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<p>
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.
</p>
<p>
{@link android.view.accessibility.AccessibilityEvent}s are sent by the system when
something notable happens in the user interface. For example, when a
{@link android.widget.Button} is clicked, a {@link android.view.View} is focused, etc.
</p>
<p>
{@link android.view.accessibility.AccessibilityRecord} contains information
about state change of its source {@link android.view.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 {@link android.accessibilityservice.AccessibilityService}s.
Hence, accessibility services can facilitate additional accessibility records
to enhance feedback.
</p>
<p>
{@link android.view.accessibility.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 {@link android.accessibilityservice.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.
</p>
<p>
{@link android.view.accessibility.AccessibilityManager} is a system level service that
serves as an event dispatch for {@link android.view.accessibility.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
{@link android.app.Activity} starts, the focus or selection of a {@link android.view.View}
changes etc. Parties interested in handling accessibility events implement and register an
accessibility service which extends {@link android.accessibilityservice.AccessibilityService}.
</p>
<div class="special reference">
<h3>Developer Guides</h3>
<p>For more information about making applications accessible, read the
<a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a>
developer guide.</p>
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