我试着创建一个有工厂方法的类，并把它作为一个单例类来使用。然而，我的类需要一些构造函数，这样做我总是不能正确地编写它
有可能传递构造函数并使用工厂方法吗？我还没能这么做。这是类

class LocationService {
  BuildContext context;
  late Position position;
  GeoPoint? initPosition;
  bool loadGeoFire = false;
  Function update_drivers;
  bool nearbyAvailableDriverKeysLoaded;
  bool removeDriverIcon;
  String? removeDriverKey;

  LocationService({
    required this.context,
    required this.update_drivers,
    required this.nearbyAvailableDriverKeysLoaded,
    required this.removeDriverIcon,
    required this.removeDriverKey,
    required this.initPosition,
    required this.loadGeoFire,
    // required this.position,
  });

  Future<void> locatePosition() async {
    final appData = context.read<AppData>();
    position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high);
    print("This is your Position:: " + position.toString());

    GeoPoint initPos =
        GeoPoint(latitude: position.latitude, longitude: position.longitude);

    initPosition = initPos;

    appData.initPosition = initPos;
    String address =
        // ignore: unnecessary_cast
        await (AssistantMethods.searchCoordinateAddress(position, context)
            as FutureOr<String>);
    print("This is your Address:: " + address);
    if (!loadGeoFire) {
      initializeGeoFire(
        position: position,
        update_drivers: update_drivers,
        nearbyAvailableDriverKeysLoaded: nearbyAvailableDriverKeysLoaded,
        removeDriverIcon: removeDriverIcon,
        removeDriverKey: removeDriverKey,
      );
      loadGeoFire = true;
    }
    // uName = userCurrentInfo.name;
    Provider.of<AppData>(context, listen: false).closeSplashScreen(false, true);
    AssistantMethods.retrieveHistoryInfo(context);
  }
}

我试过做这样的事

class LocationService {
  BuildContext context;
  late Position position;
  GeoPoint? initPosition;
  bool loadGeoFire = false;
  Function update_drivers;
  bool nearbyAvailableDriverKeysLoaded;
  bool removeDriverIcon;
  String? removeDriverKey;

  static final LocationService _instance = LocationService._internal(
    context: context,
    update_drivers: update_drivers,
    nearbyAvailableDriverKeysLoaded: nearbyAvailableDriverKeysLoaded,
    removeDriverIcon: removeDriverIcon,
    removeDriverKey: removeDriverKey,
    initPosition: initPosition,
    loadGeoFire: loadGeoFire,
    position: position,
  );

  factory LocationService() {
    return _instance;
  }

  LocationService._internal({
    required this.context,
    required this.update_drivers,
    required this.nearbyAvailableDriverKeysLoaded,
    required this.removeDriverIcon,
    required this.removeDriverKey,
    required this.initPosition,
    required this.loadGeoFire,
    required this.position,
  });

我不会工作虽然。不断得到错误The instance member 'context' can't be accessed in an initializer. Try replacing the reference to the instance member ..等我真的需要创建一个单例类吗？我调用locatePosition方法从不同的地方，读到这是一个很好的做法，并希望这样做。
这是我在另一个类中调用它的方式

@override
  Future<void> mapIsReady(bool isReady) async {
 
     
      LocationService locationService = LocationService(
        context: context,
        update_drivers: update_drivers,
        nearbyAvailableDriverKeysLoaded: nearbyAvailableDriverKeysLoaded,
        removeDriverIcon: removeDriverIcon,
        removeDriverKey: removeDriverKey,
        initPosition: initPosition,
        loadGeoFire: loadGeoFire,
      );

// calling the locatePosition method
      await locationService.locatePosition();
    }
  }