fullscreen Use Tree Navigation

Added in API level 1

public class

LinearLayout

extends ViewGroup

java.lang.Object
↳	android.view.View
	↳	android.view.ViewGroup
		↳	android.widget.LinearLayout

Known Direct Subclasses

ActionMenuView, ListRowHoverCardView, ListRowView, NumberPicker, RadioGroup, SearchView, TabWidget, TableLayout, TableRow, ZoomControls

Class Overview

A Layout that arranges its children in a single column or a single row. The direction of the row can be set by calling setOrientation(). You can also specify gravity, which specifies the alignment of all the child elements by calling setGravity() or specify that specific children grow to fill up any remaining space in the layout by setting the weight member of LinearLayout.LayoutParams. The default orientation is horizontal.

See the Linear Layout guide.

Also see android.widget.LinearLayout.LayoutParams for layout attributes

Summary

Nested Classes
class	LinearLayout.LayoutParams	Per-child layout information associated with ViewLinearLayout.

XML Attributes
Attribute Name	Related Method	Description
android:baselineAligned	setBaselineAligned(boolean)	When set to false, prevents the layout from aligning its children's baselines.
android:baselineAlignedChildIndex	setBaselineAlignedChildIndex(int)	When a linear layout is part of another layout that is baseline aligned, it can specify which of its children to baseline align to (that is, which child TextView).
android:divider	setDividerDrawable(Drawable)	Drawable to use as a vertical divider between buttons.
android:gravity	setGravity(int)	Specifies how an object should position its content, on both the X and Y axes, within its own bounds.
android:measureWithLargestChild	setMeasureWithLargestChildEnabled(boolean)	When set to true, all children with a weight will be considered having the minimum size of the largest child.
android:orientation	setOrientation(int)	Should the layout be a column or a row? Use "horizontal" for a row, "vertical" for a column.
android:weightSum		Defines the maximum weight sum.

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Inherited XML Attributes

From class android.view.ViewGroup

From class android.view.View

Constants
int	HORIZONTAL
int	SHOW_DIVIDER_BEGINNING	Show a divider at the beginning of the group.
int	SHOW_DIVIDER_END	Show a divider at the end of the group.
int	SHOW_DIVIDER_MIDDLE	Show dividers between each item in the group.
int	SHOW_DIVIDER_NONE	Don't show any dividers.
int	VERTICAL

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Inherited Constants

From class android.view.ViewGroup

From class android.view.View

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Inherited Fields

From class android.view.View

Public Constructors
	LinearLayout(Context context)
	LinearLayout(Context context, AttributeSet attrs)
	LinearLayout(Context context, AttributeSet attrs, int defStyleAttr)
	LinearLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)

Public Methods
LinearLayout.LayoutParams	generateLayoutParams(AttributeSet attrs) Returns a new set of layout parameters based on the supplied attributes set.
int	getBaseline() Return the offset of the widget's text baseline from the widget's top boundary.
int	getBaselineAlignedChildIndex()
Drawable	getDividerDrawable()
int	getDividerPadding() Get the padding size used to inset dividers in pixels
int	getOrientation() Returns the current orientation.
int	getShowDividers()
float	getWeightSum() Returns the desired weights sum.
boolean	isBaselineAligned() Indicates whether widgets contained within this layout are aligned on their baseline or not.
boolean	isMeasureWithLargestChildEnabled() When true, all children with a weight will be considered having the minimum size of the largest child.
void	onInitializeAccessibilityEvent(AccessibilityEvent event) Initializes an `AccessibilityEvent` with information about this View which is the event source.
void	onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) Initializes an `AccessibilityNodeInfo` with information about this view.
void	setBaselineAligned(boolean baselineAligned) Defines whether widgets contained in this layout are baseline-aligned or not.
void	setBaselineAlignedChildIndex(int i)
void	setDividerDrawable(Drawable divider) Set a drawable to be used as a divider between items.
void	setDividerPadding(int padding) Set padding displayed on both ends of dividers.
void	setGravity(int gravity) Describes how the child views are positioned.
void	setHorizontalGravity(int horizontalGravity)
void	setMeasureWithLargestChildEnabled(boolean enabled) When set to true, all children with a weight will be considered having the minimum size of the largest child.
void	setOrientation(int orientation) Should the layout be a column or a row.
void	setShowDividers(int showDividers) Set how dividers should be shown between items in this layout
void	setVerticalGravity(int verticalGravity)
void	setWeightSum(float weightSum) Defines the desired weights sum.
boolean	shouldDelayChildPressedState() Return true if the pressed state should be delayed for children or descendants of this ViewGroup.

Protected Methods
boolean	checkLayoutParams(ViewGroup.LayoutParams p)
LinearLayout.LayoutParams	generateDefaultLayoutParams() Returns a set of layout parameters with a width of `MATCH_PARENT` and a height of `WRAP_CONTENT` when the layout's orientation is `VERTICAL`.
LinearLayout.LayoutParams	generateLayoutParams(ViewGroup.LayoutParams p) Returns a safe set of layout parameters based on the supplied layout params.
void	onDraw(Canvas canvas) Implement this to do your drawing.
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.
void	onMeasure(int widthMeasureSpec, int heightMeasureSpec) Measure the view and its content to determine the measured width and the measured height.

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Inherited Methods

From class android.view.ViewGroup

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, 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.
void	addView(View child, int index) Adds a child view.
void	addView(View child) 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.
boolean	addViewInLayout(View child, int index, ViewGroup.LayoutParams params, boolean preventRequestLayout) Adds a view during layout.
boolean	addViewInLayout(View child, int index, ViewGroup.LayoutParams params) Adds a view during layout.
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.
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.
boolean	canAnimate() Indicates whether the view group has the ability to animate its children after the first layout.
boolean	checkLayoutParams(ViewGroup.LayoutParams p)
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.
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.
void	debug(int depth) Prints information about this view in the log output, with the tag `VIEW_LOG_TAG`.
void	detachAllViewsFromParent() Detaches all views from the parent.
void	detachViewFromParent(View child) Detaches a view from its parent.
void	detachViewFromParent(int index) Detaches a view from its parent.
void	detachViewsFromParent(int start, int count) Detaches a range of views from their parents.
WindowInsets	dispatchApplyWindowInsets(WindowInsets insets) Request to apply the given window insets to this view or another view in its subtree.
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.
void	dispatchDraw(Canvas canvas) Called by draw to draw the child views.
void	dispatchFreezeSelfOnly(SparseArray<Parcelable> container) Perform dispatching of a `saveHierarchyState(android.util.SparseArray)` freeze()} to only this view, not to its children.
boolean	dispatchGenericFocusedEvent(MotionEvent event) Dispatch a generic motion event to the currently focused view.
boolean	dispatchGenericPointerEvent(MotionEvent event) Dispatch a generic motion event to the view under the first pointer.
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.
void	dispatchRestoreInstanceState(SparseArray<Parcelable> container) Called by `restoreHierarchyState(android.util.SparseArray)` to retrieve the state for this view and its children.
void	dispatchSaveInstanceState(SparseArray<Parcelable> container) Called by `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.
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	dispatchSystemUiVisibilityChanged(int visible) Dispatch callbacks to `setOnSystemUiVisibilityChangeListener(View.OnSystemUiVisibilityChangeListener)` down the view hierarchy.
void	dispatchThawSelfOnly(SparseArray<Parcelable> container) Perform dispatching of a `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.
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 `onWindowSystemUiVisibilityChanged(int)` down the view hierarchy.
void	dispatchWindowVisibilityChanged(int visibility) Dispatch a window visibility change down the view hierarchy.
boolean	drawChild(Canvas canvas, View child, long drawingTime) Draw one child of this View Group.
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.
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.
void	findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) Finds the Views that contain given text.
View	focusSearch(View focused, int direction) Find the nearest view in the specified direction that wants to take focus.
void	focusableViewAvailable(View v) Tells the parent that a new focusable view has become available.
boolean	gatherTransparentRegion(Region region) This is used by the RootView to perform an optimization when the view hierarchy contains one or several SurfaceView.
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.
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.
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.
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.
boolean	getClipChildren() Returns whether this group's children are clipped to their bounds before drawing.
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 ViewGroup: either `LAYOUT_MODE_CLIP_BOUNDS` or `LAYOUT_MODE_OPTICAL_BOUNDS`.
LayoutTransition	getLayoutTransition() Gets the LayoutTransition object for this ViewGroup.
int	getNestedScrollAxes() Return the current axes of nested scrolling for this ViewGroup.
ViewGroupOverlay	getOverlay() Returns the ViewGroupOverlay for this view group, creating it if it does not yet exist.
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 `hasFocusable()` returns true.
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.
final void	invalidateChild(View child, Rect dirty) Don't call or override this method.
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.
boolean	isChildrenDrawingOrderEnabled() Indicates whether the ViewGroup is drawing its children in the order defined by `getChildDrawingOrder(int, int)`.
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.
boolean	isTransitionGroup() Returns true if this ViewGroup should be considered as a single entity for removal when executing an Activity transition.
void	jumpDrawablesToCurrentState() Call `Drawable.jumpToCurrentState()` on all Drawable objects associated with this view.
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.
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.
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	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.
void	notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) Notifies a view parent that the accessibility state of one of its descendants has changed and that the structure of the subtree is different.
final void	offsetDescendantRectToMyCoords(View descendant, Rect rect) Offset a rectangle that is in a descendant's coordinate space into our coordinate space.
final void	offsetRectIntoDescendantCoords(View descendant, Rect rect) Offset a rectangle that is in our coordinate space into an ancestor's coordinate space.
void	onAnimationEnd() Invoked by a parent ViewGroup to notify the end of the animation currently associated with this view.
void	onAnimationStart() Invoked by a parent ViewGroup to notify the start of the animation currently associated with this view.
void	onAttachedToWindow() This is called when the view is attached to a window.
int[]	onCreateDrawableState(int extraSpace) Generate the new `Drawable` state for this view.
void	onDetachedFromWindow() This is called when the view is detached from a window.
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.
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.
boolean	onNestedFling(View target, float velocityX, float velocityY, boolean consumed) Request a fling from a nested scroll.
void	onNestedPreScroll(View target, int dx, int dy, int[] consumed) React to a nested scroll in progress before the target view consumes a portion of the scroll.
void	onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) React to a nested scroll in progress.
void	onNestedScrollAccepted(View child, View target, int axes) React to the successful claiming of a nested scroll operation.
boolean	onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) Look for a descendant to call `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.
boolean	onStartNestedScroll(View child, View target, int nestedScrollAxes) React to a descendant view initiating a nestable scroll operation, claiming the nested scroll operation if appropriate.
void	onStopNestedScroll(View child) React to a nested scroll operation ending.
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.
void	removeDetachedView(View child, boolean animate) Finishes the removal of a detached view.
void	removeView(View view) Note: do not invoke this method from `draw(android.graphics.Canvas)`, `onDraw(android.graphics.Canvas)`, `dispatchDraw(android.graphics.Canvas)` or any related method.
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. Looks for a view to give focus to respecting the setting specified by `getDescendantFocusability()`.
boolean	requestSendAccessibilityEvent(View child, AccessibilityEvent event) Called by a child to request from its parent to send an `AccessibilityEvent`.
void	requestTransparentRegion(View child) Called when a child wants the view hierarchy to gather and report transparent regions to the window compositor.
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.
void	setChildrenDrawingCacheEnabled(boolean enabled) Enables or disables the drawing cache for each child of this view group.
void	setChildrenDrawingOrderEnabled(boolean enabled) Tells the ViewGroup whether to draw its children in the order defined by the method `getChildDrawingOrder(int, int)`.
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 ViewGroup.
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.
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.
void	setTransitionGroup(boolean isTransitionGroup) Changes whether or not this ViewGroup should be treated as a single entity during Activity Transitions.
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)

