> [!WARNING]
> This library is in early development stage; breaking changes can be introduced in minor version upgrades.

expo-live-activity

expo-live-activity is a React Native module designed for use with Expo to manage and display Live Activities on iOS devices exclusively. This module leverages the Live Activities feature introduced in iOS 16, allowing developers to deliver timely updates right on the lock screen.

Features

- Start, update, and stop Live Activities directly from your React Native application.
- Easy integration with a comprehensive API.
- Custom image support within Live Activities with a pre-configured path.
- Listen and handle changes in push notification tokens associated with a Live Activity.

Platform compatibility

Note: This module is intended for use on iOS devices only. The minimal iOS version that supports Live Activities is 16.2. When methods are invoked on platforms other than iOS or on older iOS versions, they will log an error, ensuring that they are used in the correct context.

Installation

> [!NOTE]
> The library isn't supported in Expo Go; to set it up correctly you need to use Expo DevClient .
> To begin using expo-live-activity, follow the installation and configuration steps outlined below:

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Run the following command to add the expo-live-activity module to your project:

``sh npm install expo-live-activity`

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The module comes with a built-in config plugin that creates a target in iOS with all the necessary files. The images used in Live Activities should be added to a pre-defined folder in your assets directory:

1. Add the config plugin to your app.json or app.config.js:`json { "expo": { "plugins": ["expo-live-activity"] } }`If you want to update Live Acitivity with push notifications you can add option"enablePushNotifications": true:`json { "expo": { "plugins": [ [ "expo-live-activity", { "enablePushNotifications": true } ] ] } }`2. Assets configuration: Place images intended for Live Activities in theassets/liveActivity folder. The plugin manages these assets automatically.

Then prebuild your app with:

`sh npx expo prebuild --clean`

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Import the functionalities provided by the expo-live-activity module in your JavaScript or TypeScript files:

`javascript import * as LiveActivity from 'expo-live-activity'`

`API`

expo-live-activity module exports three primary functions to manage Live Activities:

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- startActivity(state: LiveActivityState, config?: LiveActivityConfig): string | undefined: Start a new Live Activity. Takes astate configuration object for initial activity state and an optional config object to customize appearance or behavior. It returns the ID of the created Live Activity, which should be stored for future reference. If the Live Activity can't be created (eg. on android or iOS lower than 16.2), it will return undefined.

- updateActivity(id: string, state: LiveActivityState): Update an existing Live Activity. Thestate object should contain updated information. The activityId indicates which activity should be updated.

- stopActivity(id: string, state: LiveActivityState): Terminate an ongoing Live Activity. Thestate object should contain the final state of the activity. The activityId indicates which activity should be stopped.

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- addActivityPushToStartTokenListener(listener: (event: ActivityPushToStartTokenReceivedEvent) => void): EventSubscription | undefined: Subscribe to changes in the push to start token for starting live acitivities with push notifications. -addActivityTokenListener(listener: (event: ActivityTokenReceivedEvent) => void): EventSubscription | undefined: Subscribe to changes in the push notification token associated with Live Activities.

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When starting a new Live Activity, it's possible to pass deepLinkUrl field in config object. This usually should be a path to one of your screens. If you are using @react-navigation in your project, it's easiest to enable auto linking:

`typescript const prefix = Linking.createURL('')

export default function App() { const url = Linking.useLinkingURL() const linking = { enabled: 'auto' as const, prefixes: [prefix], } }

// Then start the activity with: LiveActivity.startActivity(state, { deepLinkUrl: '/order', })`

URL scheme will be taken automatically from scheme field in app.json or fall back to ios.bundleIdentifier.

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The state object should include:

`typescript { title: string; subtitle?: string; progressBar: { // Only one property, either date or progress, is available at a time as they share a single progress bar component date?: number; // Set as epoch time in milliseconds. This is used as an end date in a timer. progress?: number; //Set amount of progress in the progress bar }; imageName?: string; // Matches the name of the image in 'assets/liveActivity' dynamicIslandImageName?: string; // Matches the name of the image in 'assets/liveActivity' };`

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The config object should include:

`typescript { backgroundColor?: string; titleColor?: string; subtitleColor?: string; progressViewTint?: string; progressViewLabelColor?: string; deepLinkUrl?: string; timerType?: DynamicIslandTimerType; // "circular" | "digital" - defines timer appearance on the dynamic island padding?: Padding // number | {top?: number bottom?: number ...} imagePosition?: ImagePosition; // 'left' | 'right'; imageSize?: ImageSize // 'default' | number (points maxHeight) };`

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LiveActivity.addActivityUpdatesListener API allows to subscribe to changes in Live Activity state. This is useful for example when you want to update the Live Activity with new information. Handler will receive an ActivityUpdateEvent object which contains information about new state under activityState property which is of ActivityState type, so the possible values are: 'active', 'dismissed', 'pending', 'stale' or 'ended'. Apart from this property, the event also contains activityId and activityName which can be used to identify the Live Activity.

