# ExploreByTouchHelper added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) belongs to Maven artifact com.android.support:customview:28.0.0-alpha1 Summary:[Constants](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#constants)\|[Ctors](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#pubctors)\|[Methods](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#pubmethods)\|[Protected Methods](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#promethods)\|[Inherited Methods](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#inhmethods)\|[\[Expand All\]](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#) # ExploreByTouchHelper | This package is part of the Android[support library](https://developer.android.com/topic/libraries/support-library)which is no longer maintained. The support library has been superseded by[AndroidX](https://developer.android.com/jetpack/androidx)which is part of[Jetpack](https://developer.android.com/jetpack). We recommend using the AndroidX libraries in all new projects. You should also consider[migrating](https://developer.android.com/jetpack/androidx/migrate)existing projects to AndroidX. To find the AndroidX class that maps to this deprecated class, see the AndroidX support library[class mappings](https://developer.android.com/jetpack/androidx/migrate/class-mappings). ` public abstract class ExploreByTouchHelper ` ` `` extends `[AccessibilityDelegateCompat](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat)` `` ` |---|---|------------------------------------------------| | java.lang.Object ||| | ↳ | [android.support.v4.view.AccessibilityDelegateCompat](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat) || | | ↳ | android.support.v4.widget.ExploreByTouchHelper |
*** ** * ** *** ExploreByTouchHelper is a utility class for implementing accessibility support in custom[View](https://developer.android.com/reference/android/view/View.html)s that represent a collection of View-like logical items. It extends[AccessibilityNodeProviderCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeProviderCompat)and simplifies many aspects of providing information to accessibility services and managing accessibility focus. Clients should override abstract methods on this class and attach it to the host view using[setAccessibilityDelegate(View, AccessibilityDelegateCompat)](https://developer.android.com/reference/android/support/v4/view/ViewCompat#setAccessibilityDelegate(android.view.View, android.support.v4.view.AccessibilityDelegateCompat)):
``` class MyCustomView extends View { private MyVirtualViewHelper mVirtualViewHelper; public MyCustomView(Context context, ...) { ... mVirtualViewHelper = new MyVirtualViewHelper(this); ViewCompat.setAccessibilityDelegate(this, mVirtualViewHelper); } @Override public boolean dispatchHoverEvent(MotionEvent event) { return mHelper.dispatchHoverEvent(this, event) || super.dispatchHoverEvent(event); } @Override public boolean dispatchKeyEvent(KeyEvent event) { return mHelper.dispatchKeyEvent(event) || super.dispatchKeyEvent(event); } @Override public boolean onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); mHelper.onFocusChanged(gainFocus, direction, previouslyFocusedRect); } } mAccessHelper = new MyExploreByTouchHelper(someView); ViewCompat.setAccessibilityDelegate(someView, mAccessHelper); ```
## Summary | ### Constants || |-------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | [HOST_ID](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#HOST_ID) Virtual node identifier value for the host view's node. | | `int` | [INVALID_ID](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#INVALID_ID) Virtual node identifier value for invalid nodes. | | ### Public constructors || |-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---| | ` `[ExploreByTouchHelper](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#ExploreByTouchHelper(android.view.View))`(`[View](https://developer.android.com/reference/android/view/View.html)` host) ` Constructs a new helper that can expose a virtual view hierarchy for the specified host view. | | ### Public methods || |-----------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` final boolean` | ` `[clearKeyboardFocusForVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#clearKeyboardFocusForVirtualView(int))`(int virtualViewId) ` Attempts to clear keyboard focus from a virtual view. | | ` final boolean` | ` `[dispatchHoverEvent](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#dispatchHoverEvent(android.view.MotionEvent))`(`[MotionEvent](https://developer.android.com/reference/android/view/MotionEvent.html)` event) ` Delegates hover events from the host view. | | ` final boolean` | ` `[dispatchKeyEvent](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#dispatchKeyEvent(android.view.KeyEvent))`(`[KeyEvent](https://developer.android.com/reference/android/view/KeyEvent.html)` event) ` Delegates key events from the host view. | | ` final int` | ` `[getAccessibilityFocusedVirtualViewId](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#getAccessibilityFocusedVirtualViewId())`() ` | | ` `[AccessibilityNodeProviderCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeProviderCompat) | ` `[getAccessibilityNodeProvider](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#getAccessibilityNodeProvider(android.view.View))`(`[View](https://developer.android.com/reference/android/view/View.html)` host) ` Gets the provider for managing a virtual view hierarchy rooted at this View and reported to[AccessibilityService](https://developer.android.com/reference/android/accessibilityservice/AccessibilityService.html)s that explore the window content. | | ` int` | ` `[getFocusedVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#getFocusedVirtualView())`() ` *This method was deprecated in API level 24.1.0. Use[getAccessibilityFocusedVirtualViewId()](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#getAccessibilityFocusedVirtualViewId()).