily in the mRecreateDisplayList flag mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; mPrivateFlags &= ~PFLAG_INVALIDATED; } DisplayList displayList = null; Bitmap cache = null; boolean hasDisplayList = false; if (caching) { if (!hardwareAccelerated) { if (layerType != LAYER_TYPE_NONE) { layerType = LAYER_TYPE_SOFTWARE; buildDrawingCache(true); } cache = getDrawingCache(true); } else { switch (layerType) { case LAYER_TYPE_SOFTWARE: if (useDisplayListProperties) { hasDisplayList = canHaveDisplayList(); } else { buildDrawingCache(true); cache = getDrawingCache(true); } break; case LAYER_TYPE_HARDWARE: if (useDisplayListProperties) { hasDisplayList = canHaveDisplayList(); } break; case LAYER_TYPE_NONE: // Delay getting the display list until animation-driven alpha values are // set up and possibly passed on to the view hasDisplayList = canHaveDisplayList(); break; } } } useDisplayListProperties &= hasDisplayList; if (useDisplayListProperties) { displayList = getDisplayList(); if (!displayList.isValid()) { // Uncommon, but possible. If a view is removed from the hierarchy during the call // to getDisplayList(), the display list will be marked invalid and we should not // try to use it again. displayList = null; hasDisplayList = false; useDisplayListProperties = false; } } int sx = 0; int sy = 0; if (!hasDisplayList) { computeScroll(); sx = mScrollX; sy = mScrollY; } final boolean hasNoCache = cache == null || hasDisplayList; final boolean offsetForScroll = cache == null && !hasDisplayList && layerType != LAYER_TYPE_HARDWARE; int restoreTo = -1; if (!useDisplayListProperties || transformToApply != null) { restoreTo = canvas.save(); } if (offsetForScroll) { canvas.translate(mLeft - sx, mTop - sy); } else { if (!useDisplayListProperties) { canvas.translate(mLeft, mTop); } if (scalingRequired) { if (useDisplayListProperties) { // TODO: Might not need this if we put everything inside the DL restoreTo = canvas.save(); } // mAttachInfo cannot be null, otherwise scalingRequired == false final float scale = 1.0f / mAttachInfo.mApplicationScale; canvas.scale(scale, scale); } } float alpha = useDisplayListProperties ? 1 : (getAlpha() * getTransitionAlpha()); if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { if (transformToApply != null || !childHasIdentityMatrix) { int transX = 0; int transY = 0; if (offsetForScroll) { transX = -sx; transY = -sy; } if (transformToApply != null) { if (concatMatrix) { if (useDisplayListProperties) { displayList.setAnimationMatrix(transformToApply.getMatrix()); } else { // Undo the scroll translation, apply the transformation matrix, // then redo the scroll translate to get the correct result. canvas.translate(-transX, -transY); canvas.concat(transformToApply.getMatrix()); canvas.translate(transX, transY); } parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; } float transformAlpha = transformToApply.getAlpha(); if (transformAlpha < 1) { alpha *= transformAlpha; parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; } } if (!childHasIdentityMatrix && !useDisplayListProperties) { canvas.translate(-transX, -transY); canvas.concat(getMatrix()); canvas.translate(transX, transY); } } // Deal with alpha if it is or used to be <1 if (alpha < 1 || (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { if (alpha < 1) { mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; } else { mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; } parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; if (hasNoCache) { final int multipliedAlpha = (int) (255 * alpha); if (!onSetAlpha(multipliedAlpha)) { int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || layerType != LAYER_TYPE_NONE) { layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; } if (useDisplayListProperties) { displayList.setAlpha(alpha * getAlpha() * getTransitionAlpha()); } else if (layerType == LAYER_TYPE_NONE) { final int scrollX = hasDisplayList ? 0 : sx; final int scrollY = hasDisplayList ? 0 : sy; canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, scrollY + mBottom - mTop, multipliedAlpha, layerFlags); } } else { // Alpha is handled by the child directly, clobber the layer's alpha mPrivateFlags |= PFLAG_ALPHA_SET; } } } } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { onSetAlpha(255); mPrivateFlags &= ~PFLAG_ALPHA_SET; } if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && !useDisplayListProperties && cache == null) { if (offsetForScroll) { canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); } else { if (!scalingRequired || cache == null) { canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); } else { canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); } } } if (!useDisplayListProperties && hasDisplayList) { displayList = getDisplayList(); if (!displayList.isValid()) { // Uncommon, but possible. If a view is removed from the hierarchy during the call // to getDisplayList(), the display list will be marked invalid and we should not // try to use it again. displayList = null; hasDisplayList = false; } } if (hasNoCache) { boolean layerRendered = false; if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { final HardwareLayer layer = getHardwareLayer(); if (layer != null && layer.isValid()) { mLayerPaint.setAlpha((int) (alpha * 255)); ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); layerRendered = true; } else { final int scrollX = hasDisplayList ? 0 : sx; final int scrollY = hasDisplayList ? 0 : sy; canvas.saveLayer(scrollX, scrollY, scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); } } if (!layerRendered) { if (!hasDisplayList) { // Fast path for layouts with no backgrounds if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { mPrivateFlags &= ~PFLAG_DIRTY_MASK; dispatchDraw(canvas); } else { draw(canvas); } } else { mPrivateFlags &= ~PFLAG_DIRTY_MASK; ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); } } } else if (cache != null) { mPrivateFlags &= ~PFLAG_DIRTY_MASK; Paint cachePaint; if (layerType == LAYER_TYPE_NONE) { cachePaint = parent.mCachePaint; if (cachePaint == null) { cachePaint = new Paint(); cachePaint.setDither(false); parent.mCachePaint = cachePaint; } if (alpha < 1) { cachePaint.setAlpha((int) (alpha * 255)); parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { cachePaint.setAlpha(255); parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; } } else { cachePaint = mLayerPaint; cachePaint.setAlpha((int) (alpha * 255)); } canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); } if (restoreTo >= 0) { canvas.restoreToCount(restoreTo); } if (a != null && !more) { if (!hardwareAccelerated && !a.getFillAfter()) { onSetAlpha(255); } parent.finishAnimatingView(this, a); } if (more && hardwareAccelerated) { if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { // alpha animations should cause the child to recreate its display list invalidate(true); } } mRecreateDisplayList = false; return more; } /** * Manually render this view (and all of its children) to the given Canvas. * The view must have already done a full layout before this function is * called. When implementing a view, implement * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. * If you do need to override this method, call the superclass version. * * @param canvas The Canvas to which the View is rendered. */ public void draw(Canvas canvas) { if (mClipBounds != null) { canvas.clipRect(mClipBounds); } final int privateFlags = mPrivateFlags; final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; /* * Draw traversal performs several drawing steps which must be executed * in the appropriate order: * * 1. Draw the background * 2. If necessary, save the canvas' layers to prepare for fading * 3. Draw view's content * 4. Draw children * 5. If necessary, draw the fading edges and restore layers * 6. Draw decorations (scrollbars for instance) */ // Step 1, draw the background, if needed int saveCount; if (!dirtyOpaque) { final Drawable background = mBackground; if (background != null) { final int scrollX = mScrollX; final int scrollY = mScrollY; if (mBackgroundSizeChanged) { background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); mBackgroundSizeChanged = false; } if ((scrollX | scrollY) == 0) { background.draw(canvas); } else { canvas.translate(scrollX, scrollY); background.draw(canvas); canvas.translate(-scrollX, -scrollY); } } } // skip step 2 & 5 if possible (common case) final int viewFlags = mViewFlags; boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; if (!verticalEdges && !horizontalEdges) { // Step 3, draw the content if (!dirtyOpaque) onDraw(canvas); // Step 4, draw the children dispatchDraw(canvas); // Step 6, draw decorations (scrollbars) onDrawScrollBars(canvas); if (mOverlay != null && !mOverlay.isEmpty()) { mOverlay.getOverlayView().dispatchDraw(canvas); } // we're done... return; } /* * Here we do the full fledged routine... * (this is an uncommon case where speed matters less, * this is why we repeat some of the tests that have been * done above) */ boolean drawTop = false; boolean drawBottom = false; boolean drawLeft = false; boolean drawRight = false; float topFadeStrength = 0.0f; float bottomFadeStrength = 0.0f; float leftFadeStrength = 0.0f; float rightFadeStrength = 0.0f; // Step 2, save the canvas' layers int paddingLeft = mPaddingLeft; final boolean offsetRequired = isPaddingOffsetRequired(); if (offsetRequired) { paddingLeft += getLeftPaddingOffset(); } int left = mScrollX + paddingLeft; int right = left + mRight - mLeft - mPaddingRight - paddingLeft; int top = mScrollY + getFadeTop(offsetRequired); int bottom = top + getFadeHeight(offsetRequired); if (offsetRequired) { right += getRightPaddingOffset(); bottom += getBottomPaddingOffset(); } final ScrollabilityCache scrollabilityCache = mScrollCache; final float fadeHeight = scrollabilityCache.fadingEdgeLength; int length = (int) fadeHeight; // clip the fade length if top and bottom fades overlap // overlapping fades produce odd-looking artifacts if (verticalEdges && (top + length > bottom - length)) { length = (bottom - top) / 2; } // also clip horizontal fades if necessary if (horizontalEdges && (left + length > right - length)) { length = (right - left) / 2; } if (verticalEdges) { topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); drawTop = topFadeStrength * fadeHeight > 1.0f; bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); drawBottom = bottomFadeStrength * fadeHeight > 1.0f; } if (horizontalEdges) { leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); drawLeft = leftFadeStrength * fadeHeight > 1.0f; rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); drawRight = rightFadeStrength * fadeHeight > 1.0f; } saveCount = canvas.getSaveCount(); int solidColor = getSolidColor(); if (solidColor == 0) { final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; if (drawTop) { canvas.saveLayer(left, top, right, top + length, null, flags); } if (drawBottom) { canvas.saveLayer(left, bottom - length, right, bottom, null, flags); } if (drawLeft) { canvas.saveLayer(left, top, left + length, bottom, null, flags); } if (drawRight) { canvas.saveLayer(right - length, top, right, bottom, null, flags); } } else { scrollabilityCache.setFadeColor(solidColor); } // Step 3, draw the content if (!dirtyOpaque) onDraw(canvas); // Step 4, draw the children dispatchDraw(canvas); // Step 5, draw the fade effect and restore layers final Paint p = scrollabilityCache.paint; final Matrix matrix = scrollabilityCache.matrix; final Shader fade = scrollabilityCache.shader; if (drawTop) { matrix.setScale(1, fadeHeight * topFadeStrength); matrix.postTranslate(left, top); fade.setLocalMatrix(matrix); canvas.drawRect(left, top, right, top + length, p); } if (drawBottom) { matrix.setScale(1, fadeHeight * bottomFadeStrength); matrix.postRotate(180); matrix.postTranslate(left, bottom); fade.setLocalMatrix(matrix); canvas.drawRect(left, bottom - length, right, bottom, p); } if (drawLeft) { matrix.setScale(1, fadeHeight * leftFadeStrength); matrix.postRotate(-90); matrix.postTranslate(left, top); fade.setLocalMatrix(matrix); canvas.drawRect(left, top, left + length, bottom, p); } if (drawRight) { matrix.setScale(1, fadeHeight * rightFadeStrength); matrix.postRotate(90); matrix.postTranslate(right, top); fade.setLocalMatrix(matrix); canvas.drawRect(right - length, top, right, bottom, p); } canvas.restoreToCount(saveCount); // Step 6, draw decorations (scrollbars) onDrawScrollBars(canvas); if (mOverlay != null && !mOverlay.isEmpty()) { mOverlay.getOverlayView().dispatchDraw(canvas); } } /** * Returns the overlay for this view, creating it if it does not yet exist. * Adding drawables to the overlay will cause them to be displayed whenever * the view itself is redrawn. Objects in the overlay should be actively * managed: remove them when they should not be displayed anymore. The * overlay will always have the same size as its host view. * *

Note: Overlays do not currently work correctly with {@link * SurfaceView} or {@link TextureView}; contents in overlays for these * types of views may not display correctly.

* * @return The ViewOverlay object for this view. * @see ViewOverlay */ public ViewOverlay getOverlay() { if (mOverlay == null) { mOverlay = new ViewOverlay(mContext, this); } return mOverlay; } /** * Override this if your view is known to always be drawn on top of a solid color background, * and needs to draw fading edges. Returning a non-zero color enables the view system to * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha * should be set to 0xFF. * * @see #setVerticalFadingEdgeEnabled(boolean) * @see #setHorizontalFadingEdgeEnabled(boolean) * * @return The known solid color background for this view, or 0 if the color may vary */ @ViewDebug.ExportedProperty(category = "drawing") public int getSolidColor() { return 0; } /** * Build a human readable string representation of the specified view flags. * * @param flags the view flags to convert to a string * @return a String representing the supplied flags */ private static String printFlags(int flags) { String output = ""; int numFlags = 0; if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { output += "TAKES_FOCUS"; numFlags++; } switch (flags & VISIBILITY_MASK) { case INVISIBLE: if (numFlags > 0) { output += " "; } output += "INVISIBLE"; // USELESS HERE numFlags++; break; case GONE: if (numFlags > 0) { output += " "; } output += "GONE"; // USELESS HERE numFlags++; break; default: break; } return output; } /** * Build a human readable string representation of the specified private * view flags. * * @param privateFlags the private view flags to convert to a string * @return a String representing the supplied flags */ private static String printPrivateFlags(int privateFlags) { String output = ""; int numFlags = 0; if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { output += "WANTS_FOCUS"; numFlags++; } if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { if (numFlags > 0) { output += " "; } output += "FOCUSED"; numFlags++; } if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { if (numFlags > 0) { output += " "; } output += "SELECTED"; numFlags++; } if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { if (numFlags > 0) { output += " "; } output += "IS_ROOT_NAMESPACE"; numFlags++; } if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { if (numFlags > 0) { output += " "; } output += "HAS_BOUNDS"; numFlags++; } if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { if (numFlags > 0) { output += " "; } output += "DRAWN"; // USELESS HERE numFlags++; } return output; } /** *

Indicates whether or not this view's layout will be requested during * the next hierarchy layout pass.

* * @return true if the layout will be forced during next layout pass */ public boolean isLayoutRequested() { return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; } /** * Return true if o is a ViewGroup that is laying out using optical bounds. * @hide */ public static boolean isLayoutModeOptical(Object o) { return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); } private boolean setOpticalFrame(int left, int top, int right, int bottom) { Insets parentInsets = mParent instanceof View ? ((View) mParent).getOpticalInsets() : Insets.NONE; Insets childInsets = getOpticalInsets(); return setFrame( left + parentInsets.left - childInsets.left, top + parentInsets.top - childInsets.top, right + parentInsets.left + childInsets.right, bottom + parentInsets.top + childInsets.bottom); } /** * Assign a size and position to a view and all of its * descendants * *

This is the second phase of the layout mechanism. * (The first is measuring). In this phase, each parent calls * layout on all of its children to position them. * This is typically done using the child measurements * that were stored in the measure pass().

* *

Derived classes should not override this method. * Derived classes with children should override * onLayout. In that method, they should * call layout on each of their children.