From class android.view.View

void	addChildrenForAccessibility(ArrayList<View> children) 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.
void	addFocusables(ArrayList<View> views, int direction) Add any focusable views that are descendants of this view (possibly including this view if it is focusable itself) to views.
void	addOnAttachStateChangeListener(View.OnAttachStateChangeListener listener) Add a listener for attach state changes.
void	addOnLayoutChangeListener(View.OnLayoutChangeListener listener) Add a listener that will be called when the bounds of the view change due to layout processing.
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.
ViewPropertyAnimator	animate() This method returns a ViewPropertyAnimator object, which can be used to animate specific properties on this View.
void	announceForAccessibility(CharSequence text) Convenience method for sending a `TYPE_ANNOUNCEMENT` `AccessibilityEvent` to make an announcement which is related to some sort of a context change for which none of the events representing UI transitions is a good fit.
boolean	awakenScrollBars(int startDelay) Trigger the scrollbars to draw.
boolean	awakenScrollBars(int startDelay, boolean invalidate) Trigger the scrollbars to draw.
boolean	awakenScrollBars() Trigger the scrollbars to draw.
void	bringToFront() Change the view's z order in the tree, so it's on top of other sibling views.
void	buildDrawingCache() Calling this method is equivalent to calling `buildDrawingCache(false)`.
void	buildDrawingCache(boolean autoScale) Forces the drawing cache to be built if the drawing cache is invalid.
void	buildLayer() Forces this view's layer to be created and this view to be rendered into its layer.
boolean	callOnClick() Directly call any attached OnClickListener.
boolean	canResolveLayoutDirection() Check if layout direction resolution can be done.
boolean	canResolveTextAlignment() Check if text alignment resolution can be done.
boolean	canResolveTextDirection() Check if text direction resolution can be done.
boolean	canScrollHorizontally(int direction) Check if this view can be scrolled horizontally in a certain direction.
boolean	canScrollVertically(int direction) Check if this view can be scrolled vertically in a certain direction.
void	cancelLongPress() Cancels a pending long press.
final void	cancelPendingInputEvents() Cancel any deferred high-level input events that were previously posted to the event queue.
boolean	checkInputConnectionProxy(View view) Called by the `InputMethodManager` when a view who is not the current input connection target is trying to make a call on the manager.
void	clearAnimation() Cancels any animations for this view.
void	clearFocus() Called when this view wants to give up focus.
static int	combineMeasuredStates(int curState, int newState) Merge two states as returned by `getMeasuredState()`.
int	computeHorizontalScrollExtent() Compute the horizontal extent of the horizontal scrollbar's thumb within the horizontal range.
int	computeHorizontalScrollOffset() Compute the horizontal offset of the horizontal scrollbar's thumb within the horizontal range.
int	computeHorizontalScrollRange() Compute the horizontal range that the horizontal scrollbar represents.
void	computeScroll() Called by a parent to request that a child update its values for mScrollX and mScrollY if necessary.
int	computeVerticalScrollExtent() Compute the vertical extent of the vertical scrollbar's thumb within the vertical range.
int	computeVerticalScrollOffset() Compute the vertical offset of the vertical scrollbar's thumb within the horizontal range.
int	computeVerticalScrollRange() Compute the vertical range that the vertical scrollbar represents.
AccessibilityNodeInfo	createAccessibilityNodeInfo() Returns an `AccessibilityNodeInfo` representing this view from the point of view of an `AccessibilityService`.
void	createContextMenu(ContextMenu menu) Show the context menu for this view.
void	destroyDrawingCache() Frees the resources used by the drawing cache.
WindowInsets	dispatchApplyWindowInsets(WindowInsets insets) Request to apply the given window insets to this view or another view in its subtree.
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.
void	dispatchDraw(Canvas canvas) Called by draw to draw the child views.
boolean	dispatchGenericFocusedEvent(MotionEvent event) Dispatch a generic motion event to the currently focused view.
boolean	dispatchGenericMotionEvent(MotionEvent event) Dispatch a generic motion event.
boolean	dispatchGenericPointerEvent(MotionEvent event) Dispatch a generic motion event to the view under the first pointer.
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.
boolean	dispatchNestedFling(float velocityX, float velocityY, boolean consumed) Dispatch a fling to a nested scrolling parent.
boolean	dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) Dispatch one step of a nested scroll in progress before this view consumes any portion of it.
boolean	dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow) Dispatch one step of a nested scroll in progress.
boolean	dispatchPopulateAccessibilityEvent(AccessibilityEvent event) Dispatches an `AccessibilityEvent` to the `View` first and then to its children for adding their text content to the event.
void	dispatchRestoreInstanceState(SparseArray<Parcelable> container) Called by `restoreHierarchyState(android.util.SparseArray)` to retrieve the state for this view and its children.
void	dispatchSaveInstanceState(SparseArray<Parcelable> container) Called by `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.
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	dispatchSystemUiVisibilityChanged(int visibility) Dispatch callbacks to `setOnSystemUiVisibilityChangeListener(View.OnSystemUiVisibilityChangeListener)` down the view hierarchy.
boolean	dispatchTouchEvent(MotionEvent event) 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.
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 `onWindowSystemUiVisibilityChanged(int)` down the view hierarchy.
void	dispatchWindowVisibilityChanged(int visibility) Dispatch a window visibility change down the view hierarchy.
void	draw(Canvas canvas) Manually render this view (and all of its children) to the given Canvas.
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.
View	findFocus() Find the view in the hierarchy rooted at this view that currently has focus.
final View	findViewById(int id) Look for a child view with the given id.
final View	findViewWithTag(Object tag) Look for a child view with the given tag.
void	findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) Finds the Views that contain given text.
boolean	fitSystemWindows(Rect insets) This method is deprecated. As of API XX use `dispatchApplyWindowInsets(WindowInsets)` to apply insets to views. Views should override `onApplyWindowInsets(WindowInsets)` or use `setOnApplyWindowInsetsListener(android.view.View.OnApplyWindowInsetsListener)` to implement handling their own insets.
View	focusSearch(int direction) Find the nearest view in the specified direction that can take focus.
void	forceLayout() Forces this view to be laid out during the next layout pass.
static int	generateViewId() Generate a value suitable for use in `setId(int)`.
int	getAccessibilityLiveRegion() Gets the live region mode for this View.
AccessibilityNodeProvider	getAccessibilityNodeProvider() Gets the provider for managing a virtual view hierarchy rooted at this View and reported to `AccessibilityService`s that explore the window content.
float	getAlpha() The opacity of the view.
Animation	getAnimation() Get the animation currently associated with this view.
IBinder	getApplicationWindowToken() Retrieve a unique token identifying the top-level "real" window of the window that this view is attached to.
Drawable	getBackground() Gets the background drawable
int	getBaseline() Return the offset of the widget's text baseline from the widget's top boundary.
final int	getBottom() Bottom position of this view relative to its parent.
float	getBottomFadingEdgeStrength() Returns the strength, or intensity, of the bottom faded edge.
int	getBottomPaddingOffset() Amount by which to extend the bottom fading region.
float	getCameraDistance() Gets the distance along the Z axis from the camera to this view.
Rect	getClipBounds() Returns a copy of the current `clipBounds`.
final boolean	getClipToOutline() Returns whether the Outline should be used to clip the contents of the View.
CharSequence	getContentDescription() Gets the `View` description.
final Context	getContext() Returns the context the view is running in, through which it can access the current theme, resources, etc.
ContextMenu.ContextMenuInfo	getContextMenuInfo() Views should implement this if they have extra information to associate with the context menu.
static int	getDefaultSize(int size, int measureSpec) Utility to return a default size.
Display	getDisplay() Gets the logical display to which the view's window has been attached.
final int[]	getDrawableState() Return an array of resource IDs of the drawable states representing the current state of the view.
Bitmap	getDrawingCache(boolean autoScale) Returns the bitmap in which this view drawing is cached.
Bitmap	getDrawingCache() Calling this method is equivalent to calling `getDrawingCache(false)`.
int	getDrawingCacheBackgroundColor()
int	getDrawingCacheQuality() Returns the quality of the drawing cache.
void	getDrawingRect(Rect outRect) Return the visible drawing bounds of your view.
long	getDrawingTime() Return the time at which the drawing of the view hierarchy started.
float	getElevation() The base elevation of this view relative to its parent, in pixels.
boolean	getFilterTouchesWhenObscured() Gets whether the framework should discard touches when the view's window is obscured by another visible window.
