Location manger flutter

location_manger.dart

class LocationManager {

  Location location = new Location();
  bool _serviceEnabled = false;
  PermissionStatus? _permissionGranted;
  late LocationData _locationData;

  Function(LocationState) callback;

  LocationManager({required this.callback});

  Future<bool> requestService() async {
    callback.call(LocationState.loading());
    callback.call(LocationState(
        state: LocationEnum.REQUESTING_LOCATION_SERVICE,
        message: "Requesting location service"));
    _serviceEnabled = await location.serviceEnabled();
    if (!_serviceEnabled) {
      _serviceEnabled = await location.requestService();
      if (!_serviceEnabled) {
        return Future.value(false);
      }
    } else {
      return Future.value(true);
    }
    return Future.value(false);
  }

  Future<bool> requestPermission() async {
    _permissionGranted = await location.hasPermission();
    if (_permissionGranted == PermissionStatus.denied) {
      _permissionGranted = await location.requestPermission();
      if (_permissionGranted != PermissionStatus.granted) {
        return Future.value(false);
      } else {
        return Future.value(true);
      }
    } else {
      return Future.value(true);
    }
  }

  requestLocation() async {
    bool serviceEnabled = await requestService();
    if (!serviceEnabled) {
      callback.call(LocationState.error(
          message: "Service disabled, Please enable to continue"));
      return;
    }
    bool permissionState = await requestPermission();
    if (!permissionState) {
      callback.call(LocationState.error(
          message: "Permission denied, Please enable location to continue"));
      return;
    }
    callback.call(LocationState(
        state: LocationEnum.REQUESTING_LOCATION, message: "requesting location"));
    _locationData = await location.getLocation();
    callback.call(LocationState(
        state: LocationEnum.LOCATION_FOUND, location: _locationData));
  }
}