This is documentation for the next SDK version. For up-to-date documentation, see the latest version (SDK 51).

Expo KeepAwake

A React component that prevents the screen from sleeping when rendered.

Android

iOS

tvOS

Web

expo-keep-awake provides a React hook that prevents the screen from sleeping and a pair of functions to enable this behavior imperatively.

Installation

Terminal

- npx expo install expo-keep-awake

If you are installing this in an existing React Native app (bare workflow), start by installing expo in your project. Then, follow the additional instructions as mentioned by library's README under "Installation in bare React Native projects" section.

Usage

Example: hook

Keep Awake hook

import { useKeepAwake } from 'expo-keep-awake';
import React from 'react';
import { Text, View } from 'react-native';

export default function KeepAwakeExample() {
  useKeepAwake();
  return (
    <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
      <Text>This screen will never sleep!</Text>
    </View>
  );
}

Example: functions

Keep Awake functions

import { activateKeepAwake, deactivateKeepAwake } from 'expo-keep-awake';
import React from 'react';
import { Button, View } from 'react-native';

export default class KeepAwakeExample extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
        <Button onPress={this._activate} title="Activate" />
        <Button onPress={this._deactivate} title="Deactivate" />
      </View>
    );
  }

  _activate = () => {
    activateKeepAwake();
    alert('Activated!');
  };

  _deactivate = () => {
    deactivateKeepAwake();
    alert('Deactivated!');
  };
}

API

import KeepAwake from 'expo-keep-awake';

Constants

Android

iOS

tvOS

Web

`KeepAwake.ExpoKeepAwakeTag`

Type: 'ExpoKeepAwakeDefaultTag'

Default tag, used when no tag has been specified in keep awake method calls.

Hooks

Android

iOS

tvOS

Web

`useKeepAwake(tag, options)`

Name	Type	Description
tag (optional)	`string`	Tag to lock screen sleep prevention. If not provided, an ID unique to the owner component is used.
options (optional)	`KeepAwakeOptions`	Additional options for the keep awake hook.

A React hook to keep the screen awake for as long as the owner component is mounted. The optionally provided tag argument is used when activating and deactivating the keep-awake feature. If unspecified, an ID unique to the owner component is used. See the documentation for activateKeepAwakeAsync below to learn more about the tag argument.

Returns:

void

Methods

Deprecated use activateKeepAwakeAsync instead.

Android

iOS

tvOS

Web

`KeepAwake.activateKeepAwake(tag)`

Name	Type	Description
tag (optional)	`string`	Tag to lock screen sleep prevention. If not provided, the default tag is used. Default: `ExpoKeepAwakeTag`

Prevents the screen from sleeping until deactivateKeepAwake is called with the same tag value.

If the tag argument is specified, the screen will not sleep until you call deactivateKeepAwake with the same tag argument. When using multiple tags for activation you'll have to deactivate each one in order to re-enable screen sleep. If tag is unspecified, the default tag is used.

Web support is limited.

Returns:

Promise<void>

Android

iOS

tvOS

Web

`KeepAwake.activateKeepAwakeAsync(tag)`

Name	Type	Description
tag (optional)	`string`	Tag to lock screen sleep prevention. If not provided, the default tag is used. Default: `ExpoKeepAwakeTag`

Prevents the screen from sleeping until deactivateKeepAwake is called with the same tag value.

Web support is limited.

Returns:

Promise<void>

Android

iOS

tvOS

Web

`KeepAwake.deactivateKeepAwake(tag)`

Name	Type	Description
tag (optional)	`string`	Tag to release the lock on screen sleep prevention. If not provided, the default tag is used. Default: `ExpoKeepAwakeTag`

Releases the lock on screen-sleep prevention associated with the given tag value. If tag is unspecified, it defaults to the same default tag that activateKeepAwake uses.

Returns:

Promise<void>

Android

iOS

tvOS

Web

`KeepAwake.isAvailableAsync()`

Returns:

Promise<boolean>

true on all platforms except unsupported web browsers.

Event Subscriptions

Web

`KeepAwake.addListener(tagOrListener, listener)`

Name	Type
tagOrListener	`string \| KeepAwakeListener`
listener (optional)	`KeepAwakeListener`

Observe changes to the keep awake timer. On web, this changes when navigating away from the active window/tab. No-op on native.

Returns:

EventSubscription

Example

KeepAwake.addListener(({ state }) => {
  // ...
});

Types

Android

iOS

tvOS

Web

`KeepAwakeEvent`

Name	Type	Description
state	`KeepAwakeEventState`	Keep awake state.

Web

`KeepAwakeListener()`

Name	Type
event	`KeepAwakeEvent`

Android

iOS

tvOS

Web

`KeepAwakeOptions`

Name	Type	Description
listener (optional)	`KeepAwakeListener`	Only for: Web A callback that is invoked when the keep-awake state changes.
suppressDeactivateWarnings (optional)	`boolean`	The call will throw an unhandled promise rejection on Android when the original Activity is dead or deactivated. Set the value to `true` for suppressing the uncaught exception.

Enums

Android

iOS

tvOS

Web

`KeepAwakeEventState`

KeepAwakeEventState Values

`RELEASE`

KeepAwakeEventState.RELEASE ＝ "release"