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Android APIs
Added in API level 4
package

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.

AccessibilityEvent s 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 AccessibilityService s. 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 AccessibilityEvent s, 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 .

Developer Guides

For more information about making applications accessible, read the Accessibility developer guide.

Interfaces

AccessibilityEventSource This interface is implemented by classes source of AccessibilityEvent s. 
AccessibilityManager.AccessibilityStateChangeListener Listener for the system accessibility 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 AccessibilityEvent s, 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.CollectionInfo Class with information if a node is a collection. 
AccessibilityNodeInfo.CollectionItemInfo Class with information if a node is a collection item. 
AccessibilityNodeInfo.RangeInfo Class with information if a node is a range. 
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 . 
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.