boolean	getFitsSystemWindows() Check for state of `setFitsSystemWindows(boolean)`.
ArrayList<View>	getFocusables(int direction) Find and return all focusable views that are descendants of this view, possibly including this view if it is focusable itself.
void	getFocusedRect(Rect r) When a view has focus and the user navigates away from it, the next view is searched for starting from the rectangle filled in by this method.
boolean	getGlobalVisibleRect(Rect r, Point globalOffset) If some part of this view is not clipped by any of its parents, then return that area in r in global (root) coordinates.
final boolean	getGlobalVisibleRect(Rect r)
Handler	getHandler()
final int	getHeight() Return the height of your view.
void	getHitRect(Rect outRect) Hit rectangle in parent's coordinates
int	getHorizontalFadingEdgeLength() Returns the size of the horizontal faded edges used to indicate that more content in this view is visible.
int	getHorizontalScrollbarHeight() Returns the height of the horizontal scrollbar.
int	getId() Returns this view's identifier.
int	getImportantForAccessibility() Gets the mode for determining whether this View is important for accessibility which is if it fires accessibility events and if it is reported to accessibility services that query the screen.
boolean	getKeepScreenOn() Returns whether the screen should remain on, corresponding to the current value of `KEEP_SCREEN_ON`.
KeyEvent.DispatcherState	getKeyDispatcherState() Return the global `KeyEvent.DispatcherState` for this view's window.
int	getLabelFor() Gets the id of a view for which this view serves as a label for accessibility purposes.
int	getLayerType() Indicates what type of layer is currently associated with this view.
int	getLayoutDirection() Returns the resolved layout direction for this view.
ViewGroup.LayoutParams	getLayoutParams() Get the LayoutParams associated with this view.
final int	getLeft() Left position of this view relative to its parent.
float	getLeftFadingEdgeStrength() Returns the strength, or intensity, of the left faded edge.
int	getLeftPaddingOffset() Amount by which to extend the left fading region.
final boolean	getLocalVisibleRect(Rect r)
void	getLocationInWindow(int[] location) Computes the coordinates of this view in its window.
void	getLocationOnScreen(int[] location) Computes the coordinates of this view on the screen.
Matrix	getMatrix() The transform matrix of this view, which is calculated based on the current roation, scale, and pivot properties.
final int	getMeasuredHeight() Like `getMeasuredHeightAndState()`, but only returns the raw width component (that is the result is masked by `MEASURED_SIZE_MASK`).
final int	getMeasuredHeightAndState() Return the full height measurement information for this view as computed by the most recent call to `measure(int, int)`.
final int	getMeasuredState() Return only the state bits of `getMeasuredWidthAndState()` and `getMeasuredHeightAndState()`, combined into one integer.
final int	getMeasuredWidth() Like `getMeasuredWidthAndState()`, but only returns the raw width component (that is the result is masked by `MEASURED_SIZE_MASK`).
final int	getMeasuredWidthAndState() Return the full width measurement information for this view as computed by the most recent call to `measure(int, int)`.
int	getMinimumHeight() Returns the minimum height of the view.
int	getMinimumWidth() Returns the minimum width of the view.
int	getNextFocusDownId() Gets the id of the view to use when the next focus is `FOCUS_DOWN`.
int	getNextFocusForwardId() Gets the id of the view to use when the next focus is `FOCUS_FORWARD`.
int	getNextFocusLeftId() Gets the id of the view to use when the next focus is `FOCUS_LEFT`.
int	getNextFocusRightId() Gets the id of the view to use when the next focus is `FOCUS_RIGHT`.
int	getNextFocusUpId() Gets the id of the view to use when the next focus is `FOCUS_UP`.
View.OnFocusChangeListener	getOnFocusChangeListener() Returns the focus-change callback registered for this view.
int	getOverScrollMode() Returns the over-scroll mode for this view.
ViewOverlay	getOverlay() Returns the overlay for this view, creating it if it does not yet exist.
int	getPaddingBottom() Returns the bottom padding of this view.
int	getPaddingEnd() Returns the end padding of this view depending on its resolved layout direction.
int	getPaddingLeft() Returns the left padding of this view.
int	getPaddingRight() Returns the right padding of this view.
int	getPaddingStart() Returns the start padding of this view depending on its resolved layout direction.
int	getPaddingTop() Returns the top padding of this view.
final ViewParent	getParent() Gets the parent of this view.
ViewParent	getParentForAccessibility() Gets the parent for accessibility purposes.
float	getPivotX() The x location of the point around which the view is `rotated` and `scaled`.
float	getPivotY() The y location of the point around which the view is `rotated` and `scaled`.
Resources	getResources() Returns the resources associated with this view.
final int	getRight() Right position of this view relative to its parent.
float	getRightFadingEdgeStrength() Returns the strength, or intensity, of the right faded edge.
int	getRightPaddingOffset() Amount by which to extend the right fading region.
View	getRootView() Finds the topmost view in the current view hierarchy.
float	getRotation() The degrees that the view is rotated around the pivot point.
float	getRotationX() The degrees that the view is rotated around the horizontal axis through the pivot point.
float	getRotationY() The degrees that the view is rotated around the vertical axis through the pivot point.
float	getScaleX() The amount that the view is scaled in x around the pivot point, as a proportion of the view's unscaled width.
float	getScaleY() The amount that the view is scaled in y around the pivot point, as a proportion of the view's unscaled height.
int	getScrollBarDefaultDelayBeforeFade() Returns the delay before scrollbars fade.
int	getScrollBarFadeDuration() Returns the scrollbar fade duration.
int	getScrollBarSize() Returns the scrollbar size.
int	getScrollBarStyle() Returns the current scrollbar style.
final int	getScrollX() Return the scrolled left position of this view.
final int	getScrollY() Return the scrolled top position of this view.
int	getSolidColor() Override this if your view is known to always be drawn on top of a solid color background, and needs to draw fading edges.
StateListAnimator	getStateListAnimator() Returns the current StateListAnimator if exists.
int	getSuggestedMinimumHeight() Returns the suggested minimum height that the view should use.
int	getSuggestedMinimumWidth() Returns the suggested minimum width that the view should use.
int	getSystemUiVisibility() Returns the last `setSystemUiVisibility(int)` that this view has requested.
Object	getTag(int key) Returns the tag associated with this view and the specified key.
Object	getTag() Returns this view's tag.
int	getTextAlignment() Return the resolved text alignment.
int	getTextDirection() Return the resolved text direction.
final int	getTop() Top position of this view relative to its parent.
float	getTopFadingEdgeStrength() Returns the strength, or intensity, of the top faded edge.
int	getTopPaddingOffset() Amount by which to extend the top fading region.
TouchDelegate	getTouchDelegate() Gets the TouchDelegate for this View.
ArrayList<View>	getTouchables() Find and return all touchable views that are descendants of this view, possibly including this view if it is touchable itself.
float	getTranslationX() The horizontal location of this view relative to its `left` position.
float	getTranslationY() The vertical location of this view relative to its `top` position.
float	getTranslationZ() The depth location of this view relative to its `elevation`.
int	getVerticalFadingEdgeLength() Returns the size of the vertical faded edges used to indicate that more content in this view is visible.
int	getVerticalScrollbarPosition()
int	getVerticalScrollbarWidth() Returns the width of the vertical scrollbar.
String	getViewName() Returns the name of the View to be used to identify Views in Transitions.
ViewTreeObserver	getViewTreeObserver() Returns the ViewTreeObserver for this view's hierarchy.
int	getVisibility() Returns the visibility status for this view.
final int	getWidth() Return the width of the your view.
int	getWindowAttachCount()
WindowId	getWindowId() Retrieve the `WindowId` for the window this view is currently attached to.
int	getWindowSystemUiVisibility() Returns the current system UI visibility that is currently set for the entire window.
IBinder	getWindowToken() Retrieve a unique token identifying the window this view is attached to.
int	getWindowVisibility() Returns the current visibility of the window this view is attached to (either `GONE`, `INVISIBLE`, or `VISIBLE`).
void	getWindowVisibleDisplayFrame(Rect outRect) Retrieve the overall visible display size in which the window this view is attached to has been positioned in.
float	getX() The visual x position of this view, in pixels.
float	getY() The visual y position of this view, in pixels.
float	getZ() The visual z position of this view, in pixels.
boolean	hasFocus() Returns true if this view has focus iteself, or is the ancestor of the view that has focus.
boolean	hasFocusable() Returns true if this view is focusable or if it contains a reachable View for which `hasFocusable()` returns true.
boolean	hasNestedScrollingParent() Returns true if this view has a nested scrolling parent.
boolean	hasOnClickListeners() Return whether this view has an attached OnClickListener.
boolean	hasOverlappingRendering() Returns whether this View has content which overlaps.
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.
