Flutter StopWatch Stream没有停止

如何解决Flutter StopWatch Stream没有停止

我为秒表创建了服务。

class StopWatchService {
  String timetodisplay = '00:00:00';
  Stopwatch swatch = Stopwatch();
  final duration = const Duration(seconds: 1);

  StreamController<String> stopWatchStreamController;


  void startTimer() {
    Timer(duration,keepRunning);
  }

  void keepRunning() {
    if (swatch.isRunning) {
      startTimer();
    }

    var hours = swatch.elapsed.inHours.toString().padLeft(2,"0");
    var minutes = (swatch.elapsed.inMinutes % 60).toString().padLeft(2,"0");
    var seconds = (swatch.elapsed.inSeconds % 60).toString().padLeft(2,"0");

    timetodisplay = hours + ':' + minutes + ':' + seconds;
    if (swatch.isRunning) {
      stopWatchStreamController.add(timetodisplay);
    }
    else {
      stopWatchStreamController.close();
    }

    // timeInSec = swatch.elapsed.inSeconds;
  }

  void start() {
    swatch.start();
    startTimer();
  }

  void stop() {
    print('ride service stop ${swatch.isRunning}');
    swatch.stop();
    // stopWatchStreamController.close();
    print('ride service stop 1 - ${swatch.isRunning}');
  }

  Stream<String> getStopWatchStream() {
    stopWatchStreamController = StreamController<String>(
      onListen: start,onCancel: stop,onResume: start,onPause: stop,);

    return stopWatchStreamController.stream;
  }
}

在我的mobx商店中，我已经添加了这些。

final RideService _rideService = RideService();
Stream<String> timerStream;
StreamSubscription<String> timerSubscription;

@observable
String movingTime;

  @action
  startTimer() {
    timerStream = _rideService.getStopWatchStream();
    timerSubscription = timerStream.listen((time) {
      print('event - $time');
      movingTime = time;
    });
  }

  @action
  stopTimer() {
    print('stopTimer');
    // _rideService.stop();
    timerSubscription.cancel();
    timerStream = null;
    print('dsadsadadad ${timerSubscription}');
  }

现在在小部件文件中，单击按钮时我正在调用startTimer，它工作正常。 但是当我在点击停止按钮时调用stopTimer时，计时器值仍在更新。

我不确定自己在做什么错。

谢谢