AccessibilityInfo

Sometimes it's useful to know whether or not the device has a screen reader that is currently active. The AccessibilityInfo API is designed for this purpose. You can use it to query the current state of the screen reader as well as to register to be notified when the state of the screen reader changes.

Example

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Reference

Methods

addEventListener()

React TSX

static addEventListener(
  eventName: AccessibilityChangeEventName | AccessibilityAnnouncementEventName,
  handler: (
    event: AccessibilityChangeEvent | AccessibilityAnnouncementFinishedEvent,
  ) => void,
): EmitterSubscription;

Add an event handler. Supported events:

Event name	Description
accessibilityServiceChanged Android	Fires when some services such as TalkBack, other Android assistive technologies, and third-party accessibility services are enabled. The argument to the event handler is a boolean. The boolean is true when a some accessibility services is enabled and false otherwise.
announcementFinished iOS	Fires when the screen reader has finished making an announcement. The argument to the event handler is a dictionary with these keys: announcement: The string announced by the screen reader. success: A boolean indicating whether the announcement was successfully made.
boldTextChanged iOS	Fires when the state of the bold text toggle changes. The argument to the event handler is a boolean. The boolean is true when bold text is enabled and false otherwise.
grayscaleChanged iOS	Fires when the state of the gray scale toggle changes. The argument to the event handler is a boolean. The boolean is true when a gray scale is enabled and false otherwise.
invertColorsChanged iOS	Fires when the state of the invert colors toggle changes. The argument to the event handler is a boolean. The boolean is true when invert colors is enabled and false otherwise.
reduceMotionChanged	Fires when the state of the reduce motion toggle changes. The argument to the event handler is a boolean. The boolean is true when a reduce motion is enabled (or when "Transition Animation Scale" in "Developer options" is "Animation off") and false otherwise.
reduceTransparencyChanged iOS	Fires when the state of the reduce transparency toggle changes. The argument to the event handler is a boolean. The boolean is true when reduce transparency is enabled and false otherwise.
screenReaderChanged	Fires when the state of the screen reader changes. The argument to the event handler is a boolean. The boolean is true when a screen reader is enabled and false otherwise.

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