[Bug]: When App was killed, it is not working

[Kimsoer]

Required Reading

• Confirmed

Plugin Version

latest

Flutter Doctor

[√] Flutter (Channel stable, 3.29.0, on Microsoft Windows [Version 10.0.22631.4974], locale en-US)
[√] Windows Version (11 Pro 64-bit, 23H2, 2009)
[√] Android toolchain - develop for Android devices (Android SDK version 35.0.1)
[√] Chrome - develop for the web
[X] Visual Studio - develop Windows apps
    X Visual Studio not installed; this is necessary to develop Windows apps.
      Download at https://visualstudio.microsoft.com/downloads/.
      Please install the "Desktop development with C++" workload, including all of its default components
[√] Android Studio (version 2024.2)
[√] VS Code (version 1.98.0)
[√] Connected device (4 available)
[√] Network resources

Mobile operating-system(s)

• iOS
• Android

Device Manufacturer(s) and Model(s)

android vivo

Device operating-systems(s)

android 12

What happened?

I got this log when i kill app.

Plugin Code and/or Config

var enabled = true.obs;
  var status = 0.obs;
  var events = <DateTime>[].obs;
  var elapsedTime = 0.obs;
  Timer? _timer;

  @override
  void onInit() {
    super.onInit();
    WidgetsBinding.instance.addObserver(this);
    initPlatformState();
    startTimer();
  }

  Future<void> initPlatformState() async {
    // Configure BackgroundFetch.
    int status = await BackgroundFetch.configure(
      BackgroundFetchConfig(
        minimumFetchInterval: 15,
        stopOnTerminate: false, // Continue running when the app is terminated.
        startOnBoot: true, // Start background fetch when the device boots.
        enableHeadless: true, // Enable headless task for Android.
        requiresBatteryNotLow: false,
        requiresCharging: false,
        requiresStorageNotLow: false,
        requiresDeviceIdle: false,
        requiredNetworkType: NetworkType.NONE,
        forceAlarmManager: true, // Use AlarmManager for better reliability.
      ),
          (String taskId) async {
        print("[BackgroundFetch] Event received $taskId");
        await updateElapsedTime();
        BackgroundFetch.finish(taskId);
      },
          (String taskId) async {
        print("[BackgroundFetch] TASK TIMEOUT taskId: $taskId");
        BackgroundFetch.finish(taskId);
      },
    );
    print('[BackgroundFetch] configure success: $status');
    this.status.value = status;
  }

  void startTimer() async {
    final prefs = await SharedPreferences.getInstance();
    final startTime = prefs.getInt('startTime') ?? DateTime.now().millisecondsSinceEpoch;
    final now = DateTime.now().millisecondsSinceEpoch;
    elapsedTime.value = (now - startTime) ~/ 1000; // Calculate elapsed time in seconds.

    _timer = Timer.periodic(Duration(seconds: 1), (timer) async {
      elapsedTime.value++;
      if (elapsedTime.value % 10 == 0) {
        // Send an event every 10 seconds.
        events.insert(0, DateTime.now());
        await sendLocationToTelegram(10, 2); // Example coordinates.
        print('[Timer] Event sent at ${DateTime.now()}');
      }
    });
  }

  Future<void> updateElapsedTime() async {
    final prefs = await SharedPreferences.getInstance();
    final startTime = prefs.getInt('startTime') ?? DateTime.now().millisecondsSinceEpoch;
    final now = DateTime.now().millisecondsSinceEpoch;
    elapsedTime.value = (now - startTime) ~/ 1000; // Update elapsed time in seconds.
  }

  void toggleEnabled(bool value) {
    enabled.value = value;
    if (value) {
      BackgroundFetch.start().then((int status) {
        print('[BackgroundFetch] start success: $status');
      }).catchError((e) {
        print('[BackgroundFetch] start FAILURE: $e');
      });
    } else {
      BackgroundFetch.stop().then((int status) {
        print('[BackgroundFetch] stop success: $status');
      });
    }
  }

  void checkStatus() async {
    int status = await BackgroundFetch.status;
    print('[BackgroundFetch] status: $status');
    this.status.value = status;
  }
  @override
  void onClose() {
    WidgetsBinding.instance.removeObserver(this); // Remove observer.
    _timer?.cancel(); // Stop the timer.
    super.onClose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.paused) {
      // App is sent to the background.
      _timer?.cancel(); // Stop the timer.
    } else if (state == AppLifecycleState.resumed) {
      // App is brought back to the foreground.
      startTimer(); // Restart the timer.
    }
  }

Relevant log output

I/flutter ( 7638): [Timer] Event sent at 2025-03-10 14:13:50.138851
I/GED     ( 7638): ged_boost_gpu_freq, level 100, eOrigin 2, final_idx 2, oppidx_max 2, oppidx_min 0
I/BufferQueueProducer( 7638): [SurfaceView[com.example.app_location_track/com.example.app_location_track.MainActivity]#1(BLAST Consumer)1](id:1dd600000001,api:1,p:7638,c:7638) disconnect: api 1
I/BufferQueueProducer( 7638): [SurfaceView[com.example.app_location_track/com.example.app_location_track.MainActivity]#1(BLAST Consumer)1](id:1dd600000001,api:0,p:-1,c:7638) disconnect: api -1
I/BufferQueueProducer( 7638): [ViewRootImpl[MainActivity]#0(BLAST Consumer)0](id:1dd600000000,api:1,p:7638,c:7638) disconnect: api 1
I/BLASTBufferQueue( 7638): [ViewRootImpl[MainActivity]#0] destructor()
I/BufferQueueConsumer( 7638): [ViewRootImpl[MainActivity]#0(BLAST Consumer)0](id:1dd600000000,api:0,p:-1,c:7638) disconnect
I/GED     ( 7638): ged_boost_gpu_freq, level 100, eOrigin 2, final_idx 2, oppidx_max 2, oppidx_min 0
I/GED     ( 7638): ged_boost_gpu_freq, level 100, eOrigin 2, final_idx 2, oppidx_max 2, oppidx_min 0
D/TSBackgroundFetch( 7638): ☯️  onPause
D/TSBackgroundFetch( 7638): ☯️  onStop
I/BLASTBufferQueue( 7638): releaseBufferCallbackThunk bufferId:32804960206852 framenumber:2 blastBufferQueue is dead
D/TSBackgroundFetch( 7638): ☯️  HeadlessMode? true

[christocracy]

See readme and learn to simulate fetch tasks in the terminal.