* | | ` final int` | ` `[getKeyboardFocusedVirtualViewId](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#getKeyboardFocusedVirtualViewId())`() ` | | ` final void` | ` `[invalidateRoot](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#invalidateRoot())`() ` Notifies the accessibility framework that the properties of the parent view have changed. | | ` final void` | ` `[invalidateVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#invalidateVirtualView(int))`(int virtualViewId) ` Notifies the accessibility framework that the properties of a particular item have changed. | | ` final void` | ` `[invalidateVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#invalidateVirtualView(int, int))`(int virtualViewId, int changeTypes) ` Notifies the accessibility framework that the properties of a particular item have changed. | | ` final void` | ` `[onFocusChanged](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onFocusChanged(boolean, int, android.graphics.Rect))`(boolean gainFocus, int direction, `[Rect](https://developer.android.com/reference/android/graphics/Rect.html)` previouslyFocusedRect) ` Delegates focus changes from the host view. | | ` void` | ` `[onInitializeAccessibilityEvent](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onInitializeAccessibilityEvent(android.view.View, android.view.accessibility.AccessibilityEvent))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, `[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)` event) ` Initializes an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)with information about the the host View which is the event source. | | ` void` | ` `[onInitializeAccessibilityNodeInfo](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onInitializeAccessibilityNodeInfo(android.view.View, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, `[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)` info) ` Initializes an[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)with information about the host view. | | ` final boolean` | ` `[requestKeyboardFocusForVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#requestKeyboardFocusForVirtualView(int))`(int virtualViewId) ` Attempts to give keyboard focus to a virtual view. | | ` final boolean` | ` `[sendEventForVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#sendEventForVirtualView(int, int))`(int virtualViewId, int eventType) ` Populates an event of the specified type with information about an item and attempts to send it up through the view hierarchy. | | ### Protected methods || |---------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` abstract int` | ` `[getVirtualViewAt](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#getVirtualViewAt(float, float))`(float x, float y) ` Provides a mapping between view-relative coordinates and logical items. | | ` abstract void` | ` `[getVisibleVirtualViews](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#getVisibleVirtualViews(java.util.List))`(List virtualViewIds) ` Populates a list with the view's visible items. | | ` abstract boolean` | ` `[onPerformActionForVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPerformActionForVirtualView(int, int, android.os.Bundle))`(int virtualViewId, int action, `[Bundle](https://developer.android.com/reference/android/os/Bundle.html)` arguments) ` Performs the specified accessibility action on the item associated with the virtual view identifier. | | ` void` | ` `[onPopulateEventForHost](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateEventForHost(android.view.accessibility.AccessibilityEvent))`(`[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)` event) ` Populates an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)with information about the host view. | | ` void` | ` `[onPopulateEventForVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateEventForVirtualView(int, android.view.accessibility.AccessibilityEvent))`(int virtualViewId, `[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)` event) ` Populates an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)with information about the specified item. | | ` void` | ` `[onPopulateNodeForHost](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateNodeForHost(android.support.v4.view.accessibility.AccessibilityNodeInfoCompat))`(`[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)` node) ` Populates an[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)with information about the host view. | | ` abstract void` | ` `[onPopulateNodeForVirtualView](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateNodeForVirtualView(int, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat))`(int virtualViewId, `[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)` node) ` Populates an[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)with information about the specified item. | | ` void` | ` `[onVirtualViewKeyboardFocusChanged](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onVirtualViewKeyboardFocusChanged(int, boolean))`(int virtualViewId, boolean hasFocus) ` Called when the focus state of a virtual view changes. | | ### Inherited methods | |-----------------------|---| | [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#)From