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

Function Component

Class Component

TypeScript

JavaScript

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Reference

Methods

addEventListener()

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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announceForAccessibility()

static announceForAccessibility(announcement: string);

Post a string to be announced by the screen reader.

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announceForAccessibilityWithOptions()

static announceForAccessibilityWithOptions(
  announcement: string,
  options: options: {queue?: boolean},
);

Post a string to be announced by the screen reader with modification options. By default announcements will interrupt any existing speech, but on iOS they can be queued behind existing speech by setting queue to true in the options object.

Parameters:

Name	Type	Description
announcement Required	string	The string to be announced
options Required	object	queue - queue the announcement behind existing speech iOS

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getRecommendedTimeoutMillis()

Android

static getRecommendedTimeoutMillis(originalTimeout: number): Promise<number>;

Gets the timeout in millisecond that the user needs. This value is set in "Time to take action (Accessibility timeout)" of "Accessibility" settings.

Parameters:

Name	Type	Description
originalTimeout Required	number	The timeout to return if "Accessibility timeout" is not set. Specify in milliseconds.

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isAccessibilityServiceEnabled()

Android

static isAccessibilityServiceEnabled(): Promise<boolean>;

Check whether any accessibility service is enabled. This includes TalkBack but also any third-party accessibility app that may be installed. To only check whether TalkBack is enabled, use isScreenReaderEnabled. Returns a promise which resolves to a boolean. The result is true when some accessibility services is enabled and false otherwise.

Note: Please use isScreenReaderEnabled if you only want to check the status of TalkBack.

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isBoldTextEnabled()

iOS

static isBoldTextEnabled(): Promise<boolean>:

Query whether a bold text is currently enabled. Returns a promise which resolves to a boolean. The result is true when bold text is enabled and false otherwise.

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isGrayscaleEnabled()

iOS

static isGrayscaleEnabled(): Promise<boolean>;

Query whether grayscale is currently enabled. Returns a promise which resolves to a boolean. The result is true when grayscale is enabled and false otherwise.

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isInvertColorsEnabled()

iOS

static isInvertColorsEnabled(): Promise<boolean>;

Query whether invert colors is currently enabled. Returns a promise which resolves to a boolean. The result is true when invert colors is enabled and false otherwise.

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isReduceMotionEnabled()

static isReduceMotionEnabled(): Promise<boolean>;

Query whether reduce motion is currently enabled. Returns a promise which resolves to a boolean. The result is true when reduce motion is enabled and false otherwise.

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isReduceTransparencyEnabled()

iOS

static isReduceTransparencyEnabled(): Promise<boolean>;

Query whether reduce transparency is currently enabled. Returns a promise which resolves to a boolean. The result is true when a reduce transparency is enabled and false otherwise.

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isScreenReaderEnabled()

static isScreenReaderEnabled(): Promise<boolean>;

Query whether a screen reader is currently enabled. Returns a promise which resolves to a boolean. The result is true when a screen reader is enabled and false otherwise.

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prefersCrossFadeTransitions()

iOS

static prefersCrossFadeTransitions(): Promise<boolean>;

Query whether reduce motion and prefer cross-fade transitions settings are currently enabled. Returns a promise which resolves to a boolean. The result is true when prefer cross-fade transitions is enabled and false otherwise.

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setAccessibilityFocus()

static setAccessibilityFocus(reactTag: number);

Set accessibility focus to a React component.

On Android, this calls UIManager.sendAccessibilityEvent method with passed reactTag and UIManager.AccessibilityEventTypes.typeViewFocused arguments.

Note: Make sure that any View you want to receive the accessibility focus has accessible={true}.