* * @param l Left position, relative to parent * @param t Top position, relative to parent * @param r Right position, relative to parent * @param b Bottom position, relative to parent */ @SuppressWarnings({"unchecked"}) public void layout(int l, int t, int r, int b) { if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) { onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec); mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; } int oldL = mLeft; int oldT = mTop; int oldB = mBottom; int oldR = mRight; //setFrame此方法是用来设置View的上下左右边距用的 boolean changed = isLayoutModeOptical(mParent) ? setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { onLayout(changed, l, t, r, b); mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; ListenerInfo li = mListenerInfo; if (li != null && li.mOnLayoutChangeListeners != null) { ArrayList listenersCopy = (ArrayList)li.mOnLayoutChangeListeners.clone(); int numListeners = listenersCopy.size(); for (int i = 0; i < numListeners; ++i) { listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); } } } mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; mPrivateFlags3 |= PFLAG3_IS_LAID_OUT; } /** * Called from layout when this view should * assign a size and position to each of its children. * * Derived classes with children should override * this method and call layout on each of * their children. * @param changed This is a new size or position for this view * @param left Left position, relative to parent * @param top Top position, relative to parent * @param right Right position, relative to parent * @param bottom Bottom position, relative to parent */ protected void onLayout(boolean changed, int left, int top, int right, int bottom) { } /** * Assign a size and position to this view. * * This is called from layout. * * @param left Left position, relative to parent * @param top Top position, relative to parent * @param right Right position, relative to parent * @param bottom Bottom position, relative to parent * @return true if the new size and position are different than the * previous ones * {@hide} */ //我们可以看到如果新的高度和宽工改变之后,会调用此函数重新设置View的四个参数 //int left, int top, int right, int bottom这四个参数指定了View将要布局的位置。而绘制的时候是通过这四个参数来绘制,所以我们在VIew中调用Layout方法可以实现子View的布局 protected boolean setFrame(int left, int top, int right, int bottom) { boolean changed = false; if (DBG) { Log.d("View", this + " View.setFrame(" + left + "," + top + "," + right + "," + bottom + ")"); } if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { changed = true; // Remember our drawn bit int drawn = mPrivateFlags & PFLAG_DRAWN; int oldWidth = mRight - mLeft; int oldHeight = mBottom - mTop; int newWidth = right - left; int newHeight = bottom - top; boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); // Invalidate our old position invalidate(sizeChanged); mLeft = left; mTop = top; mRight = right; mBottom = bottom; if (mDisplayList != null) { mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); } mPrivateFlags |= PFLAG_HAS_BOUNDS; if (sizeChanged) { if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { // A change in dimension means an auto-centered pivot point changes, too if (mTransformationInfo != null) { mTransformationInfo.mMatrixDirty = true; } } sizeChange(newWidth, newHeight, oldWidth, oldHeight); } if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { // If we are visible, force the DRAWN bit to on so that // this invalidate will go through (at least to our parent). // This is because someone may have invalidated this view // before this call to setFrame came in, thereby clearing // the DRAWN bit. mPrivateFlags |= PFLAG_DRAWN; invalidate(sizeChanged); // parent display list may need to be recreated based on a change in the bounds // of any child invalidateParentCaches(); } // Reset drawn bit to original value (invalidate turns it off) mPrivateFlags |= drawn; mBackgroundSizeChanged = true; notifySubtreeAccessibilityStateChangedIfNeeded(); } return changed; } private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); if (mOverlay != null) { mOverlay.getOverlayView().setRight(newWidth); mOverlay.getOverlayView().setBottom(newHeight); } } /** * Finalize inflating a view from XML. This is called as the last phase * of inflation, after all child views have been added. * *

Even if the subclass overrides onFinishInflate, they should always be * sure to call the super method, so that we get called. */ protected void onFinishInflate() { } /** * Returns the resources associated with this view. * * @return Resources object. */ public Resources getResources() { return mResources; } /** * Invalidates the specified Drawable. * * @param drawable the drawable to invalidate */ public void invalidateDrawable(Drawable drawable) { if (verifyDrawable(drawable)) { final Rect dirty = drawable.getBounds(); final int scrollX = mScrollX; final int scrollY = mScrollY; invalidate(dirty.left + scrollX, dirty.top + scrollY, dirty.right + scrollX, dirty.bottom + scrollY); } } /** * Schedules an action on a drawable to occur at a specified time. * * @param who the recipient of the action * @param what the action to run on the drawable * @param when the time at which the action must occur. Uses the * {@link SystemClock#uptimeMillis} timebase. */ public void scheduleDrawable(Drawable who, Runnable what, long when) { if (verifyDrawable(who) && what != null) { final long delay = when - SystemClock.uptimeMillis(); if (mAttachInfo != null) { mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( Choreographer.CALLBACK_ANIMATION, what, who, Choreographer.subtractFrameDelay(delay)); } else { ViewRootImpl.getRunQueue().postDelayed(what, delay); } } } /** * Cancels a scheduled action on a drawable. * * @param who the recipient of the action * @param what the action to cancel */ public void unscheduleDrawable(Drawable who, Runnable what) { if (verifyDrawable(who) && what != null) { if (mAttachInfo != null) { mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( Choreographer.CALLBACK_ANIMATION, what, who); } else { ViewRootImpl.getRunQueue().removeCallbacks(what); } } } /** * Unschedule any events associated with the given Drawable. This can be * used when selecting a new Drawable into a view, so that the previous * one is completely unscheduled. * * @param who The Drawable to unschedule. * * @see #drawableStateChanged */ public void unscheduleDrawable(Drawable who) { if (mAttachInfo != null && who != null) { mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( Choreographer.CALLBACK_ANIMATION, null, who); } } /** * Resolve the Drawables depending on the layout direction. This is implicitly supposing * that the View directionality can and will be resolved before its Drawables. * * Will call {@link View#onResolveDrawables} when resolution is done. * * @hide */ protected void resolveDrawables() { // Drawables resolution may need to happen before resolving the layout direction (which is // done only during the measure() call). // If the layout direction is not resolved yet, we cannot resolve the Drawables except in // one case: when the raw layout direction has not been defined as LAYOUT_DIRECTION_INHERIT. // So, if the raw layout direction is LAYOUT_DIRECTION_LTR or LAYOUT_DIRECTION_RTL or // LAYOUT_DIRECTION_LOCALE, we can "cheat" and we don't need to wait for the layout // direction to be resolved as its resolved value will be the same as its raw value. if (!isLayoutDirectionResolved() && getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT) { return; } final int layoutDirection = isLayoutDirectionResolved() ? getLayoutDirection() : getRawLayoutDirection(); if (mBackground != null) { mBackground.setLayoutDirection(layoutDirection); } mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; onResolveDrawables(layoutDirection); } /** * Called when layout direction has been resolved. * * The default implementation does nothing. * * @param layoutDirection The resolved layout direction. * * @see #LAYOUT_DIRECTION_LTR * @see #LAYOUT_DIRECTION_RTL * * @hide */ public void onResolveDrawables(int layoutDirection) { } /** * @hide */ protected void resetResolvedDrawables() { mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; } private boolean isDrawablesResolved() { return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; } /** * If your view subclass is displaying its own Drawable objects, it should * override this function and return true for any Drawable it is * displaying. This allows animations for those drawables to be * scheduled. * *

Be sure to call through to the super class when overriding this * function. * * @param who The Drawable to verify. Return true if it is one you are * displaying, else return the result of calling through to the * super class. * * @return boolean If true than the Drawable is being displayed in the * view; else false and it is not allowed to animate. * * @see #unscheduleDrawable(android.graphics.drawable.Drawable) * @see #drawableStateChanged() */ protected boolean verifyDrawable(Drawable who) { return who == mBackground; } /** * This function is called whenever the state of the view changes in such * a way that it impacts the state of drawables being shown. * *

Be sure to call through to the superclass when overriding this * function. * * @see Drawable#setState(int[]) */ protected void drawableStateChanged() { Drawable d = mBackground; if (d != null && d.isStateful()) { d.setState(getDrawableState()); } } /** * Call this to force a view to update its drawable state. This will cause * drawableStateChanged to be called on this view. Views that are interested * in the new state should call getDrawableState. * * @see #drawableStateChanged * @see #getDrawableState */ public void refreshDrawableState() { mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; drawableStateChanged(); ViewParent parent = mParent; if (parent != null) { parent.childDrawableStateChanged(this); } } /** * Return an array of resource IDs of the drawable states representing the * current state of the view. * * @return The current drawable state * * @see Drawable#setState(int[]) * @see #drawableStateChanged() * @see #onCreateDrawableState(int) */ public final int[] getDrawableState() { if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { return mDrawableState; } else { mDrawableState = onCreateDrawableState(0); mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; return mDrawableState; } } /** * Generate the new {@link android.graphics.drawable.Drawable} state for * this view. This is called by the view * system when the cached Drawable state is determined to be invalid. To * retrieve the current state, you should use {@link #getDrawableState}. * * @param extraSpace if non-zero, this is the number of extra entries you * would like in the returned array in which you can place your own * states. * * @return Returns an array holding the current {@link Drawable} state of * the view. * * @see #mergeDrawableStates(int[], int[]) */ protected int[] onCreateDrawableState(int extraSpace) { if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && mParent instanceof View) { return ((View) mParent).onCreateDrawableState(extraSpace); } int[] drawableState; int privateFlags = mPrivateFlags; int viewStateIndex = 0; if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && HardwareRenderer.isAvailable()) { // This is set if HW acceleration is requested, even if the current // process doesn't allow it. This is just to allow app preview // windows to better match their app. viewStateIndex |= VIEW_STATE_ACCELERATED; } if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; final int privateFlags2 = mPrivateFlags2; if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; drawableState = VIEW_STATE_SETS[viewStateIndex]; //noinspection ConstantIfStatement if (false) { Log.i("View", "drawableStateIndex=" + viewStateIndex); Log.i("View", toString() + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) + " fo=" + hasFocus() + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) + " wf=" + hasWindowFocus() + ": " + Arrays.toString(drawableState)); } if (extraSpace == 0) { return drawableState; } final int[] fullState; if (drawableState != null) { fullState = new int[drawableState.length + extraSpace]; System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); } else { fullState = new int[extraSpace]; } return fullState; } /** * Merge your own state values in additionalState into the base * state values baseState that were returned by * {@link #onCreateDrawableState(int)}. * * @param baseState The base state values returned by * {@link #onCreateDrawableState(int)}, which will be modified to also hold your * own additional state values. * * @param additionalState The additional state values you would like * added to baseState; this array is not modified. * * @return As a convenience, the baseState array you originally * passed into the function is returned. * * @see #onCreateDrawableState(int) */ protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { final int N = baseState.length; int i = N - 1; while (i >= 0 && baseState[i] == 0) { i--; } System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); return baseState; } /** * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} * on all Drawable objects associated with this view. */ public void jumpDrawablesToCurrentState() { if (mBackground != null) { mBackground.jumpToCurrentState(); } } /** * Sets the background color for this view. * @param color the color of the background */ @RemotableViewMethod public void setBackgroundColor(int color) { if (mBackground instanceof ColorDrawable) { ((ColorDrawable) mBackground.mutate()).setColor(color); computeOpaqueFlags(); mBackgroundResource = 0; } else { setBackground(new ColorDrawable(color)); } } /** * Set the background to a given resource. The resource should refer to * a Drawable object or 0 to remove the background. * @param resid The identifier of the resource. * * @attr ref android.R.styleable#View_background */ @RemotableViewMethod public void setBackgroundResource(int resid) { if (resid != 0 && resid == mBackgroundResource) { return; } Drawable d= null; if (resid != 0) { d = mResources.getDrawable(resid); } setBackground(d); mBackgroundResource = resid; } /** * Set the background to a given Drawable, or remove the background. If the * background has padding, this View's padding is set to the background's * padding. However, when a background is removed, this View's padding isn't * touched. If setting the padding is desired, please use * {@link #setPadding(int, int, int, int)}. * * @param background The Drawable to use as the background, or null to remove the * background */ public void setBackground(Drawable background) { //noinspection deprecation setBackgroundDrawable(background); } /** * @deprecated use {@link #setBackground(Drawable)} instead */ @Deprecated public void setBackgroundDrawable(Drawable background) { computeOpaqueFlags(); if (background == mBackground) { return; } boolean requestLayout = false; mBackgroundResource = 0; /* * Regardless of whether we're setting a new background or not, we want * to clear the previous drawable. */ if (mBackground != null) { mBackground.setCallback(null); unscheduleDrawable(mBackground); } if (background != null) { Rect padding = sThreadLocal.get(); if (padding == null) { padding = new Rect(); sThreadLocal.set(padding); } resetResolvedDrawables(); background.setLayoutDirection(getLayoutDirection()); if (background.getPadding(padding)) { resetResolvedPadding(); switch (background.getLayoutDirection()) { case LAYOUT_DIRECTION_RTL: mUserPaddingLeftInitial = padding.right; mUserPaddingRightInitial = padding.left; internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); break; case LAYOUT_DIRECTION_LTR: default: mUserPaddingLeftInitial = padding.left; mUserPaddingRightInitial = padding.right; internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); } mLeftPaddingDefined = false; mRightPaddingDefined = false; } // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or // if it has a different minimum size, we should layout again if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || mBackground.getMinimumWidth() != background.getMinimumWidth()) { requestLayout = true; } background.setCallback(this); if (background.isStateful()) { background.setState(getDrawableState()); } background.setVisible(getVisibility() == VISIBLE, false); mBackground = background; if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { mPrivateFlags &= ~PFLAG_SKIP_DRAW; mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; requestLayout = true; } } else { /* Remove the background */ mBackground = null; if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { /* * This view ONLY drew the background before and we're removing * the background, so now it won't draw anything * (hence we SKIP_DRAW) */ mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; mPrivateFlags |= PFLAG_SKIP_DRAW; } /* * When the background is set, we try to apply its padding to this * View. When the background is removed, we don't touch this View's * padding. This is noted in the Javadocs. Hence, we don't need to * requestLayout(), the invalidate() below is sufficient. */ // The old background's minimum size could have affected this // View's layout, so let's requestLayout requestLayout = true; } computeOpaqueFlags(); if (requestLayout) { requestLayout(); } mBackgroundSizeChanged = true; invalidate(true); } /** * Gets the background drawable * * @return The drawable used as the background for this view, if any. * * @see #setBackground(Drawable) * * @attr ref android.R.styleable#View_background */ public Drawable getBackground() { return mBackground; } /** * Sets the padding. The view may add on the space required to display * the scrollbars, depending on the style and visibility of the scrollbars. * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different * from the values set in this call. * * @attr ref android.R.styleable#View_padding * @attr ref android.R.styleable#View_paddingBottom * @attr ref android.R.styleable#View_paddingLeft * @attr ref android.R.styleable#View_paddingRight * @attr ref android.R.styleable#View_paddingTop * @param left the left padding in pixels * @param top the top padding in pixels * @param right the right padding in pixels * @param bottom the bottom padding in pixels */ public void setPadding(int left, int top, int right, int bottom) { resetResolvedPadding(); mUserPaddingStart = UNDEFINED_PADDING; mUserPaddingEnd = UNDEFINED_PADDING; mUserPaddingLeftInitial = left; mUserPaddingRightInitial = right; mLeftPaddingDefined = true; mRightPaddingDefined = true; internalSetPadding(left, top, right, bottom); } /** * @hide */ protected void internalSetPadding(int left, int top, int right, int bottom) { mUserPaddingLeft = left; mUserPaddingRight = right; mUserPaddingBottom = bottom; final int viewFlags = mViewFlags; boolean changed = false; // Common case is there are no scroll bars. if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 ? 0 : getVerticalScrollbarWidth(); switch (mVerticalScrollbarPosition) { case SCROLLBAR_POSITION_DEFAULT: if (isLayoutRtl()) { left += offset; } else { right += offset; } break; case SCROLLBAR_POSITION_RIGHT: right += offset; break; case SCROLLBAR_POSITION_LEFT: left += offset; break; } } if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 ? 0 : getHorizontalScrollbarHeight(); } } if (mPaddingLeft != left) { changed = true; mPaddingLeft = left; } if (mPaddingTop != top) { changed = true; mPaddingTop = top; } if (mPaddingRight != right) { changed = true; mPaddingRight = right; } if (mPaddingBottom != bottom) { changed = true; mPaddingBottom = bottom; } if (changed) { requestLayout(); } } /** * Sets the relative padding. The view may add on the space required to display * the scrollbars, depending on the style and visibility of the scrollbars. * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different * from the values set in this call. * * @attr ref android.R.styleable#View_padding * @attr ref android.R.styleable#View_paddingBottom * @attr ref android.R.styleable#View_paddingStart * @attr ref android.R.styleable#View_paddingEnd * @attr ref android.R.styleable#View_paddingTop * @param start the start padding in pixels * @param top the top padding in pixels * @param end the end padding in pixels * @param bottom the bottom padding in pixels */ public void setPaddingRelative(int start, int top, int end, int bottom) { resetResolvedPadding(); mUserPaddingStart = start; mUserPaddingEnd = end; mLeftPaddingDefined = true; mRightPaddingDefined = true; switch(getLayoutDirection()) { case LAYOUT_DIRECTION_RTL: mUserPaddingLeftInitial = end; mUserPaddingRightInitial = start; internalSetPadding(end, top, start, bottom); break; case LAYOUT_DIRECTION_LTR: default: mUserPaddingLeftInitial = start; mUserPaddingRightInitial = end; internalSetPadding(start, top, end, bottom); } } /** * Returns the top padding of this view. * * @return the top padding in pixels */ public int getPaddingTop() { return mPaddingTop; } /** * Returns the bottom padding of this view. If there are inset and enabled * scrollbars, this value may include the space required to display the * scrollbars as well. * * @return the bottom padding in pixels */ public int getPaddingBottom() { return mPaddingBottom; } /** * Returns the left padding of this view. If there are inset and enabled * scrollbars, this value may include the space required to display the * scrollbars as well. * * @return the left padding in pixels */ public int getPaddingLeft() { if (!isPaddingResolved()) { resolvePadding(); } return mPaddingLeft; } /** * Returns the start padding of this view depending on its resolved layout direction. * If there are inset and enabled scrollbars, this value may include the space * required to display the scrollbars as well. * * @return the start padding in pixels */ public int getPaddingStart() { if (!isPaddingResolved()) { resolvePadding(); } return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? mPaddingRight : mPaddingLeft; } /** * Returns the right padding of this view. If there are inset and enabled * scrollbars, this value may include the space required to display the * scrollbars as well. * * @return the right padding in pixels */ public int getPaddingRight() { if (!isPaddingResolved()) { resolvePadding(); } return mPaddingRight; } /** * Returns the end padding of this view depending on its resolved layout direction. * If there are inset and enabled scrollbars, this value may include the space * required to display the scrollbars as well. * * @return the end padding in pixels */ public int getPaddingEnd() { if (!isPaddingResolved()) { resolvePadding(); } return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? mPaddingLeft : mPaddingRight; } /** * Return if the padding as been set thru relative values * {@link #setPaddingRelative(int, int, int, int)} or thru * @attr ref android.R.styleable#View_paddingStart or * @attr ref android.R.styleable#View_paddingEnd * * @return true if the padding is relative or false if it is not. */ public boolean isPaddingRelative() { return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); } Insets computeOpticalInsets() { return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); } /** * @hide */ public void resetPaddingToInitialValues() { if (isRtlCompatibilityMode()) { mPaddingLeft = mUserPaddingLeftInitial; mPaddingRight = mUserPaddingRightInitial; return; } if (isLayoutRtl()) { mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; } else { mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; } } /** * @hide */ public Insets getOpticalInsets() { if (mLayoutInsets == null) { mLayoutInsets = computeOpticalInsets(); } return mLayoutInsets; } /** * Changes the selection state of this view. A view can be selected or not. * Note that selection is not the same as focus. Views are typically * selected in the context of an AdapterView like ListView or GridView; * the selected view is the view that is highlighted. * * @param selected true if the view must be selected, false otherwise */ public void setSelected(boolean selected) { //noinspection DoubleNegation if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); if (!selected) resetPressedState(); invalidate(true); refreshDrawableState(); dispatchSetSelected(selected); notifyViewAccessibilityStateChangedIfNeeded( AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); } } /** * Dispatch setSelected to all of this View's children. * * @see #setSelected(boolean) * * @param selected The new selected state */ protected void dispatchSetSelected(boolean selected) { } /** * Indicates the selection state of this view. * * @return true if the view is selected, false otherwise */ @ViewDebug.ExportedProperty public boolean isSelected() { return (mPrivateFlags & PFLAG_SELECTED) != 0; } /** * Changes the activated state of this view. A view can be activated or not. * Note that activation is not the same as selection. Selection is * a transient property, representing the view (hierarchy) the user is * currently interacting with. Activation is a longer-term state that the * user can move views in and out of. For example, in a list view with * single or multiple selection enabled, the views in the current selection * set are activated. (Um, yeah, we are deeply sorry about the terminology * here.) The activated state is propagated down to children of the view it * is set on. * * @param activated true if the view must be activated, false otherwise */ public void setActivated(boolean activated) { //noinspection DoubleNegation if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); invalidate(true); refreshDrawableState(); dispatchSetActivated(activated); } } /** * Dispatch setActivated to all of this View's children. * * @see #setActivated(boolean) * * @param activated The new activated state */ protected void dispatchSetActivated(boolean activated) { } /** * Indicates the activation state of this view. * * @return true if the view is activated, false otherwise */ @ViewDebug.ExportedProperty public boolean isActivated() { return (mPrivateFlags & PFLAG_ACTIVATED) != 0; } /** * Returns the ViewTreeObserver for this view's hierarchy. The view tree * observer can be used to get notifications when global events, like * layout, happen. * * The returned ViewTreeObserver observer is not guaranteed to remain * valid for the lifetime of this View. If the caller of this method keeps * a long-lived reference to ViewTreeObserver, it should always check for * the return value of {@link ViewTreeObserver#isAlive()}. * * @return The ViewTreeObserver for this view's hierarchy. */ public ViewTreeObserver getViewTreeObserver() { if (mAttachInfo != null) { return mAttachInfo.mTreeObserver; } if (mFloatingTreeObserver == null) { mFloatingTreeObserver = new ViewTreeObserver(); } return mFloatingTreeObserver; } /** *