boolean	hasWindowFocus() Returns true if this view is in a window that currently has window focus.
static View	inflate(Context context, int resource, ViewGroup root) Inflate a view from an XML resource.
void	initializeFadingEdge(TypedArray a) Initializes the fading edges from a given set of styled attributes.
void	initializeScrollbars(TypedArray a) Initializes the scrollbars from a given set of styled attributes.
void	invalidate(Rect dirty) Mark the area defined by dirty as needing to be drawn.
void	invalidate(int l, int t, int r, int b) Mark the area defined by the rect (l,t,r,b) as needing to be drawn.
void	invalidate() Invalidate the whole view.
void	invalidateDrawable(Drawable drawable) Invalidates the specified Drawable.
boolean	isAccessibilityFocused() Returns whether this View is accessibility focused.
boolean	isActivated() Indicates the activation state of this view.
boolean	isAttachedToWindow() Returns true if this view is currently attached to a window.
boolean	isClickable() Indicates whether this view reacts to click events or not.
boolean	isDirty() True if this view has changed since the last time being drawn.
boolean	isDrawingCacheEnabled() Indicates whether the drawing cache is enabled for this view.
boolean	isDuplicateParentStateEnabled() Indicates whether this duplicates its drawable state from its parent.
boolean	isEnabled() Returns the enabled status for this view.
final boolean	isFocusable() Returns whether this View is able to take focus.
final boolean	isFocusableInTouchMode() When a view is focusable, it may not want to take focus when in touch mode.
boolean	isFocused() Returns true if this view has focus
boolean	isHapticFeedbackEnabled()
boolean	isHardwareAccelerated() Indicates whether this view is attached to a hardware accelerated window or not.
boolean	isHorizontalFadingEdgeEnabled() Indicate whether the horizontal edges are faded when the view is scrolled horizontally.
boolean	isHorizontalScrollBarEnabled() Indicate whether the horizontal scrollbar should be drawn or not.
boolean	isHovered() Returns true if the view is currently hovered.
boolean	isImportantForAccessibility() Computes whether this view should be exposed for accessibility.
boolean	isInEditMode() Indicates whether this View is currently in edit mode.
boolean	isInLayout() Returns whether the view hierarchy is currently undergoing a layout pass.
boolean	isInTouchMode() Returns whether the device is currently in touch mode.
boolean	isLaidOut() Returns true if this view has been through at least one layout since it was last attached to or detached from a window.
boolean	isLayoutDirectionResolved()
boolean	isLayoutRequested() Indicates whether or not this view's layout will be requested during the next hierarchy layout pass.
boolean	isLongClickable() Indicates whether this view reacts to long click events or not.
boolean	isNestedScrollingEnabled() Returns true if nested scrolling is enabled for this view.
boolean	isOpaque() Indicates whether this View is opaque.
boolean	isPaddingOffsetRequired() If the View draws content inside its padding and enables fading edges, it needs to support padding offsets.
boolean	isPaddingRelative() Return if the padding as been set thru relative values `setPaddingRelative(int, int, int, int)` or thru
boolean	isPressed() Indicates whether the view is currently in pressed state.
boolean	isSaveEnabled() Indicates whether this view will save its state (that is, whether its `onSaveInstanceState()` method will be called).
boolean	isSaveFromParentEnabled() Indicates whether the entire hierarchy under this view will save its state when a state saving traversal occurs from its parent.
boolean	isScrollContainer() Indicates whether this view is one of the set of scrollable containers in its window.
boolean	isScrollbarFadingEnabled() Returns true if scrollbars will fade when this view is not scrolling
boolean	isSelected() Indicates the selection state of this view.
boolean	isShown() Returns the visibility of this view and all of its ancestors
boolean	isSoundEffectsEnabled()
boolean	isTextAlignmentResolved()
boolean	isTextDirectionResolved()
boolean	isVerticalFadingEdgeEnabled() Indicate whether the vertical edges are faded when the view is scrolled horizontally.
boolean	isVerticalScrollBarEnabled() Indicate whether the vertical scrollbar should be drawn or not.
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 This is the second phase of the layout mechanism.
final void	measure(int widthMeasureSpec, int heightMeasureSpec) This is called to find out how big a view should be.
static int[]	mergeDrawableStates(int[] baseState, int[] additionalState) Merge your own state values in `additionalState` into the base state values `baseState` that were returned by `onCreateDrawableState(int)`.
void	offsetLeftAndRight(int offset) Offset this view's horizontal location by the specified amount of pixels.
void	offsetTopAndBottom(int offset) Offset this view's vertical location by the specified number of pixels.
void	onAnimationEnd() Invoked by a parent ViewGroup to notify the end of the animation currently associated with this view.
void	onAnimationStart() Invoked by a parent ViewGroup to notify the start of the animation currently associated with this view.
WindowInsets	onApplyWindowInsets(WindowInsets insets) Called when the view should apply `WindowInsets` according to its internal policy.
void	onAttachedToWindow() This is called when the view is attached to a window.
void	onCancelPendingInputEvents() Called as the result of a call to `cancelPendingInputEvents()` on this view or a parent view.
boolean	onCheckIsTextEditor() Check whether the called view is a text editor, in which case it would make sense to automatically display a soft input window for it.
void	onConfigurationChanged(Configuration newConfig) Called when the current configuration of the resources being used by the application have changed.
void	onCreateContextMenu(ContextMenu menu) Views should implement this if the view itself is going to add items to the context menu.
int[]	onCreateDrawableState(int extraSpace) Generate the new `Drawable` state for this view.
InputConnection	onCreateInputConnection(EditorInfo outAttrs) Create a new InputConnection for an InputMethod to interact with the view.
void	onDetachedFromWindow() This is called when the view is detached from a window.
void	onDisplayHint(int hint) Gives this view a hint about whether is displayed or not.
boolean	onDragEvent(DragEvent event) Handles drag events sent by the system following a call to `startDrag()`.
void	onDraw(Canvas canvas) Implement this to do your drawing.
final void	onDrawScrollBars(Canvas canvas) Request the drawing of the horizontal and the vertical scrollbar.
boolean	onFilterTouchEventForSecurity(MotionEvent event) Filter the touch event to apply security policies.
void	onFinishInflate() Finalize inflating a view from XML.
void	onFinishTemporaryDetach() Called after `onStartTemporaryDetach()` when the container is done changing the view.
void	onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) Called by the view system when the focus state of this view changes.
boolean	onGenericMotionEvent(MotionEvent event) Implement this method to handle generic motion events.
void	onHoverChanged(boolean hovered) Implement this method to handle hover state changes.
boolean	onHoverEvent(MotionEvent event) Implement this method to handle hover events.
void	onInitializeAccessibilityEvent(AccessibilityEvent event) Initializes an `AccessibilityEvent` with information about this View which is the event source.
void	onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) Initializes an `AccessibilityNodeInfo` with information about this view.
boolean	onKeyDown(int keyCode, KeyEvent event) Default implementation of `KeyEvent.Callback.onKeyDown()`: perform press of the view when `KEYCODE_DPAD_CENTER` or `KEYCODE_ENTER` is released, if the view is enabled and clickable.
boolean	onKeyLongPress(int keyCode, KeyEvent event) Default implementation of `KeyEvent.Callback.onKeyLongPress()`: always returns false (doesn't handle the event).
boolean	onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) Default implementation of `KeyEvent.Callback.onKeyMultiple()`: always returns false (doesn't handle the event).
boolean	onKeyPreIme(int keyCode, KeyEvent event) Handle a key event before it is processed by any input method associated with the view hierarchy.
boolean	onKeyShortcut(int keyCode, KeyEvent event) Called on the focused view when a key shortcut event is not handled.
boolean	onKeyUp(int keyCode, KeyEvent event) Default implementation of `KeyEvent.Callback.onKeyUp()`: perform clicking of the view when `KEYCODE_DPAD_CENTER` or `KEYCODE_ENTER` is released.
void	onLayout(boolean changed, int left, int top, int right, int bottom) Called from layout when this view should assign a size and position to each of its children.
void	onMeasure(int widthMeasureSpec, int heightMeasureSpec) Measure the view and its content to determine the measured width and the measured height.
void	onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) Called by `overScrollBy(int, int, int, int, int, int, int, int, boolean)` to respond to the results of an over-scroll operation.
void	onPopulateAccessibilityEvent(AccessibilityEvent event) Called from `dispatchPopulateAccessibilityEvent(AccessibilityEvent)` giving a chance to this View to populate the accessibility event with its text content.
void	onRestoreInstanceState(Parcelable state) Hook allowing a view to re-apply a representation of its internal state that had previously been generated by `onSaveInstanceState()`.
void	onRtlPropertiesChanged(int layoutDirection) Called when any RTL property (layout direction or text direction or text alignment) has been changed.
