# AccessibilityEventSource Added in[API level 4](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) # AccessibilityEventSource *** ** * ** *** Kotlin\|[Java](https://developer.android.com/reference/android/view/accessibility/AccessibilityEventSource "View this page in Java") ``` interface AccessibilityEventSource ``` |------------------------------------------------------------------------------------------------------------------------------------------------------------| | [android.view.accessibility.AccessibilityEventSource](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEventSource#) | |----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | Known Direct Subclasses [View](https://developer.android.com/reference/kotlin/android/view/View.html#) |--------------------------------------------------------------------------------|-------------------------------------------------------------------------------| | [View](https://developer.android.com/reference/kotlin/android/view/View.html#) | This class represents the basic building block for user interface components. | | 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| Known Indirect Subclasses [AbsListView](https://developer.android.com/reference/kotlin/android/widget/AbsListView.html#),[AbsSeekBar](https://developer.android.com/reference/kotlin/android/widget/AbsSeekBar.html#),[AbsSpinner](https://developer.android.com/reference/kotlin/android/widget/AbsSpinner.html#),[AbsoluteLayout](https://developer.android.com/reference/kotlin/android/widget/AbsoluteLayout.html#),[ActionMenuView](https://developer.android.com/reference/kotlin/android/widget/ActionMenuView.html#),[AdapterView](https://developer.android.com/reference/kotlin/android/widget/AdapterView.html#),[AdapterViewAnimator](https://developer.android.com/reference/kotlin/android/widget/AdapterViewAnimator.html#),[AdapterViewFlipper](https://developer.android.com/reference/kotlin/android/widget/AdapterViewFlipper.html#),[AnalogClock](https://developer.android.com/reference/kotlin/android/widget/AnalogClock.html#),[AppWidgetHostView](https://developer.android.com/reference/kotlin/android/appwidget/AppWidgetHostView.html#),[AutoCompleteTextView](https://developer.android.com/reference/kotlin/android/widget/AutoCompleteTextView.html#),[Button](https://developer.android.com/reference/kotlin/android/widget/Button.html#), and 70 others. |--------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [AbsListView](https://developer.android.com/reference/kotlin/android/widget/AbsListView.html#) | Base class that can be used to implement virtualized lists of items. | | [AbsSeekBar](https://developer.android.com/reference/kotlin/android/widget/AbsSeekBar.html#) | AbsSeekBar extends the capabilities of ProgressBar by adding a draggable thumb. | | [AbsSpinner](https://developer.android.com/reference/kotlin/android/widget/AbsSpinner.html#) | An abstract base class for spinner widgets. | | [AbsoluteLayout](https://developer.android.com/reference/kotlin/android/widget/AbsoluteLayout.html#) | A layout that lets you specify exact locations (x/y coordinates) of its children. | | [ActionMenuView](https://developer.android.com/reference/kotlin/android/widget/ActionMenuView.html#) | ActionMenuView is a presentation of a series of menu options as a View. | | [AdapterView](https://developer.android.com/reference/kotlin/android/widget/AdapterView.html#) | An AdapterView is a view whose children are determined by an[Adapter](https://developer.android.com/reference/kotlin/android/widget/Adapter.html#). | | [AdapterViewAnimator](https://developer.android.com/reference/kotlin/android/widget/AdapterViewAnimator.html#) | Base class for a[AdapterView](https://developer.android.com/reference/kotlin/android/widget/AdapterView.html#)that will perform animations when switching between its views. | | [AdapterViewFlipper](https://developer.android.com/reference/kotlin/android/widget/AdapterViewFlipper.html#) | Simple[ViewAnimator](https://developer.android.com/reference/kotlin/android/widget/ViewAnimator.html#)that will animate between two or more views that have been added to it. | | [AnalogClock](https://developer.android.com/reference/kotlin/android/widget/AnalogClock.html#) | This widget displays an analogic clock with two hands for hours and minutes. | | [AppWidgetHostView](https://developer.android.com/reference/kotlin/android/appwidget/AppWidgetHostView.html#) | Provides the glue to show