IT. Expert System.

Android Reference

ViewGroup

android.view

Class ViewGroup

java.lang.Object
- android.view.View
- - android.view.ViewGroup

All Implemented Interfaces:

Drawable.Callback, AccessibilityEventSource, KeyEvent.Callback, ViewManager, ViewParent

Direct Known Subclasses:

AbsoluteLayout, ActivityChooserView, AdapterView, FragmentBreadCrumbs, FrameLayout, GridLayout, GridLayout, LinearLayout, PagerTitleStrip, RelativeLayout, SlidingDrawer, ViewPager
```
public abstract class ViewGroup
extends View
implements ViewParent, ViewManager
```
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 ViewGroup.LayoutParams class which serves as the base class for layouts parameters.

Also see ViewGroup.LayoutParams for layout attributes.

Developer Guides

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

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`ViewGroup.LayoutParams` LayoutParams are used by views to tell their parents how they want to be laid out.
`static class`	`ViewGroup.MarginLayoutParams` Per-child layout information for layouts that support margins.
`static interface`	`ViewGroup.OnHierarchyChangeListener` Interface definition for a callback to be invoked when the hierarchy within this view changed.

Nested classes/interfaces inherited from class android.view.View
View.AccessibilityDelegate, View.BaseSavedState, View.DragShadowBuilder, View.MeasureSpec, View.OnAttachStateChangeListener, View.OnClickListener, View.OnCreateContextMenuListener, View.OnDragListener, View.OnFocusChangeListener, View.OnGenericMotionListener, View.OnHoverListener, View.OnKeyListener, View.OnLayoutChangeListener, View.OnLongClickListener, View.OnSystemUiVisibilityChangeListener, View.OnTouchListener

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`CLIP_BOUNDS` This constant is a `layoutMode`.
`protected static int`	`CLIP_TO_PADDING_MASK` We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL are set at the same time.
`protected static int`	`FLAG_DISALLOW_INTERCEPT` When set, this ViewGroup should not intercept touch events.
`protected static int`	`FLAG_SUPPORT_STATIC_TRANSFORMATIONS` When set, this ViewGroup supports static transformations on children; this causes `getChildStaticTransformation(View, android.view.animation.Transformation)` to be invoked when a child is drawn.
`protected static int`	`FLAG_USE_CHILD_DRAWING_ORDER` When set, the drawing method will call `getChildDrawingOrder(int, int)` to get the index of the child to draw for that iteration.
`static int`	`FOCUS_AFTER_DESCENDANTS` This view will get focus only if none of its descendants want it.
`static int`	`FOCUS_BEFORE_DESCENDANTS` This view will get focus before any of its descendants.
`static int`	`FOCUS_BLOCK_DESCENDANTS` This view will block any of its descendants from getting focus, even if they are focusable.
`protected ArrayList<View>`	`mDisappearingChildren` Views which have been hidden or removed which need to be animated on their way out.
`protected int`	`mGroupFlags` Internal flags.
`protected ViewGroup.OnHierarchyChangeListener`	`mOnHierarchyChangeListener` Listener used to propagate events indicating when children are added and/or removed from a view group.
`protected int`	`mPersistentDrawingCache` Indicates which types of drawing caches are to be kept in memory.
`static int`	`OPTICAL_BOUNDS` This constant is a `layoutMode`.
`static int`	`PERSISTENT_ALL_CACHES` Used to indicate that all drawing caches should be kept in memory.
`static int`	`PERSISTENT_ANIMATION_CACHE` Used to indicate that the animation drawing cache should be kept in memory.
`static int`	`PERSISTENT_NO_CACHE` Used to indicate that no drawing cache should be kept in memory.
`static int`	`PERSISTENT_SCROLLING_CACHE` Used to indicate that the scrolling drawing cache should be kept in memory.

Fields inherited from class android.view.View
ALPHA, DEBUG_LAYOUT_PROPERTY, DRAG_FLAG_GLOBAL, DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_HIGH, DRAWING_CACHE_QUALITY_LOW, EMPTY_STATE_SET, ENABLED_FOCUSED_SELECTED_STATE_SET, ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, ENABLED_FOCUSED_STATE_SET, ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET, ENABLED_SELECTED_STATE_SET, ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET, ENABLED_STATE_SET, ENABLED_WINDOW_FOCUSED_STATE_SET, FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS, FIND_VIEWS_WITH_CONTENT_DESCRIPTION, FIND_VIEWS_WITH_TEXT, FOCUS_BACKWARD, FOCUS_DOWN, FOCUS_FORWARD, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_UP, FOCUSABLES_ALL, FOCUSABLES_TOUCH_MODE, FOCUSED_SELECTED_STATE_SET, FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, FOCUSED_STATE_SET, FOCUSED_WINDOW_FOCUSED_STATE_SET, GONE, HAPTIC_FEEDBACK_ENABLED, IMPORTANT_FOR_ACCESSIBILITY_AUTO, IMPORTANT_FOR_ACCESSIBILITY_NO, IMPORTANT_FOR_ACCESSIBILITY_YES, INVISIBLE, KEEP_SCREEN_ON, LAYER_TYPE_HARDWARE, LAYER_TYPE_NONE, LAYER_TYPE_SOFTWARE, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE, LAYOUT_DIRECTION_LTR, LAYOUT_DIRECTION_RTL, mBottom, mCachingFailed, mContext, mCurrentAnimation, MEASURED_HEIGHT_STATE_SHIFT, MEASURED_SIZE_MASK, MEASURED_STATE_MASK, MEASURED_STATE_TOO_SMALL, mInputEventConsistencyVerifier, mLayoutParams, mLeft, mPaddingBottom, mPaddingLeft, mPaddingRight, mPaddingTop, mParent, mRight, mScrollX, mScrollY, mTag, mTop, mUserPaddingBottom, mUserPaddingLeft, mUserPaddingRight, NO_ID, OVER_SCROLL_ALWAYS, OVER_SCROLL_IF_CONTENT_SCROLLS, OVER_SCROLL_NEVER, PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET, PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, PRESSED_ENABLED_FOCUSED_STATE_SET, PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET, PRESSED_ENABLED_SELECTED_STATE_SET, PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET, PRESSED_ENABLED_STATE_SET, PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET, PRESSED_FOCUSED_SELECTED_STATE_SET, PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, PRESSED_FOCUSED_STATE_SET, PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET, PRESSED_SELECTED_STATE_SET, PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET, PRESSED_STATE_SET, PRESSED_WINDOW_FOCUSED_STATE_SET, PUBLIC_STATUS_BAR_VISIBILITY_MASK, ROTATION, ROTATION_X, ROTATION_Y, SCALE_X, SCALE_Y, SCREEN_STATE_OFF, SCREEN_STATE_ON, SCROLLBAR_POSITION_DEFAULT, SCROLLBAR_POSITION_LEFT, SCROLLBAR_POSITION_RIGHT, SCROLLBARS_INSIDE_INSET, SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_OUTSIDE_INSET, SCROLLBARS_OUTSIDE_OVERLAY, SELECTED_STATE_SET, SELECTED_WINDOW_FOCUSED_STATE_SET, SOUND_EFFECTS_ENABLED, STATUS_BAR_DISABLE_BACK, STATUS_BAR_DISABLE_CLOCK, STATUS_BAR_DISABLE_EXPAND, STATUS_BAR_DISABLE_HOME, STATUS_BAR_DISABLE_NOTIFICATION_ALERTS, STATUS_BAR_DISABLE_NOTIFICATION_ICONS, STATUS_BAR_DISABLE_NOTIFICATION_TICKER, STATUS_BAR_DISABLE_RECENT, STATUS_BAR_DISABLE_SEARCH, STATUS_BAR_DISABLE_SYSTEM_INFO, STATUS_BAR_HIDDEN, STATUS_BAR_VISIBLE, SYSTEM_UI_CLEARABLE_FLAGS, SYSTEM_UI_FLAG_FULLSCREEN, SYSTEM_UI_FLAG_HIDE_NAVIGATION, SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN, SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION, SYSTEM_UI_FLAG_LAYOUT_STABLE, SYSTEM_UI_FLAG_LOW_PROFILE, SYSTEM_UI_FLAG_VISIBLE, SYSTEM_UI_LAYOUT_FLAGS, TEXT_ALIGNMENT_CENTER, TEXT_ALIGNMENT_GRAVITY, TEXT_ALIGNMENT_INHERIT, TEXT_ALIGNMENT_TEXT_END, TEXT_ALIGNMENT_TEXT_START, TEXT_ALIGNMENT_VIEW_END, TEXT_ALIGNMENT_VIEW_START, TEXT_DIRECTION_ANY_RTL, TEXT_DIRECTION_FIRST_STRONG, TEXT_DIRECTION_INHERIT, TEXT_DIRECTION_LOCALE, TEXT_DIRECTION_LTR, TEXT_DIRECTION_RTL, TRANSLATION_X, TRANSLATION_Y, VIEW_LOG_TAG, VISIBLE, WINDOW_FOCUSED_STATE_SET, X, Y

