import 'package:geolocator/geolocator.dart';

class Location {
  double ? lat;
  double ? lon;

  void getLocation() async {
    Position position = await _determinePosition();
    lat = position.latitude;
    lon = position.longitude;
  }

  Future < Position > _determinePosition() async {
    LocationPermission permission;
    permission = await Geolocator.checkPermission();
    if (permission == LocationPermission.denied) {
      permission = await Geolocator.requestPermission();
      if (permission == LocationPermission.denied) {
        return Future.error('Permission Denied');
      }
    }
    return await Geolocator.getCurrentPosition();


  }
}

As you can see the error, i can't even assign the value of lat and lon,and if i put null in there, it will show 0 in result. And i put late then,it waill show runtime error for initiatize the value before

CodePudding user response：

Important thing is : Add the permission in manifest . Use permission handler and take permission from user. After checking that we have permission, use the geolocator.

CodePudding user response：

You have to await an async method, otherwise you don't lknow whether it's done yet. Since you managed to not return a Future<>, you cannot await your method. Matter of fact you didn't even try, otherwise you would have gotten a compiler error at that point.

Future<void> getLocation() async {
  Position position = await _determinePosition();
  lat = position.latitude;
  lon = position.longitude;
}

Now you need to find where you call this method and then await it. Only then your values will be filled.