AppWidget views. | | [AutoCompleteTextView](https://developer.android.com/reference/kotlin/android/widget/AutoCompleteTextView.html#) | An editable text view that shows completion suggestions automatically while the user is typing. | | [Button](https://developer.android.com/reference/kotlin/android/widget/Button.html#) | A user interface element the user can tap or click to perform an action. | | [CalendarView](https://developer.android.com/reference/kotlin/android/widget/CalendarView.html#) | This class is a calendar widget for displaying and selecting dates. | | [CheckBox](https://developer.android.com/reference/kotlin/android/widget/CheckBox.html#) | A checkbox is a specific type of two-states button that can be either checked or unchecked. | | [CheckedTextView](https://developer.android.com/reference/kotlin/android/widget/CheckedTextView.html#) | An extension to[TextView](https://developer.android.com/reference/kotlin/android/widget/TextView.html#)that supports the[Checkable](https://developer.android.com/reference/kotlin/android/widget/Checkable.html#)interface and displays. | | [Chronometer](https://developer.android.com/reference/kotlin/android/widget/Chronometer.html#) | Class that implements a simple timer. | | [CompoundButton](https://developer.android.com/reference/kotlin/android/widget/CompoundButton.html#) | A button with two states, checked and unchecked. | | [DatePicker](https://developer.android.com/reference/kotlin/android/widget/DatePicker.html#) | Provides a widget for selecting a date. | | [DialerFilter](https://developer.android.com/reference/kotlin/android/widget/DialerFilter.html#) | This widget is a layout that contains several specifically-named child views that handle keyboard entry interpreted as standard phone dialpad digits. | | [DigitalClock](https://developer.android.com/reference/kotlin/android/widget/DigitalClock.html#) | Like AnalogClock, but digital. | | [EditText](https://developer.android.com/reference/kotlin/android/widget/EditText.html#) | A user interface element for entering and modifying text. | | [ExpandableListView](https://developer.android.com/reference/kotlin/android/widget/ExpandableListView.html#) | A view that shows items in a vertically scrolling two-level list. | | [ExtractEditText](https://developer.android.com/reference/kotlin/android/inputmethodservice/ExtractEditText.html#) | \* Specialization of[EditText](https://developer.android.com/reference/kotlin/android/widget/EditText.html#)for showing and interacting with the extracted text in a full-screen input method. | | [FragmentBreadCrumbs](https://developer.android.com/reference/kotlin/android/app/FragmentBreadCrumbs.html#) | Helper class for showing "bread crumbs" representing the fragment stack in an activity. | | [FrameLayout](https://developer.android.com/reference/kotlin/android/widget/FrameLayout.html#) | FrameLayout is designed to block out an area on the screen to display a single item. | | [GLSurfaceView](https://developer.android.com/reference/kotlin/android/opengl/GLSurfaceView.html#) | An implementation of SurfaceView that uses the dedicated surface for displaying OpenGL rendering. | | [Gallery](https://developer.android.com/reference/kotlin/android/widget/Gallery.html#) | A view that shows items in a center-locked, horizontally scrolling list. | | [GestureOverlayView](https://developer.android.com/reference/kotlin/android/gesture/GestureOverlayView.html#) | A transparent overlay for gesture input that can be placed on top of other widgets or contain other widgets. | | [GridLayout](https://developer.android.com/reference/kotlin/android/widget/GridLayout.html#) | A layout that places its children in a rectangular*grid*. | | [GridView](https://developer.android.com/reference/kotlin/android/widget/GridView.html#) | A view that shows items in two-dimensional scrolling grid. | | [HorizontalScrollView](https://developer.android.com/reference/kotlin/android/widget/HorizontalScrollView.html#) | Layout container for a view hierarchy that can be scrolled by the user, allowing it to be larger than the physical display. | | [ImageButton](https://developer.android.com/reference/kotlin/android/widget/ImageButton.html#) | Displays a button with an image (instead of text) that can be pressed or clicked by the user. | | [ImageSwitcher](https://developer.android.com/reference/kotlin/android/widget/ImageSwitcher.html#) | [ViewSwitcher](https://developer.android.com/reference/kotlin/android/widget/ViewSwitcher.html#)that