class` `[android.support.v4.view.AccessibilityDelegateCompat](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat)` ` |-----------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` boolean` | ` `[dispatchPopulateAccessibilityEvent](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#dispatchPopulateAccessibilityEvent(android.view.View, android.view.accessibility.AccessibilityEvent))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, `[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)` event) ` Dispatches an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)to the host[View](https://developer.android.com/reference/android/view/View.html)first and then to its children for adding their text content to the event. | | ` `[AccessibilityNodeProviderCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeProviderCompat) | ` `[getAccessibilityNodeProvider](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#getAccessibilityNodeProvider(android.view.View))`(`[View](https://developer.android.com/reference/android/view/View.html)` host) ` Gets the provider for managing a virtual view hierarchy rooted at this View and reported to[AccessibilityService](https://developer.android.com/reference/android/accessibilityservice/AccessibilityService.html)s that explore the window content. | | ` void` | ` `[onInitializeAccessibilityEvent](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#onInitializeAccessibilityEvent(android.view.View, android.view.accessibility.AccessibilityEvent))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, `[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)` event) ` Initializes an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)with information about the the host View which is the event source. | | ` void` | ` `[onInitializeAccessibilityNodeInfo](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#onInitializeAccessibilityNodeInfo(android.view.View, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, `[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)` info) ` Initializes an[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)with information about the host view. | | ` void` | ` `[onPopulateAccessibilityEvent](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#onPopulateAccessibilityEvent(android.view.View, android.view.accessibility.AccessibilityEvent))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, `[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)` event) ` Gives a chance to the host View to populate the accessibility event with its text content. | | ` boolean` | ` `[onRequestSendAccessibilityEvent](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#onRequestSendAccessibilityEvent(android.view.ViewGroup, android.view.View, android.view.accessibility.AccessibilityEvent))`(`[ViewGroup](https://developer.android.com/reference/android/view/ViewGroup.html)` host, `[View](https://developer.android.com/reference/android/view/View.html)` child, `[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)` event) ` Called when a child of the host View has requested sending an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)and gives an opportunity to the parent (the host) to augment the event. | | ` boolean` | ` `[performAccessibilityAction](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#performAccessibilityAction(android.view.View, int, android.os.Bundle))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, int action, `[Bundle](https://developer.android.com/reference/android/os/Bundle.html)` args) ` Performs the specified accessibility action on the view. | | ` void` | ` `[sendAccessibilityEvent](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#sendAccessibilityEvent(android.view.View, int))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, int eventType) ` Sends an accessibility event of the given type. | | ` void` | ` `[sendAccessibilityEventUnchecked](https://developer.android.com/reference/android/support/v4/view/AccessibilityDelegateCompat#sendAccessibilityEventUnchecked(android.view.View, android.view.accessibility.AccessibilityEvent))`(`[View](https://developer.android.com/reference/android/view/View.html)` host, `[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)` event) ` Sends an accessibility event. | || | [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#)From class` java.lang.Object ` |-------------------|-------------------------------| | ` Object` | ` clone() ` | | ` boolean` | ` equals(Object arg0) ` | | ` void` | ` finalize() ` | | ` final Class` | ` getClass() ` | | ` int` | ` hashCode() ` | | ` final void` | ` notify() ` | | ` final void` | ` notifyAll() ` | | ` String` | ` toString() ` | | ` final void` | ` wait(long arg0, int arg1) ` | | ` final void` | ` wait(long arg0) ` | | ` final void` | ` wait() ` | || ## Constants ### HOST_ID added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int HOST_ID ``` Virtual node identifier value for the host view's node.
Constant Value: -1 (0xffffffff) ### INVALID_ID added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int INVALID_ID ``` Virtual node identifier value for invalid nodes.
Constant Value: -2147483648 (0x80000000) ## Public constructors ### ExploreByTouchHelper added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` ExploreByTouchHelper (View host) ``` Constructs a new helper that can expose a virtual view hierarchy for the specified host view.
| Parameters || |--------|----------------------------------------------------------------------------| | `host` | `View`: view whose virtual view hierarchy is exposed by this helper
| ## Public methods ### clearKeyboardFocusForVirtualView added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` boolean clearKeyboardFocusForVirtualView (int virtualViewId) ``` Attempts to clear keyboard focus from a virtual view.