Parcelable	onSaveInstanceState() Hook allowing a view to generate a representation of its internal state that can later be used to create a new instance with that same state.
void	onScreenStateChanged(int screenState) This method is called whenever the state of the screen this view is attached to changes.
void	onScrollChanged(int l, int t, int oldl, int oldt) This is called in response to an internal scroll in this view (i.e., the view scrolled its own contents).
boolean	onSetAlpha(int alpha) Invoked if there is a Transform that involves alpha.
void	onSizeChanged(int w, int h, int oldw, int oldh) This is called during layout when the size of this view has changed.
void	onStartTemporaryDetach() This is called when a container is going to temporarily detach a child, with `ViewGroup.detachViewFromParent`.
boolean	onTouchEvent(MotionEvent event) Implement this method to handle touch screen motion events.
boolean	onTrackballEvent(MotionEvent event) Implement this method to handle trackball motion events.
void	onVisibilityChanged(View changedView, int visibility) Called when the visibility of the view or an ancestor of the view is changed.
void	onWindowFocusChanged(boolean hasWindowFocus) Called when the window containing this view gains or loses focus.
void	onWindowSystemUiVisibilityChanged(int visible) Override to find out when the window's requested system UI visibility has changed, that is the value returned by `getWindowSystemUiVisibility()`.
void	onWindowVisibilityChanged(int visibility) Called when the window containing has change its visibility (between `GONE`, `INVISIBLE`, and `VISIBLE`).
boolean	overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) Scroll the view with standard behavior for scrolling beyond the normal content boundaries.
boolean	performAccessibilityAction(int action, Bundle arguments) Performs the specified accessibility action on the view.
boolean	performClick() Call this view's OnClickListener, if it is defined.
boolean	performHapticFeedback(int feedbackConstant) BZZZTT!!1! Provide haptic feedback to the user for this view.
boolean	performHapticFeedback(int feedbackConstant, int flags) BZZZTT!!1! Like `performHapticFeedback(int)`, with additional options.
boolean	performLongClick() Call this view's OnLongClickListener, if it is defined.
void	playSoundEffect(int soundConstant) Play a sound effect for this view.
boolean	post(Runnable action) Causes the Runnable to be added to the message queue.
boolean	postDelayed(Runnable action, long delayMillis) Causes the Runnable to be added to the message queue, to be run after the specified amount of time elapses.
void	postInvalidate(int left, int top, int right, int bottom) Cause an invalidate of the specified area to happen on a subsequent cycle through the event loop.
void	postInvalidate() Cause an invalidate to happen on a subsequent cycle through the event loop.
void	postInvalidateDelayed(long delayMilliseconds, int left, int top, int right, int bottom) Cause an invalidate of the specified area to happen on a subsequent cycle through the event loop.
void	postInvalidateDelayed(long delayMilliseconds) Cause an invalidate to happen on a subsequent cycle through the event loop.
void	postInvalidateOnAnimation(int left, int top, int right, int bottom) Cause an invalidate of the specified area to happen on the next animation time step, typically the next display frame.
void	postInvalidateOnAnimation() Cause an invalidate to happen on the next animation time step, typically the next display frame.
void	postOnAnimation(Runnable action) Causes the Runnable to execute on the next animation time step.
void	postOnAnimationDelayed(Runnable action, long delayMillis) Causes the Runnable to execute on the next animation time step, after the specified amount of time elapses.
void	refreshDrawableState() Call this to force a view to update its drawable state.
boolean	removeCallbacks(Runnable action) Removes the specified Runnable from the message queue.
void	removeOnAttachStateChangeListener(View.OnAttachStateChangeListener listener) Remove a listener for attach state changes.
void	removeOnLayoutChangeListener(View.OnLayoutChangeListener listener) Remove a listener for layout changes.
void	requestApplyInsets() Ask that a new dispatch of `onApplyWindowInsets(WindowInsets)` be performed.
void	requestFitSystemWindows() This method is deprecated. Use `requestApplyInsets()` for newer platform versions.
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.
final boolean	requestFocus(int direction) Call this to try to give focus to a specific view or to one of its descendants and give it a hint about what direction focus is heading.
final boolean	requestFocus() Call this to try to give focus to a specific view or to one of its descendants.
final boolean	requestFocusFromTouch() Call this to try to give focus to a specific view or to one of its descendants.
void	requestLayout() Call this when something has changed which has invalidated the layout of this view.
boolean	requestRectangleOnScreen(Rect rectangle) Request that a rectangle of this view be visible on the screen, scrolling if necessary just enough.
boolean	requestRectangleOnScreen(Rect rectangle, boolean immediate) Request that a rectangle of this view be visible on the screen, scrolling if necessary just enough.
static int	resolveSize(int size, int measureSpec) Version of `resolveSizeAndState(int, int, int)` returning only the `MEASURED_SIZE_MASK` bits of the result.
static int	resolveSizeAndState(int size, int measureSpec, int childMeasuredState) Utility to reconcile a desired size and state, with constraints imposed by a MeasureSpec.
void	restoreHierarchyState(SparseArray<Parcelable> container) Restore this view hierarchy's frozen state from the given container.
void	saveHierarchyState(SparseArray<Parcelable> container) Store this view hierarchy's frozen state into the given container.
void	scheduleDrawable(Drawable who, Runnable what, long when) Schedules an action on a drawable to occur at a specified time.
void	scrollBy(int x, int y) Move the scrolled position of your view.
void	scrollTo(int x, int y) Set the scrolled position of your view.
void	sendAccessibilityEvent(int eventType) Sends an accessibility event of the given type.
void	sendAccessibilityEventUnchecked(AccessibilityEvent event) This method behaves exactly as `sendAccessibilityEvent(int)` but takes as an argument an empty `AccessibilityEvent` and does not perform a check whether accessibility is enabled.
void	setAccessibilityDelegate(View.AccessibilityDelegate delegate) Sets a delegate for implementing accessibility support via composition as opposed to inheritance.
void	setAccessibilityLiveRegion(int mode) Sets the live region mode for this view.
void	setActivated(boolean activated) Changes the activated state of this view.
void	setAlpha(float alpha) Sets the opacity of the view.
void	setAnimation(Animation animation) Sets the next animation to play for this view.
void	setBackground(Drawable background) Set the background to a given Drawable, or remove the background.
void	setBackgroundColor(int color) Sets the background color for this view.
void	setBackgroundDrawable(Drawable background) This method was deprecated in API level 16. use `setBackground(Drawable)` instead
void	setBackgroundResource(int resid) Set the background to a given resource.
final void	setBottom(int bottom) Sets the bottom position of this view relative to its parent.
void	setCameraDistance(float distance) Sets the distance along the Z axis (orthogonal to the X/Y plane on which views are drawn) from the camera to this view.
void	setClickable(boolean clickable) Enables or disables click events for this view.
void	setClipBounds(Rect clipBounds) Sets a rectangular area on this view to which the view will be clipped when it is drawn.
void	setClipToOutline(boolean clipToOutline) Sets whether the View's Outline should be used to clip the contents of the View.
void	setContentDescription(CharSequence contentDescription) Sets the `View` description.
void	setDrawingCacheBackgroundColor(int color) Setting a solid background color for the drawing cache's bitmaps will improve performance and memory usage.
void	setDrawingCacheEnabled(boolean enabled) Enables or disables the drawing cache.
void	setDrawingCacheQuality(int quality) Set the drawing cache quality of this view.
void	setDuplicateParentStateEnabled(boolean enabled) Enables or disables the duplication of the parent's state into this view.
void	setElevation(float elevation) Sets the base elevation of this view, in pixels.
void	setEnabled(boolean enabled) Set the enabled state of this view.
void	setFadingEdgeLength(int length) Set the size of the faded edge used to indicate that more content in this view is available.
void	setFilterTouchesWhenObscured(boolean enabled) Sets whether the framework should discard touches when the view's window is obscured by another visible window.
void	setFitsSystemWindows(boolean fitSystemWindows) Sets whether or not this view should account for system screen decorations such as the status bar and inset its content; that is, controlling whether the default implementation of `fitSystemWindows(Rect)` will be executed.
void	setFocusable(boolean focusable) Set whether this view can receive the focus.
void	setFocusableInTouchMode(boolean focusableInTouchMode) Set whether this view can receive focus while in touch mode.
void	setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) Set whether this view should have haptic feedback for events such as long presses.
void	setHasTransientState(boolean hasTransientState) Set whether this view is currently tracking transient state that the framework should attempt to preserve when possible.
void	setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) Define whether the horizontal edges should be faded when this view is scrolled horizontally.