switches between two ImageViews when a new image is set on it. | | [ImageView](https://developer.android.com/reference/kotlin/android/widget/ImageView.html#) | Displays image resources, for example[android.graphics.Bitmap](https://developer.android.com/reference/kotlin/android/graphics/Bitmap.html#)or[android.graphics.drawable.Drawable](https://developer.android.com/reference/kotlin/android/graphics/drawable/Drawable.html#)resources. | | [InlineContentView](https://developer.android.com/reference/kotlin/android/widget/inline/InlineContentView.html#) | This class represents a view that holds opaque content from another app that you can inline in your UI. | | [KeyboardView](https://developer.android.com/reference/kotlin/android/inputmethodservice/KeyboardView.html#) | A view that renders a virtual[Keyboard](https://developer.android.com/reference/kotlin/android/inputmethodservice/Keyboard.html#). | | [LinearLayout](https://developer.android.com/reference/kotlin/android/widget/LinearLayout.html#) | A layout that arranges other views either horizontally in a single column or vertically in a single row. | | [ListView](https://developer.android.com/reference/kotlin/android/widget/ListView.html#) | Displays a vertically-scrollable collection of views, where each view is positioned immediately below the previous view in the list. | | [MediaController](https://developer.android.com/reference/kotlin/android/widget/MediaController.html#) | A view containing controls for a MediaPlayer. | | [MediaRouteButton](https://developer.android.com/reference/kotlin/android/app/MediaRouteButton.html#) |
| | [MultiAutoCompleteTextView](https://developer.android.com/reference/kotlin/android/widget/MultiAutoCompleteTextView.html#) | An editable text view, extending[AutoCompleteTextView](https://developer.android.com/reference/kotlin/android/widget/AutoCompleteTextView.html#), that can show completion suggestions for the substring of the text where the user is typing instead of necessarily for the entire thing. | | [NumberPicker](https://developer.android.com/reference/kotlin/android/widget/NumberPicker.html#) | A widget that enables the user to select a number from a predefined range. | | [ProgressBar](https://developer.android.com/reference/kotlin/android/widget/ProgressBar.html#) | A user interface element that indicates the progress of an operation. | | [QuickContactBadge](https://developer.android.com/reference/kotlin/android/widget/QuickContactBadge.html#) | Widget used to show an image with the standard QuickContact badge and on-click behavior. | | [RadioButton](https://developer.android.com/reference/kotlin/android/widget/RadioButton.html#) | A radio button is a two-states button that can be either checked or unchecked. | | [RadioGroup](https://developer.android.com/reference/kotlin/android/widget/RadioGroup.html#) | This class is used to create a multiple-exclusion scope for a set of radio buttons. | | [RatingBar](https://developer.android.com/reference/kotlin/android/widget/RatingBar.html#) | A RatingBar is an extension of SeekBar and ProgressBar that shows a rating in stars. | | [RelativeLayout](https://developer.android.com/reference/kotlin/android/widget/RelativeLayout.html#) | A Layout where the positions of the children can be described in relation to each other or to the parent. | | [ScrollView](https://developer.android.com/reference/kotlin/android/widget/ScrollView.html#) | A view group that allows the view hierarchy placed within it to be scrolled. | | [SearchView](https://developer.android.com/reference/kotlin/android/widget/SearchView.html#) | A widget that provides a user interface for the user to enter a search query and submit a request to a search provider. | | [SeekBar](https://developer.android.com/reference/kotlin/android/widget/SeekBar.html#) | A SeekBar is an extension of ProgressBar that adds a draggable thumb. | | [SlidingDrawer](https://developer.android.com/reference/kotlin/android/widget/SlidingDrawer.html#) | SlidingDrawer hides content out of the screen and allows the user to drag a handle to bring the content on screen. | | [Space](https://developer.android.com/reference/kotlin/android/widget/Space.html#) | Space is a lightweight View subclass that may be used to create gaps between components in general purpose layouts. | | [Spinner](https://developer.android.com/reference/kotlin/android/widget/Spinner.html#) | A view that displays one child at a time and lets the user pick among them. | | [SplashScreenView](https://developer.android.com/reference/kotlin/android/window/SplashScreenView.html#) | The view which allows an activity to customize its splash screen exit animation. | | [StackView](https://developer.android.com/reference/kotlin/android/widget/StackView.html#) |