| Parameters || |-----------------|-------------------------------------------------------------------------------------| | `virtualViewId` | `int`: the identifier of the virtual view from which to clear keyboard focus
| | Returns || |-----------|------------------------------------------------------------------| | `boolean` | whether this virtual view actually cleared keyboard focus
| ### dispatchHoverEvent added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` boolean dispatchHoverEvent (MotionEvent event) ``` Delegates hover events from the host view. Dispatches hover[MotionEvent](https://developer.android.com/reference/android/view/MotionEvent.html)s to the virtual view hierarchy when the Explore by Touch feature is enabled. This method should be called by overriding the host view's[dispatchHoverEvent(MotionEvent)](https://developer.android.com/reference/android/view/View.html#dispatchHoverEvent(android.view.MotionEvent))method: ``` @Override public boolean dispatchHoverEvent(MotionEvent event) { return mHelper.dispatchHoverEvent(this, event) || super.dispatchHoverEvent(event); } ```

| Parameters || |---------|----------------------------------------------------------------------------------| | `event` | `MotionEvent`: The hover event to dispatch to the virtual view hierarchy.
| | Returns || |-----------|---------------------------------------------| | `boolean` | Whether the hover event was handled.
| ### dispatchKeyEvent added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` boolean dispatchKeyEvent (KeyEvent event) ``` Delegates key events from the host view. This method should be called by overriding the host view's[dispatchKeyEvent(KeyEvent)](https://developer.android.com/reference/android/view/View.html#dispatchKeyEvent(android.view.KeyEvent))method: ``` @Override public boolean dispatchKeyEvent(KeyEvent event) { return mHelper.dispatchKeyEvent(event) || super.dispatchKeyEvent(event); } ```

| Parameters || |---------|-------------------| | `event` | `KeyEvent`
| | Returns || |-----------|--------| | `boolean` |
| ### getAccessibilityFocusedVirtualViewId added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int getAccessibilityFocusedVirtualViewId () ```

| Returns || |-------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | the identifier of the virtual view that has accessibility focus or[INVALID_ID](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#INVALID_ID)if no virtual view has accessibility focus
| ### getAccessibilityNodeProvider added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` AccessibilityNodeProviderCompat getAccessibilityNodeProvider (View host) ``` Gets the provider for managing a virtual view hierarchy rooted at this View and reported to[AccessibilityService](https://developer.android.com/reference/android/accessibilityservice/AccessibilityService.html)s that explore the window content. The default implementation behaves as[ViewCompat#getAccessibilityNodeProvider(View)](https://developer.android.com/reference/android/support/v4/view/ViewCompat#getAccessibilityNodeProvider(android.view.View))for the case of no accessibility delegate been set.

| Parameters || |--------|---------------| | `host` | `View`
| | Returns || |--------------------------------------------------------------------------------------------------------------------------------------------------|----------------------| | [AccessibilityNodeProviderCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeProviderCompat) | The provider.
| ### getFocusedVirtualView added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int getFocusedVirtualView () ```
**This method was deprecated in API level 24.1.0.** Use[getAccessibilityFocusedVirtualViewId()](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#getAccessibilityFocusedVirtualViewId()). Returns the virtual view ID for the currently accessibility focused item.
| Returns || |-------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | the identifier of the virtual view that has accessibility focus or[INVALID_ID](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#INVALID_ID)if no virtual view has accessibility focus
| ### getKeyboardFocusedVirtualViewId added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int getKeyboardFocusedVirtualViewId () ```

| Returns || |-------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | the identifier of the virtual view that has keyboard focus or[INVALID_ID](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#INVALID_ID)if no virtual view has keyboard focus
| ### invalidateRoot added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void invalidateRoot () ``` Notifies the accessibility framework that the properties of the parent view have changed. You**must**call this method after adding or removing items from the parent view.