Constructor Summary

Constructors
Constructor and Description
`ViewGroup(Context context)`
`ViewGroup(Context context, AttributeSet attrs)`
`ViewGroup(Context context, AttributeSet attrs, int defStyle)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addChildrenForAccessibility(ArrayList<View> childrenForAccessibility)` Adds the children of a given View for accessibility.
`void`	`addFocusables(ArrayList<View> views, int direction, int focusableMode)` Adds any focusable views that are descendants of this view (possibly including this view if it is focusable itself) to views.
`boolean`	`addStatesFromChildren()` Returns whether this ViewGroup's drawable states also include its children's drawable states.
`void`	`addTouchables(ArrayList<View> views)` Add any touchable views that are descendants of this view (possibly including this view if it is touchable itself) to views.
`void`	`addView(View child)` Adds a child view.
`void`	`addView(View child, int index)` Adds a child view.
`void`	`addView(View child, int width, int height)` Adds a child view with this ViewGroup's default layout parameters and the specified width and height.
`void`	`addView(View child, int index, ViewGroup.LayoutParams params)` Adds a child view with the specified layout parameters.
`void`	`addView(View child, ViewGroup.LayoutParams params)` Adds a child view with the specified layout parameters.
`protected boolean`	`addViewInLayout(View child, int index, ViewGroup.LayoutParams params)` Adds a view during layout.
`protected boolean`	`addViewInLayout(View child, int index, ViewGroup.LayoutParams params, boolean preventRequestLayout)` Adds a view during layout.
`protected void`	`attachLayoutAnimationParameters(View child, ViewGroup.LayoutParams params, int index, int count)` Subclasses should override this method to set layout animation parameters on the supplied child.
`protected void`	`attachViewToParent(View child, int index, ViewGroup.LayoutParams params)` Attaches a view to this view group.
`void`	`bringChildToFront(View child)` Change the z order of the child so it's on top of all other children
`protected boolean`	`canAnimate()` Indicates whether the view group has the ability to animate its children after the first layout.
`protected boolean`	`checkLayoutParams(ViewGroup.LayoutParams p)`
`void`	`childAccessibilityStateChanged(View child)` A child notifies its parent that its state for accessibility has changed.
`void`	`childDrawableStateChanged(View child)` If `addStatesFromChildren()` is true, refreshes this group's drawable state (to include the states from its children).
`void`	`childHasTransientStateChanged(View child, boolean childHasTransientState)` Called when a child view has changed whether or not it is tracking transient state.
`protected void`	`cleanupLayoutState(View child)` Prevents the specified child to be laid out during the next layout pass.
`void`	`clearChildFocus(View child)` Called when a child of this parent is giving up focus
`void`	`clearDisappearingChildren()` Removes any pending animations for views that have been removed.
`void`	`clearFocus()` Called when this view wants to give up focus.
`protected void`	`debug(int depth)` Prints information about this view in the log output, with the tag `View.VIEW_LOG_TAG`.
`protected void`	`detachAllViewsFromParent()` Detaches all views from the parent.
`protected void`	`detachViewFromParent(int index)` Detaches a view from its parent.
`protected void`	`detachViewFromParent(View child)` Detaches a view from its parent.
`protected void`	`detachViewsFromParent(int start, int count)` Detaches a range of views from their parents.
`void`	`dispatchConfigurationChanged(Configuration newConfig)` Dispatch a notification about a resource configuration change down the view hierarchy.
`void`	`dispatchDisplayHint(int hint)` Dispatch a hint about whether this view is displayed.
`boolean`	`dispatchDragEvent(DragEvent event)` Detects if this View is enabled and has a drag event listener.
`protected void`	`dispatchDraw(Canvas canvas)` Called by draw to draw the child views.
`void`	`dispatchFinishTemporaryDetach()`
`protected void`	`dispatchFreezeSelfOnly(SparseArray<Parcelable> container)` Perform dispatching of a `View.saveHierarchyState(android.util.SparseArray)` freeze()} to only this view, not to its children.
`protected boolean`	`dispatchGenericFocusedEvent(MotionEvent event)` Dispatch a generic motion event to the currently focused view.
`protected boolean`	`dispatchGenericPointerEvent(MotionEvent event)` Dispatch a generic motion event to the view under the first pointer.
`protected void`	`dispatchGetDisplayList()` This method is used to cause children of this ViewGroup to restore or recreate their display lists.
`protected boolean`	`dispatchHoverEvent(MotionEvent event)` Dispatch a hover event.
`boolean`	`dispatchKeyEvent(KeyEvent event)` Dispatch a key event to the next view on the focus path.
`boolean`	`dispatchKeyEventPreIme(KeyEvent event)` Dispatch a key event before it is processed by any input method associated with the view hierarchy.
`boolean`	`dispatchKeyShortcutEvent(KeyEvent event)` Dispatches a key shortcut event.
`protected void`	`dispatchRestoreInstanceState(SparseArray<Parcelable> container)` Called by `View.restoreHierarchyState(android.util.SparseArray)` to retrieve the state for this view and its children.
`protected void`	`dispatchSaveInstanceState(SparseArray<Parcelable> container)` Called by `View.saveHierarchyState(android.util.SparseArray)` to store the state for this view and its children.
`void`	`dispatchSetActivated(boolean activated)` Dispatch setActivated to all of this View's children.
`protected void`	`dispatchSetPressed(boolean pressed)` Dispatch setPressed to all of this View's children.
`void`	`dispatchSetSelected(boolean selected)` Dispatch setSelected to all of this View's children.
`void`	`dispatchStartTemporaryDetach()`
`void`	`dispatchSystemUiVisibilityChanged(int visible)` Dispatch callbacks to `View.setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener)` down the view hierarchy.
`protected void`	`dispatchThawSelfOnly(SparseArray<Parcelable> container)` Perform dispatching of a `View.restoreHierarchyState(android.util.SparseArray)` to only this view, not to its children.
`boolean`	`dispatchTouchEvent(MotionEvent ev)` Pass the touch screen motion event down to the target view, or this view if it is the target.
`boolean`	`dispatchTrackballEvent(MotionEvent event)` Pass a trackball motion event down to the focused view.
`boolean`	`dispatchUnhandledMove(View focused, int direction)` This method is the last chance for the focused view and its ancestors to respond to an arrow key.
`protected void`	`dispatchVisibilityChanged(View changedView, int visibility)` Dispatch a view visibility change down the view hierarchy.
`void`	`dispatchWindowFocusChanged(boolean hasFocus)` Called when the window containing this view gains or loses window focus.
`void`	`dispatchWindowSystemUiVisiblityChanged(int visible)` Dispatch callbacks to `View.onWindowSystemUiVisibilityChanged(int)` down the view hierarchy.
`void`	`dispatchWindowVisibilityChanged(int visibility)` Dispatch a window visibility change down the view hierarchy.
`protected void`	`drawableStateChanged()` This function is called whenever the state of the view changes in such a way that it impacts the state of drawables being shown.
`protected boolean`	`drawChild(Canvas canvas, View child, long drawingTime)` Draw one child of this View Group.
`void`	`endViewTransition(View view)` This method should always be called following an earlier call to `startViewTransition(View)`.
`View`	`findFocus()` Find the view in the hierarchy rooted at this view that currently has focus.
`protected View`	`findViewByPredicateTraversal(com.android.internal.util.Predicate<View> predicate, View childToSkip)`
`void`	`findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags)` Finds the Views that contain given text.
`protected View`	`findViewTraversal(int id)`
`protected View`	`findViewWithTagTraversal(Object tag)`
`protected boolean`	`fitSystemWindows(Rect insets)` 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.
`void`	`focusableViewAvailable(View v)` Tells the parent that a new focusable view has become available.
`View`	`focusSearch(View focused, int direction)` Find the nearest view in the specified direction that wants to take focus.
`boolean`	`gatherTransparentRegion(Region region)` This is used by the RootView to perform an optimization when the view hierarchy contains one or several SurfaceView.
`protected ViewGroup.LayoutParams`	`generateDefaultLayoutParams()` Returns a set of default layout parameters.
`ViewGroup.LayoutParams`	`generateLayoutParams(AttributeSet attrs)` Returns a new set of layout parameters based on the supplied attributes set.
`protected ViewGroup.LayoutParams`	`generateLayoutParams(ViewGroup.LayoutParams p)` Returns a safe set of layout parameters based on the supplied layout params.
`View`	`getChildAt(int index)` Returns the view at the specified position in the group.
`int`	`getChildCount()` Returns the number of children in the group.
`protected int`	`getChildDrawingOrder(int childCount, int i)` Returns the index of the child to draw for this iteration.
`static int`	`getChildMeasureSpec(int spec, int padding, int childDimension)` Does the hard part of measureChildren: figuring out the MeasureSpec to pass to a particular child.
`protected boolean`	`getChildStaticTransformation(View child, Transformation t)` Sets `t` to be the static transformation of the child, if set, returning a boolean to indicate whether a static transform was set.
`boolean`	`getChildVisibleRect(View child, Rect r, Point offset)` Compute the visible part of a rectangular region defined in terms of a child view's coordinates.
`int`	`getDescendantFocusability()` Gets the descendant focusability of this view group.
`View`	`getFocusedChild()` Returns the focused child of this view, if any.
`LayoutAnimationController`	`getLayoutAnimation()` Returns the layout animation controller used to animate the group's children.
`Animation.AnimationListener`	`getLayoutAnimationListener()` Returns the animation listener to which layout animation events are sent.
`int`	`getLayoutMode()` Returns the basis of alignment during layout operations on this view group: either `CLIP_BOUNDS` or `OPTICAL_BOUNDS`.
`LayoutTransition`	`getLayoutTransition()` Gets the LayoutTransition object for this ViewGroup.
`int`	`getPersistentDrawingCache()` Returns an integer indicating what types of drawing caches are kept in memory.
`boolean`	`hasFocus()` Returns true if this view has or contains focus
`boolean`	`hasFocusable()` Returns true if this view is focusable or if it contains a reachable View for which `View.hasFocusable()` returns true.
`protected boolean`	`hasHoveredChild()` Returns true if the view has a child to which it has recently sent `MotionEvent.ACTION_HOVER_ENTER`.
`boolean`	`hasTransientState()` 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.
`int`	`indexOfChild(View child)` Returns the position in the group of the specified child view.
`protected void`	`internalSetPadding(int left, int top, int right, int bottom)`
`void`	`invalidateChild(View child, Rect dirty)` Don't call or override this method.
`void`	`invalidateChildFast(View child, Rect dirty)` Quick invalidation method called by View.invalidateViewProperty.
`ViewParent`	`invalidateChildInParent(int[] location, Rect dirty)` Don't call or override this method.
`boolean`	`isAlwaysDrawnWithCacheEnabled()` Indicates whether this ViewGroup will always try to draw its children using their drawing cache.
`boolean`	`isAnimationCacheEnabled()` Indicates whether the children's drawing cache is used during a layout animation.
`protected boolean`	`isChildrenDrawingOrderEnabled()` Indicates whether the ViewGroup is drawing its children in the order defined by `getChildDrawingOrder(int, int)`.
`protected boolean`	`isChildrenDrawnWithCacheEnabled()` Indicates whether the ViewGroup is currently drawing its children using their drawing cache.
`boolean`	`isMotionEventSplittingEnabled()` Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children.
`protected boolean`	`isTransformedTouchPointInView(float x, float y, View child, PointF outLocalPoint)` Returns true if a child view contains the specified point when transformed into its coordinate space.
`void`	`jumpDrawablesToCurrentState()` Call `Drawable.jumpToCurrentState()` on all Drawable objects associated with this view.
`void`	`layout(int l, int t, int r, int b)` Assign a size and position to a view and all of its descendants
`void`	`makeOptionalFitsSystemWindows()` For use by PhoneWindow to make its own system window fitting optional.
`protected void`	`measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec)` Ask one of the children of this view to measure itself, taking into account both the MeasureSpec requirements for this view and its padding.
`protected void`	`measureChildren(int widthMeasureSpec, int heightMeasureSpec)` Ask all of the children of this view to measure themselves, taking into account both the MeasureSpec requirements for this view and its padding.
`protected void`	`measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed)` 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.
`void`	`offsetChildrenTopAndBottom(int offset)` Offset the vertical location of all children of this view by the specified number of pixels.
`void`	`offsetDescendantRectToMyCoords(View descendant, Rect rect)` Offset a rectangle that is in a descendant's coordinate space into our coordinate space.
`void`	`offsetRectIntoDescendantCoords(View descendant, Rect rect)` Offset a rectangle that is in our coordinate space into an ancestor's coordinate space.
`protected void`	`onAnimationEnd()` Invoked by a parent ViewGroup to notify the end of the animation currently associated with this view.
`protected void`	`onAnimationStart()` Invoked by a parent ViewGroup to notify the start of the animation currently associated with this view.
`protected void`	`onChildVisibilityChanged(View child, int oldVisibility, int newVisibility)` Called when a view's visibility has changed.
`protected int[]`	`onCreateDrawableState(int extraSpace)` Generate the new `Drawable` state for this view.
`protected void`	`onDebugDraw(Canvas canvas)`
`protected void`	`onDebugDrawMargins(Canvas canvas)`
`boolean`	`onInterceptHoverEvent(MotionEvent event)` Implement this method to intercept hover events before they are handled by child views.
`boolean`	`onInterceptTouchEvent(MotionEvent ev)` Implement this method to intercept all touch screen motion events.
`protected abstract void`	`onLayout(boolean changed, int l, int t, int r, int b)` Called from layout when this view should assign a size and position to each of its children.
`protected boolean`	`onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect)` Look for a descendant to call `View.requestFocus()` on.
`boolean`	`onRequestSendAccessibilityEvent(View child, AccessibilityEvent event)` Called when a child has requested sending an `AccessibilityEvent` and gives an opportunity to its parent to augment the event.
`protected void`	`onSetLayoutParams(View child, ViewGroup.LayoutParams layoutParams)`
`protected void`	`onViewAdded(View child)`
`protected void`	`onViewRemoved(View child)`
`void`	`recomputeViewAttributes(View child)` Tell view hierarchy that the global view attributes need to be re-evaluated.
`void`	`removeAllViews()` Call this method to remove all child views from the ViewGroup.
`void`	`removeAllViewsInLayout()` 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.
`protected void`	`removeDetachedView(View child, boolean animate)` Finishes the removal of a detached view.
`void`	`removeView(View view)`
`void`	`removeViewAt(int index)` Removes the view at the specified position in the group.
`void`	`removeViewInLayout(View view)` Removes a view during layout.
`void`	`removeViews(int start, int count)` Removes the specified range of views from the group.
`void`	`removeViewsInLayout(int start, int count)` Removes a range of views during layout.
`void`	`requestChildFocus(View child, View focused)` Called when a child of this parent wants focus
`boolean`	`requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate)` Called when a child of this group wants a particular rectangle to be positioned onto the screen.
`void`	`requestDisallowInterceptTouchEvent(boolean disallowIntercept)` Called when a child does not want this parent and its ancestors to intercept touch events with `onInterceptTouchEvent(MotionEvent)`.
`boolean`	`requestFocus(int direction, Rect previouslyFocusedRect)` 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.
`boolean`	`requestSendAccessibilityEvent(View child, AccessibilityEvent event)` Called by a child to request from its parent to send an `AccessibilityEvent`.
`void`	`requestTransitionStart(LayoutTransition transition)` This method is called by LayoutTransition when there are 'changing' animations that need to start after the layout/setup phase.
`void`	`requestTransparentRegion(View child)` Called when a child wants the view hierarchy to gather and report transparent regions to the window compositor.
`void`	`resetAccessibilityStateChanged()` Reset the state indicating the this view has requested clients interested in its accessibility state to be notified.
`protected void`	`resetResolvedDrawables()`
`void`	`resetResolvedLayoutDirection()` Reset the resolved layout direction.
`void`	`resetResolvedPadding()` Reset the resolved layout direction.
`void`	`resetResolvedTextAlignment()` Reset resolved text alignment.
`void`	`resetResolvedTextDirection()` Reset resolved text direction.
`void`	`resetRtlProperties()` Reset resolution of all RTL related properties.
`protected void`	`resolveDrawables()` Resolve the Drawables depending on the layout direction.
`boolean`	`resolveLayoutDirection()` Resolve and cache the layout direction.
`void`	`resolveLayoutParams()` Resolve the layout parameters depending on the resolved layout direction
`void`	`resolvePadding()` Resolve padding depending on layout direction.
`void`	`resolveRtlPropertiesIfNeeded()` Resolve all RTL related properties.
`boolean`	`resolveTextAlignment()` Resolve the text alignment.
`boolean`	`resolveTextDirection()` Resolve the text direction.
`void`	`scheduleLayoutAnimation()` Schedules the layout animation to be played after the next layout pass of this view group.
`void`	`setAddStatesFromChildren(boolean addsStates)` Sets whether this ViewGroup's drawable states also include its children's drawable states.
`void`	`setAlwaysDrawnWithCacheEnabled(boolean always)` Indicates whether this ViewGroup will always try to draw its children using their drawing cache.
`void`	`setAnimationCacheEnabled(boolean enabled)` Enables or disables the children's drawing cache during a layout animation.
`protected void`	`setChildrenDrawingCacheEnabled(boolean enabled)` Enables or disables the drawing cache for each child of this view group.
`protected void`	`setChildrenDrawingOrderEnabled(boolean enabled)` Tells the ViewGroup whether to draw its children in the order defined by the method `getChildDrawingOrder(int, int)`.
`protected void`	`setChildrenDrawnWithCacheEnabled(boolean enabled)` Tells the ViewGroup to draw its children using their drawing cache.
`void`	`setClipChildren(boolean clipChildren)` By default, children are clipped to their bounds before drawing.
`void`	`setClipToPadding(boolean clipToPadding)` By default, children are clipped to the padding of the ViewGroup.
`void`	`setDescendantFocusability(int focusability)` Set the descendant focusability of this view group.
`void`	`setLayoutAnimation(LayoutAnimationController controller)` Sets the layout animation controller used to animate the group's children after the first layout.
`void`	`setLayoutAnimationListener(Animation.AnimationListener animationListener)` Specifies the animation listener to which layout animation events must be sent.
`void`	`setLayoutMode(int layoutMode)` Sets the basis of alignment during the layout of this view group.
`void`	`setLayoutTransition(LayoutTransition transition)` Sets the LayoutTransition object for this ViewGroup.
`void`	`setMotionEventSplittingEnabled(boolean split)` Enable or disable the splitting of MotionEvents to multiple children during touch event dispatch.
`void`	`setOnHierarchyChangeListener(ViewGroup.OnHierarchyChangeListener listener)` Register a callback to be invoked when a child is added to or removed from this view.
`void`	`setPersistentDrawingCache(int drawingCacheToKeep)` Indicates what types of drawing caches should be kept in memory after they have been created.
`protected void`	`setStaticTransformationsEnabled(boolean enabled)` When this property is set to true, this ViewGroup supports static transformations on children; this causes `getChildStaticTransformation(View, android.view.animation.Transformation)` to be invoked when a child is drawn.
`boolean`	`shouldDelayChildPressedState()` Return true if the pressed state should be delayed for children or descendants of this ViewGroup.
`boolean`	`showContextMenuForChild(View originalView)` Bring up a context menu for the specified view or its ancestors.
`ActionMode`	`startActionModeForChild(View originalView, ActionMode.Callback callback)` Start an action mode for the specified view.
`void`	`startLayoutAnimation()` Runs the layout animation.
`void`	`startViewTransition(View 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.
`void`	`updateViewLayout(View view, ViewGroup.LayoutParams params)`