void	setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) Define whether the horizontal scrollbar should be drawn or not.
void	setHovered(boolean hovered) Sets whether the view is currently hovered.
void	setId(int id) Sets the identifier for this view.
void	setImportantForAccessibility(int mode) Sets how to determine whether this view is important for accessibility which is if it fires accessibility events and if it is reported to accessibility services that query the screen.
void	setKeepScreenOn(boolean keepScreenOn) Controls whether the screen should remain on, modifying the value of `KEEP_SCREEN_ON`.
void	setLabelFor(int id) Sets the id of a view for which this view serves as a label for accessibility purposes.
void	setLayerPaint(Paint paint) Updates the `Paint` object used with the current layer (used only if the current layer type is not set to `LAYER_TYPE_NONE`).
void	setLayerType(int layerType, Paint paint) Specifies the type of layer backing this view.
void	setLayoutDirection(int layoutDirection) Set the layout direction for this view.
void	setLayoutParams(ViewGroup.LayoutParams params) Set the layout parameters associated with this view.
final void	setLeft(int left) Sets the left position of this view relative to its parent.
void	setLongClickable(boolean longClickable) Enables or disables long click events for this view.
final void	setMeasuredDimension(int measuredWidth, int measuredHeight) This method must be called by `onMeasure(int, int)` to store the measured width and measured height.
void	setMinimumHeight(int minHeight) Sets the minimum height of the view.
void	setMinimumWidth(int minWidth) Sets the minimum width of the view.
void	setNestedScrollingEnabled(boolean enabled) Enable or disable nested scrolling for this view.
void	setNextFocusDownId(int nextFocusDownId) Sets the id of the view to use when the next focus is `FOCUS_DOWN`.
void	setNextFocusForwardId(int nextFocusForwardId) Sets the id of the view to use when the next focus is `FOCUS_FORWARD`.
void	setNextFocusLeftId(int nextFocusLeftId) Sets the id of the view to use when the next focus is `FOCUS_LEFT`.
void	setNextFocusRightId(int nextFocusRightId) Sets the id of the view to use when the next focus is `FOCUS_RIGHT`.
void	setNextFocusUpId(int nextFocusUpId) Sets the id of the view to use when the next focus is `FOCUS_UP`.
void	setOnApplyWindowInsetsListener(View.OnApplyWindowInsetsListener listener) Set an `View.OnApplyWindowInsetsListener` to take over the policy for applying window insets to this view.
void	setOnClickListener(View.OnClickListener l) Register a callback to be invoked when this view is clicked.
void	setOnCreateContextMenuListener(View.OnCreateContextMenuListener l) Register a callback to be invoked when the context menu for this view is being built.
void	setOnDragListener(View.OnDragListener l) Register a drag event listener callback object for this View.
void	setOnFocusChangeListener(View.OnFocusChangeListener l) Register a callback to be invoked when focus of this view changed.
void	setOnGenericMotionListener(View.OnGenericMotionListener l) Register a callback to be invoked when a generic motion event is sent to this view.
void	setOnHoverListener(View.OnHoverListener l) Register a callback to be invoked when a hover event is sent to this view.
void	setOnKeyListener(View.OnKeyListener l) Register a callback to be invoked when a hardware key is pressed in this view.
void	setOnLongClickListener(View.OnLongClickListener l) Register a callback to be invoked when this view is clicked and held.
void	setOnSystemUiVisibilityChangeListener(View.OnSystemUiVisibilityChangeListener l) Set a listener to receive callbacks when the visibility of the system bar changes.
void	setOnTouchListener(View.OnTouchListener l) Register a callback to be invoked when a touch event is sent to this view.
void	setOutline(Outline outline) Sets the `Outline` of the view, which defines the shape of the shadow it casts, and enables outline clipping.
void	setOverScrollMode(int overScrollMode) Set the over-scroll mode for this view.
void	setPadding(int left, int top, int right, int bottom) Sets the padding.
void	setPaddingRelative(int start, int top, int end, int bottom) Sets the relative padding.
void	setPivotX(float pivotX) Sets the x location of the point around which the view is `rotated` and `scaled`.
void	setPivotY(float pivotY) Sets the y location of the point around which the view is `rotated` and `scaled`.
void	setPressed(boolean pressed) Sets the pressed state for this view.
final void	setRight(int right) Sets the right position of this view relative to its parent.
void	setRotation(float rotation) Sets the degrees that the view is rotated around the pivot point.
void	setRotationX(float rotationX) Sets the degrees that the view is rotated around the horizontal axis through the pivot point.
void	setRotationY(float rotationY) Sets the degrees that the view is rotated around the vertical axis through the pivot point.
void	setSaveEnabled(boolean enabled) Controls whether the saving of this view's state is enabled (that is, whether its `onSaveInstanceState()` method will be called).
void	setSaveFromParentEnabled(boolean enabled) Controls whether the entire hierarchy under this view will save its state when a state saving traversal occurs from its parent.
void	setScaleX(float scaleX) Sets the amount that the view is scaled in x around the pivot point, as a proportion of the view's unscaled width.
void	setScaleY(float scaleY) Sets the amount that the view is scaled in Y around the pivot point, as a proportion of the view's unscaled width.
void	setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) Define the delay before scrollbars fade.
void	setScrollBarFadeDuration(int scrollBarFadeDuration) Define the scrollbar fade duration.
void	setScrollBarSize(int scrollBarSize) Define the scrollbar size.
void	setScrollBarStyle(int style) Specify the style of the scrollbars.
void	setScrollContainer(boolean isScrollContainer) Change whether this view is one of the set of scrollable containers in its window.
void	setScrollX(int value) Set the horizontal scrolled position of your view.
void	setScrollY(int value) Set the vertical scrolled position of your view.
void	setScrollbarFadingEnabled(boolean fadeScrollbars) Define whether scrollbars will fade when the view is not scrolling.
void	setSelected(boolean selected) Changes the selection state of this view.
void	setSoundEffectsEnabled(boolean soundEffectsEnabled) Set whether this view should have sound effects enabled for events such as clicking and touching.
void	setStateListAnimator(StateListAnimator stateListAnimator) Attaches the provided StateListAnimator to this View.
void	setSystemUiVisibility(int visibility) Request that the visibility of the status bar or other screen/window decorations be changed.
void	setTag(int key, Object tag) Sets a tag associated with this view and a key.
void	setTag(Object tag) Sets the tag associated with this view.
void	setTextAlignment(int textAlignment) Set the text alignment.
void	setTextDirection(int textDirection) Set the text direction.
final void	setTop(int top) Sets the top position of this view relative to its parent.
void	setTouchDelegate(TouchDelegate delegate) Sets the TouchDelegate for this View.
void	setTranslationX(float translationX) Sets the horizontal location of this view relative to its `left` position.
void	setTranslationY(float translationY) Sets the vertical location of this view relative to its `top` position.
void	setTranslationZ(float translationZ) Sets the depth location of this view relative to its `elevation`.
void	setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) Define whether the vertical edges should be faded when this view is scrolled vertically.
void	setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) Define whether the vertical scrollbar should be drawn or not.
void	setVerticalScrollbarPosition(int position) Set the position of the vertical scroll bar.
final void	setViewName(String viewName) Sets the name of the View to be used to identify Views in Transitions.
void	setVisibility(int visibility) Set the enabled state of this view.
void	setWillNotCacheDrawing(boolean willNotCacheDrawing) When a View's drawing cache is enabled, drawing is redirected to an offscreen bitmap.
void	setWillNotDraw(boolean willNotDraw) If this view doesn't do any drawing on its own, set this flag to allow further optimizations.
void	setX(float x) Sets the visual x position of this view, in pixels.
void	setY(float y) Sets the visual y position of this view, in pixels.
void	setZ(float z) Sets the visual z position of this view, in pixels.
boolean	showContextMenu() Bring up the context menu for this view.
ActionMode	startActionMode(ActionMode.Callback callback) Start an action mode.
void	startAnimation(Animation animation) Start the specified animation now.
final boolean	startDrag(ClipData data, View.DragShadowBuilder shadowBuilder, Object myLocalState, int flags) Starts a drag and drop operation.
boolean	startNestedScroll(int axes) Begin a nestable scroll operation along the given axes.
void	stopNestedScroll() Stop a nested scroll in progress.
String	toString() Returns a string containing a concise, human-readable description of this object.
void	unscheduleDrawable(Drawable who) Unschedule any events associated with the given Drawable.
void	unscheduleDrawable(Drawable who, Runnable what) Cancels a scheduled action on a drawable.
boolean	verifyDrawable(Drawable who) If your view subclass is displaying its own Drawable objects, it should override this function and return true for any Drawable it is displaying.
boolean	willNotCacheDrawing() Returns whether or not this View can cache its drawing or not.
boolean	willNotDraw() Returns whether or not this View draws on its own.