Finds the topmost view in the current view hierarchy.

* * @return the topmost view containing this view */ public View getRootView() { if (mAttachInfo != null) { final View v = mAttachInfo.mRootView; if (v != null) { return v; } } View parent = this; while (parent.mParent != null && parent.mParent instanceof View) { parent = (View) parent.mParent; } return parent; } /** * Transforms a motion event from view-local coordinates to on-screen * coordinates. * * @param ev the view-local motion event * @return false if the transformation could not be applied * @hide */ public boolean toGlobalMotionEvent(MotionEvent ev) { final AttachInfo info = mAttachInfo; if (info == null) { return false; } transformMotionEventToGlobal(ev); ev.offsetLocation(info.mWindowLeft, info.mWindowTop); return true; } /** * Transforms a motion event from on-screen coordinates to view-local * coordinates. * * @param ev the on-screen motion event * @return false if the transformation could not be applied * @hide */ public boolean toLocalMotionEvent(MotionEvent ev) { final AttachInfo info = mAttachInfo; if (info == null) { return false; } ev.offsetLocation(-info.mWindowLeft, -info.mWindowTop); transformMotionEventToLocal(ev); return true; } /** * Recursive helper method that applies transformations in post-order. * * @param ev the on-screen motion event */ private void transformMotionEventToLocal(MotionEvent ev) { final ViewParent parent = mParent; if (parent instanceof View) { final View vp = (View) parent; vp.transformMotionEventToLocal(ev); ev.offsetLocation(vp.mScrollX, vp.mScrollY); } else if (parent instanceof ViewRootImpl) { final ViewRootImpl vr = (ViewRootImpl) parent; ev.offsetLocation(0, vr.mCurScrollY); } ev.offsetLocation(-mLeft, -mTop); if (!hasIdentityMatrix()) { ev.transform(getInverseMatrix()); } } /** * Recursive helper method that applies transformations in pre-order. * * @param ev the on-screen motion event */ private void transformMotionEventToGlobal(MotionEvent ev) { if (!hasIdentityMatrix()) { ev.transform(getMatrix()); } ev.offsetLocation(mLeft, mTop); final ViewParent parent = mParent; if (parent instanceof View) { final View vp = (View) parent; ev.offsetLocation(-vp.mScrollX, -vp.mScrollY); vp.transformMotionEventToGlobal(ev); } else if (parent instanceof ViewRootImpl) { final ViewRootImpl vr = (ViewRootImpl) parent; ev.offsetLocation(0, -vr.mCurScrollY); } } /** *

Computes the coordinates of this view on the screen. The argument * must be an array of two integers. After the method returns, the array * contains the x and y location in that order.

* * @param location an array of two integers in which to hold the coordinates */ public void getLocationOnScreen(int[] location) { getLocationInWindow(location); final AttachInfo info = mAttachInfo; if (info != null) { location[0] += info.mWindowLeft; location[1] += info.mWindowTop; } } /** *

Computes the coordinates of this view in its window. The argument * must be an array of two integers. After the method returns, the array * contains the x and y location in that order.

* * @param location an array of two integers in which to hold the coordinates */ public void getLocationInWindow(int[] location) { if (location == null || location.length < 2) { throw new IllegalArgumentException("location must be an array of two integers"); } if (mAttachInfo == null) { // When the view is not attached to a window, this method does not make sense location[0] = location[1] = 0; return; } float[] position = mAttachInfo.mTmpTransformLocation; position[0] = position[1] = 0.0f; if (!hasIdentityMatrix()) { getMatrix().mapPoints(position); } position[0] += mLeft; position[1] += mTop; ViewParent viewParent = mParent; while (viewParent instanceof View) { final View view = (View) viewParent; position[0] -= view.mScrollX; position[1] -= view.mScrollY; if (!view.hasIdentityMatrix()) { view.getMatrix().mapPoints(position); } position[0] += view.mLeft; position[1] += view.mTop; viewParent = view.mParent; } if (viewParent instanceof ViewRootImpl) { // *cough* final ViewRootImpl vr = (ViewRootImpl) viewParent; position[1] -= vr.mCurScrollY; } location[0] = (int) (position[0] + 0.5f); location[1] = (int) (position[1] + 0.5f); } /** * {@hide} * @param id the id of the view to be found * @return the view of the specified id, null if cannot be found */ protected View findViewTraversal(int id) { if (id == mID) { return this; } return null; } /** * {@hide} * @param tag the tag of the view to be found * @return the view of specified tag, null if cannot be found */ protected View findViewWithTagTraversal(Object tag) { if (tag != null && tag.equals(mTag)) { return this; } return null; } /** * {@hide} * @param predicate The predicate to evaluate. * @param childToSkip If not null, ignores this child during the recursive traversal. * @return The first view that matches the predicate or null. */ protected View findViewByPredicateTraversal(Predicate predicate, View childToSkip) { if (predicate.apply(this)) { return this; } return null; } /** * Look for a child view with the given id. If this view has the given * id, return this view. * * @param id The id to search for. * @return The view that has the given id in the hierarchy or null */ public final View findViewById(int id) { if (id < 0) { return null; } return findViewTraversal(id); } /** * Finds a view by its unuque and stable accessibility id. * * @param accessibilityId The searched accessibility id. * @return The found view. */ final View findViewByAccessibilityId(int accessibilityId) { if (accessibilityId < 0) { return null; } return findViewByAccessibilityIdTraversal(accessibilityId); } /** * Performs the traversal to find a view by its unuque and stable accessibility id. * * Note:This method does not stop at the root namespace * boundary since the user can touch the screen at an arbitrary location * potentially crossing the root namespace bounday which will send an * accessibility event to accessibility services and they should be able * to obtain the event source. Also accessibility ids are guaranteed to be * unique in the window. * * @param accessibilityId The accessibility id. * @return The found view. * * @hide */ public View findViewByAccessibilityIdTraversal(int accessibilityId) { if (getAccessibilityViewId() == accessibilityId) { return this; } return null; } /** * Look for a child view with the given tag. If this view has the given * tag, return this view. * * @param tag The tag to search for, using "tag.equals(getTag())". * @return The View that has the given tag in the hierarchy or null */ public final View findViewWithTag(Object tag) { if (tag == null) { return null; } return findViewWithTagTraversal(tag); } /** * {@hide} * Look for a child view that matches the specified predicate. * If this view matches the predicate, return this view. * * @param predicate The predicate to evaluate. * @return The first view that matches the predicate or null. */ public final View findViewByPredicate(Predicate predicate) { return findViewByPredicateTraversal(predicate, null); } /** * {@hide} * Look for a child view that matches the specified predicate, * starting with the specified view and its descendents and then * recusively searching the ancestors and siblings of that view * until this view is reached. * * This method is useful in cases where the predicate does not match * a single unique view (perhaps multiple views use the same id) * and we are trying to find the view that is "closest" in scope to the * starting view. * * @param start The view to start from. * @param predicate The predicate to evaluate. * @return The first view that matches the predicate or null. */ public final View findViewByPredicateInsideOut(View start, Predicate predicate) { View childToSkip = null; for (;;) { View view = start.findViewByPredicateTraversal(predicate, childToSkip); if (view != null || start == this) { return view; } ViewParent parent = start.getParent(); if (parent == null || !(parent instanceof View)) { return null; } childToSkip = start; start = (View) parent; } } /** * Sets the identifier for this view. The identifier does not have to be * unique in this view's hierarchy. The identifier should be a positive * number. * * @see #NO_ID * @see #getId() * @see #findViewById(int) * * @param id a number used to identify the view * * @attr ref android.R.styleable#View_id */ public void setId(int id) { mID = id; if (mID == View.NO_ID && mLabelForId != View.NO_ID) { mID = generateViewId(); } } /** * {@hide} * * @param isRoot true if the view belongs to the root namespace, false * otherwise */ public void setIsRootNamespace(boolean isRoot) { if (isRoot) { mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; } else { mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; } } /** * {@hide} * * @return true if the view belongs to the root namespace, false otherwise */ public boolean isRootNamespace() { return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; } /** * Returns this view's identifier. * * @return a positive integer used to identify the view or {@link #NO_ID} * if the view has no ID * * @see #setId(int) * @see #findViewById(int) * @attr ref android.R.styleable#View_id */ @ViewDebug.CapturedViewProperty public int getId() { return mID; } /** * Returns this view's tag. * * @return the Object stored in this view as a tag * * @see #setTag(Object) * @see #getTag(int) */ @ViewDebug.ExportedProperty public Object getTag() { return mTag; } /** * Sets the tag associated with this view. A tag can be used to mark * a view in its hierarchy and does not have to be unique within the * hierarchy. Tags can also be used to store data within a view without * resorting to another data structure. * * @param tag an Object to tag the view with * * @see #getTag() * @see #setTag(int, Object) */ public void setTag(final Object tag) { mTag = tag; } /** * Returns the tag associated with this view and the specified key. * * @param key The key identifying the tag * * @return the Object stored in this view as a tag * * @see #setTag(int, Object) * @see #getTag() */ public Object getTag(int key) { if (mKeyedTags != null) return mKeyedTags.get(key); return null; } /** * Sets a tag associated with this view and a key. A tag can be used * to mark a view in its hierarchy and does not have to be unique within * the hierarchy. Tags can also be used to store data within a view * without resorting to another data structure. * * The specified key should be an id declared in the resources of the * application to ensure it is unique (see the ID resource type). * Keys identified as belonging to * the Android framework or not associated with any package will cause * an {@link IllegalArgumentException} to be thrown. * * @param key The key identifying the tag * @param tag An Object to tag the view with * * @throws IllegalArgumentException If they specified key is not valid * * @see #setTag(Object) * @see #getTag(int) */ public void setTag(int key, final Object tag) { // If the package id is 0x00 or 0x01, it's either an undefined package // or a framework id if ((key >>> 24) < 2) { throw new IllegalArgumentException("The key must be an application-specific " + "resource id."); } setKeyedTag(key, tag); } /** * Variation of {@link #setTag(int, Object)} that enforces the key to be a * framework id. * * @hide */ public void setTagInternal(int key, Object tag) { if ((key >>> 24) != 0x1) { throw new IllegalArgumentException("The key must be a framework-specific " + "resource id."); } setKeyedTag(key, tag); } private void setKeyedTag(int key, Object tag) { if (mKeyedTags == null) { mKeyedTags = new SparseArray(2); } mKeyedTags.put(key, tag); } /** * Prints information about this view in the log output, with the tag * {@link #VIEW_LOG_TAG}. * * @hide */ public void debug() { debug(0); } /** * Prints information about this view in the log output, with the tag * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an * indentation defined by the depth. * * @param depth the indentation level * * @hide */ protected void debug(int depth) { String output = debugIndent(depth - 1); output += "+ " + this; int id = getId(); if (id != -1) { output += " (id=" + id + ")"; } Object tag = getTag(); if (tag != null) { output += " (tag=" + tag + ")"; } Log.d(VIEW_LOG_TAG, output); if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { output = debugIndent(depth) + " FOCUSED"; Log.d(VIEW_LOG_TAG, output); } output = debugIndent(depth); output += "frame={" + mLeft + ", " + mTop + ", " + mRight + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY + "} "; Log.d(VIEW_LOG_TAG, output); if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 || mPaddingBottom != 0) { output = debugIndent(depth); output += "padding={" + mPaddingLeft + ", " + mPaddingTop + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; Log.d(VIEW_LOG_TAG, output); } output = debugIndent(depth); output += "mMeasureWidth=" + mMeasuredWidth + " mMeasureHeight=" + mMeasuredHeight; Log.d(VIEW_LOG_TAG, output); output = debugIndent(depth); if (mLayoutParams == null) { output += "BAD! no layout params"; } else { output = mLayoutParams.debug(output); } Log.d(VIEW_LOG_TAG, output); output = debugIndent(depth); output += "flags={"; output += View.printFlags(mViewFlags); output += "}"; Log.d(VIEW_LOG_TAG, output); output = debugIndent(depth); output += "privateFlags={"; output += View.printPrivateFlags(mPrivateFlags); output += "}"; Log.d(VIEW_LOG_TAG, output); } /** * Creates a string of whitespaces used for indentation. * * @param depth the indentation level * @return a String containing (depth * 2 + 3) * 2 white spaces * * @hide */ protected static String debugIndent(int depth) { StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); for (int i = 0; i < (depth * 2) + 3; i++) { spaces.append(' ').append(' '); } return spaces.toString(); } /** *