Methods inherited from class android.view.View
addFocusables, addOnAttachStateChangeListener, addOnLayoutChangeListener, animate, announceForAccessibility, applyDrawableToTransparentRegion, awakenScrollBars, awakenScrollBars, awakenScrollBars, bringToFront, buildDrawingCache, buildDrawingCache, buildLayer, callOnClick, cancelLongPress, canHaveDisplayList, canResolveLayoutDirection, canScrollHorizontally, canScrollVertically, checkInputConnectionProxy, clearAccessibilityFocus, clearAnimation, combineMeasuredStates, computeHorizontalScrollExtent, computeHorizontalScrollOffset, computeHorizontalScrollRange, computeOpaqueFlags, computeScroll, computeVerticalScrollExtent, computeVerticalScrollOffset, computeVerticalScrollRange, createAccessibilityNodeInfo, createContextMenu, debug, debugIndent, destroyDrawingCache, destroyHardwareResources, dispatchGenericMotionEvent, dispatchPointerEvent, dispatchPopulateAccessibilityEvent, draw, findViewById, findViewByPredicate, findViewByPredicateInsideOut, findViewWithTag, fitsSystemWindows, focusSearch, forceLayout, generateViewId, getAccessibilityCursorPosition, getAccessibilityDelegate, getAccessibilityNodeProvider, getAccessibilityViewId, getAccessibilityWindowId, getAlpha, getAnimation, getApplicationWindowToken, getBackground, getBaseline, getBottom, getBottomFadingEdgeStrength, getBottomPaddingOffset, getCameraDistance, getContentDescription, getContext, getContextMenuInfo, getDefaultSize, getDisplay, getDisplayList, getDrawableState, getDrawingCache, getDrawingCache, getDrawingCacheBackgroundColor, getDrawingCacheQuality, getDrawingRect, getDrawingTime, getFadeHeight, getFadeTop, getFilterTouchesWhenObscured, getFitsSystemWindows, getFocusables, getFocusedRect, getGlobalVisibleRect, getGlobalVisibleRect, getHandler, getHardwareRenderer, getHeight, getHitRect, getHorizontalFadingEdgeLength, getHorizontalScrollbarHeight, getHorizontalScrollFactor, getId, getImportantForAccessibility, getIterableTextForAccessibility, getIteratorForGranularity, getKeepScreenOn, getKeyDispatcherState, getLabelFor, getLayerType, getLayoutDirection, getLayoutParams, getLeft, getLeftFadingEdgeStrength, getLeftPaddingOffset, getLocalVisibleRect, getLocationInWindow, getLocationOnScreen, getMatrix, getMeasuredHeight, getMeasuredHeightAndState, getMeasuredState, getMeasuredWidth, getMeasuredWidthAndState, getMinimumHeight, getMinimumWidth, getNextFocusDownId, getNextFocusForwardId, getNextFocusLeftId, getNextFocusRightId, getNextFocusUpId, getOnFocusChangeListener, getOpticalInsets, getOverScrollMode, getPaddingBottom, getPaddingEnd, getPaddingLeft, getPaddingRight, getPaddingStart, getPaddingTop, getParent, getParentForAccessibility, getPivotX, getPivotY, getRawLayoutDirection, getRawTextAlignment, getRawTextDirection, getResources, getRight, getRightFadingEdgeStrength, getRightPaddingOffset, getRootView, getRotation, getRotationX, getRotationY, getScaleX, getScaleY, getScrollBarDefaultDelayBeforeFade, getScrollBarFadeDuration, getScrollBarSize, getScrollBarStyle, getScrollX, getScrollY, getSolidColor, getSuggestedMinimumHeight, getSuggestedMinimumWidth, getSystemUiVisibility, getTag, getTag, getTextAlignment, getTextDirection, getTop, getTopFadingEdgeStrength, getTopPaddingOffset, getTouchables, getTouchDelegate, getTranslationX, getTranslationY, getVerticalFadingEdgeLength, getVerticalScrollbarPosition, getVerticalScrollbarWidth, getVerticalScrollFactor, getViewRootImpl, getViewTreeObserver, getVisibility, getWidth, getWindowAttachCount, getWindowSystemUiVisibility, getWindowToken, getWindowVisibility, getWindowVisibleDisplayFrame, getX, getY, hackTurnOffWindowResizeAnim, hasOnClickListeners, hasOpaqueScrollbars, hasOverlappingRendering, hasWindowFocus, includeForAccessibility, inflate, initializeFadingEdge, initializeScrollbars, invalidate, invalidate, invalidate, invalidateDrawable, invalidateParentCaches, invalidateParentIfNeeded, isActionableForAccessibility, isActivated, isClickable, isDirty, isDrawingCacheEnabled, isDuplicateParentStateEnabled, isEnabled, isFocusable, isFocusableInTouchMode, isFocused, isHapticFeedbackEnabled, isHardwareAccelerated, isHorizontalFadingEdgeEnabled, isHorizontalScrollBarEnabled, isHovered, isImportantForAccessibility, isInEditMode, isInScrollingContainer, isInTouchMode, isLayoutDirectionInherited, isLayoutRequested, isLayoutRtl, isLongClickable, isOpaque, isPaddingOffsetRequired, isPaddingRelative, isPressed, isRootNamespace, isSaveEnabled, isSaveFromParentEnabled, isScrollbarFadingEnabled, isScrollContainer, isSelected, isShown, isSoundEffectsEnabled, isTextAlignmentInherited, isTextDirectionInherited, isVerticalFadingEdgeEnabled, isVerticalScrollBarEnabled, isVerticalScrollBarHidden, isVisibleToUser, isVisibleToUser, measure, mergeDrawableStates, notifyAccessibilityStateChanged, offsetLeftAndRight, offsetTopAndBottom, onAttachedToWindow, onCheckIsTextEditor, onCloseSystemDialogs, onConfigurationChanged, onCreateContextMenu, onCreateInputConnection, onDetachedFromWindow, onDisplayHint, onDragEvent, onDraw, onDrawHorizontalScrollBar, onDrawScrollBars, onDrawVerticalScrollBar, onFilterTouchEventForSecurity, onFinishInflate, onFinishTemporaryDetach, onFocusChanged, onFocusLost, onGenericMotionEvent, onHoverChanged, onHoverEvent, onInitializeAccessibilityEvent, onInitializeAccessibilityNodeInfo, onKeyDown, onKeyLongPress, onKeyMultiple, onKeyPreIme, onKeyShortcut, onKeyUp, onMeasure, onOverScrolled, onPopulateAccessibilityEvent, onResolveDrawables, onRestoreInstanceState, onRtlPropertiesChanged, onSaveInstanceState, onScreenStateChanged, onScrollChanged, onSetAlpha, onSizeChanged, onStartTemporaryDetach, onTouchEvent, onTrackballEvent, onVisibilityChanged, onWindowFocusChanged, onWindowSystemUiVisibilityChanged, onWindowVisibilityChanged, outputDirtyFlags, overScrollBy, performAccessibilityAction, performButtonActionOnTouchDown, performClick, performHapticFeedback, performHapticFeedback, performLongClick, playSoundEffect, post, postDelayed, postInvalidate, postInvalidate, postInvalidateDelayed, postInvalidateDelayed, postInvalidateOnAnimation, postInvalidateOnAnimation, postOnAnimation, postOnAnimationDelayed, recomputePadding, refreshDrawableState, removeCallbacks, removeOnAttachStateChangeListener, removeOnLayoutChangeListener, requestAccessibilityFocus, requestFitSystemWindows, requestFocus, requestFocus, requestFocusFromTouch, requestLayout, requestRectangleOnScreen, requestRectangleOnScreen, resetPaddingToInitialValues, resolveSize, resolveSizeAndState, restoreHierarchyState, saveHierarchyState, scheduleDrawable, scrollBy, scrollTo, sendAccessibilityEvent, sendAccessibilityEventUnchecked, setAccessibilityCursorPosition, setAccessibilityDelegate, setActivated, setAlpha, setAnimation, setBackground, setBackgroundColor, setBackgroundDrawable, setBackgroundResource, setBottom, setCameraDistance, setClickable, setContentDescription, setDisabledSystemUiVisibility, setDrawingCacheBackgroundColor, setDrawingCacheEnabled, setDrawingCacheQuality, setDuplicateParentStateEnabled, setEnabled, setFadingEdgeLength, setFilterTouchesWhenObscured, setFitsSystemWindows, setFocusable, setFocusableInTouchMode, setFrame, setHapticFeedbackEnabled, setHasTransientState, setHorizontalFadingEdgeEnabled, setHorizontalScrollBarEnabled, setHovered, setId, setImportantForAccessibility, setIsRootNamespace, setKeepScreenOn, setLabelFor, setLayerPaint, setLayerType, setLayoutDirection, setLayoutInsets, setLayoutParams, setLeft, setLongClickable, setMeasuredDimension, setMinimumHeight, setMinimumWidth, setNextFocusDownId, setNextFocusForwardId, setNextFocusLeftId, setNextFocusRightId, setNextFocusUpId, setOnClickListener, setOnCreateContextMenuListener, setOnDragListener, setOnFocusChangeListener, setOnGenericMotionListener, setOnHoverListener, setOnKeyListener, setOnLongClickListener, setOnSystemUiVisibilityChangeListener, setOnTouchListener, setOverScrollMode, setPadding, setPaddingRelative, setPivotX, setPivotY, setPressed, setRight, setRotation, setRotationX, setRotationY, setSaveEnabled, setSaveFromParentEnabled, setScaleX, setScaleY, setScrollBarDefaultDelayBeforeFade, setScrollBarFadeDuration, setScrollbarFadingEnabled, setScrollBarSize, setScrollBarStyle, setScrollContainer, setScrollX, setScrollY, setSelected, setSoundEffectsEnabled, setSystemUiVisibility, setTag, setTag, setTagInternal, setTextAlignment, setTextDirection, setTop, setTouchDelegate, setTranslationX, setTranslationY, setVerticalFadingEdgeEnabled, setVerticalScrollBarEnabled, setVerticalScrollbarPosition, setVisibility, setWillNotCacheDrawing, setWillNotDraw, setX, setY, showContextMenu, showContextMenu, startActionMode, startAnimation, startDrag, toString, unscheduleDrawable, unscheduleDrawable, verifyDrawable, willNotCacheDrawing, willNotDraw