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

From interface android.graphics.drawable.Drawable.Callback

From interface android.view.KeyEvent.Callback

From interface android.view.ViewManager

From interface android.view.ViewParent

abstract void	bringChildToFront(View child) Change the z order of the child so it's on top of all other children.
abstract boolean	canResolveLayoutDirection() Tells if this view parent can resolve the layout direction.
abstract boolean	canResolveTextAlignment() Tells if this view parent can resolve the text alignment.
abstract boolean	canResolveTextDirection() Tells if this view parent can resolve the text direction.
abstract void	childDrawableStateChanged(View child) This method is called on the parent when a child's drawable state has changed.
abstract void	childHasTransientStateChanged(View child, boolean hasTransientState) Called when a child view now has or no longer is tracking transient state.
abstract void	clearChildFocus(View child) Called when a child of this parent is giving up focus
abstract void	createContextMenu(ContextMenu menu) Have the parent populate the specified context menu if it has anything to add (and then recurse on its parent).
abstract View	focusSearch(View v, int direction) Find the nearest view in the specified direction that wants to take focus
abstract void	focusableViewAvailable(View v) Tells the parent that a new focusable view has become available.
abstract 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.
abstract int	getLayoutDirection() Return this view parent layout direction.
abstract ViewParent	getParent() Returns the parent if it exists, or null.
abstract ViewParent	getParentForAccessibility() Gets the parent of a given View for accessibility.
abstract int	getTextAlignment() Return this view parent text alignment.
abstract int	getTextDirection() Return this view parent text direction.
abstract void	invalidateChild(View child, Rect r) All or part of a child is dirty and needs to be redrawn.
abstract ViewParent	invalidateChildInParent(int[] location, Rect r) All or part of a child is dirty and needs to be redrawn.
abstract boolean	isLayoutDirectionResolved() Tells if this view parent layout direction is resolved.
abstract boolean	isLayoutRequested() Indicates whether layout was requested on this view parent.
abstract boolean	isTextAlignmentResolved() Tells if this view parent text alignment is resolved.
abstract boolean	isTextDirectionResolved() Tells if this view parent text direction is resolved.
abstract void	notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) Notifies a view parent that the accessibility state of one of its descendants has changed and that the structure of the subtree is different.
abstract boolean	onNestedFling(View target, float velocityX, float velocityY, boolean consumed) Request a fling from a nested scroll.
abstract void	onNestedPreScroll(View target, int dx, int dy, int[] consumed) React to a nested scroll in progress before the target view consumes a portion of the scroll.
abstract void	onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) React to a nested scroll in progress.
abstract void	onNestedScrollAccepted(View child, View target, int nestedScrollAxes) React to the successful claiming of a nested scroll operation.
abstract boolean	onStartNestedScroll(View child, View target, int nestedScrollAxes) React to a descendant view initiating a nestable scroll operation, claiming the nested scroll operation if appropriate.
abstract void	onStopNestedScroll(View target) React to a nested scroll operation ending.
abstract void	recomputeViewAttributes(View child) Tell view hierarchy that the global view attributes need to be re-evaluated.
abstract void	requestChildFocus(View child, View focused) Called when a child of this parent wants focus
abstract 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.
abstract void	requestDisallowInterceptTouchEvent(boolean disallowIntercept) Called when a child does not want this parent and its ancestors to intercept touch events with `onInterceptTouchEvent(MotionEvent)`.
abstract void	requestFitSystemWindows() Ask that a new dispatch of `View.fitSystemWindows(Rect)` be performed.
abstract void	requestLayout() Called when something has changed which has invalidated the layout of a child of this view parent.
abstract boolean	requestSendAccessibilityEvent(View child, AccessibilityEvent event) Called by a child to request from its parent to send an `AccessibilityEvent`.
abstract void	requestTransparentRegion(View child) Called when a child wants the view hierarchy to gather and report transparent regions to the window compositor.
abstract boolean	showContextMenuForChild(View originalView) Bring up a context menu for the specified view or its ancestors.
abstract ActionMode	startActionModeForChild(View originalView, ActionMode.Callback callback) Start an action mode for the specified view.

From interface android.view.accessibility.AccessibilityEventSource

XML Attributes

android:baselineAligned

When set to false, prevents the layout from aligning its children's baselines. This attribute is particularly useful when the children use different values for gravity. The default value is true.

Must be a boolean value, either "true" or "false".

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

This corresponds to the global attribute resource symbol baselineAligned.

Related Methods

setBaselineAligned(boolean)

android:baselineAlignedChildIndex

When a linear layout is part of another layout that is baseline aligned, it can specify which of its children to baseline align to (that is, which child TextView).

Must be an integer value, such as "100".

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

This corresponds to the global attribute resource symbol baselineAlignedChildIndex.

Related Methods

setBaselineAlignedChildIndex(int)

android:divider

Drawable to use as a vertical divider between buttons.

May be a reference to another resource, in the form "@[+][package:]type:name" or to a theme attribute in the form "?[package:][type:]name".

May be a color value, in the form of "#rgb", "#argb", "#rrggbb", or "#aarrggbb".

This corresponds to the global attribute resource symbol divider.

Related Methods

setDividerDrawable(Drawable)

android:gravity

Specifies how an object should position its content, on both the X and Y axes, within its own bounds.

Must be one or more (separated by '|') of the following constant values.

Constant	Value	Description
`top`	0x30	Push object to the top of its container, not changing its size.
`bottom`	0x50	Push object to the bottom of its container, not changing its size.
`left`	0x03	Push object to the left of its container, not changing its size.
`right`	0x05	Push object to the right of its container, not changing its size.
`center_vertical`	0x10	Place object in the vertical center of its container, not changing its size.
`fill_vertical`	0x70	Grow the vertical size of the object if needed so it completely fills its container.
`center_horizontal`	0x01	Place object in the horizontal center of its container, not changing its size.
`fill_horizontal`	0x07	Grow the horizontal size of the object if needed so it completely fills its container.
`center`	0x11	Place the object in the center of its container in both the vertical and horizontal axis, not changing its size.
`fill`	0x77	Grow the horizontal and vertical size of the object if needed so it completely fills its container.
`clip_vertical`	0x80	Additional option that can be set to have the top and/or bottom edges of the child clipped to its container's bounds. The clip will be based on the vertical gravity: a top gravity will clip the bottom edge, a bottom gravity will clip the top edge, and neither will clip both edges.
`clip_horizontal`	0x08	Additional option that can be set to have the left and/or right edges of the child clipped to its container's bounds. The clip will be based on the horizontal gravity: a left gravity will clip the right edge, a right gravity will clip the left edge, and neither will clip both edges.
`start`	0x00800003	Push object to the beginning of its container, not changing its size.
`end`	0x00800005	Push object to the end of its container, not changing its size.

This corresponds to the global attribute resource symbol gravity.

Related Methods

setGravity(int)

android:measureWithLargestChild

When set to true, all children with a weight will be considered having the minimum size of the largest child. If false, all children are measured normally.

Must be a boolean value, either "true" or "false".

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

This corresponds to the global attribute resource symbol measureWithLargestChild.

Related Methods

setMeasureWithLargestChildEnabled(boolean)

android:orientation

Should the layout be a column or a row? Use "horizontal" for a row, "vertical" for a column. The default is horizontal.

Must be one of the following constant values.

Constant	Value	Description
`horizontal`	0	Defines an horizontal widget.
`vertical`	1	Defines a vertical widget.

This corresponds to the global attribute resource symbol orientation.

Related Methods

setOrientation(int)

android:weightSum

Defines the maximum weight sum. If unspecified, the sum is computed by adding the layout_weight of all of the children. This can be used for instance to give a single child 50% of the total available space by giving it a layout_weight of 0.5 and setting the weightSum to 1.0.

Must be a floating point value, such as "1.2".

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

This corresponds to the global attribute resource symbol weightSum.

Related Methods

Constants

public static final int HORIZONTAL

Added in API level 1

Constant Value: 0 (0x00000000)

public static final int SHOW_DIVIDER_BEGINNING

Added in API level 11

Show a divider at the beginning of the group.

Constant Value: 1 (0x00000001)

public static final int SHOW_DIVIDER_END

Added in API level 11

Show a divider at the end of the group.

