Service stops when app is killed

[aeropagz]

As title says, the service is closed when the app is killed. Is this the right behavior? If so is there a way to prevent this?

[Dev-hwang]

The service works normally for actions that move to the background (back button, home button, screen off, remove from the list of recently launched apps, etc). But, service termination cannot be prevented by forcibly stopping the app in the processor manager or application information screen.

[aeropagz]

In this article they say it is possible. Is this out of date?

[Dev-hwang]

This plugin is already implemented in a similar way as in this article.
ForegroundService.kt

I know that forced process killing by the user or the system cannot be prevented. If there is a better way, please let me know.

[aeropagz]

Ah well I see. Thnx for your fast reply. Just one more question, is there a way to limit sensor requests? I tried to fetch only the first element in onStart callback of the stream and thought due to the foregroundTaskOptions it would restart again but it didn't.

Example:

...
foregroundTaskOptions: const ForegroundTaskOptions(
        interval: 1000 * 60 * 15, //every 15th min
        autoRunOnBoot: true,
      ),
....


...
@override
  Future<void> onStart(DateTime timestamp, SendPort? sendPort) async {
    final pedometer = Pedometer.stepCountStream;
    final StepCount event = await pedometer.first;
    FlutterForegroundTask.updateService(
        notificationTitle: 'Current steps', notificationText: '${event.steps}');
    sendPort?.send(event);
  }
...

Expected behavior: Every 15th min I get the amount of steps of sensor.

What did I wrong?

[Dev-hwang]

The TaskHandler implementation class has 3 functions (onStart, onEvent, onDestroy).

onStart: Called when the task is started. Called only once in a lifecycle.
onEvent: Called when an event occurs. According to the settings above, it will be called every 15 minutes.
onDestroy: Called when the task is destroyed. Called only once in a lifecycle.

So do the above code in onEvent.

  @override
  Future<void> onEvent(DateTime timestamp, SendPort? sendPort) async {
    final pedometer = Pedometer.stepCountStream;
    final StepCount event = await pedometer.first;
    FlutterForegroundTask.updateService(
        notificationTitle: 'Current steps', notificationText: '${event.steps}');
    sendPort?.send(event);
  }

[aeropagz]

Ah great! Thnx again and nice lib!

[jairusfdes]

I am trying something similar, but when i try to access the Pedometer package (https://pub.dev/packages/pedometer) in my task handler it doesn't work. the sensor event listeners are not registered . I don't see any errors in the logs.
If i call the pedometer from my app it works . but not if i put it in the handler . Is there some other setup for the Handler to be able to initate the pedometer package sensor ?