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface android.view.ViewParent
createContextMenu, getParent, getParentForAccessibility, isLayoutRequested, requestFitSystemWindows, requestLayout

- Field Detail
  - mDisappearingChildren
```
protected ArrayList<View> mDisappearingChildren
```
    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.
  - mOnHierarchyChangeListener
```
protected ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener
```
    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.
  - mGroupFlags
```
protected int mGroupFlags
```
    Internal flags. This field should be made private, so it is hidden from the SDK.
  - FLAG_USE_CHILD_DRAWING_ORDER
```
protected static final int FLAG_USE_CHILD_DRAWING_ORDER
```
    When set, the drawing method will call getChildDrawingOrder(int, int) to get the index of the child to draw for that iteration.
    
    See Also:
    Constant Field Values
  - FLAG_SUPPORT_STATIC_TRANSFORMATIONS
```
protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS
```
    When set, this ViewGroup supports static transformations on children; this causes getChildStaticTransformation(View, android.view.animation.Transformation) to be invoked when a child is drawn. Any subclass overriding getChildStaticTransformation(View, android.view.animation.Transformation) should set this flags in mGroupFlags.
    
    See Also:
    Constant Field Values
  - FOCUS_BEFORE_DESCENDANTS
```
public static final int FOCUS_BEFORE_DESCENDANTS
```
    This view will get focus before any of its descendants.
    
    See Also:
    Constant Field Values
  - FOCUS_AFTER_DESCENDANTS
```
public static final int FOCUS_AFTER_DESCENDANTS
```
    This view will get focus only if none of its descendants want it.
    
    See Also:
    Constant Field Values
  - FOCUS_BLOCK_DESCENDANTS
```
public static final int FOCUS_BLOCK_DESCENDANTS
```
    This view will block any of its descendants from getting focus, even if they are focusable.
    
    See Also:
    Constant Field Values
  - FLAG_DISALLOW_INTERCEPT
```
protected static final int FLAG_DISALLOW_INTERCEPT
```
    When set, this ViewGroup should not intercept touch events.
    
    See Also:
    Constant Field Values
  - mPersistentDrawingCache
```
protected int mPersistentDrawingCache
```
    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.
  - PERSISTENT_NO_CACHE
```
public static final int PERSISTENT_NO_CACHE
```
    Used to indicate that no drawing cache should be kept in memory.
    
    See Also:
    Constant Field Values
  - PERSISTENT_ANIMATION_CACHE
```
public static final int PERSISTENT_ANIMATION_CACHE
```
    Used to indicate that the animation drawing cache should be kept in memory.
    
    See Also:
    Constant Field Values
  - PERSISTENT_SCROLLING_CACHE
```
public static final int PERSISTENT_SCROLLING_CACHE
```
    Used to indicate that the scrolling drawing cache should be kept in memory.
    
    See Also:
    Constant Field Values
  - PERSISTENT_ALL_CACHES
```
public static final int PERSISTENT_ALL_CACHES
```
    Used to indicate that all drawing caches should be kept in memory.
    
    See Also:
    Constant Field Values
  - CLIP_BOUNDS
```
public static final int CLIP_BOUNDS
```
    This constant is a layoutMode. Clip bounds are the raw values of left, top, right and bottom.
    
    See Also:
    Constant Field Values
  - OPTICAL_BOUNDS
```
public static final int OPTICAL_BOUNDS
```
    This constant is a 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.
    
    See Also:
    Constant Field Values
  - CLIP_TO_PADDING_MASK
```
protected static final int CLIP_TO_PADDING_MASK
```
    We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL are set at the same time.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - ViewGroup
```
public ViewGroup(Context context)
```
  - ViewGroup
```
public ViewGroup(Context context,
         AttributeSet attrs)
```
  - ViewGroup
```
public ViewGroup(Context context,
         AttributeSet attrs,
         int defStyle)
```
- Method Detail
  - getDescendantFocusability
```
public int getDescendantFocusability()
```
    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 requestFocus(int, android.graphics.Rect).
    
    Returns:
    one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS.
  - setDescendantFocusability
```
public void setDescendantFocusability(int 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 requestFocus(int, android.graphics.Rect).
    
    Parameters:
    focusability - one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS.
  - requestChildFocus
```
public void requestChildFocus(View child,
                     View focused)
```
    Called when a child of this parent wants focus
    
    Specified by:
    
    requestChildFocus in interface ViewParent
    
    Parameters:
    child - The child of this ViewParent that wants focus. This view will contain the focused view. It is not necessarily the view that actually has focus.
    focused - The view that is a descendant of child that actually has focus
  - focusableViewAvailable
```
public void focusableViewAvailable(View v)
```
    Tells the parent that a new focusable view has become available. This is to handle transitions from the case where there are no focusable views to the case where the first focusable view appears.
    
    Specified by:
    
    focusableViewAvailable in interface ViewParent
    
    Parameters:
    v - The view that has become newly focusable
  - showContextMenuForChild
```
public boolean showContextMenuForChild(View originalView)
```
    Bring up a context menu for the specified view or its ancestors.
    In most cases, a subclass does not need to override this. However, if the subclass is added directly to the window manager (for example, ViewManager.addView(View, android.view.ViewGroup.LayoutParams)) then it should override this and show the context menu.
    
    Specified by:
    
    showContextMenuForChild in interface ViewParent
    
    Parameters:
    originalView - The source view where the context menu was first invoked
    
    Returns:
    true if a context menu was displayed
  - startActionModeForChild
```
public ActionMode startActionModeForChild(View originalView,
                                 ActionMode.Callback callback)
```
    Start an action mode for the specified view.
    In most cases, a subclass does not need to override this. However, if the subclass is added directly to the window manager (for example, ViewManager.addView(View, android.view.ViewGroup.LayoutParams)) then it should override this and start the action mode.
    
    Specified by:
    
    startActionModeForChild in interface ViewParent
    
    Parameters:
    originalView - The source view where the action mode was first invoked
    callback - The callback that will handle lifecycle events for the action mode
    
    Returns:
    The new action mode if it was started, null otherwise
  - focusSearch
```
public View focusSearch(View focused,
               int direction)
```
    Find the nearest view in the specified direction that wants to take focus.
    
    Specified by:
    
    focusSearch in interface ViewParent
    
    Parameters:
    focused - The view that currently has focus
    direction - One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT, or 0 for not applicable.
  - requestChildRectangleOnScreen
```
public boolean requestChildRectangleOnScreen(View child,
                                    Rect rectangle,
                                    boolean immediate)
```
    Called when a child of this group wants a particular rectangle to be positioned onto the screen. ViewGroups overriding this can trust that:
    - child will be a direct child of this group
    - rectangle will be in the child's coordinates
    ViewGroups overriding this should uphold the contract:
    - nothing will change if the rectangle is already visible
    - the view port will be scrolled only just enough to make the rectangle visible
    Specified by:
    
    requestChildRectangleOnScreen in interface ViewParent
    
    Parameters:
    child - The direct child making the request.
    rectangle - The rectangle in the child's coordinates the child wishes to be on the screen.
    immediate - True to forbid animated or delayed scrolling, false otherwise
    
    Returns:
    Whether the group scrolled to handle the operation
  - requestSendAccessibilityEvent
```
public boolean requestSendAccessibilityEvent(View child,
                                    AccessibilityEvent event)
```
    Called by a child to request from its parent to send an AccessibilityEvent. The child has already populated a record for itself in the event and is delegating to its parent to send the event. The parent can optionally add a record for itself.
    Note: An accessibility event is fired by an individual view which populates the event with a record for its state and requests from its parent to perform the sending. The parent can optionally add a record for itself before dispatching the request to its parent. A parent can also choose not to respect the request for sending the event. The accessibility event is sent by the topmost view in the view tree.
    
    Specified by:
    
    requestSendAccessibilityEvent in interface ViewParent
    
    Parameters:
    child - The child which requests sending the event.
    event - The event to be sent.
    
    Returns:
    True if the event was sent.
  - onRequestSendAccessibilityEvent
```
public boolean onRequestSendAccessibilityEvent(View child,
                                      AccessibilityEvent event)
```
    Called when a child has requested sending an AccessibilityEvent and gives an opportunity to its parent to augment the event.
    If an View.AccessibilityDelegate has been specified via calling View.setAccessibilityDelegate(android.view.View.AccessibilityDelegate) its View.AccessibilityDelegate.onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent) is responsible for handling this call.
    
    Parameters:
    child - The child which requests sending the event.
    event - The event to be sent.
    
    Returns:
    True if the event should be sent.
    See Also:
    requestSendAccessibilityEvent(View, AccessibilityEvent)
  - childHasTransientStateChanged
```
public void childHasTransientStateChanged(View child,
                                 boolean childHasTransientState)
```
    Called when a child view has changed whether or not it is tracking transient state.
    
    Specified by:
    
    childHasTransientStateChanged in interface ViewParent
    
    Parameters:
    child - Child view whose state has changed
    childHasTransientState - true if this child has transient state
  - hasTransientState
```
public boolean hasTransientState()
```
    Description copied from class: View
    
    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.
    
    Overrides:
    
    hasTransientState in class View
    
    Returns:
    true if the view has transient state
  - dispatchUnhandledMove
```
public boolean dispatchUnhandledMove(View focused,
                            int direction)
```
    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.
    
    Overrides:
    
    dispatchUnhandledMove in class View
    
    Parameters:
    focused - The currently focused view.
    direction - The direction focus wants to move. One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT.
    
    Returns:
    True if the this view consumed this unhandled move.
  - clearChildFocus
```
public void clearChildFocus(View child)
```
    Called when a child of this parent is giving up focus
    
    Specified by:
    
    clearChildFocus in interface ViewParent
    
    Parameters:
    child - The view that is giving up focus
  - clearFocus
```
public void clearFocus()
```
    Called when this view wants to give up focus. If focus is cleared View.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.
    
    Overrides:
    
    clearFocus in class View
  - getFocusedChild
```
public View getFocusedChild()
```
    Returns the focused child of this view, if any. The child may have focus or contain focus.
    
    Returns:
    the focused child or null.
  - hasFocus
```
public boolean hasFocus()
```
    Returns true if this view has or contains focus
    
    Overrides:
    
    hasFocus in class View
    
    Returns:
    true if this view has or contains focus
  - findFocus
```
public View findFocus()
```
    Description copied from class: View
    
    Find the view in the hierarchy rooted at this view that currently has focus.
    
    Overrides:
    
    findFocus in class View
    
    Returns:
    The view that currently has focus, or null if no focused view can be found.
  - hasFocusable
```
public boolean hasFocusable()
```
    Returns true if this view is focusable or if it contains a reachable View for which View.hasFocusable() returns true. A "reachable hasFocusable()" is a View whose parents do not block descendants focus. Only View.VISIBLE views are considered focusable.
    
    Overrides:
    
    hasFocusable in class View
    
    Returns:
    True if the view is focusable or if the view contains a focusable View, false otherwise.
    See Also:
    FOCUS_BLOCK_DESCENDANTS
  - addFocusables
```
public void addFocusables(ArrayList<View> views,
                 int direction,
                 int focusableMode)
```
    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.
    
    Overrides:
    
    addFocusables in class View
    
    Parameters:
    views - Focusable views found so far or null if all we are interested is the number of focusables.
    direction - The direction of the focus.
    focusableMode - The type of focusables to be added.
    See Also:
    View.FOCUSABLES_ALL, View.FOCUSABLES_TOUCH_MODE
  - findViewsWithText
```
public void findViewsWithText(ArrayList<View> outViews,
                     CharSequence text,
                     int flags)
```
    Description copied from class: View
    
    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 View.FIND_VIEWS_WITH_TEXT and View.FIND_VIEWS_WITH_CONTENT_DESCRIPTION flags.
    
    Overrides:
    
    findViewsWithText in class View
    
    Parameters:
    outViews - The output list of matching Views.
    text - The text to match against.
    See Also:
    View.FIND_VIEWS_WITH_TEXT, View.FIND_VIEWS_WITH_CONTENT_DESCRIPTION, View.setContentDescription(CharSequence)
  - dispatchWindowFocusChanged
```
public void dispatchWindowFocusChanged(boolean hasFocus)
```
    Called when the window containing this view gains or loses window focus. ViewGroups should override to route to their children.
    
    Overrides:
    
    dispatchWindowFocusChanged in class View
    
    Parameters:
    hasFocus - True if the window containing this view now has focus, false otherwise.
  - addTouchables
```
public void addTouchables(ArrayList<View> views)
```
    Add any touchable views that are descendants of this view (possibly including this view if it is touchable itself) to views.
    
    Overrides:
    
    addTouchables in class View
    
    Parameters:
    views - Touchable views found so far
  - makeOptionalFitsSystemWindows
```
public void makeOptionalFitsSystemWindows()
```
    Description copied from class: View
    
    For use by PhoneWindow to make its own system window fitting optional.
    
    Overrides:
    
    makeOptionalFitsSystemWindows in class View
  - dispatchDisplayHint
```
public void dispatchDisplayHint(int hint)
```
    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.
    
    Overrides:
    
    dispatchDisplayHint in class View
    
    Parameters:
    hint - A hint about whether or not this view is displayed: View.VISIBLE or View.INVISIBLE.
  - onChildVisibilityChanged
```
protected void onChildVisibilityChanged(View child,
                            int oldVisibility,
                            int newVisibility)
```
    Called when a view's visibility has changed. Notify the parent to take any appropriate action.
    
    Parameters:
    child - The view whose visibility has changed
    oldVisibility - The previous visibility value (GONE, INVISIBLE, or VISIBLE).
    newVisibility - The new visibility value (GONE, INVISIBLE, or VISIBLE).
  - dispatchVisibilityChanged
```
protected void dispatchVisibilityChanged(View changedView,
                             int visibility)
```
    Dispatch a view visibility change down the view hierarchy. ViewGroups should override to route to their children.
    
    Overrides:
    
    dispatchVisibilityChanged in class View
    
    Parameters:
    changedView - The view whose visibility changed. Could be 'this' or an ancestor view.
    visibility - The new visibility of changedView: View.VISIBLE, View.INVISIBLE or View.GONE.
  - dispatchWindowVisibilityChanged
```
public void dispatchWindowVisibilityChanged(int visibility)
```
    Dispatch a window visibility change down the view hierarchy. ViewGroups should override to route to their children.
    
    Overrides:
    
    dispatchWindowVisibilityChanged in class View
    
    Parameters:
    visibility - The new visibility of the window.
    See Also:
    View.onWindowVisibilityChanged(int)
  - dispatchConfigurationChanged
```
public void dispatchConfigurationChanged(Configuration newConfig)
```
    Dispatch a notification about a resource configuration change down the view hierarchy. ViewGroups should override to route to their children.
    
    Overrides:
    
    dispatchConfigurationChanged in class View
    
    Parameters:
    newConfig - The new resource configuration.
    See Also:
    View.onConfigurationChanged(android.content.res.Configuration)
  - recomputeViewAttributes
```
public void recomputeViewAttributes(View child)
```
    Tell view hierarchy that the global view attributes need to be re-evaluated.
    
    Specified by:
    
    recomputeViewAttributes in interface ViewParent
    
    Parameters:
    child - View whose attributes have changed.
  - bringChildToFront
```
public void bringChildToFront(View child)
```
    Change the z order of the child so it's on top of all other children
    
    Specified by:
    
    bringChildToFront in interface ViewParent
  - dispatchDragEvent
```
public boolean dispatchDragEvent(DragEvent event)
```
    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 DragEvent it received. If the drag event listener returns true, then dispatchDragEvent() returns true.
    For all other cases, the method calls the 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.
    
    Overrides:
    
    dispatchDragEvent in class View
  - dispatchWindowSystemUiVisiblityChanged
```
public void dispatchWindowSystemUiVisiblityChanged(int visible)
```
    Description copied from class: View
    
    Dispatch callbacks to View.onWindowSystemUiVisibilityChanged(int) down the view hierarchy.
    
    Overrides:
    
    dispatchWindowSystemUiVisiblityChanged in class View
  - dispatchSystemUiVisibilityChanged
```
public void dispatchSystemUiVisibilityChanged(int visible)
```
    Description copied from class: View
    
    Dispatch callbacks to View.setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) down the view hierarchy.
    
    Overrides:
    
    dispatchSystemUiVisibilityChanged in class View
  - dispatchKeyEventPreIme
```
public boolean dispatchKeyEventPreIme(KeyEvent event)
```
    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.
    
    Overrides:
    
    dispatchKeyEventPreIme in class View
    
    Parameters:
    event - The key event to be dispatched.
    
    Returns:
    True if the event was handled, false otherwise.
  - dispatchKeyEvent
```
public boolean dispatchKeyEvent(KeyEvent 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.
    