Return the offset of the widget's text baseline from the widget's top * boundary. If this widget does not support baseline alignment, this * method returns -1.

* * @return the offset of the baseline within the widget's bounds or -1 * if baseline alignment is not supported */ @ViewDebug.ExportedProperty(category = "layout") public int getBaseline() { return -1; } /** * Returns whether the view hierarchy is currently undergoing a layout pass. This * information is useful to avoid situations such as calling {@link #requestLayout()} during * a layout pass. * * @return whether the view hierarchy is currently undergoing a layout pass */ public boolean isInLayout() { ViewRootImpl viewRoot = getViewRootImpl(); return (viewRoot != null && viewRoot.isInLayout()); } /** * Call this when something has changed which has invalidated the * layout of this view. This will schedule a layout pass of the view * tree. This should not be called while the view hierarchy is currently in a layout * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the * end of the current layout pass (and then layout will run again) or after the current * frame is drawn and the next layout occurs. * *

Subclasses which override this method should call the superclass method to * handle possible request-during-layout errors correctly.

*/ public void requestLayout() { if (mMeasureCache != null) mMeasureCache.clear(); if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { // Only trigger request-during-layout logic if this is the view requesting it, // not the views in its parent hierarchy ViewRootImpl viewRoot = getViewRootImpl(); if (viewRoot != null && viewRoot.isInLayout()) { if (!viewRoot.requestLayoutDuringLayout(this)) { return; } } mAttachInfo.mViewRequestingLayout = this; } mPrivateFlags |= PFLAG_FORCE_LAYOUT; mPrivateFlags |= PFLAG_INVALIDATED; if (mParent != null && !mParent.isLayoutRequested()) { mParent.requestLayout(); } if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { mAttachInfo.mViewRequestingLayout = null; } } /** * Forces this view to be laid out during the next layout pass. * This method does not call requestLayout() or forceLayout() * on the parent. */ public void forceLayout() { if (mMeasureCache != null) mMeasureCache.clear(); mPrivateFlags |= PFLAG_FORCE_LAYOUT; mPrivateFlags |= PFLAG_INVALIDATED; } /** *

* This is called to find out how big a view should be. The parent * supplies constraint information in the width and height parameters. *

* *

* The actual measurement work of a view is performed in * {@link #onMeasure(int, int)}, called by this method. Therefore, only * {@link #onMeasure(int, int)} can and must be overridden by subclasses. *

* * * @param widthMeasureSpec Horizontal space requirements as imposed by the * parent * @param heightMeasureSpec Vertical space requirements as imposed by the * parent * * @see #onMeasure(int, int) */ public final void measure(int widthMeasureSpec, int heightMeasureSpec) { boolean optical = isLayoutModeOptical(this); if (optical != isLayoutModeOptical(mParent)) { Insets insets = getOpticalInsets(); int oWidth = insets.left + insets.right; int oHeight = insets.top + insets.bottom; widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); } // Suppress sign extension for the low bytes long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL; if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2); if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || widthMeasureSpec != mOldWidthMeasureSpec || heightMeasureSpec != mOldHeightMeasureSpec) { // first clears the measured dimension flag mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; resolveRtlPropertiesIfNeeded(); int cacheIndex = (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT ? -1 : mMeasureCache.indexOfKey(key); if (cacheIndex < 0 || sIgnoreMeasureCache) { // measure ourselves, this should set the measured dimension flag back onMeasure(widthMeasureSpec, heightMeasureSpec); mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; } else { long value = mMeasureCache.valueAt(cacheIndex); // Casting a long to int drops the high 32 bits, no mask needed setMeasuredDimension((int) (value >> 32), (int) value); mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; } // flag not set, setMeasuredDimension() was not invoked, we raise // an exception to warn the developer if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { throw new IllegalStateException("onMeasure() did not set the" + " measured dimension by calling" + " setMeasuredDimension()"); } mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; } mOldWidthMeasureSpec = widthMeasureSpec; mOldHeightMeasureSpec = heightMeasureSpec; mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 | (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension } /** *

* Measure the view and its content to determine the measured width and the * measured height. This method is invoked by {@link #measure(int, int)} and * should be overriden by subclasses to provide accurate and efficient * measurement of their contents. *

* *

* CONTRACT: When overriding this method, you * must call {@link #setMeasuredDimension(int, int)} to store the * measured width and height of this view. Failure to do so will trigger an * IllegalStateException, thrown by * {@link #measure(int, int)}. Calling the superclass' * {@link #onMeasure(int, int)} is a valid use. *

* *

* The base class implementation of measure defaults to the background size, * unless a larger size is allowed by the MeasureSpec. Subclasses should * override {@link #onMeasure(int, int)} to provide better measurements of * their content. *

* *

* If this method is overridden, it is the subclass's responsibility to make * sure the measured height and width are at least the view's minimum height * and width ({@link #getSuggestedMinimumHeight()} and * {@link #getSuggestedMinimumWidth()}). *

* * @param widthMeasureSpec horizontal space requirements as imposed by the parent. * The requirements are encoded with * {@link android.view.View.MeasureSpec}. * @param heightMeasureSpec vertical space requirements as imposed by the parent. * The requirements are encoded with * {@link android.view.View.MeasureSpec}. * * @see #getMeasuredWidth() * @see #getMeasuredHeight() * @see #setMeasuredDimension(int, int) * @see #getSuggestedMinimumHeight() * @see #getSuggestedMinimumWidth() * @see android.view.View.MeasureSpec#getMode(int) * @see android.view.View.MeasureSpec#getSize(int) */ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); } /** *

This method must be called by {@link #onMeasure(int, int)} to store the * measured width and measured height. Failing to do so will trigger an * exception at measurement time.

* * @param measuredWidth The measured width of this view. May be a complex * bit mask as defined by {@link #MEASURED_SIZE_MASK} and * {@link #MEASURED_STATE_TOO_SMALL}. * @param measuredHeight The measured height of this view. May be a complex * bit mask as defined by {@link #MEASURED_SIZE_MASK} and * {@link #MEASURED_STATE_TOO_SMALL}. */ protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { boolean optical = isLayoutModeOptical(this); if (optical != isLayoutModeOptical(mParent)) { Insets insets = getOpticalInsets(); int opticalWidth = insets.left + insets.right; int opticalHeight = insets.top + insets.bottom; measuredWidth += optical ? opticalWidth : -opticalWidth; measuredHeight += optical ? opticalHeight : -opticalHeight; } mMeasuredWidth = measuredWidth; mMeasuredHeight = measuredHeight; mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; } /** * Merge two states as returned by {@link #getMeasuredState()}. * @param curState The current state as returned from a view or the result * of combining multiple views. * @param newState The new view state to combine. * @return Returns a new integer reflecting the combination of the two * states. */ public static int combineMeasuredStates(int curState, int newState) { return curState | newState; } /** * Version of {@link #resolveSizeAndState(int, int, int)} * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. */ public static int resolveSize(int size, int measureSpec) { return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; } /** * Utility to reconcile a desired size and state, with constraints imposed * by a MeasureSpec. Will take the desired size, unless a different size * is imposed by the constraints. The returned value is a compound integer, * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting * size is smaller than the size the view wants to be. * * @param size How big the view wants to be * @param measureSpec Constraints imposed by the parent * @return Size information bit mask as defined by * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. */ public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { int result = size; int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); switch (specMode) { case MeasureSpec.UNSPECIFIED: result = size; break; case MeasureSpec.AT_MOST: if (specSize < size) { result = specSize | MEASURED_STATE_TOO_SMALL; } else { result = size; } break; case MeasureSpec.EXACTLY: result = specSize; break; } return result | (childMeasuredState&MEASURED_STATE_MASK); } /** * Utility to return a default size. Uses the supplied size if the * MeasureSpec imposed no constraints. Will get larger if allowed * by the MeasureSpec. * * @param size Default size for this view * @param measureSpec Constraints imposed by the parent * @return The size this view should be. */ public static int getDefaultSize(int size, int measureSpec) { int result = size; int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); switch (specMode) { case MeasureSpec.UNSPECIFIED: result = size; break; case MeasureSpec.AT_MOST: case MeasureSpec.EXACTLY: result = specSize; break; } return result; } /** * Returns the suggested minimum height that the view should use. This * returns the maximum of the view's minimum height * and the background's minimum height * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). *

* When being used in {@link #onMeasure(int, int)}, the caller should still * ensure the returned height is within the requirements of the parent. * * @return The suggested minimum height of the view. */ protected int getSuggestedMinimumHeight() { return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); } /** * Returns the suggested minimum width that the view should use. This * returns the maximum of the view's minimum width) * and the background's minimum width * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). *

