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AccessibilityDelegateCompat

public class AccessibilityDelegateCompat
extends Object

java.lang.Object
↳	android.support.v4.view.AccessibilityDelegateCompat

Known Direct Subclasses

ExploreByTouchHelper, RecyclerViewAccessibilityDelegate

Helper for accessing View.AccessibilityDelegate introduced after API level 4 in a backwards compatible fashion.

Note: On platform versions prior to API 23, delegate methods on views in the android.widget.* package are called before host methods. This prevents certain properties such as class name from being modified by overriding onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfoCompat), as any changes will be overwritten by the host class.

Starting in API 23, delegate methods are called after host methods, which all properties to be modified without being overwritten by the host class.

Summary

Public constructors
`AccessibilityDelegateCompat()` Creates a new instance.

Public methods
`boolean`	`dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event)` Dispatches an `AccessibilityEvent` to the host `View` first and then to its children for adding their text content to the event.
`AccessibilityNodeProviderCompat`	`getAccessibilityNodeProvider(View host)` Gets the provider for managing a virtual view hierarchy rooted at this View and reported to `AccessibilityService`s that explore the window content.
`void`	`onInitializeAccessibilityEvent(View host, AccessibilityEvent event)` Initializes an `AccessibilityEvent` with information about the the host View which is the event source.
`void`	`onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info)` Initializes an `AccessibilityNodeInfoCompat` with information about the host view.
`void`	`onPopulateAccessibilityEvent(View host, AccessibilityEvent event)` Gives a chance to the host View to populate the accessibility event with its text content.
`boolean`	`onRequestSendAccessibilityEvent(ViewGroup host, View child, AccessibilityEvent event)` Called when a child of the host View has requested sending an `AccessibilityEvent` and gives an opportunity to the parent (the host) to augment the event.
`boolean`	`performAccessibilityAction(View host, int action, Bundle args)` Performs the specified accessibility action on the view.
`void`	`sendAccessibilityEvent(View host, int eventType)` Sends an accessibility event of the given type.
`void`	`sendAccessibilityEventUnchecked(View host, AccessibilityEvent event)` Sends an accessibility event.

Inherited methods

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public constructors

AccessibilityDelegateCompat

AccessibilityDelegateCompat ()

Creates a new instance.

Public methods

dispatchPopulateAccessibilityEvent

boolean dispatchPopulateAccessibilityEvent (View host, 
                AccessibilityEvent event)

Dispatches an AccessibilityEvent to the host View first and then to its children for adding their text content to the event.

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

Parameters
`host`	`View`: The View hosting the delegate.
`event`	`AccessibilityEvent`: The event.

Returns
`boolean`	True if the event population was completed.

See also:

View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)

getAccessibilityNodeProvider

AccessibilityNodeProviderCompat getAccessibilityNodeProvider (View host)

Gets the provider for managing a virtual view hierarchy rooted at this View and reported to AccessibilityServices that explore the window content.

The default implementation behaves as ViewCompat#getAccessibilityNodeProvider(View) for the case of no accessibility delegate been set.

Parameters
`host`	`View`

Returns
`AccessibilityNodeProviderCompat`	The provider.

See also:

AccessibilityNodeProviderCompat

onInitializeAccessibilityEvent

void onInitializeAccessibilityEvent (View host, 
                AccessibilityEvent event)

Initializes an AccessibilityEvent with information about the the host View which is the event source.

The default implementation behaves as ViewCompat#onInitalizeAccessibilityEvent(View v, AccessibilityEvent event) for the case of no accessibility delegate been set.

Parameters
`host`	`View`: The View hosting the delegate.
`event`	`AccessibilityEvent`: The event to initialize.

See also:

ViewCompat#onInitializeAccessibilityEvent(View, AccessibilityEvent)

onInitializeAccessibilityNodeInfo

void onInitializeAccessibilityNodeInfo (View host, 
                AccessibilityNodeInfoCompat info)

Initializes an AccessibilityNodeInfoCompat with information about the host view.

The default implementation behaves as ViewCompat#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfoCompat) for the case of no accessibility delegate been set.

Parameters
`host`	`View`: The View hosting the delegate.
`info`	`AccessibilityNodeInfoCompat`: The instance to initialize.

See also:

ViewCompat#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfoCompat)

onPopulateAccessibilityEvent

void onPopulateAccessibilityEvent (View host, 
                AccessibilityEvent event)

Gives a chance to the host View to populate the accessibility event with its text content.

The default implementation behaves as ViewCompat#onPopulateAccessibilityEvent(AccessibilityEvent) for the case of no accessibility delegate been set.

Parameters
`host`	`View`: The View hosting the delegate.
`event`	`AccessibilityEvent`: The accessibility event which to populate.

See also:

ViewCompat#onPopulateAccessibilityEvent(View, AccessibilityEvent)

onRequestSendAccessibilityEvent

boolean onRequestSendAccessibilityEvent (ViewGroup host, 
                View child, 
                AccessibilityEvent event)

Called when a child of the host View has requested sending an AccessibilityEvent and gives an opportunity to the parent (the host) to augment the event.

The default implementation behaves as ViewGroupCompat#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent) for the case of no accessibility delegate been set.

Parameters
`host`	`ViewGroup`: The View hosting the delegate.
`child`	`View`: The child which requests sending the event.
`event`	`AccessibilityEvent`: The event to be sent.

Returns
`boolean`	True if the event should be sent

See also:

ViewGroupCompat#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)

performAccessibilityAction

boolean performAccessibilityAction (View host, 
                int action, 
                Bundle args)

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

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

Parameters
`host`	`View`
`action`	`int`: The action to perform.
`args`	`Bundle`

Returns
`boolean`	Whether the action was performed.

See also:

View#performAccessibilityAction(int, Bundle)

sendAccessibilityEvent

void sendAccessibilityEvent (View host, 
                int eventType)

Sends an accessibility event of the given type. If accessibility is not enabled this method has no effect.

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

Parameters
`host`	`View`: The View hosting the delegate.
`eventType`	`int`: The type of the event to send.

See also:

View#sendAccessibilityEvent(int)

sendAccessibilityEventUnchecked

void sendAccessibilityEventUnchecked (View host, 
                AccessibilityEvent event)

Sends an accessibility event. This method behaves exactly as sendAccessibilityEvent(View, int) but takes as an argument an empty AccessibilityEvent and does not perform a check whether accessibility is enabled.

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

Parameters
`host`	`View`: The View hosting the delegate.
`event`	`AccessibilityEvent`: The event to send.

See also:

View#sendAccessibilityEventUnchecked(AccessibilityEvent)

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AccessibilityDelegateCompat

Summary

Public constructors

Public methods

Inherited methods

Public constructors

AccessibilityDelegateCompat

Public methods

dispatchPopulateAccessibilityEvent

getAccessibilityNodeProvider

onInitializeAccessibilityEvent

onInitializeAccessibilityNodeInfo

onPopulateAccessibilityEvent

onRequestSendAccessibilityEvent

performAccessibilityAction

sendAccessibilityEvent

sendAccessibilityEventUnchecked