### invalidateVirtualView added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void invalidateVirtualView (int virtualViewId) ``` Notifies the accessibility framework that the properties of a particular item have changed. You**must** call this method after changing any of the properties set in[onPopulateNodeForVirtualView(int, AccessibilityNodeInfoCompat)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateNodeForVirtualView(int, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat)).
| Parameters || |-----------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `virtualViewId` | `int`: the virtual view id to invalidate, or[HOST_ID](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#HOST_ID)to invalidate the root view
| **See also:** - [invalidateVirtualView(int, int)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#invalidateVirtualView(int, int)) ### invalidateVirtualView added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void invalidateVirtualView (int virtualViewId, int changeTypes) ``` Notifies the accessibility framework that the properties of a particular item have changed. You**must** call this method after changing any of the properties set in[onPopulateNodeForVirtualView(int, AccessibilityNodeInfoCompat)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateNodeForVirtualView(int, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat)).
| Parameters || |-----------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `virtualViewId` | `int`: the virtual view id to invalidate, or[HOST_ID](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#HOST_ID)to invalidate the root view
| | `changeTypes` | `int`: the bit mask of change types. May be`0`for the default (undefined) change type or one or more of: - [CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityEventCompat#CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION) - [CONTENT_CHANGE_TYPE_SUBTREE](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityEventCompat#CONTENT_CHANGE_TYPE_SUBTREE) - [CONTENT_CHANGE_TYPE_TEXT](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityEventCompat#CONTENT_CHANGE_TYPE_TEXT) - [CONTENT_CHANGE_TYPE_UNDEFINED](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityEventCompat#CONTENT_CHANGE_TYPE_UNDEFINED)
| ### onFocusChanged added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void onFocusChanged (boolean gainFocus, int direction, Rect previouslyFocusedRect) ``` Delegates focus changes from the host view. This method should be called by overriding the host view's[onFocusChanged(boolean, int, Rect)](https://developer.android.com/reference/android/view/View.html#onFocusChanged(boolean, int, android.graphics.Rect))method: ``` @Override public boolean onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); mHelper.onFocusChanged(gainFocus, direction, previouslyFocusedRect); } ```

| Parameters || |-------------------------|------------------| | `gainFocus` | `boolean`
| | `direction` | `int`
| | `previouslyFocusedRect` | `Rect`
| ### onInitializeAccessibilityEvent added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void onInitializeAccessibilityEvent (View host, AccessibilityEvent event) ``` Initializes an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)with information about the the host View which is the event source. The default implementation behaves as[ViewCompat#onInitalizeAccessibilityEvent(View v, AccessibilityEvent event)](https://developer.android.com/reference/android/support/v4/view/ViewCompat#onInitializeAccessibilityEvent(android.view.View, android.view.accessibility.AccessibilityEvent))for the case of no accessibility delegate been set.

| Parameters || |---------|-------------------------------------------------------| | `host` | `View`: The View hosting the delegate.
| | `event` | `AccessibilityEvent`: The event to initialize.
| ### onInitializeAccessibilityNodeInfo added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void onInitializeAccessibilityNodeInfo (View host, AccessibilityNodeInfoCompat info) ``` Initializes an[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)with information about the host view. The default implementation behaves as[ViewCompat#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfoCompat)](https://developer.android.com/reference/android/support/v4/view/ViewCompat#onInitializeAccessibilityNodeInfo(android.view.View, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat))for the case of no accessibility delegate been set.

| Parameters || |--------|-------------------------------------------------------------------| | `host` | `View`: The View hosting the delegate.
| | `info` | `AccessibilityNodeInfoCompat`: The instance to initialize.
| ### requestKeyboardFocusForVirtualView added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` boolean requestKeyboardFocusForVirtualView (int virtualViewId) ``` Attempts to give keyboard focus to a virtual view.
| Parameters || |-----------------|-----------------------------------------------------------------------------------| | `virtualViewId` | `int`: the identifier of the virtual view on which to place keyboard focus
| | Returns || |-----------|---------------------------------------------------------------| | `boolean` | whether this virtual view actually took keyboard focus
| ### sendEventForVirtualView added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` boolean sendEventForVirtualView (int virtualViewId, int eventType) ``` Populates an event of the specified type with information about an item and attempts to send it up through the view hierarchy. You should call this method after performing a user action that normally fires an accessibility event, such as clicking on an item.