* When being used in {@link #onMeasure(int, int)}, the caller should still * ensure the returned width is within the requirements of the parent. * * @return The suggested minimum width of the view. */ protected int getSuggestedMinimumWidth() { return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); } /** * Returns the minimum height of the view. * * @return the minimum height the view will try to be. * * @see #setMinimumHeight(int) * * @attr ref android.R.styleable#View_minHeight */ public int getMinimumHeight() { return mMinHeight; } /** * Sets the minimum height of the view. It is not guaranteed the view will * be able to achieve this minimum height (for example, if its parent layout * constrains it with less available height). * * @param minHeight The minimum height the view will try to be. * * @see #getMinimumHeight() * * @attr ref android.R.styleable#View_minHeight */ public void setMinimumHeight(int minHeight) { mMinHeight = minHeight; requestLayout(); } /** * Returns the minimum width of the view. * * @return the minimum width the view will try to be. * * @see #setMinimumWidth(int) * * @attr ref android.R.styleable#View_minWidth */ public int getMinimumWidth() { return mMinWidth; } /** * Sets the minimum width of the view. It is not guaranteed the view will * be able to achieve this minimum width (for example, if its parent layout * constrains it with less available width). * * @param minWidth The minimum width the view will try to be. * * @see #getMinimumWidth() * * @attr ref android.R.styleable#View_minWidth */ public void setMinimumWidth(int minWidth) { mMinWidth = minWidth; requestLayout(); } /** * Get the animation currently associated with this view. * * @return The animation that is currently playing or * scheduled to play for this view. */ public Animation getAnimation() { return mCurrentAnimation; } /** * Start the specified animation now. * * @param animation the animation to start now */ public void startAnimation(Animation animation) { animation.setStartTime(Animation.START_ON_FIRST_FRAME); setAnimation(animation); invalidateParentCaches(); invalidate(true); } /** * Cancels any animations for this view. */ public void clearAnimation() { if (mCurrentAnimation != null) { mCurrentAnimation.detach(); } mCurrentAnimation = null; invalidateParentIfNeeded(); } /** * Sets the next animation to play for this view. * If you want the animation to play immediately, use * {@link #startAnimation(android.view.animation.Animation)} instead. * This method provides allows fine-grained * control over the start time and invalidation, but you * must make sure that 1) the animation has a start time set, and * 2) the view's parent (which controls animations on its children) * will be invalidated when the animation is supposed to * start. * * @param animation The next animation, or null. */ public void setAnimation(Animation animation) { mCurrentAnimation = animation; if (animation != null) { // If the screen is off assume the animation start time is now instead of // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time // would cause the animation to start when the screen turns back on if (mAttachInfo != null && !mAttachInfo.mScreenOn && animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); } animation.reset(); } } /** * Invoked by a parent ViewGroup to notify the start of the animation * currently associated with this view. If you override this method, * always call super.onAnimationStart(); * * @see #setAnimation(android.view.animation.Animation) * @see #getAnimation() */ protected void onAnimationStart() { mPrivateFlags |= PFLAG_ANIMATION_STARTED; } /** * Invoked by a parent ViewGroup to notify the end of the animation * currently associated with this view. If you override this method, * always call super.onAnimationEnd(); * * @see #setAnimation(android.view.animation.Animation) * @see #getAnimation() */ protected void onAnimationEnd() { mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; } /** * Invoked if there is a Transform that involves alpha. Subclass that can * draw themselves with the specified alpha should return true, and then * respect that alpha when their onDraw() is called. If this returns false * then the view may be redirected to draw into an offscreen buffer to * fulfill the request, which will look fine, but may be slower than if the * subclass handles it internally. The default implementation returns false. * * @param alpha The alpha (0..255) to apply to the view's drawing * @return true if the view can draw with the specified alpha. */ protected boolean onSetAlpha(int alpha) { return false; } /** * This is used by the RootView to perform an optimization when * the view hierarchy contains one or several SurfaceView. * SurfaceView is always considered transparent, but its children are not, * therefore all View objects remove themselves from the global transparent * region (passed as a parameter to this function). * * @param region The transparent region for this ViewAncestor (window). * * @return Returns true if the effective visibility of the view at this * point is opaque, regardless of the transparent region; returns false * if it is possible for underlying windows to be seen behind the view. * * {@hide} */ public boolean gatherTransparentRegion(Region region) { final AttachInfo attachInfo = mAttachInfo; if (region != null && attachInfo != null) { final int pflags = mPrivateFlags; if ((pflags & PFLAG_SKIP_DRAW) == 0) { // The SKIP_DRAW flag IS NOT set, so this view draws. We need to // remove it from the transparent region. final int[] location = attachInfo.mTransparentLocation; getLocationInWindow(location); region.op(location[0], location[1], location[0] + mRight - mLeft, location[1] + mBottom - mTop, Region.Op.DIFFERENCE); } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable // exists, so we remove the background drawable's non-transparent // parts from this transparent region. applyDrawableToTransparentRegion(mBackground, region); } } return true; } /** * Play a sound effect for this view. * *

The framework will play sound effects for some built in actions, such as * clicking, but you may wish to play these effects in your widget, * for instance, for internal navigation. * *

The sound effect will only be played if sound effects are enabled by the user, and * {@link #isSoundEffectsEnabled()} is true. * * @param soundConstant One of the constants defined in {@link SoundEffectConstants} */ public void playSoundEffect(int soundConstant) { if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { return; } mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); } /** * BZZZTT!!1! * *

Provide haptic feedback to the user for this view. * *

The framework will provide haptic feedback for some built in actions, * such as long presses, but you may wish to provide feedback for your * own widget. * *

The feedback will only be performed if * {@link #isHapticFeedbackEnabled()} is true. * * @param feedbackConstant One of the constants defined in * {@link HapticFeedbackConstants} */ public boolean performHapticFeedback(int feedbackConstant) { return performHapticFeedback(feedbackConstant, 0); } /** * BZZZTT!!1! * *

Like {@link #performHapticFeedback(int)}, with additional options. * * @param feedbackConstant One of the constants defined in * {@link HapticFeedbackConstants} * @param flags Additional flags as per {@link HapticFeedbackConstants}. */ public boolean performHapticFeedback(int feedbackConstant, int flags) { if (mAttachInfo == null) { return false; } //noinspection SimplifiableIfStatement if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 && !isHapticFeedbackEnabled()) { return false; } return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); } /** * Request that the visibility of the status bar or other screen/window * decorations be changed. * *

This method is used to put the over device UI into temporary modes * where the user's attention is focused more on the application content, * by dimming or hiding surrounding system affordances. This is typically * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content * to be placed behind the action bar (and with these flags other system * affordances) so that smooth transitions between hiding and showing them * can be done. * *

Two representative examples of the use of system UI visibility is * implementing a content browsing application (like a magazine reader) * and a video playing application. * *

The first code shows a typical implementation of a View in a content * browsing application. In this implementation, the application goes * into a content-oriented mode by hiding the status bar and action bar, * and putting the navigation elements into lights out mode. The user can * then interact with content while in this mode. Such an application should * provide an easy way for the user to toggle out of the mode (such as to * check information in the status bar or access notifications). In the * implementation here, this is done simply by tapping on the content. * * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java * content} * *

This second code sample shows a typical implementation of a View * in a video playing application. In this situation, while the video is * playing the application would like to go into a complete full-screen mode, * to use as much of the display as possible for the video. When in this state * the user can not interact with the application; the system intercepts * touching on the screen to pop the UI out of full screen mode. See * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. * * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java * content} * * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE}, * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}. */ public void setSystemUiVisibility(int visibility) { if (visibility != mSystemUiVisibility) { mSystemUiVisibility = visibility; if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { mParent.recomputeViewAttributes(this); } } } /** * Returns the last {@link #setSystemUiVisibility(int)} that this view has requested. * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE}, * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}. */ public int getSystemUiVisibility() { return mSystemUiVisibility; } /** * Returns the current system UI visibility that is currently set for * the entire window. This is the combination of the * {@link #setSystemUiVisibility(int)} values supplied by all of the * views in the window. */ public int getWindowSystemUiVisibility() { return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; } /** * Override to find out when the window's requested system UI visibility * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. * This is different from the callbacks received through * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} * in that this is only telling you about the local request of the window, * not the actual values applied by the system. */ public void onWindowSystemUiVisibilityChanged(int visible) { } /** * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down * the view hierarchy. */ public void dispatchWindowSystemUiVisiblityChanged(int visible) { onWindowSystemUiVisibilityChanged(visible); } /** * Set a listener to receive callbacks when the visibility of the system bar changes. * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. */ public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { getListenerInfo().mOnSystemUiVisibilityChangeListener = l; if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { mParent.recomputeViewAttributes(this); } } /** * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down * the view hierarchy. */ public void dispatchSystemUiVisibilityChanged(int visibility) { ListenerInfo li = mListenerInfo; if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); } } boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); if (val != mSystemUiVisibility) { setSystemUiVisibility(val); return true; } return false; } /** @hide */ public void setDisabledSystemUiVisibility(int flags) { if (mAttachInfo != null) { if (mAttachInfo.mDisabledSystemUiVisibility != flags) { mAttachInfo.mDisabledSystemUiVisibility = flags; if (mParent != null) { mParent.recomputeViewAttributes(this); } } } } /** * Creates an image that the system displays during the drag and drop * operation. This is called a "drag shadow". The default implementation * for a DragShadowBuilder based on a View returns an image that has exactly the same * appearance as the given View. The default also positions the center of the drag shadow * directly under the touch point. If no View is provided (the constructor with no parameters * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the * default is an invisible drag shadow. *

* You are not required to use the View you provide to the constructor as the basis of the * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw * anything you want as the drag shadow. *

*

* You pass a DragShadowBuilder object to the system when you start the drag. The system * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the * size and position of the drag shadow. It uses this data to construct a * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} * so that your application can draw the shadow image in the Canvas. *

* *
*

Developer Guides

*

For a guide to implementing drag and drop features, read the * Drag and Drop developer guide.

*
*/ public static class DragShadowBuilder { private final WeakReference mView; /** * Constructs a shadow image builder based on a View. By default, the resulting drag * shadow will have the same appearance and dimensions as the View, with the touch point * over the center of the View. * @param view A View. Any View in scope can be used. */ public DragShadowBuilder(View view) { mView = new WeakReference(view); } /** * Construct a shadow builder object with no associated View. This * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} * and {@link #onDrawShadow(Canvas)} methods are also overridden in order * to supply the drag shadow's dimensions and appearance without * reference to any View object. If they are not overridden, then the result is an * invisible drag shadow. */ public DragShadowBuilder() { mView = new WeakReference(null); } /** * Returns the View object that had been passed to the * {@link #View.DragShadowBuilder(View)} * constructor. If that View parameter was {@code null} or if the * {@link #View.DragShadowBuilder()} * constructor was used to instantiate the builder object, this method will return * null. * * @return The View object associate with this builder object. */ @SuppressWarnings({"JavadocReference"}) final public View getView() { return mView.get(); } /** * Provides the metrics for the shadow image. These include the dimensions of * the shadow image, and the point within that shadow that should * be centered under the touch location while dragging. *

* The default implementation sets the dimensions of the shadow to be the * same as the dimensions of the View itself and centers the shadow under * the touch point. *

* * @param shadowSize A {@link android.graphics.Point} containing the width and height * of the shadow image. Your application must set {@link android.graphics.Point#x} to the * desired width and must set {@link android.graphics.Point#y} to the desired height of the * image. * * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the * shadow image that should be underneath the touch point during the drag and drop * operation. Your application must set {@link android.graphics.Point#x} to the * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. */ public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { final View view = mView.get(); if (view != null) { shadowSize.set(view.getWidth(), view.getHeight()); shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); } else { Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); } } /** * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object * based on the dimensions it received from the * {@link #onProvideShadowMetrics(Point, Point)} callback. * * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. */ public void onDrawShadow(Canvas canvas) { final View view = mView.get(); if (view != null) { view.draw(canvas); } else { Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); } } } /** * Starts a drag and drop operation. When your application calls this method, it passes a * {@link android.view.View.DragShadowBuilder} object to the system. The * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} * to get metrics for the drag shadow, and then calls the object's * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. *

* Once the system has the drag shadow, it begins the drag and drop operation by sending * drag events to all the View objects in your application that are currently visible. It does * this either by calling the View object's drag listener (an implementation of * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. * Both are passed a {@link android.view.DragEvent} object that has a * {@link android.view.DragEvent#getAction()} value of * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. *

*

* Your application can invoke startDrag() on any attached View object. The View object does not * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to * be related to the View the user selected for dragging. *

* @param data A {@link android.content.ClipData} object pointing to the data to be * transferred by the drag and drop operation. * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the * drag shadow. * @param myLocalState An {@link java.lang.Object} containing local data about the drag and * drop operation. This Object is put into every DragEvent object sent by the system during the * current drag. *

* myLocalState is a lightweight mechanism for the sending information from the dragged View * to the target Views. For example, it can contain flags that differentiate between a * a copy operation and a move operation. *

* @param flags Flags that control the drag and drop operation. No flags are currently defined, * so the parameter should be set to 0. * @return {@code true} if the method completes successfully, or * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to * do a drag, and so no drag operation is in progress. */ public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, Object myLocalState, int flags) { if (ViewDebug.DEBUG_DRAG) { Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); } boolean okay = false; Point shadowSize = new Point(); Point shadowTouchPoint = new Point(); shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); if ((shadowSize.x < 0) || (shadowSize.y < 0) || (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { throw new IllegalStateException("Drag shadow dimensions must not be negative"); } if (ViewDebug.DEBUG_DRAG) { Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); } Surface surface = new Surface(); try { IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, flags, shadowSize.x, shadowSize.y, surface); if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token + " surface=" + surface); if (token != null) { Canvas canvas = surface.lockCanvas(null); try { canvas.drawColor(0, PorterDuff.Mode.CLEAR); shadowBuilder.onDrawShadow(canvas); } finally { surface.unlockCanvasAndPost(canvas); } final ViewRootImpl root = getViewRootImpl(); // Cache the local state object for delivery with DragEvents root.setLocalDragState(myLocalState); // repurpose 'shadowSize' for the last touch point root.getLastTouchPoint(shadowSize); okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, shadowSize.x, shadowSize.y, shadowTouchPoint.x, shadowTouchPoint.y, data); if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); // Off and running! Release our local surface instance; the drag // shadow surface is now managed by the system process. surface.release(); } } catch (Exception e) { Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); surface.destroy(); } return okay; } /** * Handles drag events sent by the system following a call to * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. *

* When the system calls this method, it passes a * {@link android.view.DragEvent} object. A call to * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined * in DragEvent. The method uses these to determine what is happening in the drag and drop * operation. * @param event The {@link android.view.DragEvent} sent by the system. * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined * in DragEvent, indicating the type of drag event represented by this object. * @return {@code true} if the method was successful, otherwise {@code false}. *

* The method should return {@code true} in response to an action type of * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current * operation. *

*

* The method should also return {@code true} in response to an action type of * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or * {@code false} if it didn't. *

*/ public boolean onDragEvent(DragEvent event) { return false; } /** * Detects if this View is enabled and has a drag event listener. * If both are true, then it calls the drag event listener with the * {@link android.view.DragEvent} it received. If the drag event listener returns * {@code true}, then dispatchDragEvent() returns {@code true}. *

* For all other cases, the method calls the * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler * method and returns its result. *

*

* This ensures that a drag event is always consumed, even if the View does not have a drag * event listener. However, if the View has a listener and the listener returns true, then * onDragEvent() is not called. *

