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Added in API level 1
Deprecated since API level 16

public class

Gallery

extends AbsSpinner
implements GestureDetector.OnGestureListener

java.lang.Object
↳	android.view.View
	↳	android.view.ViewGroup
		↳	android.widget.AdapterView <T extends android.widget.Adapter >
			↳	android.widget.AbsSpinner
				↳	android.widget.Gallery

This class was deprecated in API level 16.
This widget is no longer supported. Other horizontally scrolling widgets include HorizontalScrollView and ViewPager from the support library.

Class Overview

A view that shows items in a center-locked, horizontally scrolling list.

The default values for the Gallery assume you will be using Theme_galleryItemBackground as the background for each View given to the Gallery from the Adapter. If you are not doing this, you may need to adjust some Gallery properties, such as the spacing.

Views given to the Gallery should use Gallery.LayoutParams as their layout parameters type.

Summary

Nested Classes
class	Gallery.LayoutParams	Gallery extends LayoutParams to provide a place to hold current Transformation information along with previous position/transformation info.

XML Attributes
Attribute Name	Related Method	Description
android:animationDuration	setAnimationDuration(int)	Sets how long a transition animation should run (in milliseconds) when layout has changed.
android:gravity	setGravity(int)	Specifies how an object should position its content, on both the X and Y axes, within its own bounds.
android:spacing	setSpacing(int)
android:unselectedAlpha	setUnselectedAlpha(float)	Sets the alpha on the items that are not selected.

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Inherited XML Attributes

From class android.widget.AbsSpinner

From class android.view.ViewGroup

From class android.view.View

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Inherited Constants

From class android.widget.AdapterView

From class android.view.ViewGroup

From class android.view.View

[Expand]

Inherited Fields

From class android.view.View

Public Constructors
	Gallery ( Context context)
	Gallery ( Context context, AttributeSet attrs)
	Gallery ( Context context, AttributeSet attrs, int defStyle)

Public Methods
boolean	dispatchKeyEvent ( KeyEvent event) Dispatch a key event to the next view on the focus path.
void	dispatchSetSelected (boolean selected) Dispatch setSelected to all of this View's children.
ViewGroup.LayoutParams	generateLayoutParams ( AttributeSet attrs) Returns a new set of layout parameters based on the supplied attributes set.
boolean	onDown ( MotionEvent e) Notified when a tap occurs with the down `MotionEvent` that triggered it.
boolean	onFling ( MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) Notified of a fling event when it occurs with the initial on down `MotionEvent` and the matching up `MotionEvent` .
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) Handles left, right, and clicking
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	onLongPress ( MotionEvent e) Notified when a long press occurs with the initial on down `MotionEvent` that trigged it.
boolean	onScroll ( MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) Notified when a scroll occurs with the initial on down `MotionEvent` and the current move `MotionEvent` .
void	onShowPress ( MotionEvent e) The user has performed a down `MotionEvent` and not performed a move or up yet.
boolean	onSingleTapUp ( MotionEvent e) Notified when a tap occurs with the up `MotionEvent` that triggered it.
boolean	onTouchEvent ( MotionEvent event) Implement this method to handle touch screen motion events.
boolean	performAccessibilityAction (int action, Bundle arguments) Performs the specified accessibility action on the view.
void	setAnimationDuration (int animationDurationMillis) Sets how long the transition animation should run when a child view changes position.
void	setCallbackDuringFling (boolean shouldCallback) Whether or not to callback on any `getOnItemSelectedListener()` while the items are being flinged.
void	setGravity (int gravity) Describes how the child views are aligned.
void	setSpacing (int spacing) Sets the spacing between items in a Gallery
void	setUnselectedAlpha (float unselectedAlpha) Sets the alpha of items that are not selected in the Gallery.
boolean	showContextMenu () Bring up the context menu for this view.
boolean	showContextMenuForChild ( View originalView) Bring up a context menu for the specified view or its ancestors.

Protected Methods
boolean	checkLayoutParams ( ViewGroup.LayoutParams p)
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	dispatchSetPressed (boolean pressed) Dispatch setPressed to all of this View's children.
ViewGroup.LayoutParams	generateDefaultLayoutParams () Returns a set of default layout parameters.
ViewGroup.LayoutParams	generateLayoutParams ( ViewGroup.LayoutParams p) Returns a safe set of layout parameters based on the supplied layout params.
int	getChildDrawingOrder (int childCount, int i) Returns the index of the child to draw for this iteration.
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.
ContextMenu.ContextMenuInfo	getContextMenuInfo () Views should implement this if they have extra information to associate with the context menu.
void	onFocusChanged (boolean gainFocus, int direction, Rect previouslyFocusedRect) Called by the view system when the focus state of this view changes.
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.