    Overrides:
    
    dispatchKeyEvent in class View
    
    Parameters:
    event - The key event to be dispatched.
    
    Returns:
    True if the event was handled, false otherwise.
  - dispatchKeyShortcutEvent
```
public boolean dispatchKeyShortcutEvent(KeyEvent event)
```
    Dispatches a key shortcut event.
    
    Overrides:
    
    dispatchKeyShortcutEvent in class View
    
    Parameters:
    event - The key event to be dispatched.
    
    Returns:
    True if the event was handled by the view, false otherwise.
  - dispatchTrackballEvent
```
public boolean dispatchTrackballEvent(MotionEvent event)
```
    Pass a trackball motion event down to the focused view.
    
    Overrides:
    
    dispatchTrackballEvent in class View
    
    Parameters:
    event - The motion event to be dispatched.
    
    Returns:
    True if the event was handled by the view, false otherwise.
  - dispatchHoverEvent
```
protected boolean dispatchHoverEvent(MotionEvent event)
```
    Dispatch a hover event.
    Do not call this method directly. Call View.dispatchGenericMotionEvent(MotionEvent) instead.
    
    Overrides:
    
    dispatchHoverEvent in class View
    
    Parameters:
    event - The motion event to be dispatched.
    
    Returns:
    True if the event was handled by the view, false otherwise.
  - hasHoveredChild
```
protected boolean hasHoveredChild()
```
    Description copied from class: View
    
    Returns true if the view has a child to which it has recently sent 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.
    
    Overrides:
    
    hasHoveredChild in class View
  - addChildrenForAccessibility
```
public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility)
```
    Description copied from class: View
    
    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 riew, rather they are the first level of descendants important for accessibility.
    
    Overrides:
    
    addChildrenForAccessibility in class View
    
    Parameters:
    childrenForAccessibility - The list of children for accessibility.
  - childAccessibilityStateChanged
```
public void childAccessibilityStateChanged(View child)
```
    Description copied from interface: ViewParent
    
    A child notifies its parent that its state for accessibility has changed. That is some of the child properties reported to accessibility services has changed, hence the interested services have to be notified for the new state.
    
    Specified by:
    
    childAccessibilityStateChanged in interface ViewParent
  - onInterceptHoverEvent
```
public boolean onInterceptHoverEvent(MotionEvent event)
```
    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 View.onHoverEvent(android.view.MotionEvent) 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 onInterceptHoverEvent(android.view.MotionEvent) 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 View.onHoverEvent(android.view.MotionEvent). 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 View.onHoverEvent(android.view.MotionEvent) and then the hovered child will receive a hover enter event.
    The default implementation always returns false.
    
    Parameters:
    event - The motion event that describes the hover.
    
    Returns:
    True if the view group would like to intercept the hover event and prevent its children from receiving it.
  - dispatchGenericPointerEvent
```
protected boolean dispatchGenericPointerEvent(MotionEvent event)
```
    Dispatch a generic motion event to the view under the first pointer.
    Do not call this method directly. Call View.dispatchGenericMotionEvent(MotionEvent) instead.
    
    Overrides:
    
    dispatchGenericPointerEvent in class View
    
    Parameters:
    event - The motion event to be dispatched.
    
    Returns:
    True if the event was handled by the view, false otherwise.
  - dispatchGenericFocusedEvent
```
protected boolean dispatchGenericFocusedEvent(MotionEvent event)
```
    Dispatch a generic motion event to the currently focused view.
    Do not call this method directly. Call View.dispatchGenericMotionEvent(MotionEvent) instead.
    
    Overrides:
    
    dispatchGenericFocusedEvent in class View
    
    Parameters:
    event - The motion event to be dispatched.
    
    Returns:
    True if the event was handled by the view, false otherwise.
  - dispatchTouchEvent
```
public boolean dispatchTouchEvent(MotionEvent ev)
```
    Pass the touch screen motion event down to the target view, or this view if it is the target.
    
    Overrides:
    
    dispatchTouchEvent in class View
    
    Parameters:
    ev - The motion event to be dispatched.
    
    Returns:
    True if the event was handled by the view, false otherwise.
  - isTransformedTouchPointInView
```
protected boolean isTransformedTouchPointInView(float x,
                                    float y,
                                    View child,
                                    PointF outLocalPoint)
```
    Returns true if a child view contains the specified point when transformed into its coordinate space. Child must not be null.
  - setMotionEventSplittingEnabled
```
public void setMotionEventSplittingEnabled(boolean split)
```
    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 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.
    
    Parameters:
    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.
  - isMotionEventSplittingEnabled
```
public boolean isMotionEventSplittingEnabled()
```
    Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children.
    
    Returns:
    true if MotionEvents dispatched to this ViewGroup can be split to multiple children.
  - requestDisallowInterceptTouchEvent
```
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept)
```
    Called when a child does not want this parent and its ancestors to intercept touch events with onInterceptTouchEvent(MotionEvent).
    This parent should pass this call onto its parents. This parent must obey this request for the duration of the touch (that is, only clear the flag after this parent has received an up or a cancel.
    
    Specified by:
    
    requestDisallowInterceptTouchEvent in interface ViewParent
    
    Parameters:
    disallowIntercept - True if the child does not want the parent to intercept touch events.
  - onInterceptTouchEvent
```
public boolean onInterceptTouchEvent(MotionEvent ev)
```
    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 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 MotionEvent.ACTION_CANCEL, and all further events will be delivered to your onTouchEvent() method and no longer appear here.
    Parameters:
    ev - The motion event being dispatched down the hierarchy.
    
    Returns:
    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.
  - requestFocus
```
public boolean requestFocus(int direction,
                   Rect previouslyFocusedRect)
```
    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 (View.isFocusable() returns false), or if it is focusable and it is not focusable in touch mode (View.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 getDescendantFocusability() equal to FOCUS_BLOCK_DESCENDANTS. See also View.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 View has an internal View that it wishes to forward the request to. Looks for a view to give focus to respecting the setting specified by getDescendantFocusability(). Uses onRequestFocusInDescendants(int, android.graphics.Rect) to find focus within the children of this group when appropriate.
    
    Overrides:
    
    requestFocus in class View
    
    Parameters:
    direction - One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
    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.
    