*/ public boolean dispatchDragEvent(DragEvent event) { ListenerInfo li = mListenerInfo; //noinspection SimplifiableIfStatement if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && li.mOnDragListener.onDrag(this, event)) { return true; } return onDragEvent(event); } boolean canAcceptDrag() { return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; } /** * This needs to be a better API (NOT ON VIEW) before it is exposed. If * it is ever exposed at all. * @hide */ public void onCloseSystemDialogs(String reason) { } /** * Given a Drawable whose bounds have been set to draw into this view, * update a Region being computed for * {@link #gatherTransparentRegion(android.graphics.Region)} so * that any non-transparent parts of the Drawable are removed from the * given transparent region. * * @param dr The Drawable whose transparency is to be applied to the region. * @param region A Region holding the current transparency information, * where any parts of the region that are set are considered to be * transparent. On return, this region will be modified to have the * transparency information reduced by the corresponding parts of the * Drawable that are not transparent. * {@hide} */ public void applyDrawableToTransparentRegion(Drawable dr, Region region) { if (DBG) { Log.i("View", "Getting transparent region for: " + this); } final Region r = dr.getTransparentRegion(); final Rect db = dr.getBounds(); final AttachInfo attachInfo = mAttachInfo; if (r != null && attachInfo != null) { final int w = getRight()-getLeft(); final int h = getBottom()-getTop(); if (db.left > 0) { //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); r.op(0, 0, db.left, h, Region.Op.UNION); } if (db.right < w) { //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); r.op(db.right, 0, w, h, Region.Op.UNION); } if (db.top > 0) { //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); r.op(0, 0, w, db.top, Region.Op.UNION); } if (db.bottom < h) { //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); r.op(0, db.bottom, w, h, Region.Op.UNION); } final int[] location = attachInfo.mTransparentLocation; getLocationInWindow(location); r.translate(location[0], location[1]); region.op(r, Region.Op.INTERSECT); } else { region.op(db, Region.Op.DIFFERENCE); } } private void checkForLongClick(int delayOffset) { if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { mHasPerformedLongPress = false; if (mPendingCheckForLongPress == null) { mPendingCheckForLongPress = new CheckForLongPress(); } mPendingCheckForLongPress.rememberWindowAttachCount(); postDelayed(mPendingCheckForLongPress, ViewConfiguration.getLongPressTimeout() - delayOffset); } } /** * Inflate a view from an XML resource. This convenience method wraps the {@link * LayoutInflater} class, which provides a full range of options for view inflation. * * @param context The Context object for your activity or application. * @param resource The resource ID to inflate * @param root A view group that will be the parent. Used to properly inflate the * layout_* parameters. * @see LayoutInflater */ public static View inflate(Context context, int resource, ViewGroup root) { LayoutInflater factory = LayoutInflater.from(context); return factory.inflate(resource, root); } /** * Scroll the view with standard behavior for scrolling beyond the normal * content boundaries. Views that call this method should override * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the * results of an over-scroll operation. * * Views can use this method to handle any touch or fling-based scrolling. * * @param deltaX Change in X in pixels * @param deltaY Change in Y in pixels * @param scrollX Current X scroll value in pixels before applying deltaX * @param scrollY Current Y scroll value in pixels before applying deltaY * @param scrollRangeX Maximum content scroll range along the X axis * @param scrollRangeY Maximum content scroll range along the Y axis * @param maxOverScrollX Number of pixels to overscroll by in either direction * along the X axis. * @param maxOverScrollY Number of pixels to overscroll by in either direction * along the Y axis. * @param isTouchEvent true if this scroll operation is the result of a touch event. * @return true if scrolling was clamped to an over-scroll boundary along either * axis, false otherwise. */ @SuppressWarnings({"UnusedParameters"}) protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) { final int overScrollMode = mOverScrollMode; final boolean canScrollHorizontal = computeHorizontalScrollRange() > computeHorizontalScrollExtent(); final boolean canScrollVertical = computeVerticalScrollRange() > computeVerticalScrollExtent(); final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); int newScrollX = scrollX + deltaX; if (!overScrollHorizontal) { maxOverScrollX = 0; } int newScrollY = scrollY + deltaY; if (!overScrollVertical) { maxOverScrollY = 0; } // Clamp values if at the limits and record final int left = -maxOverScrollX; final int right = maxOverScrollX + scrollRangeX; final int top = -maxOverScrollY; final int bottom = maxOverScrollY + scrollRangeY; boolean clampedX = false; if (newScrollX > right) { newScrollX = right; clampedX = true; } else if (newScrollX < left) { newScrollX = left; clampedX = true; } boolean clampedY = false; if (newScrollY > bottom) { newScrollY = bottom; clampedY = true; } else if (newScrollY < top) { newScrollY = top; clampedY = true; } onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); return clampedX || clampedY; } /** * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to * respond to the results of an over-scroll operation. * * @param scrollX New X scroll value in pixels * @param scrollY New Y scroll value in pixels * @param clampedX True if scrollX was clamped to an over-scroll boundary * @param clampedY True if scrollY was clamped to an over-scroll boundary */ protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) { // Intentionally empty. } /** * Returns the over-scroll mode for this view. The result will be * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} * (allow over-scrolling only if the view content is larger than the container), * or {@link #OVER_SCROLL_NEVER}. * * @return This view's over-scroll mode. */ public int getOverScrollMode() { return mOverScrollMode; } /** * Set the over-scroll mode for this view. Valid over-scroll modes are * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} * (allow over-scrolling only if the view content is larger than the container), * or {@link #OVER_SCROLL_NEVER}. * * Setting the over-scroll mode of a view will have an effect only if the * view is capable of scrolling. * * @param overScrollMode The new over-scroll mode for this view. */ public void setOverScrollMode(int overScrollMode) { if (overScrollMode != OVER_SCROLL_ALWAYS && overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && overScrollMode != OVER_SCROLL_NEVER) { throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); } mOverScrollMode = overScrollMode; } /** * Gets a scale factor that determines the distance the view should scroll * vertically in response to {@link MotionEvent#ACTION_SCROLL}. * @return The vertical scroll scale factor. * @hide */ protected float getVerticalScrollFactor() { if (mVerticalScrollFactor == 0) { TypedValue outValue = new TypedValue(); if (!mContext.getTheme().resolveAttribute( com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { throw new IllegalStateException( "Expected theme to define listPreferredItemHeight."); } mVerticalScrollFactor = outValue.getDimension( mContext.getResources().getDisplayMetrics()); } return mVerticalScrollFactor; } /** * Gets a scale factor that determines the distance the view should scroll * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. * @return The horizontal scroll scale factor. * @hide */ protected float getHorizontalScrollFactor() { // TODO: Should use something else. return getVerticalScrollFactor(); } /** * Return the value specifying the text direction or policy that was set with * {@link #setTextDirection(int)}. * * @return the defined text direction. It can be one of: * * {@link #TEXT_DIRECTION_INHERIT}, * {@link #TEXT_DIRECTION_FIRST_STRONG} * {@link #TEXT_DIRECTION_ANY_RTL}, * {@link #TEXT_DIRECTION_LTR}, * {@link #TEXT_DIRECTION_RTL}, * {@link #TEXT_DIRECTION_LOCALE} * * @attr ref android.R.styleable#View_textDirection * * @hide */ @ViewDebug.ExportedProperty(category = "text", mapping = { @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") }) public int getRawTextDirection() { return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; } /** * Set the text direction. * * @param textDirection the direction to set. Should be one of: * * {@link #TEXT_DIRECTION_INHERIT}, * {@link #TEXT_DIRECTION_FIRST_STRONG} * {@link #TEXT_DIRECTION_ANY_RTL}, * {@link #TEXT_DIRECTION_LTR}, * {@link #TEXT_DIRECTION_RTL}, * {@link #TEXT_DIRECTION_LOCALE} * * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution * proceeds up the parent chain of the view to get the value. If there is no parent, then it will * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. * * @attr ref android.R.styleable#View_textDirection */ public void setTextDirection(int textDirection) { if (getRawTextDirection() != textDirection) { // Reset the current text direction and the resolved one mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; resetResolvedTextDirection(); // Set the new text direction mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); // Do resolution resolveTextDirection(); // Notify change onRtlPropertiesChanged(getLayoutDirection()); // Refresh requestLayout(); invalidate(true); } } /** * Return the resolved text direction. * * @return the resolved text direction. Returns one of: * * {@link #TEXT_DIRECTION_FIRST_STRONG} * {@link #TEXT_DIRECTION_ANY_RTL}, * {@link #TEXT_DIRECTION_LTR}, * {@link #TEXT_DIRECTION_RTL}, * {@link #TEXT_DIRECTION_LOCALE} * * @attr ref android.R.styleable#View_textDirection */ @ViewDebug.ExportedProperty(category = "text", mapping = { @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") }) public int getTextDirection() { return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; } /** * Resolve the text direction. * * @return true if resolution has been done, false otherwise. * * @hide */ public boolean resolveTextDirection() { // Reset any previous text direction resolution mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); if (hasRtlSupport()) { // Set resolved text direction flag depending on text direction flag final int textDirection = getRawTextDirection(); switch(textDirection) { case TEXT_DIRECTION_INHERIT: if (!canResolveTextDirection()) { // We cannot do the resolution if there is no parent, so use the default one mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; // Resolution will need to happen again later return false; } // Parent has not yet resolved, so we still return the default try { if (!mParent.isTextDirectionResolved()) { mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; // Resolution will need to happen again later return false; } } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; return true; } // Set current resolved direction to the same value as the parent's one int parentResolvedDirection; try { parentResolvedDirection = mParent.getTextDirection(); } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); parentResolvedDirection = TEXT_DIRECTION_LTR; } switch (parentResolvedDirection) { case TEXT_DIRECTION_FIRST_STRONG: case TEXT_DIRECTION_ANY_RTL: case TEXT_DIRECTION_LTR: case TEXT_DIRECTION_RTL: case TEXT_DIRECTION_LOCALE: mPrivateFlags2 |= (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); break; default: // Default resolved direction is "first strong" heuristic mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; } break; case TEXT_DIRECTION_FIRST_STRONG: case TEXT_DIRECTION_ANY_RTL: case TEXT_DIRECTION_LTR: case TEXT_DIRECTION_RTL: case TEXT_DIRECTION_LOCALE: // Resolved direction is the same as text direction mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); break; default: // Default resolved direction is "first strong" heuristic mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; } } else { // Default resolved direction is "first strong" heuristic mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; } // Set to resolved mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; return true; } /** * Check if text direction resolution can be done. * * @return true if text direction resolution can be done otherwise return false. */ public boolean canResolveTextDirection() { switch (getRawTextDirection()) { case TEXT_DIRECTION_INHERIT: if (mParent != null) { try { return mParent.canResolveTextDirection(); } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); } } return false; default: return true; } } /** * Reset resolved text direction. Text direction will be resolved during a call to * {@link #onMeasure(int, int)}. * * @hide */ public void resetResolvedTextDirection() { // Reset any previous text direction resolution mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); // Set to default value mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; } /** * @return true if text direction is inherited. * * @hide */ public boolean isTextDirectionInherited() { return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); } /** * @return true if text direction is resolved. */ public boolean isTextDirectionResolved() { return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; } /** * Return the value specifying the text alignment or policy that was set with * {@link #setTextAlignment(int)}. * * @return the defined text alignment. It can be one of: * * {@link #TEXT_ALIGNMENT_INHERIT}, * {@link #TEXT_ALIGNMENT_GRAVITY}, * {@link #TEXT_ALIGNMENT_CENTER}, * {@link #TEXT_ALIGNMENT_TEXT_START}, * {@link #TEXT_ALIGNMENT_TEXT_END}, * {@link #TEXT_ALIGNMENT_VIEW_START}, * {@link #TEXT_ALIGNMENT_VIEW_END} * * @attr ref android.R.styleable#View_textAlignment * * @hide */ @ViewDebug.ExportedProperty(category = "text", mapping = { @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") }) public int getRawTextAlignment() { return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; } /** * Set the text alignment. * * @param textAlignment The text alignment to set. Should be one of * * {@link #TEXT_ALIGNMENT_INHERIT}, * {@link #TEXT_ALIGNMENT_GRAVITY}, * {@link #TEXT_ALIGNMENT_CENTER}, * {@link #TEXT_ALIGNMENT_TEXT_START}, * {@link #TEXT_ALIGNMENT_TEXT_END}, * {@link #TEXT_ALIGNMENT_VIEW_START}, * {@link #TEXT_ALIGNMENT_VIEW_END} * * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution * proceeds up the parent chain of the view to get the value. If there is no parent, then it * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. * * @attr ref android.R.styleable#View_textAlignment */ public void setTextAlignment(int textAlignment) { if (textAlignment != getRawTextAlignment()) { // Reset the current and resolved text alignment mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; resetResolvedTextAlignment(); // Set the new text alignment mPrivateFlags2 |= ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); // Do resolution resolveTextAlignment(); // Notify change onRtlPropertiesChanged(getLayoutDirection()); // Refresh requestLayout(); invalidate(true); } } /** * Return the resolved text alignment. * * @return the resolved text alignment. Returns one of: * * {@link #TEXT_ALIGNMENT_GRAVITY}, * {@link #TEXT_ALIGNMENT_CENTER}, * {@link #TEXT_ALIGNMENT_TEXT_START}, * {@link #TEXT_ALIGNMENT_TEXT_END}, * {@link #TEXT_ALIGNMENT_VIEW_START}, * {@link #TEXT_ALIGNMENT_VIEW_END} * * @attr ref android.R.styleable#View_textAlignment */ @ViewDebug.ExportedProperty(category = "text", mapping = { @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") }) public int getTextAlignment() { return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; } /** * Resolve the text alignment. * * @return true if resolution has been done, false otherwise. * * @hide */ public boolean resolveTextAlignment() { // Reset any previous text alignment resolution mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); if (hasRtlSupport()) { // Set resolved text alignment flag depending on text alignment flag final int textAlignment = getRawTextAlignment(); switch (textAlignment) { case TEXT_ALIGNMENT_INHERIT: // Check if we can resolve the text alignment if (!canResolveTextAlignment()) { // We cannot do the resolution if there is no parent so use the default mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; // Resolution will need to happen again later return false; } // Parent has not yet resolved, so we still return the default try { if (!mParent.isTextAlignmentResolved()) { mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; // Resolution will need to happen again later return false; } } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; return true; } int parentResolvedTextAlignment; try { parentResolvedTextAlignment = mParent.getTextAlignment(); } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY; } switch (parentResolvedTextAlignment) { case TEXT_ALIGNMENT_GRAVITY: case TEXT_ALIGNMENT_TEXT_START: case TEXT_ALIGNMENT_TEXT_END: case TEXT_ALIGNMENT_CENTER: case TEXT_ALIGNMENT_VIEW_START: case TEXT_ALIGNMENT_VIEW_END: // Resolved text alignment is the same as the parent resolved // text alignment mPrivateFlags2 |= (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); break; default: // Use default resolved text alignment mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; } break; case TEXT_ALIGNMENT_GRAVITY: case TEXT_ALIGNMENT_TEXT_START: case TEXT_ALIGNMENT_TEXT_END: case TEXT_ALIGNMENT_CENTER: case TEXT_ALIGNMENT_VIEW_START: case TEXT_ALIGNMENT_VIEW_END: // Resolved text alignment is the same as text alignment mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); break; default: // Use default resolved text alignment mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; } } else { // Use default resolved text alignment mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; } // Set the resolved mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; return true; } /** * Check if text alignment resolution can be done. * * @return true if text alignment resolution can be done otherwise return false. */ public boolean canResolveTextAlignment() { switch (getRawTextAlignment()) { case TEXT_DIRECTION_INHERIT: if (mParent != null) { try { return mParent.canResolveTextAlignment(); } catch (AbstractMethodError e) { Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + " does not fully implement ViewParent", e); } } return false; default: return true; } } /** * Reset resolved text alignment. Text alignment will be resolved during a call to * {@link #onMeasure(int, int)}. * * @hide */ public void resetResolvedTextAlignment() { // Reset any previous text alignment resolution mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); // Set to default mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; } /** * @return true if text alignment is inherited. * * @hide */ public boolean isTextAlignmentInherited() { return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); } /** * @return true if text alignment is resolved. */ public boolean isTextAlignmentResolved() { return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; } /** * Generate a value suitable for use in {@link #setId(int)}. * This value will not collide with ID values generated at build time by aapt for R.id. * * @return a generated ID value */ public static int generateViewId() { for (;;) { final int result = sNextGeneratedId.get(); // aapt-generated IDs have the high byte nonzero; clamp to the range under that. int newValue = result + 1; if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. if (sNextGeneratedId.compareAndSet(result, newValue)) { return result; } } } // // Properties // /** * A Property wrapper around the alpha functionality handled by the * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. */ public static final Property ALPHA = new FloatProperty("alpha") { @Override public void setValue(View object, float value) { object.setAlpha(value); } @Override public Float get(View object) { return object.getAlpha(); } }; /** * A Property wrapper around the translationX functionality handled by the * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. */ public static final Property TRANSLATION_X = new FloatProperty("translationX") { @Override public void setValue(View object, float value) { object.setTranslationX(value); } @Override public Float get(View object) { return object.getTranslationX(); } }; /** * A Property wrapper around the translationY functionality handled by the * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. */ public static final Property TRANSLATION_Y = new FloatProperty("translationY") { @Override public void setValue(View object, float value) { object.setTranslationY(value); } @Override public Float get(View object) { return object.getTranslationY(); } }; /** * A Property wrapper around the x functionality handled by the * {@link View#setX(float)} and {@link View#getX()} methods. */ public static final Property X = new FloatProperty("x") { @Override public void setValue(View object, float value) { object.setX(value); } @Override public Float get(View object) { return object.getX(); } }; /** * A Property wrapper around the y functionality handled by the * {@link View#setY(float)} and {@link View#getY()} methods. */ public static final Property Y = new FloatProperty("y") { @Override public void setValue(View object, float value) { object.setY(value); } @Override public Float get(View object) { return object.getY(); } }; /** * A Property wrapper around the rotation functionality handled by the * {@link View#setRotation(float)} and {@link View#getRotation()} methods. */ public static final Property ROTATION = new FloatProperty("rotation") { @Override public void setValue(View object, float value) { object.setRotation(value); } @Override public Float get(View object) { return object.getRotation(); } }; /** * A Property wrapper around the rotationX functionality handled by the * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. */ public static final Property ROTATION_X = new FloatProperty("rotationX") { @Override public void setValue(View object, float value) { object.setRotationX(value); } @Override public Float get(View object) { return object.getRotationX(); } }; /** * A Property wrapper around the rotationY functionality handled by the * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. */ public static final Property ROTATION_Y = new FloatProperty("rotationY") { @Override public void setValue(View object, float value) { object.setRotationY(value); } @Override public Float get(View object) { return object.getRotationY(); } }; /** * A Property wrapper around the scaleX functionality handled by the * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. */ public static final Property SCALE_X = new FloatProperty("scaleX") { @Override public void setValue(View object, float value) { object.setScaleX(value); } @Override public Float get(View object) { return object.getScaleX(); } }; /** * A Property wrapper around the scaleY functionality handled by the * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. */ public static final Property SCALE_Y = new FloatProperty("scaleY") { @Override public void setValue(View object, float value) { object.setScaleY(value); } @Override public Float get(View object) { return object.getScaleY(); } }; /** * A MeasureSpec encapsulates the layout requirements passed from parent to child. * Each MeasureSpec represents a requirement for either the width or the height. * A MeasureSpec is comprised of a size and a mode. There are three possible * modes: *
*
UNSPECIFIED
*
* The parent has not imposed any constraint on the child. It can be whatever size * it wants. *
* *
EXACTLY
*
* The parent has determined an exact size for the child. The child is going to be * given those bounds regardless of how big it wants to be. *
* *
AT_MOST
*
* The child can be as large as it wants up to the specified size. *
*
* * MeasureSpecs are implemented as ints to reduce object allocation. This class * is provided to pack and unpack the tuple into the int. */ public static class MeasureSpec { private static final int MODE_SHIFT = 30; private static final int MODE_MASK = 0x3 << MODE_SHIFT; /** * Measure specification mode: The parent has not imposed any constraint * on the child. It can be whatever size it wants. */ public static final int UNSPECIFIED = 0 << MODE_SHIFT; /** * Measure specification mode: The parent has determined an exact size * for the child. The child is going to be given those bounds regardless * of how big it wants to be. */ public static final int EXACTLY = 1 << MODE_SHIFT; /** * Measure specification mode: The child can be as large as it wants up * to the specified size. */ public static final int AT_MOST = 2 << MODE_SHIFT; /** * Creates a measure specification based on the supplied size and mode. * * The mode must always be one of the following: *
    *
  • {@link android.view.View.MeasureSpec#UNSPECIFIED}
  • *
  • {@link android.view.View.MeasureSpec#EXACTLY}
  • *
  • {@link android.view.View.MeasureSpec#AT_MOST}
  • *
* *