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Inherited Methods

From class android.widget.AbsSpinner

From class android.widget.AdapterView

From class android.view.ViewGroup

From class android.view.View

void	)">addChildrenForAccessibility ( ArrayList < View > children) Adds the children of a given View for accessibility.
void	, int, int)">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	, int)">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 horizontal 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	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	, java.lang.CharSequence, int)">findViewsWithText ( ArrayList < View > outViews, CharSequence searched, int flags) Finds the Views that contain given text.
boolean	fitSystemWindows ( Rect insets) This method was deprecated in API level 20. 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` .
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.
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.
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.
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.
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.
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	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	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	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	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 was deprecated in API level 20. 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	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	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	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	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	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	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.
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.
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.
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.GestureDetector.OnGestureListener

From interface android.view.KeyEvent.Callback

abstract boolean	onKeyDown (int keyCode, KeyEvent event) Called when a key down event has occurred.
abstract boolean	onKeyLongPress (int keyCode, KeyEvent event) Called when a long press has occurred.
abstract boolean	onKeyMultiple (int keyCode, int count, KeyEvent event) Called when multiple down/up pairs of the same key have occurred in a row.
abstract boolean	onKeyUp (int keyCode, KeyEvent event) Called when a key up event has occurred.

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 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:animationDuration

Sets how long a transition animation should run (in milliseconds) when layout has changed. Only relevant if animation is turned on.

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 animationDuration .

Related Methods

setAnimationDuration(int)

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:spacing

Related Methods

setSpacing(int)

android:unselectedAlpha

Sets the alpha on the items that are not selected.

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 unselectedAlpha .

Related Methods

setUnselectedAlpha(float)

Public Constructors

public Gallery ( Context context)

Added in API level 1

public Gallery ( Context context, AttributeSet attrs)

Added in API level 1

public Gallery ( Context context, AttributeSet attrs, int defStyle)

Added in API level 1

Public Methods

public boolean dispatchKeyEvent ( KeyEvent event)

Added in API level 1

Dispatch a key event to the next view on the focus path. This path runs from the top of the view tree down to the currently focused view. If this view has focus, it will dispatch to itself. Otherwise it will dispatch the next node down the focus path. This method also fires any key listeners.

Parameters

event	The key event to be dispatched.

Returns

True if the event was handled, false otherwise.

public void dispatchSetSelected (boolean selected)

Added in API level 1

Dispatch setSelected to all of this View's children.

Parameters

selected	The new selected state

public ViewGroup.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 boolean onDown ( MotionEvent e)

Added in API level 1

Notified when a tap occurs with the down MotionEvent that triggered it. This will be triggered immediately for every down event. All other events should be preceded by this.

Parameters

e	The down motion event.

public boolean onFling ( MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)

Added in API level 1

Notified of a fling event when it occurs with the initial on down MotionEvent and the matching up MotionEvent . The calculated velocity is supplied along the x and y axis in pixels per second.

Parameters

e1	The first down motion event that started the fling.
e2	The move motion event that triggered the current onFling.
velocityX	The velocity of this fling measured in pixels per second along the x axis.
velocityY	The velocity of this fling measured in pixels per second along the y axis.

Returns

true if the event is consumed, else false

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 boolean onKeyDown (int keyCode, KeyEvent event)

Added in API level 1

Handles left, right, and clicking

Parameters

keyCode	A key code that represents the button pressed, from `KeyEvent` .
event	The KeyEvent object that defines the button action.

Returns

If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

public boolean onKeyUp (int keyCode, KeyEvent event)

Added in API level 1

Default implementation of KeyEvent.Callback.onKeyUp() : perform clicking of the view when KEYCODE_DPAD_CENTER or KEYCODE_ENTER is released.

Key presses in software keyboards will generally NOT trigger this listener, although some may elect to do so in some situations. Do not rely on this to catch software key presses.

Parameters

keyCode	A key code that represents the button pressed, from `KeyEvent` .
event	The KeyEvent object that defines the button action.

Returns

If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

public void onLongPress ( MotionEvent e)

Added in API level 1

Notified when a long press occurs with the initial on down MotionEvent that trigged it.

Parameters

e	The initial on down motion event that started the longpress.

public boolean onScroll ( MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)

Added in API level 1

Notified when a scroll occurs with the initial on down MotionEvent and the current move MotionEvent . The distance in x and y is also supplied for convenience.

