I'm developing a GPS tracking app by using location. I've wrapped the intervals function to send latitude and longitude in API. It works on an emulator when the screen is locked and stay on home screen

  void _startInterval() {
   timerInterval = Timer.periodic(const Duration(seconds: 5), (timer) {
     _sendLocation(); // Send location to api
   });
  }

So when I'm building the APK to my device my application cannot send the location. Is there any way to send the location the same as the Emulator?

CodePudding user response：

Probably you dont have set the Permissons.

Add these permissions to AndroidManifest.xml inside tag:

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

...

And these to tag of Info.plist:

<!-- Permission options for the `location` group -->
<key>NSLocationWhenInUseUsageDescription</key>
<string>Need location when in use</string>
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Always and when in use!</string>
<key>NSLocationUsageDescription</key>
<string>Older devices need location.</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>Can I haz location always?</string>

Topic in another Thread

CodePudding user response：

you have to add permissions

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

you need to import flutter package

dependencies:
  flutter:
    sdk: flutter
  geolocator: ^8.0.0

Example code

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Home()
    );
  }
}

class Home extends  StatefulWidget {
  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {

  bool servicestatus = false;
  bool haspermission = false;
  late LocationPermission permission;
  late Position position;
  String long = "", lat = "";
  late StreamSubscription<Position> positionStream;

  @override
  void initState() {
    checkGps();
    super.initState();
  }

  checkGps() async {
    servicestatus = await Geolocator.isLocationServiceEnabled();
    if(servicestatus){
      permission = await Geolocator.checkPermission();

      if (permission == LocationPermission.denied) {
        permission = await Geolocator.requestPermission();
        if (permission == LocationPermission.denied) {
          print('Location permissions are denied');
        }else if(permission == LocationPermission.deniedForever){
          print("'Location permissions are permanently denied");
        }else{
          haspermission = true;
        }
      }else{
        haspermission = true;
      }

      if(haspermission){
        setState(() {
          //refresh the UI
        });

        getLocation();
      }
    }else{
      print("GPS Service is not enabled, turn on GPS location");
    }

    setState(() {
      //refresh the UI
    });
  }

  getLocation() async {
    position = await Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
    print(position.longitude); //Output: 80.24599079
    print(position.latitude); //Output: 29.6593457

    long = position.longitude.toString();
    lat = position.latitude.toString();

    setState(() {
      //refresh UI
    });

    LocationSettings locationSettings = LocationSettings(
      accuracy: LocationAccuracy.high, //accuracy of the location data
      distanceFilter: 100, //minimum distance (measured in meters) a
      //device must move horizontally before an update event is generated;
    );

    StreamSubscription<Position> positionStream = Geolocator.getPositionStream(
        locationSettings: locationSettings).listen((Position position) {
      print(position.longitude); //Output: 80.24599079
      print(position.latitude); //Output: 29.6593457

      long = position.longitude.toString();
      lat = position.latitude.toString();

      setState(() {
        //refresh UI on update
      });
    });
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
        appBar: AppBar(
            title: Text("Get GPS Location"),
            backgroundColor: Colors.redAccent
        ),
        body: Container(
            alignment: Alignment.center,
            padding: EdgeInsets.all(50),
            child: Column(
                children: [

                  Text(servicestatus? "GPS is Enabled": "GPS is disabled."),
                  Text(haspermission? "GPS is Enabled": "GPS is disabled."),

                  Text("Longitude: $long", style:TextStyle(fontSize: 20)),
                  Text("Latitude: $lat", style: TextStyle(fontSize: 20),)

                ]
            )
        )
    );
  }
}