``` public void performItemClick(T item) { ... sendEventForVirtualViewId(item.id, AccessibilityEvent.TYPE_VIEW_CLICKED); } ```

| Parameters || |-----------------|-----------------------------------------------------------------------------| | `virtualViewId` | `int`: the identifier of the virtual view for which to send an event
| | `eventType` | `int`: the type of event to send
| | Returns || |-----------|------------------------------------------------------------------| | `boolean` | `true`if the event was sent successfully,`false`otherwise
| ## Protected methods ### getVirtualViewAt added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` int getVirtualViewAt (float x, float y) ``` Provides a mapping between view-relative coordinates and logical items.
| Parameters || |-----|------------------------------------------------| | `x` | `float`: The view-relative x coordinate
| | `y` | `float`: The view-relative y coordinate
| | Returns || |-------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | virtual view identifier for the logical item under coordinates (x,y) or[HOST_ID](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#HOST_ID)if there is no item at the given coordinates
| ### getVisibleVirtualViews added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void getVisibleVirtualViews (List virtualViewIds) ``` Populates a list with the view's visible items. The ordering of items within`virtualViewIds`specifies order of accessibility focus traversal.
| Parameters || |------------------|--------------------------------------------------------| | `virtualViewIds` | `List`: The list to populate with visible items
| ### onPerformActionForVirtualView added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` boolean onPerformActionForVirtualView (int virtualViewId, int action, Bundle arguments) ``` Performs the specified accessibility action on the item associated with the virtual view identifier. See[performAction(int, Bundle)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#performAction(int, android.os.Bundle))for more information. Implementations**must** handle any actions added manually in[onPopulateNodeForVirtualView(int, AccessibilityNodeInfoCompat)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateNodeForVirtualView(int, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat)). The helper class automatically handles focus management resulting from[ACTION_ACCESSIBILITY_FOCUS](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#ACTION_ACCESSIBILITY_FOCUS)and[ACTION_CLEAR_ACCESSIBILITY_FOCUS](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#ACTION_CLEAR_ACCESSIBILITY_FOCUS)actions.
| Parameters || |-----------------|--------------------------------------------------------------------------------------| | `virtualViewId` | `int`: The virtual view identifier of the item on which to perform the action
| | `action` | `int`: The accessibility action to perform
| | `arguments` | `Bundle`: (Optional) A bundle with additional arguments, or null
| | Returns || |-----------|-----------------------------------------| | `boolean` | true if the action was performed
| ### onPopulateEventForHost added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void onPopulateEventForHost (AccessibilityEvent event) ``` Populates an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)with information about the host view. The default implementation is a no-op.
| Parameters || |---------|-----------------------------------------------------------------------------------------| | `event` | `AccessibilityEvent`: the event to populate with information about the host view
| ### onPopulateEventForVirtualView added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void onPopulateEventForVirtualView (int virtualViewId, AccessibilityEvent event) ``` Populates an[AccessibilityEvent](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html)with information about the specified item. The helper class automatically populates the following fields based on the values set by[onPopulateNodeForVirtualView(int, AccessibilityNodeInfoCompat)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateNodeForVirtualView(int, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat)), but implementations may optionally override them: - event text, see[getText()](https://developer.android.com/reference/android/view/accessibility/AccessibilityRecord.html#getText()) - content description, see[setContentDescription(CharSequence)](https://developer.android.com/reference/android/view/accessibility/AccessibilityRecord.html#setContentDescription(java.lang.CharSequence)) - scrollability, see[setScrollable(boolean)](https://developer.android.com/reference/android/view/accessibility/AccessibilityRecord.html#setScrollable(boolean)) - password state, see[setPassword(boolean)](https://developer.android.com/reference/android/view/accessibility/AccessibilityRecord.html#setPassword(boolean)) - enabled state, see[setEnabled(boolean)](https://developer.android.com/reference/android/view/accessibility/AccessibilityRecord.html#setEnabled(boolean)) - checked state, see[setChecked(boolean)](https://developer.android.com/reference/android/view/accessibility/AccessibilityRecord.html#setChecked(boolean)) The following required fields are automatically populated by the helper class and may not be overridden: - item class name, set to the value used in[onPopulateNodeForVirtualView(int, AccessibilityNodeInfoCompat)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateNodeForVirtualView(int, android.support.v4.view.accessibility.AccessibilityNodeInfoCompat)) - package name, set to the package of the host view's[Context](https://developer.android.com/reference/android/content/Context.html), see[setPackageName(CharSequence)](https://developer.android.com/reference/android/view/accessibility/AccessibilityEvent.html#setPackageName(java.lang.CharSequence)) - event source, set to the host view and virtual view identifier, see[setSource(AccessibilityRecord, View, int)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityRecordCompat#setSource(android.view.accessibility.AccessibilityRecord, android.view.View, int))

| Parameters || |-----------------|--------------------------------------------------------------------------------| | `virtualViewId` | `int`: The virtual view id for the item for which to populate the event
| | `event` | `AccessibilityEvent`: The event to populate
| ### onPopulateNodeForHost added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void onPopulateNodeForHost (AccessibilityNodeInfoCompat node) ``` Populates an[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)with information about the host view. The default implementation is a no-op.