    Returns:
    Whether this view or one of its descendants actually took focus.
    See Also:
    FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS, onRequestFocusInDescendants(int, android.graphics.Rect)
  - onRequestFocusInDescendants
```
protected boolean onRequestFocusInDescendants(int direction,
                                  Rect previouslyFocusedRect)
```
    Look for a descendant to call View.requestFocus() on. Called by requestFocus(int, android.graphics.Rect) when it wants to request focus within its children. Override this to customize how your ViewGroup requests focus within its children.
    
    Parameters:
    direction - One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
    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.
    
    Returns:
    Whether focus was taken.
  - dispatchStartTemporaryDetach
```
public void dispatchStartTemporaryDetach()
```
    Overrides:
    
    dispatchStartTemporaryDetach in class View
  - dispatchFinishTemporaryDetach
```
public void dispatchFinishTemporaryDetach()
```
    Overrides:
    
    dispatchFinishTemporaryDetach in class View
  - resetAccessibilityStateChanged
```
public void resetAccessibilityStateChanged()
```
    Description copied from class: View
    
    Reset the state indicating the this view has requested clients interested in its accessibility state to be notified.
    
    Overrides:
    
    resetAccessibilityStateChanged in class View
  - internalSetPadding
```
protected void internalSetPadding(int left,
                      int top,
                      int right,
                      int bottom)
```
    Overrides:
    
    internalSetPadding in class View
  - dispatchSaveInstanceState
```
protected void dispatchSaveInstanceState(SparseArray<Parcelable> container)
```
    Called by View.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.
    
    Overrides:
    
    dispatchSaveInstanceState in class View
    
    Parameters:
    container - The SparseArray in which to save the view's state.
    See Also:
    View.dispatchRestoreInstanceState(android.util.SparseArray), View.saveHierarchyState(android.util.SparseArray), View.onSaveInstanceState()
  - dispatchFreezeSelfOnly
```
protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container)
```
    Perform dispatching of a View.saveHierarchyState(android.util.SparseArray) freeze()} to only this view, not to its children. For use when overriding dispatchSaveInstanceState(android.util.SparseArray) dispatchFreeze()} to allow subclasses to freeze their own state but not the state of their children.
    
    Parameters:
    container - the container
  - dispatchRestoreInstanceState
```
protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container)
```
    Called by View.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.
    
    Overrides:
    
    dispatchRestoreInstanceState in class View
    
    Parameters:
    container - The SparseArray which holds previously saved state.
    See Also:
    View.dispatchSaveInstanceState(android.util.SparseArray), View.restoreHierarchyState(android.util.SparseArray), View.onRestoreInstanceState(android.os.Parcelable)
  - dispatchThawSelfOnly
```
protected void dispatchThawSelfOnly(SparseArray<Parcelable> container)
```
    Perform dispatching of a View.restoreHierarchyState(android.util.SparseArray) to only this view, not to its children. For use when overriding dispatchRestoreInstanceState(android.util.SparseArray) to allow subclasses to thaw their own state but not the state of their children.
    
    Parameters:
    container - the container
  - setChildrenDrawingCacheEnabled
```
protected void setChildrenDrawingCacheEnabled(boolean enabled)
```
    Enables or disables the drawing cache for each child of this view group.
    
    Parameters:
    enabled - true to enable the cache, false to dispose of it
  - onAnimationStart
```
protected void onAnimationStart()
```
    Description copied from class: View
    
    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();
    
    Overrides:
    
    onAnimationStart in class View
    
    See Also:
    View.setAnimation(android.view.animation.Animation), View.getAnimation()
  - onAnimationEnd
```
protected void onAnimationEnd()
```
    Description copied from class: View
    
    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();
    
    Overrides:
    
    onAnimationEnd in class View
    
    See Also:
    View.setAnimation(android.view.animation.Animation), View.getAnimation()
  - onDebugDrawMargins
```
protected void onDebugDrawMargins(Canvas canvas)
```
  - onDebugDraw
```
protected void onDebugDraw(Canvas canvas)
```
  - dispatchDraw
```
protected void dispatchDraw(Canvas canvas)
```
    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).
    
    Overrides:
    
    dispatchDraw in class View
    
    Parameters:
    canvas - the canvas on which to draw the view
  - getChildDrawingOrder
```
protected int getChildDrawingOrder(int childCount,
                       int i)
```
    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 setChildrenDrawingOrderEnabled(boolean).
    
    Parameters:
    i - The current iteration.
    
    Returns:
    The index of the child to draw this iteration.
    See Also:
    setChildrenDrawingOrderEnabled(boolean), isChildrenDrawingOrderEnabled()
  - dispatchGetDisplayList
```
protected void dispatchGetDisplayList()
```
    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.
    
    Overrides:
    
    dispatchGetDisplayList in class View
  - drawChild
```
protected boolean drawChild(Canvas canvas,
                View child,
                long drawingTime)
```
    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.
    
    Parameters:
    canvas - The canvas on which to draw the child
    child - Who to draw
    drawingTime - The time at which draw is occurring
    
    Returns:
    True if an invalidate() was issued
  - setClipChildren
```
public void setClipChildren(boolean clipChildren)
```
    By default, children are clipped to their bounds before drawing. This allows view groups to override this behavior for animations, etc.
    
    Parameters:
    clipChildren - true to clip children to their bounds, false otherwise
  - setClipToPadding
```
public void setClipToPadding(boolean clipToPadding)
```
    By default, children are clipped to the padding of the ViewGroup. This allows view groups to override this behavior
    
    Parameters:
    clipToPadding - true to clip children to the padding of the group, false otherwise
  - dispatchSetSelected
```
public void dispatchSetSelected(boolean selected)
```
    Dispatch setSelected to all of this View's children.
    
    Overrides:
    
    dispatchSetSelected in class View
    
    Parameters:
    selected - The new selected state
    See Also:
    View.setSelected(boolean)
  - dispatchSetActivated
```
public void dispatchSetActivated(boolean activated)
```
    Dispatch setActivated to all of this View's children.
    
    Overrides:
    
    dispatchSetActivated in class View
    
    Parameters:
    activated - The new activated state
    See Also:
    View.setActivated(boolean)
  - dispatchSetPressed
```
protected void dispatchSetPressed(boolean pressed)
```
    Description copied from class: View
    
    Dispatch setPressed to all of this View's children.
    
    Overrides:
    
    dispatchSetPressed in class View
    
    Parameters:
    pressed - The new pressed state
    See Also:
    View.setPressed(boolean)
  - setStaticTransformationsEnabled
```
protected void setStaticTransformationsEnabled(boolean enabled)
```
    When this property is set to true, this ViewGroup supports static transformations on children; this causes getChildStaticTransformation(View, android.view.animation.Transformation) to be invoked when a child is drawn. Any subclass overriding getChildStaticTransformation(View, android.view.animation.Transformation) should set this property to true.
    
    Parameters:
    enabled - True to enable static transformations on children, false otherwise.
    See Also:
    getChildStaticTransformation(View, android.view.animation.Transformation)
  - getChildStaticTransformation
```
protected boolean getChildStaticTransformation(View child,
                                   Transformation t)
```
    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. setStaticTransformationsEnabled(boolean) must be set to true for this method to be called.
    
    Parameters:
    child - The child view whose static transform is being requested
    t - The Transformation which will hold the result
    
    Returns:
    true if the transformation was set, false otherwise
    See Also:
    setStaticTransformationsEnabled(boolean)
  - findViewTraversal
```
protected View findViewTraversal(int id)
```
    Overrides:
    
    findViewTraversal in class View
    
    Parameters:
    id - the id of the view to be found
    
    Returns:
    the view of the specified id, null if cannot be found
  - findViewWithTagTraversal
```
protected View findViewWithTagTraversal(Object tag)
```
    Overrides:
    
    findViewWithTagTraversal in class View
    
    Parameters:
    tag - the tag of the view to be found
    
    Returns:
    the view of specified tag, null if cannot be found
  - findViewByPredicateTraversal
```
protected View findViewByPredicateTraversal(com.android.internal.util.Predicate<View> predicate,
                                View childToSkip)
```
    Overrides:
    
    findViewByPredicateTraversal in class View
    
    Parameters:
    predicate - The predicate to evaluate.
    childToSkip - If not null, ignores this child during the recursive traversal.
    
    Returns:
    The first view that matches the predicate or null.
  - addView
```
public void addView(View child)
```
    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 View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Parameters:
    child - the child view to add
    See Also:
    generateDefaultLayoutParams()
  - addView
```
public void addView(View child,
           int index)
```
    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 View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Parameters:
    child - the child view to add
    index - the position at which to add the child
    See Also:
    generateDefaultLayoutParams()
  - addView
```
public void addView(View child,
           int width,
           int height)
```
    Adds a child view with this ViewGroup's default layout parameters and the specified width and height.
    Note: do not invoke this method from View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Parameters:
    child - the child view to add
  - addView
```
public void addView(View child,
           ViewGroup.LayoutParams params)
```
    Adds a child view with the specified layout parameters.
    Note: do not invoke this method from View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Specified by:
    
    addView in interface ViewManager
    
    Parameters:
    child - the child view to add
    params - the layout parameters to set on the child
  - addView
```
public void addView(View child,
           int index,
           ViewGroup.LayoutParams params)
```
    Adds a child view with the specified layout parameters.
    Note: do not invoke this method from View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Parameters:
    child - the child view to add
    index - the position at which to add the child
    params - the layout parameters to set on the child
  - updateViewLayout
```
public void updateViewLayout(View view,
                    ViewGroup.LayoutParams params)
```
    Specified by:
    
    updateViewLayout in interface ViewManager
  - checkLayoutParams
```
protected boolean checkLayoutParams(ViewGroup.LayoutParams p)
```
  - setOnHierarchyChangeListener
```
public void setOnHierarchyChangeListener(ViewGroup.OnHierarchyChangeListener listener)
```
    Register a callback to be invoked when a child is added to or removed from this view.
    
    Parameters:
    listener - the callback to invoke on hierarchy change
  - onViewAdded
```
protected void onViewAdded(View child)
```
  - onViewRemoved
```
protected void onViewRemoved(View child)
```
  - addViewInLayout
```
protected boolean addViewInLayout(View child,
                      int index,
                      ViewGroup.LayoutParams params)
```
    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.
    
    Parameters:
    child - the view to add to the group
    index - the index at which the child must be added
    params - the layout parameters to associate with the child
    
    Returns:
    true if the child was added, false otherwise
  - addViewInLayout
```
protected boolean addViewInLayout(View child,
                      int index,
                      ViewGroup.LayoutParams params,
                      boolean preventRequestLayout)
```
    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.
    
    Parameters:
    child - the view to add to the group
    index - the index at which the child must be added
    params - the layout parameters to associate with the child
    preventRequestLayout - if true, calling this method will not trigger a layout request on child
    
    Returns:
    true if the child was added, false otherwise
  - cleanupLayoutState
```
protected void cleanupLayoutState(View child)
```
    Prevents the specified child to be laid out during the next layout pass.
    
    Parameters:
    child - the child on which to perform the cleanup
  - attachLayoutAnimationParameters
```
protected void attachLayoutAnimationParameters(View child,
                                   ViewGroup.LayoutParams params,
                                   int index,
                                   int count)
```
    Subclasses should override this method to set layout animation parameters on the supplied child.
    
    Parameters:
    child - the child to associate with animation parameters
    params - the child's layout parameters which hold the animation parameters
    index - the index of the child in the view group
    count - the number of children in the view group
  - removeView
```
public void removeView(View view)
```
    Note: do not invoke this method from View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Specified by:
    
    removeView in interface ViewManager
  - removeViewInLayout
```
public void removeViewInLayout(View view)
```
    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 View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Parameters:
    view - the view to remove from the group
  - removeViewsInLayout
```
public void removeViewsInLayout(int start,
                       int count)
```
    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 View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Parameters:
    start - the index of the first view to remove from the group
    count - the number of views to remove from the group
  - removeViewAt
```
public void removeViewAt(int index)
```
    Removes the view at the specified position in the group.
    Note: do not invoke this method from View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Parameters:
    index - the position in the group of the view to remove
  - removeViews
```
public void removeViews(int start,
               int count)
```
    Removes the specified range of views from the group.
    Note: do not invoke this method from View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
    
    Parameters:
    start - the first position in the group of the range of views to remove
    count - the number of views to remove
  - setLayoutTransition
```
public void setLayoutTransition(LayoutTransition transition)
```
    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).
    