Note: On API level 17 and lower, makeMeasureSpec's * implementation was such that the order of arguments did not matter * and overflow in either value could impact the resulting MeasureSpec. * {@link android.widget.RelativeLayout} was affected by this bug. * Apps targeting API levels greater than 17 will get the fixed, more strict * behavior.

* * @param size the size of the measure specification * @param mode the mode of the measure specification * @return the measure specification based on size and mode */ public static int makeMeasureSpec(int size, int mode) { if (sUseBrokenMakeMeasureSpec) { return size + mode; } else { return (size & ~MODE_MASK) | (mode & MODE_MASK); } } /** * Extracts the mode from the supplied measure specification. * * @param measureSpec the measure specification to extract the mode from * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, * {@link android.view.View.MeasureSpec#AT_MOST} or * {@link android.view.View.MeasureSpec#EXACTLY} */ public static int getMode(int measureSpec) { return (measureSpec & MODE_MASK); } /** * Extracts the size from the supplied measure specification. * * @param measureSpec the measure specification to extract the size from * @return the size in pixels defined in the supplied measure specification */ public static int getSize(int measureSpec) { return (measureSpec & ~MODE_MASK); } static int adjust(int measureSpec, int delta) { return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); } /** * Returns a String representation of the specified measure * specification. * * @param measureSpec the measure specification to convert to a String * @return a String with the following format: "MeasureSpec: MODE SIZE" */ public static String toString(int measureSpec) { int mode = getMode(measureSpec); int size = getSize(measureSpec); StringBuilder sb = new StringBuilder("MeasureSpec: "); if (mode == UNSPECIFIED) sb.append("UNSPECIFIED "); else if (mode == EXACTLY) sb.append("EXACTLY "); else if (mode == AT_MOST) sb.append("AT_MOST "); else sb.append(mode).append(" "); sb.append(size); return sb.toString(); } } class CheckForLongPress implements Runnable { private int mOriginalWindowAttachCount; public void run() { if (isPressed() && (mParent != null) && mOriginalWindowAttachCount == mWindowAttachCount) { if (performLongClick()) { mHasPerformedLongPress = true; } } } public void rememberWindowAttachCount() { mOriginalWindowAttachCount = mWindowAttachCount; } } private final class CheckForTap implements Runnable { public void run() { mPrivateFlags &= ~PFLAG_PREPRESSED; setPressed(true); checkForLongClick(ViewConfiguration.getTapTimeout()); } } private final class PerformClick implements Runnable { public void run() { performClick(); } } /** @hide */ public void hackTurnOffWindowResizeAnim(boolean off) { mAttachInfo.mTurnOffWindowResizeAnim = off; } /** * This method returns a ViewPropertyAnimator object, which can be used to animate * specific properties on this View. * * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. */ public ViewPropertyAnimator animate() { if (mAnimator == null) { mAnimator = new ViewPropertyAnimator(this); } return mAnimator; } /** * Interface definition for a callback to be invoked when a hardware key event is * dispatched to this view. The callback will be invoked before the key event is * given to the view. This is only useful for hardware keyboards; a software input * method has no obligation to trigger this listener. */ public interface OnKeyListener { /** * Called when a hardware key is dispatched to a view. This allows listeners to * get a chance to respond before the target view. *

Key presses in software keyboards will generally NOT trigger this method, * although some may elect to do so in some situations. Do not assume a * software input method has to be key-based; even if it is, it may use key presses * in a different way than you expect, so there is no way to reliably catch soft * input key presses. * * @param v The view the key has been dispatched to. * @param keyCode The code for the physical key that was pressed * @param event The KeyEvent object containing full information about * the event. * @return True if the listener has consumed the event, false otherwise. */ boolean onKey(View v, int keyCode, KeyEvent event); } /** * Interface definition for a callback to be invoked when a touch event is * dispatched to this view. The callback will be invoked before the touch * event is given to the view. */ public interface OnTouchListener { /** * Called when a touch event is dispatched to a view. This allows listeners to * get a chance to respond before the target view. * * @param v The view the touch event has been dispatched to. * @param event The MotionEvent object containing full information about * the event. * @return True if the listener has consumed the event, false otherwise. */ boolean onTouch(View v, MotionEvent event); } /** * Interface definition for a callback to be invoked when a hover event is * dispatched to this view. The callback will be invoked before the hover * event is given to the view. */ public interface OnHoverListener { /** * Called when a hover event is dispatched to a view. This allows listeners to * get a chance to respond before the target view. * * @param v The view the hover event has been dispatched to. * @param event The MotionEvent object containing full information about * the event. * @return True if the listener has consumed the event, false otherwise. */ boolean onHover(View v, MotionEvent event); } /** * Interface definition for a callback to be invoked when a generic motion event is * dispatched to this view. The callback will be invoked before the generic motion * event is given to the view. */ public interface OnGenericMotionListener { /** * Called when a generic motion event is dispatched to a view. This allows listeners to * get a chance to respond before the target view. * * @param v The view the generic motion event has been dispatched to. * @param event The MotionEvent object containing full information about * the event. * @return True if the listener has consumed the event, false otherwise. */ boolean onGenericMotion(View v, MotionEvent event); } /** * Interface definition for a callback to be invoked when a view has been clicked and held. */ public interface OnLongClickListener { /** * Called when a view has been clicked and held. * * @param v The view that was clicked and held. * * @return true if the callback consumed the long click, false otherwise. */ boolean onLongClick(View v); } /** * Interface definition for a callback to be invoked when a drag is being dispatched * to this view. The callback will be invoked before the hosting view's own * onDrag(event) method. If the listener wants to fall back to the hosting view's * onDrag(event) behavior, it should return 'false' from this callback. * *

*

Developer Guides

*

For a guide to implementing drag and drop features, read the * Drag and Drop developer guide.

*
*/ public interface OnDragListener { /** * Called when a drag event is dispatched to a view. This allows listeners * to get a chance to override base View behavior. * * @param v The View that received the drag event. * @param event The {@link android.view.DragEvent} object for the drag event. * @return {@code true} if the drag event was handled successfully, or {@code false} * if the drag event was not handled. Note that {@code false} will trigger the View * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. */ boolean onDrag(View v, DragEvent event); } /** * Interface definition for a callback to be invoked when the focus state of * a view changed. */ public interface OnFocusChangeListener { /** * Called when the focus state of a view has changed. * * @param v The view whose state has changed. * @param hasFocus The new focus state of v. */ void onFocusChange(View v, boolean hasFocus); } /** * Interface definition for a callback to be invoked when a view is clicked. */ public interface OnClickListener { /** * Called when a view has been clicked. * * @param v The view that was clicked. */ void onClick(View v); } /** * Interface definition for a callback to be invoked when the context menu * for this view is being built. */ public interface OnCreateContextMenuListener { /** * Called when the context menu for this view is being built. It is not * safe to hold onto the menu after this method returns. * * @param menu The context menu that is being built * @param v The view for which the context menu is being built * @param menuInfo Extra information about the item for which the * context menu should be shown. This information will vary * depending on the class of v. */ void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); } /** * Interface definition for a callback to be invoked when the status bar changes * visibility. This reports global changes to the system UI * state, not what the application is requesting. * * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) */ public interface OnSystemUiVisibilityChangeListener { /** * Called when the status bar changes visibility because of a call to * {@link View#setSystemUiVisibility(int)}. * * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. * This tells you the global state of these UI visibility * flags, not what your app is currently applying. */ public void onSystemUiVisibilityChange(int visibility); } /** * Interface definition for a callback to be invoked when this view is attached * or detached from its window. */ public interface OnAttachStateChangeListener { /** * Called when the view is attached to a window. * @param v The view that was attached */ public void onViewAttachedToWindow(View v); /** * Called when the view is detached from a window. * @param v The view that was detached */ public void onViewDetachedFromWindow(View v); } private final class UnsetPressedState implements Runnable { public void run() { setPressed(false); } } /** * Base class for derived classes that want to save and restore their own * state in {@link android.view.View#onSaveInstanceState()}. */ public static class BaseSavedState extends AbsSavedState { /** * Constructor used when reading from a parcel. Reads the state of the superclass. * * @param source */ public BaseSavedState(Parcel source) { super(source); } /** * Constructor called by derived classes when creating their SavedState objects * * @param superState The state of the superclass of this view */ public BaseSavedState(Parcelable superState) { super(superState); } public static final Parcelable.Creator CREATOR = new Parcelable.Creator() { public BaseSavedState createFromParcel(Parcel in) { return new BaseSavedState(in); } public BaseSavedState[] newArray(int size) { return new BaseSavedState[size]; } }; } /** * A set of information given to a view when it is attached to its parent * window. */ static class AttachInfo { interface Callbacks { void playSoundEffect(int effectId); boolean performHapticFeedback(int effectId, boolean always); } /** * InvalidateInfo is used to post invalidate(int, int, int, int) messages * to a Handler. This class contains the target (View) to invalidate and * the coordinates of the dirty rectangle. * * For performance purposes, this class also implements a pool of up to * POOL_LIMIT objects that get reused. This reduces memory allocations * whenever possible. */ static class InvalidateInfo { private static final int POOL_LIMIT = 10; private static final SynchronizedPool sPool = new SynchronizedPool(POOL_LIMIT); View target; int left; int top; int right; int bottom; public static InvalidateInfo obtain() { InvalidateInfo instance = sPool.acquire(); return (instance != null) ? instance : new InvalidateInfo(); } public void recycle() { target = null; sPool.release(this); } } final IWindowSession mSession; final IWindow mWindow; final IBinder mWindowToken; final Display mDisplay; final Callbacks mRootCallbacks; HardwareCanvas mHardwareCanvas; IWindowId mIWindowId; WindowId mWindowId; /** * The top view of the hierarchy. */ View mRootView; IBinder mPanelParentWindowToken; Surface mSurface; boolean mHardwareAccelerated; boolean mHardwareAccelerationRequested; HardwareRenderer mHardwareRenderer; boolean mScreenOn; /** * Scale factor used by the compatibility mode */ float mApplicationScale; /** * Indicates whether the application is in compatibility mode */ boolean mScalingRequired; /** * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. */ boolean mTurnOffWindowResizeAnim; /** * Left position of this view's window */ int mWindowLeft; /** * Top position of this view's window */ int mWindowTop; /** * Indicates whether views need to use 32-bit drawing caches */ boolean mUse32BitDrawingCache; /** * For windows that are full-screen but using insets to layout inside * of the screen areas, these are the current insets to appear inside * the overscan area of the display. */ final Rect mOverscanInsets = new Rect(); /** * For windows that are full-screen but using insets to layout inside * of the screen decorations, these are the current insets for the * content of the window. */ final Rect mContentInsets = new Rect(); /** * For windows that are full-screen but using insets to layout inside * of the screen decorations, these are the current insets for the * actual visible parts of the window. */ final Rect mVisibleInsets = new Rect(); /** * The internal insets given by this window. This value is * supplied by the client (through * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will * be given to the window manager when changed to be used in laying * out windows behind it. */ final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets = new ViewTreeObserver.InternalInsetsInfo(); /** * Set to true when mGivenInternalInsets is non-empty. */ boolean mHasNonEmptyGivenInternalInsets; /** * All views in the window's hierarchy that serve as scroll containers, * used to determine if the window can be resized or must be panned * to adjust for a soft input area. */ final ArrayList mScrollContainers = new ArrayList(); final KeyEvent.DispatcherState mKeyDispatchState = new KeyEvent.DispatcherState(); /** * Indicates whether the view's window currently has the focus. */ boolean mHasWindowFocus; /** * The current visibility of the window. */ int mWindowVisibility; /** * Indicates the time at which drawing started to occur. */ long mDrawingTime; /** * Indicates whether or not ignoring the DIRTY_MASK flags. */ boolean mIgnoreDirtyState; /** * This flag tracks when the mIgnoreDirtyState flag is set during draw(), * to avoid clearing that flag prematurely. */ boolean mSetIgnoreDirtyState = false; /** * Indicates whether the view's window is currently in touch mode. */ boolean mInTouchMode; /** * Indicates that ViewAncestor should trigger a global layout change * the next time it performs a traversal */ boolean mRecomputeGlobalAttributes; /** * Always report new attributes at next traversal. */ boolean mForceReportNewAttributes; /** * Set during a traveral if any views want to keep the screen on. */ boolean mKeepScreenOn; /** * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). */ int mSystemUiVisibility; /** * Hack to force certain system UI visibility flags to be cleared. */ int mDisabledSystemUiVisibility; /** * Last global system UI visibility reported by the window manager. */ int mGlobalSystemUiVisibility; /** * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener * attached. */ boolean mHasSystemUiListeners; /** * Set if the window has requested to extend into the overscan region * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. */ boolean mOverscanRequested; /** * Set if the visibility of any views has changed. */ boolean mViewVisibilityChanged; /** * Set to true if a view has been scrolled. */ boolean mViewScrollChanged; /** * Global to the view hierarchy used as a temporary for dealing with * x/y points in the transparent region computations. */ final int[] mTransparentLocation = new int[2]; /** * Global to the view hierarchy used as a temporary for dealing with * x/y points in the ViewGroup.invalidateChild implementation. */ final int[] mInvalidateChildLocation = new int[2]; /** * Global to the view hierarchy used as a temporary for dealing with * x/y location when view is transformed. */ final float[] mTmpTransformLocation = new float[2]; /** * The view tree observer used to dispatch global events like * layout, pre-draw, touch mode change, etc. */ final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); /** * A Canvas used by the view hierarchy to perform bitmap caching. */ Canvas mCanvas; /** * The view root impl. */ final ViewRootImpl mViewRootImpl; /** * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This * handler can be used to pump events in the UI events queue. */ final Handler mHandler; /** * Temporary for use in computing invalidate rectangles while * calling up the hierarchy. */ final Rect mTmpInvalRect = new Rect(); /** * Temporary for use in computing hit areas with transformed views */ final RectF mTmpTransformRect = new RectF(); /** * Temporary for use in transforming invalidation rect */ final Matrix mTmpMatrix = new Matrix(); /** * Temporary for use in transforming invalidation rect */ final Transformation mTmpTransformation = new Transformation(); /** * Temporary list for use in collecting focusable descendents of a view. */ final ArrayList mTempArrayList = new ArrayList(24); /** * The id of the window for accessibility purposes. */ int mAccessibilityWindowId = View.NO_ID; /** * Flags related to accessibility processing. * * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS */ int mAccessibilityFetchFlags; /** * The drawable for highlighting accessibility focus. */ Drawable mAccessibilityFocusDrawable; /** * Show where the margins, bounds and layout bounds are for each view. */ boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); /** * Point used to compute visible regions. */ final Point mPoint = new Point(); /** * Used to track which View originated a requestLayout() call, used when * requestLayout() is called during layout. */ View mViewRequestingLayout; /** * Creates a new set of attachment information with the specified * events handler and thread. * * @param handler the events handler the view must use */ AttachInfo(IWindowSession session, IWindow window, Display display, ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { mSession = session; mWindow = window; mWindowToken = window.asBinder(); mDisplay = display; mViewRootImpl = viewRootImpl; mHandler = handler; mRootCallbacks = effectPlayer; } } /** *