| Parameters || |--------|-------------------------------------------------------------------------------------------------| | `node` | `AccessibilityNodeInfoCompat`: the node to populate with information about the host view
| ### onPopulateNodeForVirtualView added in[version 22.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void onPopulateNodeForVirtualView (int virtualViewId, AccessibilityNodeInfoCompat node) ``` Populates an[AccessibilityNodeInfoCompat](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat)with information about the specified item. Implementations**must**populate the following required fields: - event text, see[setText(CharSequence)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setText(java.lang.CharSequence))or[setContentDescription(CharSequence)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setContentDescription(java.lang.CharSequence)) - bounds in parent coordinates, see[setBoundsInParent(Rect)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setBoundsInParent(android.graphics.Rect)) The helper class automatically populates the following fields with default values, but implementations may optionally override them: - enabled state, set to`true`, see[setEnabled(boolean)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setEnabled(boolean)) - keyboard focusability, set to`true`, see[setFocusable(boolean)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setFocusable(boolean)) - item class name, set to`android.view.View`, see[setClassName(CharSequence)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setClassName(java.lang.CharSequence)) The following required fields are automatically populated by the helper class and may not be overridden: - package name, identical to the package name set by[onPopulateEventForVirtualView(int, AccessibilityEvent)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateEventForVirtualView(int, android.view.accessibility.AccessibilityEvent)), see[setPackageName(CharSequence)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setPackageName(java.lang.CharSequence)) - node source, identical to the event source set in[onPopulateEventForVirtualView(int, AccessibilityEvent)](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper#onPopulateEventForVirtualView(int, android.view.accessibility.AccessibilityEvent)), see[setSource(View, int)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setSource(android.view.View, int)) - parent view, set to the host view, see[setParent(View)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setParent(android.view.View)) - visibility, computed based on parent-relative bounds, see[setVisibleToUser(boolean)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setVisibleToUser(boolean)) - accessibility focus, computed based on internal helper state, see[setAccessibilityFocused(boolean)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setAccessibilityFocused(boolean)) - keyboard focus, computed based on internal helper state, see[setFocused(boolean)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setFocused(boolean)) - bounds in screen coordinates, computed based on host view bounds, see[setBoundsInScreen(Rect)](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#setBoundsInScreen(android.graphics.Rect)) Additionally, the helper class automatically handles keyboard focus and accessibility focus management by adding the appropriate[ACTION_FOCUS](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#ACTION_FOCUS),[ACTION_CLEAR_FOCUS](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#ACTION_CLEAR_FOCUS),[ACTION_ACCESSIBILITY_FOCUS](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#ACTION_ACCESSIBILITY_FOCUS), or[ACTION_CLEAR_ACCESSIBILITY_FOCUS](https://developer.android.com/reference/android/support/v4/view/accessibility/AccessibilityNodeInfoCompat#ACTION_CLEAR_ACCESSIBILITY_FOCUS)actions. Implementations must**never**manually add these actions. The helper class also automatically modifies parent- and screen-relative bounds to reflect the portion of the item visible within its parent.
| Parameters || |-----------------|--------------------------------------------------------------------------------------| | `virtualViewId` | `int`: The virtual view identifier of the item for which to populate the node
| | `node` | `AccessibilityNodeInfoCompat`: The node to populate
| ### onVirtualViewKeyboardFocusChanged added in[version 24.1.0](https://developer.android.com/topic/libraries/support-library/revisions) ``` void onVirtualViewKeyboardFocusChanged (int virtualViewId, boolean hasFocus) ``` Called when the focus state of a virtual view changes.