| | [SurfaceView](https://developer.android.com/reference/kotlin/android/view/SurfaceView.html#) | Provides a dedicated drawing surface embedded inside of a view hierarchy. | | [Switch](https://developer.android.com/reference/kotlin/android/widget/Switch.html#) | A Switch is a two-state toggle widget. | | [TabHost](https://developer.android.com/reference/kotlin/android/widget/TabHost.html#) | Container for a tabbed window view. | | [TabWidget](https://developer.android.com/reference/kotlin/android/widget/TabWidget.html#) | Displays a list of tab labels representing each page in the parent's tab collection. | | [TableLayout](https://developer.android.com/reference/kotlin/android/widget/TableLayout.html#) | A layout that arranges its children into rows and columns. | | [TableRow](https://developer.android.com/reference/kotlin/android/widget/TableRow.html#) | A layout that arranges its children horizontally. | | [TextClock](https://developer.android.com/reference/kotlin/android/widget/TextClock.html#) | `TextClock`can display the current date and/or time as a formatted string. | | [TextSwitcher](https://developer.android.com/reference/kotlin/android/widget/TextSwitcher.html#) | Specialized[android.widget.ViewSwitcher](https://developer.android.com/reference/kotlin/android/widget/ViewSwitcher.html#)that contains only children of type[android.widget.TextView](https://developer.android.com/reference/kotlin/android/widget/TextView.html#). | | [TextView](https://developer.android.com/reference/kotlin/android/widget/TextView.html#) | A user interface element that displays text to the user. | | [TextureView](https://developer.android.com/reference/kotlin/android/view/TextureView.html#) | A TextureView can be used to display a content stream, such as that coming from a camera preview, a video, or an OpenGL scene. | | [TimePicker](https://developer.android.com/reference/kotlin/android/widget/TimePicker.html#) | A widget for selecting the time of day, in either 24-hour or AM/PM mode. | | [ToggleButton](https://developer.android.com/reference/kotlin/android/widget/ToggleButton.html#) | Displays checked/unchecked states as a button with a "light" indicator and by default accompanied with the text "ON" or "OFF". | | [Toolbar](https://developer.android.com/reference/kotlin/android/widget/Toolbar.html#) | A standard toolbar for use within application content. | | [TvAdView](https://developer.android.com/reference/kotlin/android/media/tv/ad/TvAdView.html#) | Displays contents of TV advertisement services. | | [TvInteractiveAppView](https://developer.android.com/reference/kotlin/android/media/tv/interactive/TvInteractiveAppView.html#) | Displays contents of interactive TV applications. | | [TvView](https://developer.android.com/reference/kotlin/android/media/tv/TvView.html#) | Displays TV contents. | | [TwoLineListItem](https://developer.android.com/reference/kotlin/android/widget/TwoLineListItem.html#) | A view group with two children, intended for use in ListViews. | | [VideoView](https://developer.android.com/reference/kotlin/android/widget/VideoView.html#) | Displays a video file. | | [ViewAnimator](https://developer.android.com/reference/kotlin/android/widget/ViewAnimator.html#) | Base class for a[FrameLayout](https://developer.android.com/reference/kotlin/android/widget/FrameLayout.html#)container that will perform animations when switching between its views. | | [ViewFlipper](https://developer.android.com/reference/kotlin/android/widget/ViewFlipper.html#) | Simple[ViewAnimator](https://developer.android.com/reference/kotlin/android/widget/ViewAnimator.html#)that will animate between two or more views that have been added to it. | | [ViewGroup](https://developer.android.com/reference/kotlin/android/view/ViewGroup.html#) | A`ViewGroup`is a special view that can contain other views (called children.) The view group is the base class for layouts and views containers. | | [ViewStub](https://developer.android.com/reference/kotlin/android/view/ViewStub.html#) | A ViewStub is an invisible, zero-sized View that can be used to lazily inflate layout resources at