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class PedometerService {
  PedometerService();

  // pedometer package returns the steps taken since last system boot.
  // so we use this var for get only new steps
  int _lastCount = 0;

  // call it before start listening to newSteps
  Future<void> init() async {
    _lastCount =
        await Pedometer.stepCountStream.first.then((value) => value.steps);
  }

  Stream<int> get newSteps {
    return Pedometer.stepCountStream.map(
      (event) {
        final newSteps = event.steps - _lastCount;
        _lastCount = event.steps;
        return newSteps;
      },
    ).where(
      (e) => e != 0,
    );
  }
}