android.view.accessibility

---

The classes in this package are used to represent screen content and changes to it as well as APIs for querying the global accessibility state of the system.

AccessibilityEvents are sent by the system when something notable happens in the user interface. For example, when a Button is clicked, a View is focused, etc.

AccessibilityRecord contains information about state change of its source View. When a view fires an accessibility event it requests from its parent to dispatch the constructed event. The parent may optionally append a record for itself for providing more context to AccessibilityServices. Hence, accessibility services can facilitate additional accessibility records to enhance feedback.

AccessibilityNodeInfo represents a node of the window content as well as actions that can be requested from its source. From the point of view of an AccessibilityService a window content is presented as tree of accessibility node info which may or may not map one-to-one to the view hierarchy. In other words, a custom view is free to report itself as a tree of accessibility node info.

AccessibilityManager is a system level service that serves as an event dispatch for AccessibilityEvents, and provides facilities for querying the accessibility state of the system. Accessibility events are generated when something notable happens in the user interface, for example an Activity starts, the focus or selection of a View changes etc. Parties interested in handling accessibility events implement and register an accessibility service which extends AccessibilityService.

Interfaces

AccessibilityEventSource	This interface is implemented by classes source of AccessibilityEvents.
AccessibilityManager.AccessibilityServicesStateChangeListener	Listener for changes to the state of accessibility services.
AccessibilityManager.AccessibilityStateChangeListener	Listener for the system accessibility state.
AccessibilityManager.AudioDescriptionRequestedChangeListener	Listener for the audio description by default state.
AccessibilityManager.HighContrastTextStateChangeListener	Listener for the system high contrast text state.
AccessibilityManager.TouchExplorationStateChangeListener	Listener for the system touch exploration state.

Classes

AccessibilityEvent	This class represents accessibility events that are sent by the system when something notable happens in the user interface.
AccessibilityManager	System level service that serves as an event dispatch for AccessibilityEvents, and provides facilities for querying the accessibility state of the system.
AccessibilityNodeInfo	This class represents a node of the window content as well as actions that can be requested from its source.
AccessibilityNodeInfo.AccessibilityAction	A class defining an action that can be performed on an AccessibilityNodeInfo.
AccessibilityNodeInfo.CollectionInfo	Class with information if a node is a collection.
AccessibilityNodeInfo.CollectionInfo.Builder	The builder for CollectionInfo.
AccessibilityNodeInfo.CollectionItemInfo	Class with information if a node is a collection item.
AccessibilityNodeInfo.CollectionItemInfo.Builder	Builder for creating CollectionItemInfo objects.
AccessibilityNodeInfo.ExtraRenderingInfo	Class with information of a view useful to evaluate accessibility needs.
AccessibilityNodeInfo.RangeInfo	Class with information if a node is a range.
AccessibilityNodeInfo.Selection	Represents a selection of content that may extend across more than one AccessibilityNodeInfo instance.
AccessibilityNodeInfo.SelectionPosition	A class which defines either the start or end of a selection that can span across multiple AccessibilityNodeInfo objects.
AccessibilityNodeInfo.TouchDelegateInfo	Class with information of touch delegated views and regions from TouchDelegate for the AccessibilityNodeInfo.
AccessibilityNodeProvider	This class is the contract a client should implement to enable support of a virtual view hierarchy rooted at a given view for accessibility purposes.
AccessibilityRecord	Represents a record in an AccessibilityEvent and contains information about state change of its source View.
AccessibilityRequestPreparer	Object responsible to ensuring that a View is prepared to meet a synchronous request for accessibility data.
AccessibilityWindowInfo	This class represents a state snapshot of a window for accessibility purposes.
CaptioningManager	Contains methods for accessing and monitoring preferred video captioning state and visual properties.
CaptioningManager.CaptioningChangeListener	Listener for changes in captioning properties, including enabled state and user style preferences.
CaptioningManager.CaptionStyle	Specifies visual properties for video captions, including foreground and background colors, edge properties, and typeface.