Class cast exception

[zawadZwd]

Hello there,
tldr; when i'm trying to start foreground tast I get this exception:

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long
	at com.pravera.flutter_foreground_task.service.ForegroundServiceManager.saveOptions(ForegroundServiceManager.kt:98)
	at com.pravera.flutter_foreground_task.service.ForegroundServiceManager.start(ForegroundServiceManager.kt:24)
	at com.pravera.flutter_foreground_task.MethodCallHandlerImpl.onMethodCall(MethodCallHandlerImpl.kt:47)
	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
	at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
	at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:818)
	at android.os.MessageQueue.nativePollOnce(Native Method)
	at android.os.MessageQueue.next(MessageQueue.java:325)
	at android.os.Looper.loop(Looper.java:142)
	at android.app.ActivityThread.main(ActivityThread.java:6944)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

My code is pretty much like in the example and I have no clue where to find the problem. In a task, I'm displaying the timestamp so I do not know what kind of integer is trying to be cast into long.

[zawadZwd]

EDIT. Forget about it, I didn't add service to AndroidManifest. But in the issue above, all code was done step by step with the documentation.

This is getting weirder and weirder. I took your example and installed it on the device with Android 8.0, when I clicked the start button, the console shows me only:
[log] 2021-07-14 11:35:00.822222 FlutterForegroundTask started.
and nothing else appears.

The same happened on Android 10 and 11.

[Dev-hwang]

@zawadZwd
Can you show me the callback() function you implemented?

[zawadZwd]

Sure thing

void geolocatorCallback() async {
  try {
    FlutterForegroundTask.initDispatcher((timestamp) async {
      var localization = await Geolocator.getCurrentPosition();
      dev.log('timestamp: ${timestamp.toString().substring(0, 19)}');
      FlutterForegroundTask.update(
        notificationTitle: 'Current GPS localization',
        notificationText: '${localization.latitude}, ${localization.longitude}',
      );
    }, onDestroy: (timestamp) async {
      dev.log('geolocatorCallback() is dead.. x_x');
    });
  } catch (e) {
    dev.log('Geolocator callback error: $e');
  }
}

Even without localization variable the result is the same

[zawadZwd]

But from my observation looks like the issue occurs after invoking task trigger:

Future<void> turnOnGps() async {
      try {
        var localization = await Geolocator.getCurrentPosition();
        FlutterForegroundTask.start(
          notificationTitle: 'Current GPS localization',
          notificationText: '${localization.latitude}, ${localization.longitude}',
          callback: geolocatorCallback,
        );
      } catch (e) {
        print('Error: $e');
      }
  }

[Dev-hwang]

@zawadZwd
yes. I'll test it in a little bit and let you know the results.

[Dev-hwang]

@zawadZwd
The first issue is a type casting error that can be fixed quickly. I will update it as soon as possible to prevent any bugs from occurring :)

The second issue is most likely a permission issue. Check this out.

1. Make sure you have added background permission.

<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

2. Make sure the location permission is always allowed. I recently saw a problem with the Geolocator plugin that didn't work well for permission requests. requestPermission not working when "ACCESS_BACKGROUND_LOCATION" is given Baseflow/flutter-geolocator#771
   

3. This is the best way to do this if you are providing streams to the plugins you want to use.

void callback() {
  final positionStream = Geolocator.getPositionStream();
  StreamSubscription<Position>? streamSubscription;

  FlutterForegroundTask.initDispatcher((timestamp) async {
    if (streamSubscription != null) return;

    streamSubscription = positionStream.listen((event) {
      print('timestamp: ${timestamp.toString()}');

      FlutterForegroundTask.update(
          notificationTitle: 'Current GPS localization',
          notificationText: '${event.latitude}, ${event.longitude}');
    });
  }, onDestroy: (timestamp) async {
    await streamSubscription?.cancel();
    print('callback() is dead.. x_x');
  });
}

[Dev-hwang]

@zawadZwd
Fixed a type casting error. Upgrade to flutter_foreground_task: ^2.0.5.

[zawadZwd]

You rock! Things work perfectly fine now :)
fun - and strange - fact is the previous version, ^2.0.4, worked well on M1 Macbook with the Android emulator, after cloning repo to windows, it stops. But now it doesn't even matter ;) time to close it. Thank you very very much!