README.md

Background Task POC

This is a simple POC to demonstrate how to use background tasks expo using expo-task-manager and expo-background-fetch to run background tasks in a react native app.

Code example

Find the code in App.js file.

const BACKGROUND_NOTIFICATIONS_TASK = 'BACKGROUND-NOTIFICATIONS-TASK';

TaskManager.defineTask(BACKGROUND_NOTIFICATIONS_TASK, async () => {
    console.log('Start');
    const test = async function () {
        console.log('async func call');
    };
    await test();
    console.log('Is this ever reached');

    return BackgroundFetch.BackgroundFetchResult.NewData;
});

BackgroundFetch.registerTaskAsync(BACKGROUND_NOTIFICATIONS_TASK, {
    minimumInterval: 10, // 15 minutes
    stopOnTerminate: false,
    startOnBoot: true,
}).then();

Issue description

❗ Important it's only reproducible on Physical Android device.

The background task is not running as expected in Android. The code after await just suspends and nothing happened in case of background or terminated application state. The output of the code is:

 LOG  Start
 LOG  async func call

in case of active (foreground) application state and

 LOG  Start
 LOG  async func call
 LOG  Is this ever reached

How to Run

yarn install
npx expo prebuild --clean
yarn run android