Constant Value: 4 (0x00000004)

public static final int SHOW_DIVIDER_MIDDLE

Added in API level 11

Show dividers between each item in the group.

Constant Value: 2 (0x00000002)

public static final int SHOW_DIVIDER_NONE

Added in API level 11

Don't show any dividers.

Constant Value: 0 (0x00000000)

public static final int VERTICAL

Added in API level 1

Constant Value: 1 (0x00000001)

Public Constructors

public LinearLayout (Context context)

Added in API level 1

public LinearLayout (Context context, AttributeSet attrs)

Added in API level 1

public LinearLayout (Context context, AttributeSet attrs, int defStyleAttr)

Added in API level 11

public LinearLayout (Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)

Public Methods

public LinearLayout.LayoutParams generateLayoutParams (AttributeSet attrs)

Added in API level 1

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

public int getBaseline ()

Added in API level 1

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

Returns

the offset of the baseline within the widget's bounds or -1 if baseline alignment is not supported

public int getBaselineAlignedChildIndex ()

Added in API level 1

Returns

The index of the child that will be used if this layout is part of a larger layout that is baseline aligned, or -1 if none has been set.

public Drawable getDividerDrawable ()

Added in API level 16

Related XML Attributes

android:divider

Returns

the divider Drawable that will divide each item.

public int getDividerPadding ()

Added in API level 14

Get the padding size used to inset dividers in pixels

public int getOrientation ()

Added in API level 1

Returns the current orientation.

Returns

either HORIZONTAL or VERTICAL

public int getShowDividers ()

Added in API level 11

Returns

A flag set indicating how dividers should be shown around items.

public float getWeightSum ()

Added in API level 1

Returns the desired weights sum.

Returns

A number greater than 0.0f if the weight sum is defined, or a number lower than or equals to 0.0f if not weight sum is to be used.

public boolean isBaselineAligned ()

Added in API level 1

Indicates whether widgets contained within this layout are aligned on their baseline or not.

Returns

true when widgets are baseline-aligned, false otherwise

public boolean isMeasureWithLargestChildEnabled ()

Added in API level 11

When true, all children with a weight will be considered having the minimum size of the largest child. If false, all children are measured normally.

Related XML Attributes

android:measureWithLargestChild

Returns

True to measure children with a weight using the minimum size of the largest child, false otherwise.

public void onInitializeAccessibilityEvent (AccessibilityEvent event)

Added in API level 14

Initializes an AccessibilityEvent with information about this View which is the event source. In other words, the source of an accessibility event is the view whose state change triggered firing the event.

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

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

If an View.AccessibilityDelegate has been specified via calling setAccessibilityDelegate(AccessibilityDelegate) its onInitializeAccessibilityEvent(View, AccessibilityEvent) is responsible for handling this call.

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

Parameters

event	The event to initialize.

public void onInitializeAccessibilityNodeInfo (AccessibilityNodeInfo info)

Added in API level 14

Initializes an AccessibilityNodeInfo with information about this view. The base implementation sets:

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

If an View.AccessibilityDelegate has been specified via calling setAccessibilityDelegate(AccessibilityDelegate) its onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo) is responsible for handling this call.

Parameters

info	The instance to initialize.

public void setBaselineAligned (boolean baselineAligned)

Added in API level 1

Defines whether widgets contained in this layout are baseline-aligned or not.

Related XML Attributes

android:baselineAligned

Parameters

baselineAligned	true to align widgets on their baseline, false otherwise

public void setBaselineAlignedChildIndex (int i)

Added in API level 1

Related XML Attributes

android:baselineAlignedChildIndex

Parameters

i	The index of the child that will be used if this layout is part of a larger layout that is baseline aligned.

public void setDividerDrawable (Drawable divider)

Added in API level 11

Set a drawable to be used as a divider between items.

Related XML Attributes

android:divider

Parameters

divider	Drawable that will divide each item.

public void setDividerPadding (int padding)

Added in API level 14

Set padding displayed on both ends of dividers.

Parameters

padding	Padding value in pixels that will be applied to each end

public void setGravity (int gravity)

Added in API level 1

Describes how the child views are positioned. Defaults to GRAVITY_TOP. If this layout has a VERTICAL orientation, this controls where all the child views are placed if there is extra vertical space. If this layout has a HORIZONTAL orientation, this controls the alignment of the children.

Related XML Attributes

android:gravity

Parameters

gravity	See `Gravity`

public void setHorizontalGravity (int horizontalGravity)

Added in API level 1

public void setMeasureWithLargestChildEnabled (boolean enabled)

Added in API level 11

When set to true, all children with a weight will be considered having the minimum size of the largest child. If false, all children are measured normally. Disabled by default.

Related XML Attributes

android:measureWithLargestChild

Parameters

enabled	True to measure children with a weight using the minimum size of the largest child, false otherwise.

public void setOrientation (int orientation)

Added in API level 1

Should the layout be a column or a row.

Related XML Attributes

android:orientation

Parameters

orientation	Pass `HORIZONTAL` or `VERTICAL`. Default value is `HORIZONTAL`.

public void setShowDividers (int showDividers)

Added in API level 11

Set how dividers should be shown between items in this layout

Parameters

showDividers	One or more of `SHOW_DIVIDER_BEGINNING`, `SHOW_DIVIDER_MIDDLE`, or `SHOW_DIVIDER_END`, or `SHOW_DIVIDER_NONE` to show no dividers.

public void setVerticalGravity (int verticalGravity)

Added in API level 1

public void setWeightSum (float weightSum)

Added in API level 1

Defines the desired weights sum. If unspecified the weights sum is computed at layout time by adding the layout_weight of each child. This can be used for instance to give a single child 50% of the total available space by giving it a layout_weight of 0.5 and setting the weightSum to 1.0.

Parameters

weightSum	a number greater than 0.0f, or a number lower than or equals to 0.0f if the weight sum should be computed from the children's layout_weight

public boolean shouldDelayChildPressedState ()

Added in API level 14

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.

Protected Methods

protected boolean checkLayoutParams (ViewGroup.LayoutParams p)

Added in API level 1

protected LinearLayout.LayoutParams generateDefaultLayoutParams ()

Added in API level 1

Returns a set of layout parameters with a width of MATCH_PARENT and a height of WRAP_CONTENT when the layout's orientation is VERTICAL. When the orientation is HORIZONTAL, the width is set to WRAP_CONTENT and the height to WRAP_CONTENT.

Returns

a set of default layout parameters or null

protected LinearLayout.LayoutParams generateLayoutParams (ViewGroup.LayoutParams p)

Added in API level 1

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

protected void onDraw (Canvas canvas)

Added in API level 1

Implement this to do your drawing.

Parameters

canvas	the canvas on which the background will be drawn

protected void onLayout (boolean changed, int l, int t, int r, int b)

Added in API level 1

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.

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

protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)

Added in API level 1

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

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

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

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

Parameters

widthMeasureSpec	horizontal space requirements as imposed by the parent. The requirements are encoded with `View.MeasureSpec`.
heightMeasureSpec	vertical space requirements as imposed by the parent. The requirements are encoded with `View.MeasureSpec`.

Results

Annotations

Interfaces

Classes

Enums

Exceptions

LinearLayout

Class Overview

Summary

XML Attributes

android:baselineAligned

Related Methods

android:baselineAlignedChildIndex

Related Methods

android:divider

Related Methods

android:gravity

Related Methods

android:measureWithLargestChild

Related Methods

android:orientation

Related Methods

android:weightSum

Related Methods

Constants

public static final int HORIZONTAL

public static final int SHOW_DIVIDER_BEGINNING

public static final int SHOW_DIVIDER_END

public static final int SHOW_DIVIDER_MIDDLE

public static final int SHOW_DIVIDER_NONE

public static final int VERTICAL

Public Constructors

public LinearLayout (Context context)

public LinearLayout (Context context, AttributeSet attrs)

public LinearLayout (Context context, AttributeSet attrs, int defStyleAttr)

public LinearLayout (Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)

Public Methods

public LinearLayout.LayoutParams generateLayoutParams (AttributeSet attrs)

Parameters

Returns

public int getBaseline ()

Returns

public int getBaselineAlignedChildIndex ()

Returns

public Drawable getDividerDrawable ()

Related XML Attributes

Returns

See Also

public int getDividerPadding ()

See Also

public int getOrientation ()

Returns

public int getShowDividers ()

Returns

See Also

public float getWeightSum ()

Returns

public boolean isBaselineAligned ()

Returns

public boolean isMeasureWithLargestChildEnabled ()

Related XML Attributes

Returns

public void onInitializeAccessibilityEvent (AccessibilityEvent event)

Parameters

public void onInitializeAccessibilityNodeInfo (AccessibilityNodeInfo info)

Parameters

public void setBaselineAligned (boolean baselineAligned)

Related XML Attributes

Parameters

public void setBaselineAlignedChildIndex (int i)

Related XML Attributes

Parameters

public void setDividerDrawable (Drawable divider)

Related XML Attributes

Parameters

See Also

public void setDividerPadding (int padding)

Parameters

See Also

public void setGravity (int gravity)