| Parameters || |-----------------|---------------------------------------------------------------| | `virtualViewId` | `int`: the virtual view identifier
| | `hasFocus` | `boolean`:`true`if the view has focus,`false`otherwise
| - ## Interfaces - [DrawerLayout.DrawerListener](https://developer.android.com/reference/android/support/v4/widget/DrawerLayout.DrawerListener) - [NestedScrollView.OnScrollChangeListener](https://developer.android.com/reference/android/support/v4/widget/NestedScrollView.OnScrollChangeListener) - [SimpleCursorAdapter.CursorToStringConverter](https://developer.android.com/reference/android/support/v4/widget/SimpleCursorAdapter.CursorToStringConverter) - [SimpleCursorAdapter.ViewBinder](https://developer.android.com/reference/android/support/v4/widget/SimpleCursorAdapter.ViewBinder) - [SlidingPaneLayout.PanelSlideListener](https://developer.android.com/reference/android/support/v4/widget/SlidingPaneLayout.PanelSlideListener) - [SwipeRefreshLayout.OnChildScrollUpCallback](https://developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout.OnChildScrollUpCallback) - [SwipeRefreshLayout.OnRefreshListener](https://developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout.OnRefreshListener) - [TintableCompoundButton](https://developer.android.com/reference/android/support/v4/widget/TintableCompoundButton) - ## Classes - [AutoScrollHelper](https://developer.android.com/reference/android/support/v4/widget/AutoScrollHelper) - [CircularProgressDrawable](https://developer.android.com/reference/android/support/v4/widget/CircularProgressDrawable) - [CompoundButtonCompat](https://developer.android.com/reference/android/support/v4/widget/CompoundButtonCompat) - [ContentLoadingProgressBar](https://developer.android.com/reference/android/support/v4/widget/ContentLoadingProgressBar) - [CursorAdapter](https://developer.android.com/reference/android/support/v4/widget/CursorAdapter) - [DrawerLayout](https://developer.android.com/reference/android/support/v4/widget/DrawerLayout) - [DrawerLayout.LayoutParams](https://developer.android.com/reference/android/support/v4/widget/DrawerLayout.LayoutParams) - [DrawerLayout.SavedState](https://developer.android.com/reference/android/support/v4/widget/DrawerLayout.SavedState) - [DrawerLayout.SimpleDrawerListener](https://developer.android.com/reference/android/support/v4/widget/DrawerLayout.SimpleDrawerListener) - [EdgeEffectCompat](https://developer.android.com/reference/android/support/v4/widget/EdgeEffectCompat) - [ExploreByTouchHelper](https://developer.android.com/reference/android/support/v4/widget/ExploreByTouchHelper) - [ImageViewCompat](https://developer.android.com/reference/android/support/v4/widget/ImageViewCompat) - [ListPopupWindowCompat](https://developer.android.com/reference/android/support/v4/widget/ListPopupWindowCompat) - [ListViewAutoScrollHelper](https://developer.android.com/reference/android/support/v4/widget/ListViewAutoScrollHelper) - [ListViewCompat](https://developer.android.com/reference/android/support/v4/widget/ListViewCompat) - [NestedScrollView](https://developer.android.com/reference/android/support/v4/widget/NestedScrollView) - [PopupMenuCompat](https://developer.android.com/reference/android/support/v4/widget/PopupMenuCompat) - [PopupWindowCompat](https://developer.android.com/reference/android/support/v4/widget/PopupWindowCompat) - [ResourceCursorAdapter](https://developer.android.com/reference/android/support/v4/widget/ResourceCursorAdapter) - [ScrollerCompat](https://developer.android.com/reference/android/support/v4/widget/ScrollerCompat) - [SimpleCursorAdapter](https://developer.android.com/reference/android/support/v4/widget/SimpleCursorAdapter) - [SlidingPaneLayout](https://developer.android.com/reference/android/support/v4/widget/SlidingPaneLayout) - [SlidingPaneLayout.LayoutParams](https://developer.android.com/reference/android/support/v4/widget/SlidingPaneLayout.LayoutParams) - [SlidingPaneLayout.SimplePanelSlideListener](https://developer.android.com/reference/android/support/v4/widget/SlidingPaneLayout.SimplePanelSlideListener) - [Space](https://developer.android.com/reference/android/support/v4/widget/Space) - [SwipeRefreshLayout](https://developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout) - [TextViewCompat](https://developer.android.com/reference/android/support/v4/widget/TextViewCompat) - [ViewDragHelper](https://developer.android.com/reference/android/support/v4/widget/ViewDragHelper) - [ViewDragHelper.Callback](https://developer.android.com/reference/android/support/v4/widget/ViewDragHelper.Callback)