    Parameters:
    transition - The LayoutTransition object that will animated changes in layout. A value of null means no transition will run on layout changes.
  - getLayoutTransition
```
public LayoutTransition getLayoutTransition()
```
    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).
    
    Returns:
    LayoutTranstion The LayoutTransition object that will animated changes in layout. A value of null means no transition will run on layout changes.
  - removeAllViews
```
public void removeAllViews()
```
    Call this method to remove all child views from the ViewGroup.
    Note: do not invoke this method from View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
  - removeAllViewsInLayout
```
public void removeAllViewsInLayout()
```
    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 View.draw(android.graphics.Canvas), View.onDraw(android.graphics.Canvas), dispatchDraw(android.graphics.Canvas) or any related method.
  - removeDetachedView
```
protected void removeDetachedView(View child,
                      boolean animate)
```
    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 View.requestLayout() or View.invalidate() calls. For example, callers can post a Runnable which performs a View.requestLayout() on the next frame, after all detach/remove calls are finished, causing layout to be run prior to redrawing the view hierarchy.
    
    Parameters:
    child - the child to be definitely removed from the view hierarchy
    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 Also:
    attachViewToParent(View, int, android.view.ViewGroup.LayoutParams), detachAllViewsFromParent(), detachViewFromParent(View), detachViewFromParent(int)
  - attachViewToParent
```
protected void attachViewToParent(View child,
                      int index,
                      ViewGroup.LayoutParams params)
```
    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 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 View.requestLayout() or View.invalidate() calls. For example, callers can post a Runnable which performs a View.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.
    
    Parameters:
    child - the child to attach
    index - the index at which the child should be attached
    params - the layout parameters of the child
    See Also:
    removeDetachedView(View, boolean), detachAllViewsFromParent(), detachViewFromParent(View), detachViewFromParent(int)
  - detachViewFromParent
```
protected void detachViewFromParent(View child)
```
    Detaches a view from its parent. Detaching a view should be followed either by a call to attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) or a call to 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 getChildAt(int).
    
    Parameters:
    child - the child to detach
    See Also:
    detachViewFromParent(int), detachViewsFromParent(int, int), detachAllViewsFromParent(), attachViewToParent(View, int, android.view.ViewGroup.LayoutParams), removeDetachedView(View, boolean)
  - detachViewFromParent
```
protected void detachViewFromParent(int index)
```
    Detaches a view from its parent. Detaching a view should be followed either by a call to attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) or a call to 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 getChildAt(int).
    
    Parameters:
    index - the index of the child to detach
    See Also:
    detachViewFromParent(View), detachAllViewsFromParent(), detachViewsFromParent(int, int), attachViewToParent(View, int, android.view.ViewGroup.LayoutParams), removeDetachedView(View, boolean)
  - detachViewsFromParent
```
protected void detachViewsFromParent(int start,
                         int count)
```
    Detaches a range of views from their parents. Detaching a view should be followed either by a call to attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) or a call to 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 getChildAt(int).
    
    Parameters:
    start - the first index of the childrend range to detach
    count - the number of children to detach
    See Also:
    detachViewFromParent(View), detachViewFromParent(int), detachAllViewsFromParent(), attachViewToParent(View, int, android.view.ViewGroup.LayoutParams), removeDetachedView(View, boolean)
  - detachAllViewsFromParent
```
protected void detachAllViewsFromParent()
```
    Detaches all views from the parent. Detaching a view should be followed either by a call to attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) or a call to 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 getChildAt(int).
    
    See Also:
    detachViewFromParent(View), detachViewFromParent(int), detachViewsFromParent(int, int), attachViewToParent(View, int, android.view.ViewGroup.LayoutParams), removeDetachedView(View, boolean)
  - invalidateChild
```
public final void invalidateChild(View child,
                   Rect dirty)
```
    Don't call or override this method. It is used for the implementation of the view hierarchy.
    
    Specified by:
    
    invalidateChild in interface ViewParent
    
    Parameters:
    child - The child which is dirty
    dirty - The area within the child that is invalid
  - invalidateChildInParent
```
public ViewParent invalidateChildInParent(int[] location,
                                 Rect dirty)
```
    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.
    
    Specified by:
    
    invalidateChildInParent in interface ViewParent
    
    Parameters:
    location - An array of 2 ints containing the left and top coordinates of the child to invalidate
    dirty - The area within the child that is invalid
    
    Returns:
    the parent of this ViewParent or null
  - invalidateChildFast
```
public void invalidateChildFast(View child,
                       Rect dirty)
```
    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.
  - offsetDescendantRectToMyCoords
```
public final void offsetDescendantRectToMyCoords(View descendant,
                                  Rect rect)
```
    Offset a rectangle that is in a descendant's coordinate space into our coordinate space.
    
    Parameters:
    descendant - A descendant of this view
    rect - A rectangle defined in descendant's coordinate space.
  - offsetRectIntoDescendantCoords
```
public final void offsetRectIntoDescendantCoords(View descendant,
                                  Rect rect)
```
    Offset a rectangle that is in our coordinate space into an ancestor's coordinate space.
    
    Parameters:
    descendant - A descendant of this view
    rect - A rectangle defined in descendant's coordinate space.
  - offsetChildrenTopAndBottom
```
public void offsetChildrenTopAndBottom(int offset)
```
    Offset the vertical location of all children of this view by the specified number of pixels.
    
    Parameters:
    offset - the number of pixels to offset
  - getChildVisibleRect
```
public boolean getChildVisibleRect(View child,
                          Rect r,
                          Point offset)
```
    Compute the visible part of a rectangular region defined in terms of a child view's coordinates.
    Returns the clipped visible part of the rectangle r, defined in the child's local coordinate system. r is modified by this method to contain the result, expressed in the global (root) coordinate system.
    
    The resulting rectangle is always axis aligned. If a rotation is applied to a node in the View hierarchy, the result is the axis-aligned bounding box of the visible rectangle.
    
    Specified by:
    
    getChildVisibleRect in interface ViewParent
    
    Parameters:
    child - A child View, whose rectangular visible region we want to compute
    r - The input rectangle, defined in the child coordinate system. Will be overwritten to contain the resulting visible rectangle, expressed in global (root) coordinates
    offset - The input coordinates of a point, defined in the child coordinate system. As with the r parameter, this will be overwritten to contain the global (root) coordinates of that point. A null value is valid (in case you are not interested in this result)
    
    Returns:
    true if the resulting rectangle is not empty, false otherwise
  - layout
```
public final void layout(int l,
          int t,
          int r,
          int b)
```
    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.
    
    Overrides:
    
    layout in class View
    
    Parameters:
    l - Left position, relative to parent
    t - Top position, relative to parent
    r - Right position, relative to parent
    b - Bottom position, relative to parent
  - onLayout
```
protected abstract void onLayout(boolean changed,
            int l,
            int t,
            int r,
            int b)
```
    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.
    
    Overrides:
    
    onLayout in class View
    
    Parameters:
    changed - This is a new size or position for this view
    l - Left position, relative to parent
    t - Top position, relative to parent
    r - Right position, relative to parent
    b - Bottom position, relative to parent
  - canAnimate
```
protected boolean canAnimate()
```
    Indicates whether the view group has the ability to animate its children after the first layout.
    
    Returns:
    true if the children can be animated, false otherwise
  - startLayoutAnimation
```
public void startLayoutAnimation()
```
    Runs the layout animation. Calling this method triggers a relayout of this view group.
  - scheduleLayoutAnimation
```
public void scheduleLayoutAnimation()
```
    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.
  - setLayoutAnimation
```
public void setLayoutAnimation(LayoutAnimationController controller)
```
    Sets the layout animation controller used to animate the group's children after the first layout.
    
    Parameters:
    controller - the animation controller
  - getLayoutAnimation
```
public LayoutAnimationController getLayoutAnimation()
```
    Returns the layout animation controller used to animate the group's children.
    
    Returns:
    the current animation controller
  - isAnimationCacheEnabled
```
public boolean isAnimationCacheEnabled()
```
    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.
    
    Returns:
    true if the animation cache is enabled, false otherwise
    See Also:
    setAnimationCacheEnabled(boolean), View.setDrawingCacheEnabled(boolean)
  - setAnimationCacheEnabled
```
public void setAnimationCacheEnabled(boolean enabled)
```
    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.
    
    Parameters:
    enabled - true to enable the animation cache, false otherwise
    See Also:
    isAnimationCacheEnabled(), View.setDrawingCacheEnabled(boolean)
  - isAlwaysDrawnWithCacheEnabled
```
public boolean isAlwaysDrawnWithCacheEnabled()
```
    Indicates whether this ViewGroup will always try to draw its children using their drawing cache. By default this property is enabled.
    
    Returns:
    true if the animation cache is enabled, false otherwise
    See Also:
    setAlwaysDrawnWithCacheEnabled(boolean), setChildrenDrawnWithCacheEnabled(boolean), View.setDrawingCacheEnabled(boolean)
  - setAlwaysDrawnWithCacheEnabled
```
public void setAlwaysDrawnWithCacheEnabled(boolean always)
```
    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.
    
    Parameters:
    always - true to always draw with the drawing cache, false otherwise
    See Also:
    isAlwaysDrawnWithCacheEnabled(), setChildrenDrawnWithCacheEnabled(boolean), View.setDrawingCacheEnabled(boolean), View.setDrawingCacheQuality(int)
  - isChildrenDrawnWithCacheEnabled
```
protected boolean isChildrenDrawnWithCacheEnabled()
```
    Indicates whether the ViewGroup is currently drawing its children using their drawing cache.
    
    Returns:
    true if children should be drawn with their cache, false otherwise
    See Also:
    setAlwaysDrawnWithCacheEnabled(boolean), setChildrenDrawnWithCacheEnabled(boolean)
  - setChildrenDrawnWithCacheEnabled
```
protected void setChildrenDrawnWithCacheEnabled(boolean enabled)
```
    Tells the ViewGroup to draw its children using their drawing cache. This property is ignored when 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.
    
    Parameters:
    enabled - true if children should be drawn with their cache, false otherwise
    See Also:
    setAlwaysDrawnWithCacheEnabled(boolean), isChildrenDrawnWithCacheEnabled()
  - isChildrenDrawingOrderEnabled
```
protected boolean isChildrenDrawingOrderEnabled()
```
    Indicates whether the ViewGroup is drawing its children in the order defined by getChildDrawingOrder(int, int).
    
    Returns:
    true if children drawing order is defined by getChildDrawingOrder(int, int), false otherwise
    See Also:
    setChildrenDrawingOrderEnabled(boolean), getChildDrawingOrder(int, int)
  - setChildrenDrawingOrderEnabled
```
protected void setChildrenDrawingOrderEnabled(boolean enabled)
```
    Tells the ViewGroup whether to draw its children in the order defined by the method getChildDrawingOrder(int, int).
    
    Parameters:
    enabled - true if the order of the children when drawing is determined by getChildDrawingOrder(int, int), false otherwise
    See Also:
    isChildrenDrawingOrderEnabled(), getChildDrawingOrder(int, int)
  - getPersistentDrawingCache
```
public int getPersistentDrawingCache()
```
    Returns an integer indicating what types of drawing caches are kept in memory.
    
    Returns:
    one or a combination of PERSISTENT_NO_CACHE, PERSISTENT_ANIMATION_CACHE, PERSISTENT_SCROLLING_CACHE and PERSISTENT_ALL_CACHES
    See Also:
    setPersistentDrawingCache(int), setAnimationCacheEnabled(boolean)
  - setPersistentDrawingCache
```
public void setPersistentDrawingCache(int drawingCacheToKeep)
```
    Indicates what types of drawing caches should be kept in memory after they have been created.
    
    Parameters:
    drawingCacheToKeep - one or a combination of PERSISTENT_NO_CACHE, PERSISTENT_ANIMATION_CACHE, PERSISTENT_SCROLLING_CACHE and PERSISTENT_ALL_CACHES
    See Also:
    getPersistentDrawingCache(), setAnimationCacheEnabled(boolean)
  - getLayoutMode
```
public int getLayoutMode()
```
    Returns the basis of alignment during layout operations on this view group: either CLIP_BOUNDS or OPTICAL_BOUNDS.
    
