I am using the flutter geolocator package to get a device's current location. but, it is not returning the location and sends null values instead of longitude and latitude.

I have linked all the codes related to location access for Android and iOS.

Here is my code

loading_screen.dart

import 'package:flutter/material.dart';
import 'package:clima/services/location.dart';

class LoadingScreen extends StatefulWidget {
  @override
  _LoadingScreenState createState() => _LoadingScreenState();
}

class _LoadingScreenState extends State<LoadingScreen> {
  @override
  void initState() {
    super.initState();
    print('init state called');
    getLocation();
  }

  double? lat;
  double? long;

  void getLocation() async {
    Location location = Location();
    await location.getCurrentLocation();
    print(location.longitude);
    print(location.latitude);
    lat = location.latitude;
    long = location.longitude;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text('$lat & $long'),
      ),
    );
  }
}

location.dart

import 'package:geolocator/geolocator.dart';

class Location {
  double? longitude;
  double? latitude;

  Future<void> getCurrentLocation() async {
    try {
      Position position = await Geolocator.getCurrentPosition(
          desiredAccuracy: LocationAccuracy.lowest);
      longitude = position.longitude;
      latitude = position.latitude;
    } catch (e) {
      print(e);
    }
  }
}

Here is the console log

Running Gradle task 'assembleDebug'...
√  Built build\app\outputs\flutter-apk\app-debug.apk.
D/FlutterGeolocator( 9601): Attaching Geolocator to activity
D/FlutterGeolocator( 9601): Creating service.
D/FlutterGeolocator( 9601): Binding to location service.
D/FlutterGeolocator( 9601): Geolocator foreground service connected
D/FlutterGeolocator( 9601): Initializing Geolocator services
Debug service listening on ws://127.0.0.1:52220/Dm4z5g8IYT4=/ws
Syncing files to device SM A528B...
I/flutter ( 9601): init state called
I/BufferQueueProducer( 9601): [SurfaceView - com.kanuthakor.clima/com.kanuthakor.clima.MainActivity@e98a93d@0#1(BLAST Consumer)1](id:258100000001,api:1,p:9601,c:9601) queueBuffer: queued for the first time.
D/ViewRootImpl@797d88a[MainActivity]( 9601): Creating frameDrawingCallback nextDrawUseBlastSync=false reportNextDraw=true hasBlurUpdates=false
D/ViewRootImpl@797d88a[MainActivity]( 9601): Creating frameCompleteCallback
I/SurfaceView@e98a93d( 9601): uSP: rtp = Rect(0, 0 - 1080, 2265) rtsw = 1080 rtsh = 2265
I/SurfaceView@e98a93d( 9601): onSSPAndSRT: pl = 0 pt = 0 sx = 1.0 sy = 1.0
I/SurfaceView@e98a93d( 9601): aOrMT: uB = true t = android.view.SurfaceControl$Transaction@10aa451 fN = 1 android.view.SurfaceView.access$500:124 android.view.SurfaceView$SurfaceViewPositionUpdateListener.positionChanged:1728 android.graphics.RenderNode$CompositePositionUpdateListener.positionChanged:319 
I/SurfaceView@e98a93d( 9601): aOrMT: vR.mWNT, vR = ViewRootImpl@797d88a[MainActivity]
I/ViewRootImpl@797d88a[MainActivity]( 9601): mWNT: t = android.view.SurfaceControl$Transaction@10aa451 fN = 1 android.view.SurfaceView.applyOrMergeTransaction:1628 android.view.SurfaceView.access$500:124 android.view.SurfaceView$SurfaceViewPositionUpdateListener.positionChanged:1728 
I/ViewRootImpl@797d88a[MainActivity]( 9601): mWNT: merge t to BBQ
D/ViewRootImpl@797d88a[MainActivity]( 9601): Received frameDrawingCallback frameNum=1. Creating transactionCompleteCallback=false
I/BufferQueueProducer( 9601): [ViewRootImpl@797d88a[MainActivity]#0(BLAST Consumer)0](id:258100000000,api:1,p:9601,c:9601) queueBuffer: queued for the first time.
D/OpenGLRenderer( 9601): GPIS:: SetUp Pid : 9601    Tid : 9632
D/ViewRootImpl@797d88a[MainActivity]( 9601): Received frameCompleteCallback  lastAcquiredFrameNum=1 lastAttemptedDrawFrameNum=1
I/ViewRootImpl@797d88a[MainActivity]( 9601): [DP] pdf(0) 1 android.view.ViewRootImpl.lambda$addFrameCompleteCallbackIfNeeded$3$ViewRootImpl:4987 android.view.ViewRootImpl$$ExternalSyntheticLambda16.run:6 android.os.Handler.handleCallback:938 
I/ViewRootImpl@797d88a[MainActivity]( 9601): [DP] rdf()
D/ViewRootImpl@797d88a[MainActivity]( 9601): reportDrawFinished (fn: -1) 
I/ViewRootImpl@797d88a[MainActivity]( 9601): MSG_WINDOW_FOCUS_CHANGED 1 1
D/InputMethodManager( 9601): startInputInner - Id : 0
I/InputMethodManager( 9601): startInputInner - mService.startInputOrWindowGainedFocus
D/InputMethodManager( 9601): startInputInner - Id : 0