runtime. | | [ViewSwitcher](https://developer.android.com/reference/kotlin/android/widget/ViewSwitcher.html#) | [ViewAnimator](https://developer.android.com/reference/kotlin/android/widget/ViewAnimator.html#)that switches between two views, and has a factory from which these views are created. | | [WebView](https://developer.android.com/reference/kotlin/android/webkit/WebView.html#) | A View that displays web pages. | | [ZoomButton](https://developer.android.com/reference/kotlin/android/widget/ZoomButton.html#) | This widget provides a simple utility for turning a continued long-press event into a series of clicks at some set frequency. | | [ZoomControls](https://developer.android.com/reference/kotlin/android/widget/ZoomControls.html#) | The`ZoomControls`class displays a simple set of controls used for zooming and provides callbacks to register for events. | | This interface is implemented by classes source of[AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent)s. | | ### Developer Guides | | For more information about making applications accessible, read the[Accessibility](https://developer.android.com/guide/topics/ui/accessibility/index.html)developer guide.
## Summary | Public methods || |--------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | abstract[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [sendAccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEventSource#sendAccessibilityEvent(kotlin.Int))`(`eventType:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Handles the request for sending an[AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent)given the event type. | | abstract[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [sendAccessibilityEventUnchecked](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEventSource#sendAccessibilityEventUnchecked(android.view.accessibility.AccessibilityEvent))`(`event:` `[AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent)!`)` Handles the request for sending an[AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent). | ## Public methods ### sendAccessibilityEvent Added in[API level 4](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun sendAccessibilityEvent(eventType: Int): Unit ``` Handles the request for sending an[AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent)given the event type. The method must first check if accessibility is on via calling[AccessibilityManager.isEnabled()](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityManager#isEnabled()), obtain an[AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent)from the event pool through calling[AccessibilityEvent.obtain(int)](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent#obtain(kotlin.Int)), populate the event, and send it for dispatch via calling[AccessibilityManager.sendAccessibilityEvent(AccessibilityEvent)](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityManager#sendAccessibilityEvent(android.view.accessibility.AccessibilityEvent)). | Parameters || |-------------|--------------------------------------------------------------------------------------------| | `eventType` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):The event type. | **See Also** - [android.view.accessibility.AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent) - [android.view.accessibility.AccessibilityManager](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityManager) ### sendAccessibilityEventUnchecked Added in[API level 4](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun sendAccessibilityEventUnchecked(event: AccessibilityEvent!): Unit ``` Handles the request for sending an[AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent). The method does not guarantee to check if accessibility is on before sending the event for dispatch. It is responsibility of the caller to do the check via calling[AccessibilityManager.isEnabled()](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityManager#isEnabled()). | Parameters || |---------|--------------------------------------------------------------------------------------------------------------------------------| | `event` | [AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent)!:The event. | **See Also** - [android.view.accessibility.AccessibilityEvent](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityEvent) - [android.view.accessibility.AccessibilityManager](https://developer.android.com/reference/kotlin/android/view/accessibility/AccessibilityManager)