Fetch location from android in background in flutter

Question

I am using below code to get the track the location of user. This works proper when my application in foreground. But when my application move to background it stop working and i can not get any location.

import 'dart:async';
import 'package:permission_handler/permission_handler.dart';
import 'package:geolocator/geolocator.dart';

class FetchLocation   {
  var geolocator = Geolocator();
  var locationOptions = LocationOptions(accuracy: LocationAccuracy.high, distanceFilter: 10,forceAndroidLocationManager: true,timeInterval: 1);
  void trackGeoLocation()async{
    final PermissionStatus permission = await PermissionHandler()
        .checkPermissionStatus(PermissionGroup.location);
      if(permission == PermissionStatus.granted){
        fetchLocation();
      }else{
        askPermission();
      }

  }
  void askPermission() {
    PermissionHandler().requestPermissions([PermissionGroup.locationAlways]).then(__onStatusRequested);
  }
  void __onStatusRequested(Map<PermissionGroup, PermissionStatus> statuses){
    final status = statuses[PermissionGroup.locationWhenInUse];

    print(status);
    if(status == PermissionStatus.restricted || status == PermissionStatus.neverAskAgain){
    } else if(status == PermissionStatus.denied){
      askPermission();
    }else{
      fetchLocation();
    }
  }
  void fetchLocation(){
    StreamSubscription<Position> positionStream = geolocator.getPositionStream(locationOptions).listen(
            (Position position) {
          print(position == null ? 'Unknown' : position.latitude.toString() + ', ' + position.longitude.toString());
        });
  }
}

Did you read: flutter.dev/docs/development/packages-and-plugins/… — Morrison Chang
– Morrison Chang, Commented Feb 27, 2020 at 20:51
this package might help you check this out pub.dev/packages/background_location — Kunchok Tashi
– Kunchok Tashi, Commented Jun 3, 2020 at 6:39

Simon Hutton · Accepted Answer · 2020-02-27 20:57:28Z

4

You are probably being hampered by the restrictions brought in with Android 8 (API 26) which limits the frequency that background apps can retrieve the current location.

This was brought in to save battery but it means that you will need to have a visible notification in order for Android to consider the app as being in the foreground. Otherwise it will only retrieve the location a few times per hour whilst the app is in the background.

https://developer.android.com/about/versions/oreo/background-location-limits gives you some further background (excuse the pun) information.

answered Feb 27, 2020 at 20:57

Simon Hutton

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2 Comments

ios developer Over a year ago

SimonH thank you for the answer. Yes it is getting called in background but it get called once in a while after 10-15min. I want to track the location continuously like Uber app.

Simon Hutton Over a year ago

You'll need to do something to make the OS think the app is in the foreground (like a visible notification) or run it in a service. I'm sure Google is your friend here. (I removed the link I placed here as it's a little out of date)

Tenten Ponce · Accepted Answer · 2023-09-06 09:48:35Z

0

Based on the accepter answer, creating a service and adding this line should solve the issue:

<service android:name="your foreground service"
  android:foregroundServiceType="location" /> <!-- add this -->

answered Sep 6, 2023 at 9:48

Tenten Ponce

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