any help will be highly appreciated, thank you.

CodePudding user response：

Did you given these permissions?

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

You need to check run time permission and I didn't use your Location class.

import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';

//import 'package:clima/services/location.dart';

class LoadingScreen extends StatefulWidget {
  @override
  _LoadingScreenState createState() => _LoadingScreenState();
}

class _LoadingScreenState extends State<LoadingScreen> {
  @override
  void initState() {
    super.initState();
    print('init state called');
    getLocation();
  }

  double? lat;
  double? long;

  Future<Position> getLocation() async {
    Location location = Location();

    bool serviceEnabled;
    LocationPermission permission;
    print('inside getLoction1');

    // Test if location services are enabled.
    serviceEnabled = await Geolocator.isLocationServiceEnabled();
    if (!serviceEnabled) {
      // Location services are not enabled don't continue
      // accessing the position and request users of the
      // App to enable the location services.
      print('Location services are disabled.');
    }
    print('inside getLoction2');

    permission = await Geolocator.checkPermission();
    if (permission == LocationPermission.denied) {
      permission = await Geolocator.requestPermission();
      if (permission == LocationPermission.denied) {
        // Permissions are denied, next time you could try
        // requesting permissions again (this is also where
        // Android's shouldShowRequestPermissionRationale
        // returned true. According to Android guidelines
        // your App should show an explanatory UI now.
        print('Location permissions are denied');
      }
      print('inside getLoction3');
    }
    print('inside getLoction4');
    if (permission == LocationPermission.deniedForever) {
      // Permissions are denied forever, handle appropriately.
      print(
          'Location permissions are permanently denied, we cannot request permissions.');
    }
    print('inside getLoction5');
    final position = await Geolocator.getCurrentPosition();

    print(position.latitude);

    print(location.longitude);
    print(location.latitude);
    print('inside getLoctio6');
    lat = location.latitude;
    long = location.longitude;
    return position;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder<Position>(
          future: getLocation(),
          builder: (context, snapshot) {
            if (snapshot.connectionState == ConnectionState.waiting) {
              return Center(
                child: CircularProgressIndicator(),
              );
            }
            if (snapshot.connectionState == ConnectionState.done) {
              print(snapshot.data!.latitude);
              return Center(
                child: Text(
                    '${snapshot.data!.latitude}${snapshot.data!.longitude}'),
              );
            } else {
              return SizedBox.shrink();
            }
          }),
    );
  }
}

CodePudding user response：

The problem is most likely the use of LocationAccuracy.lowest. On Android this translates to the PASSIVE_INTERVAL setting. This means that the location request will not trigger the location services to fetch a location but instead only return location triggered by other clients actively requesting a location update.

You'd most likely want to update the accuracy to LocationAccuracy.low or higher if you want to actively trigger a location update and not rely on other applications to acquire a location for you.

Here is a complete overview of all accuracy options and their Android counterparts: