Background Fetch not working after app is terminated.

App.js

export default class App extends Component {
  componentDidMount() {

    BackgroundFetch.configure({
      minimumFetchInterval: 15,     // <-- minutes (15 is minimum allowed)
      stopOnTerminate: false,
      enableHeadless: true,
      startOnBoot: true,
      requiredNetworkType: BackgroundFetch.NETWORK_TYPE_NONE, // Default
      requiresCharging: false,      // Default
      requiresDeviceIdle: false,    // Default
      requiresBatteryNotLow: false, // Default
      requiresStorageNotLow: false  // Default
    }, () => {
      console.log("[js] Received background-fetch event");


      BackgroundFetch.finish(BackgroundFetch.FETCH_RESULT_NEW_DATA);
    }, (error) => {
      console.log("[js] RNBackgroundFetch failed to start");
    });

    BackgroundFetch.status((status) => {
      switch(status) {
        case BackgroundFetch.STATUS_RESTRICTED:
          console.log("BackgroundFetch restricted");
          break;
        case BackgroundFetch.STATUS_DENIED:
          console.log("BackgroundFetch denied");
          break;
        case BackgroundFetch.STATUS_AVAILABLE:
          console.log("BackgroundFetch is enabled");
          break;
      }
    });
  }

  render() {
    return null
  }
};

index.js

import { AppRegistry } from 'react-native';
import App from './App';
import { name as appName } from './app.json';
import BackgroundFetch from "react-native-background-fetch";

let MyHeadlessTask = async () => {
  console.log('[BackgroundFetch HeadlessTask] start');

  
  let response = await fetch('https://facebook.github.io/react-native/movies.json%27');
  let responseJson = await response.json();
  console.log('[BackgroundFetch HeadlessTask response: ', responseJson);

  BackgroundFetch.finish();
}

// Register your BackgroundFetch HeadlessTask
BackgroundFetch.registerHeadlessTask(MyHeadlessTask);
AppRegistry.registerComponent(appName, () => App);

Your Environment

• Plugin version: 2.0.1
• Platform: Android
• OS version: Pie
• Device manufacturer / model: Huawei P20 Pro
• React Native version: 0.59.8
• Plugin config

Expected Behavior

Background function should work when app is terminated.

Actual Behavior

In the screenshot provided we see that the app logs as expected in the foreground/minimized, but when terminated the terminal logs ReactInstanceManager.detachViewFromInstance(), and when trying to run “adb shell cmd jobscheduler run -f <your.application.id> 999” the terminal doesnt log anything.

Steps to Reproduce

1. Start a new project and copy paste my 2 files.
2. Install background fetch dependency.
3. Run log and “adb shell cmd jobscheduler run -f <your.application.id> 999”.

Context

I copied the documentation examples, but its only working in the foreground/minimized. I think it has to do with the registerheadlesstask, but I dont know if the code I have given is enough to register it or not, and the documentation isn’t very clear.

Debug logs

• Android: $ adb logcat

[mikehardy]

@thuongtv-vn it’s worse than you think! Or better, if you are an apple user that wants long battery life.

Location services “use in background” is only granted by Apple if your app needs it as a core feature and in my experience they are strict on that.

Silent Push (that is: a cloud message sent to device that will not generate a notification for the user) have low delivery rates for apps and must not be relied on. You should assume they will not be delivered. A cloud message sent to device that will generate a notification will typically not wake the app, or if you have a notification extension it will run that native code for a brief moment (30s max) then app goes back to sleep

In general you just don’t get to run your app on iOS unless your user is interacting with it or it is generating visible notifications which the user has agreed to and keeps enabled.

[christocracy]

No. iOS halt background-fetch / background-task when user terminates the app.

there is no such thing as stopOnTerminate: false for iOS