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The classes in this package are used for development of accessibility service that
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provide alternative or augmented feedback to the user.
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An {@link android.accessibilityservice.AccessibilityService} runs in the background and
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receives callbacks by the system when {@link android.view.accessibility.AccessibilityEvent}s
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are fired. Such events denote some state transition in the user interface, for example, the
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focus has changed, a button has been clicked, etc. Such a service can optionally request the
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capability for querying the content of the active window. Development of an accessibility
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service requires extends this class and implements its abstract methods.
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An {@link android.accessibilityservice.AccessibilityServiceInfo} describes an
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{@link android.accessibilityservice.AccessibilityService}. The system notifies an
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AccessibilityService for {@link android.view.accessibility.AccessibilityEvent}s
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according to the information encapsulated in this class.
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