Parameters

e1	The first down motion event that started the scrolling.
e2	The move motion event that triggered the current onScroll.
distanceX	The distance along the X axis that has been scrolled since the last call to onScroll. This is NOT the distance between `e1` and `e2` .
distanceY	The distance along the Y axis that has been scrolled since the last call to onScroll. This is NOT the distance between `e1` and `e2` .

Returns

true if the event is consumed, else false

public void onShowPress ( MotionEvent e)

Added in API level 1

The user has performed a down MotionEvent and not performed a move or up yet. This event is commonly used to provide visual feedback to the user to let them know that their action has been recognized i.e. highlight an element.

Parameters

e	The down motion event

public boolean onSingleTapUp ( MotionEvent e)

Added in API level 1

Notified when a tap occurs with the up MotionEvent that triggered it.

Parameters

e	The up motion event that completed the first tap

Returns

true if the event is consumed, else false

public boolean onTouchEvent ( MotionEvent event)

Added in API level 1

Implement this method to handle touch screen motion events.

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

obeying click sound preferences
dispatching OnClickListener calls
handling ACTION_CLICK when accessibility features are enabled

Parameters

event	The motion event.

Returns

True if the event was handled, false otherwise.

public boolean performAccessibilityAction (int action, Bundle arguments)

Added in API level 16

Performs the specified accessibility action on the view. For possible accessibility actions look at AccessibilityNodeInfo .

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

Parameters

action	The action to perform.
arguments	Optional action arguments.

Returns

Whether the action was performed.

public void setAnimationDuration (int animationDurationMillis)

Added in API level 1

Sets how long the transition animation should run when a child view changes position. Only relevant if animation is turned on.

Related XML Attributes

android:animationDuration

Parameters

animationDurationMillis	The duration of the transition, in milliseconds.

public void setCallbackDuringFling (boolean shouldCallback)

Added in API level 1

Whether or not to callback on any getOnItemSelectedListener() while the items are being flinged. If false, only the final selected item will cause the callback. If true, all items between the first and the final will cause callbacks.

Parameters

shouldCallback	Whether or not to callback on the listener while the items are being flinged.

public void setGravity (int gravity)

Added in API level 1

Describes how the child views are aligned.

Related XML Attributes

android:gravity

public void setSpacing (int spacing)

Added in API level 1

Sets the spacing between items in a Gallery

Related XML Attributes

android:spacing

Parameters

spacing	The spacing in pixels between items in the Gallery

public void setUnselectedAlpha (float unselectedAlpha)

Added in API level 1

Sets the alpha of items that are not selected in the Gallery.

Related XML Attributes

android:unselectedAlpha

Parameters

unselectedAlpha	the alpha for the items that are not selected.

public boolean showContextMenu ()

Added in API level 1

Bring up the context menu for this view.

Returns

Whether a context menu was displayed.

public boolean showContextMenuForChild ( View originalView)

Added in API level 1

Bring up a context menu for the specified view or its ancestors.

In most cases, a subclass does not need to override this. However, if the subclass is added directly to the window manager (for example, addView(View, android.view.ViewGroup.LayoutParams) ) then it should override this and show the context menu.

Parameters

originalView	The source view where the context menu was first invoked

Returns

true if a context menu was displayed

Protected Methods

protected boolean checkLayoutParams ( ViewGroup.LayoutParams p)

Added in API level 1

protected int computeHorizontalScrollExtent ()

Added in API level 1

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

The range is expressed in arbitrary units that must be the same as the units used by computeHorizontalScrollRange() and computeHorizontalScrollOffset() .

The default extent is the drawing width of this view.

Returns

the horizontal extent of the scrollbar's thumb

protected int computeHorizontalScrollOffset ()

Added in API level 1

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

The range is expressed in arbitrary units that must be the same as the units used by computeHorizontalScrollRange() and computeHorizontalScrollExtent() .

The default offset is the scroll offset of this view.

Returns

the horizontal offset of the scrollbar's thumb

protected int computeHorizontalScrollRange ()

Added in API level 1

Compute the horizontal range that the horizontal scrollbar represents.

The range is expressed in arbitrary units that must be the same as the units used by computeHorizontalScrollExtent() and computeHorizontalScrollOffset() .

The default range is the drawing width of this view.

Returns

the total horizontal range represented by the horizontal scrollbar

protected void dispatchSetPressed (boolean pressed)

Added in API level 1

Dispatch setPressed to all of this View's children.