ScrollabilityCache holds various fields used by a View when scrolling * is supported. This avoids keeping too many unused fields in most * instances of View.

*/ private static class ScrollabilityCache implements Runnable { /** * Scrollbars are not visible */ public static final int OFF = 0; /** * Scrollbars are visible */ public static final int ON = 1; /** * Scrollbars are fading away */ public static final int FADING = 2; public boolean fadeScrollBars; public int fadingEdgeLength; public int scrollBarDefaultDelayBeforeFade; public int scrollBarFadeDuration; public int scrollBarSize; public ScrollBarDrawable scrollBar; public float[] interpolatorValues; public View host; public final Paint paint; public final Matrix matrix; public Shader shader; public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); private static final float[] OPAQUE = { 255 }; private static final float[] TRANSPARENT = { 0.0f }; /** * When fading should start. This time moves into the future every time * a new scroll happens. Measured based on SystemClock.uptimeMillis() */ public long fadeStartTime; /** * The current state of the scrollbars: ON, OFF, or FADING */ public int state = OFF; private int mLastColor; public ScrollabilityCache(ViewConfiguration configuration, View host) { fadingEdgeLength = configuration.getScaledFadingEdgeLength(); scrollBarSize = configuration.getScaledScrollBarSize(); scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); paint = new Paint(); matrix = new Matrix(); // use use a height of 1, and then wack the matrix each time we // actually use it. shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); paint.setShader(shader); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); this.host = host; } public void setFadeColor(int color) { if (color != mLastColor) { mLastColor = color; if (color != 0) { shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, color & 0x00FFFFFF, Shader.TileMode.CLAMP); paint.setShader(shader); // Restore the default transfer mode (src_over) paint.setXfermode(null); } else { shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); paint.setShader(shader); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); } } } public void run() { long now = AnimationUtils.currentAnimationTimeMillis(); if (now >= fadeStartTime) { // the animation fades the scrollbars out by changing // the opacity (alpha) from fully opaque to fully // transparent int nextFrame = (int) now; int framesCount = 0; Interpolator interpolator = scrollBarInterpolator; // Start opaque interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); // End transparent nextFrame += scrollBarFadeDuration; interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); state = FADING; // Kick off the fade animation host.invalidate(true); } } } /** * Resuable callback for sending * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. */ private class SendViewScrolledAccessibilityEvent implements Runnable { public volatile boolean mIsPending; public void run() { sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); mIsPending = false; } } /** *

* This class represents a delegate that can be registered in a {@link View} * to enhance accessibility support via composition rather via inheritance. * It is specifically targeted to widget developers that extend basic View * classes i.e. classes in package android.view, that would like their * applications to be backwards compatible. *

*
*

Developer Guides

*

For more information about making applications accessible, read the * Accessibility * developer guide.

*
*

* A scenario in which a developer would like to use an accessibility delegate * is overriding a method introduced in a later API version then the minimal API * version supported by the application. For example, the method * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available * in API version 4 when the accessibility APIs were first introduced. If a * developer would like his application to run on API version 4 devices (assuming * all other APIs used by the application are version 4 or lower) and take advantage * of this method, instead of overriding the method which would break the application's * backwards compatibility, he can override the corresponding method in this * delegate and register the delegate in the target View if the API version of * the system is high enough i.e. the API version is same or higher to the API * version that introduced * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. *

*

* Here is an example implementation: *

*

* if (Build.VERSION.SDK_INT >= 14) { * // If the API version is equal of higher than the version in * // which onInitializeAccessibilityNodeInfo was introduced we * // register a delegate with a customized implementation. * View view = findViewById(R.id.view_id); * view.setAccessibilityDelegate(new AccessibilityDelegate() { * public void onInitializeAccessibilityNodeInfo(View host, * AccessibilityNodeInfo info) { * // Let the default implementation populate the info. * super.onInitializeAccessibilityNodeInfo(host, info); * // Set some other information. * info.setEnabled(host.isEnabled()); * } * }); * } *

*

* This delegate contains methods that correspond to the accessibility methods * in View. If a delegate has been specified the implementation in View hands * off handling to the corresponding method in this delegate. The default * implementation the delegate methods behaves exactly as the corresponding * method in View for the case of no accessibility delegate been set. Hence, * to customize the behavior of a View method, clients can override only the * corresponding delegate method without altering the behavior of the rest * accessibility related methods of the host view. *

*/ public static class AccessibilityDelegate { /** * Sends an accessibility event of the given type. If accessibility is not * enabled this method has no effect. *

* The default implementation behaves as {@link View#sendAccessibilityEvent(int) * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate * been set. *

* * @param host The View hosting the delegate. * @param eventType The type of the event to send. * * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) */ public void sendAccessibilityEvent(View host, int eventType) { host.sendAccessibilityEventInternal(eventType); } /** * Performs the specified accessibility action on the view. For * possible accessibility actions look at {@link AccessibilityNodeInfo}. *

* The default implementation behaves as * {@link View#performAccessibilityAction(int, Bundle) * View#performAccessibilityAction(int, Bundle)} for the case of * no accessibility delegate been set. *

* * @param action The action to perform. * @return Whether the action was performed. * * @see View#performAccessibilityAction(int, Bundle) * View#performAccessibilityAction(int, Bundle) */ public boolean performAccessibilityAction(View host, int action, Bundle args) { return host.performAccessibilityActionInternal(action, args); } /** * Sends an accessibility event. This method behaves exactly as * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an * empty {@link AccessibilityEvent} and does not perform a check whether * accessibility is enabled. *

* The default implementation behaves as * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for * the case of no accessibility delegate been set. *

* * @param host The View hosting the delegate. * @param event The event to send. * * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) * View#sendAccessibilityEventUnchecked(AccessibilityEvent) */ public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { host.sendAccessibilityEventUncheckedInternal(event); } /** * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then * to its children for adding their text content to the event. *

* The default implementation behaves as * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for * the case of no accessibility delegate been set. *

* * @param host The View hosting the delegate. * @param event The event. * @return True if the event population was completed. * * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) */ public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { return host.dispatchPopulateAccessibilityEventInternal(event); } /** * Gives a chance to the host View to populate the accessibility event with its * text content. *

* The default implementation behaves as * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for * the case of no accessibility delegate been set. *

* * @param host The View hosting the delegate. * @param event The accessibility event which to populate. * * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) * View#onPopulateAccessibilityEvent(AccessibilityEvent) */ public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { host.onPopulateAccessibilityEventInternal(event); } /** * Initializes an {@link AccessibilityEvent} with information about the * the host View which is the event source. *

* The default implementation behaves as * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for * the case of no accessibility delegate been set. *

* * @param host The View hosting the delegate. * @param event The event to initialize. * * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) * View#onInitializeAccessibilityEvent(AccessibilityEvent) */ public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { host.onInitializeAccessibilityEventInternal(event); } /** * Initializes an {@link AccessibilityNodeInfo} with information about the host view. *

* The default implementation behaves as * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for * the case of no accessibility delegate been set. *

* * @param host The View hosting the delegate. * @param info The instance to initialize. * * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) */ public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { host.onInitializeAccessibilityNodeInfoInternal(info); } /** * Called when a child of the host View has requested sending an * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) * to augment the event. *

* The default implementation behaves as * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for * the case of no accessibility delegate been set. *

* * @param host The View hosting the delegate. * @param child The child which requests sending the event. * @param event The event to be sent. * @return True if the event should be sent * * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) */ public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, AccessibilityEvent event) { return host.onRequestSendAccessibilityEventInternal(child, event); } /** * Gets the provider for managing a virtual view hierarchy rooted at this View * and reported to {@link android.accessibilityservice.AccessibilityService}s * that explore the window content. *

* The default implementation behaves as * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for * the case of no accessibility delegate been set. *

* * @return The provider. * * @see AccessibilityNodeProvider */ public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { return null; } /** * Returns an {@link AccessibilityNodeInfo} representing the host view from the * point of view of an {@link android.accessibilityservice.AccessibilityService}. * This method is responsible for obtaining an accessibility node info from a * pool of reusable instances and calling * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host * view to initialize the former. *

* Note: The client is responsible for recycling the obtained * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object * creation. *

*

* The default implementation behaves as * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for * the case of no accessibility delegate been set. *

* @return A populated {@link AccessibilityNodeInfo}. * * @see AccessibilityNodeInfo * * @hide */ public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { return host.createAccessibilityNodeInfoInternal(); } } private class MatchIdPredicate implements Predicate { public int mId; @Override public boolean apply(View view) { return (view.mID == mId); } } private class MatchLabelForPredicate implements Predicate { private int mLabeledId; @Override public boolean apply(View view) { return (view.mLabelForId == mLabeledId); } } private class SendViewStateChangedAccessibilityEvent implements Runnable { private int mChangeTypes = 0; private boolean mPosted; private boolean mPostedWithDelay; private long mLastEventTimeMillis; @Override public void run() { mPosted = false; mPostedWithDelay = false; mLastEventTimeMillis = SystemClock.uptimeMillis(); if (AccessibilityManager.getInstance(mContext).isEnabled()) { final AccessibilityEvent event = AccessibilityEvent.obtain(); event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED); event.setContentChangeTypes(mChangeTypes); sendAccessibilityEventUnchecked(event); } mChangeTypes = 0; } public void runOrPost(int changeType) { mChangeTypes |= changeType; // If this is a live region or the child of a live region, collect // all events from this frame and send them on the next frame. if (inLiveRegion()) { // If we're already posted with a delay, remove that. if (mPostedWithDelay) { removeCallbacks(this); mPostedWithDelay = false; } // Only post if we're not already posted. if (!mPosted) { post(this); mPosted = true; } return; } if (mPosted) { return; } final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis; final long minEventIntevalMillis = ViewConfiguration.getSendRecurringAccessibilityEventsInterval(); if (timeSinceLastMillis >= minEventIntevalMillis) { removeCallbacks(this); run(); } else { postDelayed(this, minEventIntevalMillis - timeSinceLastMillis); mPosted = true; mPostedWithDelay = true; } } } private boolean inLiveRegion() { if (getAccessibilityLiveRegion() != View.ACCESSIBILITY_LIVE_REGION_NONE) { return true; } ViewParent parent = getParent(); while (parent instanceof View) { if (((View) parent).getAccessibilityLiveRegion() != View.ACCESSIBILITY_LIVE_REGION_NONE) { return true; } parent = parent.getParent(); } return false; } /** * Dump all private flags in readable format, useful for documentation and * sanity checking. */ private static void dumpFlags() { final HashMap found = Maps.newHashMap(); try { for (Field field : View.class.getDeclaredFields()) { final int modifiers = field.getModifiers(); if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { if (field.getType().equals(int.class)) { final int value = field.getInt(null); dumpFlag(found, field.getName(), value); } else if (field.getType().equals(int[].class)) { final int[] values = (int[]) field.get(null); for (int i = 0; i < values.length; i++) { dumpFlag(found, field.getName() + "[" + i + "]", values[i]); } } } } } catch (IllegalAccessException e) { throw new RuntimeException(e); } final ArrayList keys = Lists.newArrayList(); keys.addAll(found.keySet()); Collections.sort(keys); for (String key : keys) { Log.d(VIEW_LOG_TAG, found.get(key)); } } private static void dumpFlag(HashMap found, String name, int value) { // Sort flags by prefix, then by bits, always keeping unique keys final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); final int prefix = name.indexOf('_'); final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; final String output = bits + " " + name; found.put(key, output); }}


(编辑: tfs080640234)

网友评论
相关文章