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Expo KeepAwake iconExpo KeepAwake

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

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

Platform Compatibility

Android DeviceAndroid EmulatoriOS DeviceiOS SimulatorWeb

Installation

Terminal
- npx expo install expo-keep-awake

If you are installing this in an existing React Native app, start by installing expo in your project. Then, follow the additional instructions as mentioned by the 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

KeepAwake.ExpoKeepAwakeTag

Type: 'ExpoKeepAwakeDefaultTag'


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

Hooks

useKeepAwake(tag, options)

ParameterTypeDescription
tag
(optional)		string

Tag to lock screen sleep prevention. If not provided, the default tag is used.

Default:ExpoKeepAwakeTag
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, the default tag is used. See the documentation for activateKeepAwakeAsync below to learn more about the tag argument.

Returns:

void

Methods

Deprecated use activateKeepAwakeAsync instead.

KeepAwake.activateKeepAwake(tag)

ParameterTypeDescription
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>

KeepAwake.activateKeepAwakeAsync(tag)

ParameterTypeDescription
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>

KeepAwake.deactivateKeepAwake(tag)

ParameterTypeDescription
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>

KeepAwake.isAvailableAsync()

Returns:

Promise<boolean>

true on all platforms except unsupported web browsers.

Event Subscriptions

Only for: 
Web

KeepAwake.addListener(tagOrListener, listener)

ParameterType
tagOrListenerstring | 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:

Subscription

Example

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

Types

KeepAwakeEvent

NameTypeDescription
stateKeepAwakeEventState

Keep awake state.

KeepAwakeListener()

ParameterType
eventKeepAwakeEvent
Returns:

void

KeepAwakeOptions

NameTypeDescription
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

KeepAwakeEventState

KeepAwakeEventState Values

RELEASE

KeepAwakeEventState.RELEASE ＝ "release"