I have tried eveything in my reach but didn't get the result. All i want to get the var lat and lon value from getLocation method

Question

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

are you trying to get the location from map or from the background? Have you added required dependencies in `pubspec.yaml` — Pragnesh Ghoda シ, Jun 08 '22 at 05:14
Try to follow this link and check if you have missed any steps https://mobikul.com/fetch-current-location-in-flutter/ — Pragnesh Ghoda シ, Jun 08 '22 at 05:15

score 0 · Answer 1 · answered Jun 08 '22 at 05:28

0

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.

answered Jun 08 '22 at 05:28

Behzad Shabanifard

68
6

score 0 · Answer 2 · answered Jun 08 '22 at 05:28

0

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.

answered Jun 08 '22 at 05:28

nvoigt

75,013
26
93
142

Thanks, It solves the problem, now i can fetch the value of lat and lon from getLocation, but there's one problem now, how can i call the method of getLocation, whenever i tries to print tha getLocation method, it will show Future instance of getLocation – Vipin Jun 08 '22 at 06:16
Indeed. You need to use `await` to get the actual value from a future. You already did that twice in your code. See: https://stackoverflow.com/questions/63017280/what-is-a-future-and-how-do-i-use-it – nvoigt Jun 08 '22 at 06:20

I have tried eveything in my reach but didn't get the result. All i want to get the var lat and lon value from getLocation method

2 Answers2