Parameters

pressed	The new pressed state

protected ViewGroup.LayoutParams generateDefaultLayoutParams ()

Added in API level 1

Returns a set of default layout parameters. These parameters are requested when the View passed to addView(View) has no layout parameters already set. If null is returned, an exception is thrown from addView.

Returns

a set of default layout parameters or null

protected ViewGroup.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 int getChildDrawingOrder (int childCount, int i)

Added in API level 1

Returns the index of the child to draw for this iteration. Override this if you want to change the drawing order of children. By default, it returns i.

NOTE: In order for this method to be called, you must enable child ordering first by calling setChildrenDrawingOrderEnabled(boolean) .

Parameters

i	The current iteration.

Returns

The index of the child to draw this iteration.

protected boolean getChildStaticTransformation ( View child, Transformation t)

Added in API level 1

Sets t to be the static transformation of the child, if set, returning a boolean to indicate whether a static transform was set. The default implementation simply returns false ; subclasses may override this method for different behavior. setStaticTransformationsEnabled(boolean) must be set to true for this method to be called.

Parameters

child	The child view whose static transform is being requested
t	The Transformation which will hold the result

Returns

true if the transformation was set, false otherwise

protected ContextMenu.ContextMenuInfo getContextMenuInfo ()

Added in API level 1

Views should implement this if they have extra information to associate with the context menu. The return result is supplied as a parameter to the onCreateContextMenu(ContextMenu, View, ContextMenuInfo) callback.

Returns

Extra information about the item for which the context menu should be shown. This information will vary across different subclasses of View.

protected void onFocusChanged (boolean gainFocus, int direction, Rect previouslyFocusedRect)

Added in API level 1

Called by the view system when the focus state of this view changes. When the focus change event is caused by directional navigation, direction and previouslyFocusedRect provide insight into where the focus is coming from. When overriding, be sure to call up through to the super class so that the standard focus handling will occur.

Parameters

gainFocus	True if the View has focus; false otherwise.
direction	The direction focus has moved when requestFocus() is called to give this view focus. Values are `FOCUS_UP` , `FOCUS_DOWN` , `FOCUS_LEFT` , `FOCUS_RIGHT` , `FOCUS_FORWARD` , or `FOCUS_BACKWARD` . It may not always apply, in which case use the default.
previouslyFocusedRect	The rectangle, in this view's coordinate system, of the previously focused view. If applicable, this will be passed in as finer grained information about where the focus is coming from (in addition to direction). Will be `null` otherwise.

protected void 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

Results

Interfaces

Classes

Enums

Exceptions

Gallery

Class Overview

Summary

XML Attributes

android:animationDuration

Related Methods

android:gravity

Related Methods

android:spacing

Related Methods

android:unselectedAlpha

Related Methods

Public Constructors

public Gallery ( Context context)

public Gallery ( Context context, AttributeSet attrs)

public Gallery ( Context context, AttributeSet attrs, int defStyle)

Public Methods

public boolean dispatchKeyEvent ( KeyEvent event)

Parameters

Returns

public void dispatchSetSelected (boolean selected)

Parameters

public ViewGroup.LayoutParams generateLayoutParams ( AttributeSet attrs)

Parameters

Returns

public boolean onDown ( MotionEvent e)

Parameters

public boolean onFling ( MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)

Parameters

Returns

public void onInitializeAccessibilityEvent ( AccessibilityEvent event)

Parameters

public void onInitializeAccessibilityNodeInfo ( AccessibilityNodeInfo info)

Parameters

public boolean onKeyDown (int keyCode, KeyEvent event)

Parameters

Returns

See Also

public boolean onKeyUp (int keyCode, KeyEvent event)

Parameters

Returns

public void onLongPress ( MotionEvent e)

Parameters

public boolean onScroll ( MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)

Parameters

Returns

public void onShowPress ( MotionEvent e)

Parameters

public boolean onSingleTapUp ( MotionEvent e)

Parameters

Returns

public boolean onTouchEvent ( MotionEvent event)

Parameters

Returns

public boolean performAccessibilityAction (int action, Bundle arguments)

Parameters

Returns

public void setAnimationDuration (int animationDurationMillis)

Related XML Attributes

Parameters

public void setCallbackDuringFling (boolean shouldCallback)

Parameters

public void setGravity (int gravity)

Related XML Attributes

public void setSpacing (int spacing)

Related XML Attributes

Parameters

public void setUnselectedAlpha (float unselectedAlpha)

Related XML Attributes

Parameters

public boolean showContextMenu ()

Returns

public boolean showContextMenuForChild ( View originalView)

Parameters

Returns