`Example Usage`

Managing a Live Activity:

`typescript const state: LiveActivity.LiveActivityState = { title: 'Title', subtitle: 'This is a subtitle', progressBar: { date: new Date(Date.now() + 60 1000 5).getTime(), }, imageName: 'live_activity_image', dynamicIslandImageName: 'dynamic_island_image', }

const config: LiveActivity.LiveActivityConfig = { backgroundColor: '#FFFFFF', titleColor: '#000000', subtitleColor: '#333333', progressViewTint: '#4CAF50', progressViewLabelColor: '#FFFFFF', deepLinkUrl: '/dashboard', timerType: 'circular', padding: { horizontal: 20, top: 16, bottom: 16 }, imagePosition: 'right', imageSize: 'default', // or a number e.g. 80 for custom image height }

const activityId = LiveActivity.startActivity(state, config) // Store activityId for future reference`

This will initiate a Live Activity with the specified title, subtitle, image from your configured assets folder and a time to which there will be a countdown in a progress view.

Subscribing to push token changes:

`typescript useEffect(() => { const updateTokenSubscription = LiveActivity.addActivityTokenListener( ({ activityID: newActivityID, activityName: newName, activityPushToken: newToken }) => { // Send token to a remote server to update Live Activity with push notifications } ) const startTokenSubscription = LiveActivity.addActivityPushToStartTokenListener( ({ activityPushToStartToken: newActivityPushToStartToken }) => { // Send token to a remote server to start Live Activity with push notifications } )

return () => { updateTokenSubscription?.remove() startTokenSubscription?.remove() } }, [])`

> [!NOTE] > Receiving push token may not work on simulators. Make sure to use physical device when testing this functionality.

`Push notifications`

By default, starting and updating Live Activity is possible only via API. If you want to have possibility to start or update Live Activity using push notifications, you can enable that feature by adding "enablePushNotifications": true in the plugin config in your app.json or app.config.ts file.

> [!NOTE] > PushToStart works only for iOS 17.2 and higher.

Example payload for starting Live Activity:

`json { "aps": { "event": "start", "content-state": { "title": "Live Activity title!", "subtitle": "Live Activity subtitle.", "timerEndDateInMilliseconds": 1754410997000, "progress": 0.5, "imageName": "live_activity_image", "dynamicIslandImageName": "dynamic_island_image" }, "timestamp": 1754491435000, // timestamp of when the push notification was sent "attributes-type": "LiveActivityAttributes", "attributes": { "name": "Test", "backgroundColor": "001A72", "titleColor": "EBEBF0", "subtitleColor": "FFFFFF75", "progressViewTint": "38ACDD", "progressViewLabelColor": "FFFFFF", "deepLinkUrl": "/dashboard", "timerType": "digital", "padding": 24, // or use object to control each side: { "horizontal": 20, "top": 16, "bottom": 16 } "imagePosition": "right", "imageSize": "default" }, "alert": { "title": "", "body": "", "sound": "default" } } }`

Example payload for updating Live Activity:

`json { "aps": { "event": "update", "content-state": { "title": "Hello", "subtitle": "World", "timerEndDateInMilliseconds": 1754064245000, "imageName": "live_activity_image", "dynamicIslandImageName": "dynamic_island_image" }, "timestamp": 1754063621319 // timestamp of when the push notification was sent } }`

Where timerEndDateInMilliseconds value is a timestamp in milliseconds corresponding to the target point of the counter displayed in Live Activity view.

`Image support`

Live Activity view also supports image display. There are two dedicated fields in the state object for that:

- imageName-dynamicIslandImageName`

The value of each field can be:

- a string which maps to an asset name
- a URL to remote image - currently, it's possible to use this option only via API, but we plan on to add that feature to push notifications as well. It also requires adding "App Groups" capability to both "main app" and "Live Activity" targets.