    Returns:
    the layout mode to use during layout operations
    See Also:
    setLayoutMode(int)
  - setLayoutMode
```
public void setLayoutMode(int layoutMode)
```
    Sets the basis of alignment during the layout of this view group. Valid values are either CLIP_BOUNDS or OPTICAL_BOUNDS.
    The default is CLIP_BOUNDS.
    
    Parameters:
    layoutMode - the layout mode to use during layout operations
    See Also:
    getLayoutMode()
  - generateLayoutParams
```
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs)
```
    Returns a new set of layout parameters based on the supplied attributes set.
    
    Parameters:
    attrs - the attributes to build the layout parameters from
    
    Returns:
    an instance of ViewGroup.LayoutParams or one of its descendants
  - generateLayoutParams
```
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p)
```
    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 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.
    
    Parameters:
    p - The layout parameters to convert into a suitable set of layout parameters for this ViewGroup.
    
    Returns:
    an instance of ViewGroup.LayoutParams or one of its descendants
  - generateDefaultLayoutParams
```
protected ViewGroup.LayoutParams generateDefaultLayoutParams()
```
    Returns a set of default layout parameters. These parameters are requested when the View passed to addView(View) has no layout parameters already set. If null is returned, an exception is thrown from addView.
    
    Returns:
    a set of default layout parameters or null
  - debug
```
protected void debug(int depth)
```
    Prints information about this view in the log output, with the tag View.VIEW_LOG_TAG. Each line in the output is preceded with an indentation defined by the depth.
    
    Overrides:
    
    debug in class View
    
    Parameters:
    depth - the indentation level
  - indexOfChild
```
public int indexOfChild(View child)
```
    Returns the position in the group of the specified child view.
    
    Parameters:
    child - the view for which to get the position
    
    Returns:
    a positive integer representing the position of the view in the group, or -1 if the view does not exist in the group
  - getChildCount
```
public int getChildCount()
```
    Returns the number of children in the group.
    
    Returns:
    a positive integer representing the number of children in the group
  - getChildAt
```
public View getChildAt(int index)
```
    Returns the view at the specified position in the group.
    
    Parameters:
    index - the position at which to get the view from
    
    Returns:
    the view at the specified position or null if the position does not exist within the group
  - measureChildren
```
protected void measureChildren(int widthMeasureSpec,
                   int heightMeasureSpec)
```
    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.
    
    Parameters:
    widthMeasureSpec - The width requirements for this view
    heightMeasureSpec - The height requirements for this view
  - measureChild
```
protected void measureChild(View child,
                int parentWidthMeasureSpec,
                int parentHeightMeasureSpec)
```
    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.
    
    Parameters:
    child - The child to measure
    parentWidthMeasureSpec - The width requirements for this view
    parentHeightMeasureSpec - The height requirements for this view
  - measureChildWithMargins
```
protected void measureChildWithMargins(View child,
                           int parentWidthMeasureSpec,
                           int widthUsed,
                           int parentHeightMeasureSpec,
                           int heightUsed)
```
    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.
    
    Parameters:
    child - The child to measure
    parentWidthMeasureSpec - The width requirements for this view
    widthUsed - Extra space that has been used up by the parent horizontally (possibly by other children of the parent)
    parentHeightMeasureSpec - The height requirements for this view
    heightUsed - Extra space that has been used up by the parent vertically (possibly by other children of the parent)
  - getChildMeasureSpec
```
public static int getChildMeasureSpec(int spec,
                      int padding,
                      int childDimension)
```
    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.
    
    Parameters:
    spec - The requirements for this view
    padding - The padding of this view for the current dimension and margins, if applicable
    childDimension - How big the child wants to be in the current dimension
    
    Returns:
    a MeasureSpec integer for the child
  - clearDisappearingChildren
```
public void clearDisappearingChildren()
```
    Removes any pending animations for views that have been removed. Call this if you don't want animations for exiting views to stack up.
  - startViewTransition
```
public void startViewTransition(View 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 Fragment and LayoutTransition to animate the removal of views. A call to this method should always be accompanied by a later call to endViewTransition(View), such as after an animation on the View has finished, so that the View finally gets removed.
    
    Parameters:
    view - The View object to be kept visible even if it gets removed from its parent.
  - endViewTransition
```
public void endViewTransition(View view)
```
    This method should always be called following an earlier call to 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.
  - gatherTransparentRegion
```
public boolean gatherTransparentRegion(Region region)
```
    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).
    
    Overrides:
    
    gatherTransparentRegion in class View
    
    Parameters:
    region - The transparent region for this ViewAncestor (window).
    
    Returns:
    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.
  - requestTransparentRegion
```
public void requestTransparentRegion(View child)
```
    Called when a child wants the view hierarchy to gather and report transparent regions to the window compositor. Views that "punch" holes in the view hierarchy, such as SurfaceView can use this API to improve performance of the system. When no such a view is present in the hierarchy, this optimization in unnecessary and might slightly reduce the view hierarchy performance.
    
    Specified by:
    
    requestTransparentRegion in interface ViewParent
    
    Parameters:
    child - the view requesting the transparent region computation
  - fitSystemWindows
```
protected boolean fitSystemWindows(Rect insets)
```
    Description copied from class: View
    
    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 View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.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 inset's 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 View.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 View.setSystemUiVisibility(int).
    
    Overrides:
    
    fitSystemWindows in class View
    
    Parameters:
    insets - Current content insets of the window. Prior to Build.VERSION_CODES.JELLY_BEAN you must not modify the insets or else you and Android will be unhappy.
    
    Returns:
    Return true if this view applied the insets and it should not continue propagating further down the hierarchy, false otherwise.
    See Also:
    View.getFitsSystemWindows(), View.setFitsSystemWindows(boolean), View.setSystemUiVisibility(int)
  - getLayoutAnimationListener
```
public Animation.AnimationListener getLayoutAnimationListener()
```
    Returns the animation listener to which layout animation events are sent.
    
    Returns:
    an Animation.AnimationListener
  - drawableStateChanged
```
protected void drawableStateChanged()
```
    Description copied from class: View
    
    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.
    
    Overrides:
    
    drawableStateChanged in class View
    
    See Also:
    Drawable.setState(int[])
  - jumpDrawablesToCurrentState
```
public void jumpDrawablesToCurrentState()
```
    Description copied from class: View
    
    Call Drawable.jumpToCurrentState() on all Drawable objects associated with this view.
    
    Overrides:
    
    jumpDrawablesToCurrentState in class View
  - onCreateDrawableState
```
protected int[] onCreateDrawableState(int extraSpace)
```
    Description copied from class: View
    
    Generate the new 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 View.getDrawableState().
    
    Overrides:
    
    onCreateDrawableState in class View
    
    Parameters:
    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.
    
    Returns:
    Returns an array holding the current Drawable state of the view.
    See Also:
    View.mergeDrawableStates(int[], int[])
  - setAddStatesFromChildren
```
public void setAddStatesFromChildren(boolean addsStates)
```
    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.
  - addStatesFromChildren
```
public boolean addStatesFromChildren()
```
    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.
  - childDrawableStateChanged
```
public void childDrawableStateChanged(View child)
```
    If addStatesFromChildren() is true, refreshes this group's drawable state (to include the states from its children).
    
    Specified by:
    
    childDrawableStateChanged in interface ViewParent
    
    Parameters:
    child - The child whose drawable state has changed.
  - setLayoutAnimationListener
```
public void setLayoutAnimationListener(Animation.AnimationListener animationListener)
```
    Specifies the animation listener to which layout animation events must be sent. Only Animation.AnimationListener.onAnimationStart(Animation) and Animation.AnimationListener.onAnimationEnd(Animation) are invoked.
    
    Parameters:
    animationListener - the layout animation listener
  - requestTransitionStart
```
public void requestTransitionStart(LayoutTransition transition)
```
    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.
    
    Parameters:
    transition - The LayoutTransition to be started on the next traversal.
  - resolveRtlPropertiesIfNeeded
```
public void resolveRtlPropertiesIfNeeded()
```
    Description copied from class: View
    
    Resolve all RTL related properties.
    
    Overrides:
    
    resolveRtlPropertiesIfNeeded in class View
  - resolveLayoutDirection
```
public boolean resolveLayoutDirection()
```
    Description copied from class: View
    
    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.
    
    Overrides:
    
    resolveLayoutDirection in class View
    
    Returns:
    true if resolution has been done, false otherwise.
  - resolveTextDirection
```
public boolean resolveTextDirection()
```
    Description copied from class: View
    
    Resolve the text direction.
    
    Overrides:
    
    resolveTextDirection in class View
    
    Returns:
    true if resolution has been done, false otherwise.
  - resolveTextAlignment
```
public boolean resolveTextAlignment()
```
    Description copied from class: View
    
    Resolve the text alignment.
    
    Overrides:
    
    resolveTextAlignment in class View
    
    Returns:
    true if resolution has been done, false otherwise.
  - resolvePadding
```
public void resolvePadding()
```
    Description copied from class: View
    
    Resolve padding depending on layout direction.
    
    Overrides:
    
    resolvePadding in class View
  - resolveDrawables
```
protected void resolveDrawables()
```
    Description copied from class: View
    
    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 View.onResolveDrawables(int) when resolution is done.
    
    Overrides:
    
    resolveDrawables in class View
  - resolveLayoutParams
```
public void resolveLayoutParams()
```
    Description copied from class: View
    
    Resolve the layout parameters depending on the resolved layout direction
    
    Overrides:
    
    resolveLayoutParams in class View
  - resetRtlProperties
```
public void resetRtlProperties()
```
    Description copied from class: View
    
    Reset resolution of all RTL related properties.
    
    Overrides:
    
    resetRtlProperties in class View
  - resetResolvedLayoutDirection
```
public void resetResolvedLayoutDirection()
```
    Description copied from class: View
    
    Reset the resolved layout direction. Layout direction will be resolved during a call to View.onMeasure(int, int).
    
    Overrides:
    
    resetResolvedLayoutDirection in class View
  - resetResolvedTextDirection
```
public void resetResolvedTextDirection()
```
    Description copied from class: View
    
    Reset resolved text direction. Text direction will be resolved during a call to View.onMeasure(int, int).
    
    Overrides:
    
    resetResolvedTextDirection in class View
  - resetResolvedTextAlignment
```
public void resetResolvedTextAlignment()
```
    Description copied from class: View
    
    Reset resolved text alignment. Text alignment will be resolved during a call to View.onMeasure(int, int).
    
    Overrides:
    
    resetResolvedTextAlignment in class View
  - resetResolvedPadding
```
public void resetResolvedPadding()
```
    Description copied from class: View
    
    Reset the resolved layout direction.
    
    Overrides:
    
    resetResolvedPadding in class View
  - resetResolvedDrawables
```
protected void resetResolvedDrawables()
```
    Overrides:
    
    resetResolvedDrawables in class View
  - shouldDelayChildPressedState
```
public boolean shouldDelayChildPressedState()
```
    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.
  - onSetLayoutParams
```
protected void onSetLayoutParams(View child,
                     ViewGroup.LayoutParams layoutParams)
```

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Android Reference

ViewGroup

Class ViewGroup

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Nested Class Summary

Nested classes/interfaces inherited from class android.view.View

Field Summary

Fields inherited from class android.view.View

Constructor Summary

Method Summary

Methods inherited from class android.view.View

Methods inherited from class java.lang.Object

Methods inherited from interface android.view.ViewParent

Field Detail

mDisappearingChildren

mOnHierarchyChangeListener

mGroupFlags

FLAG_USE_CHILD_DRAWING_ORDER

FLAG_SUPPORT_STATIC_TRANSFORMATIONS

FOCUS_BEFORE_DESCENDANTS

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Constructor Detail

ViewGroup

ViewGroup

ViewGroup

Method Detail

getDescendantFocusability

setDescendantFocusability

requestChildFocus

focusableViewAvailable

showContextMenuForChild

startActionModeForChild

focusSearch

requestChildRectangleOnScreen

requestSendAccessibilityEvent

onRequestSendAccessibilityEvent

childHasTransientStateChanged

hasTransientState

dispatchUnhandledMove

clearChildFocus

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getFocusedChild

hasFocus

findFocus

hasFocusable

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makeOptionalFitsSystemWindows

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onChildVisibilityChanged

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dispatchWindowVisibilityChanged

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dispatchWindowSystemUiVisiblityChanged

dispatchSystemUiVisibilityChanged

dispatchKeyEventPreIme

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dispatchHoverEvent

hasHoveredChild

addChildrenForAccessibility

childAccessibilityStateChanged

onInterceptHoverEvent