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How to ask the user to turn on location in flutter

I’m asking users to grant permission for location, but I came to know that this permission is used to access location if location is enabled on the phone. I actually want to scan bluetooth devices and I’m using flutter blue plus package.

await Permission.location.isGranted;

So I want to check whether location is enabled, if not I want a pop up asking the user for the location in a similar manner to how we ask for bluetooth.

So I want it to be done on a flutter project.

I’m expecting a clear cut solution.

Thanks in advance.

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2

Answers


  1. 0

    To request users to turn on location services in a Flutter app, especially when working with Bluetooth scanning using the flutter_blue_plus package, you can follow these steps:

    1. Check Location Permission Status: Ensure that you have the necessary location permission.
    2. Request Location Services: Check if location services are enabled and prompt the user to enable them if they are not.

    Here’s a clear cut solution:

    Step 1: Add Required Packages

    First, add the necessary packages to your pubspec.yaml file:

    dependencies:
  flutter:
    sdk: flutter
  permission_handler: ^10.2.0
  flutter_blue_plus: ^1.4.0
  location: ^4.4.0

    Step 2: Implement the Location Permission and Services Check

    In your Dart file, import the necessary packages:

    import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:location/location.dart';
import 'package:flutter_blue_plus/flutter_blue_plus.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Location location = Location();
  bool _serviceEnabled = false;
  PermissionStatus _permissionGranted = PermissionStatus.denied;

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

  Future<void> _checkPermissions() async {
    // Check location permissions
    _permissionGranted = await Permission.location.status;
    if (_permissionGranted == PermissionStatus.denied ||
        _permissionGranted == PermissionStatus.permanentlyDenied) {
      _permissionGranted = await Permission.location.request();
      if (_permissionGranted != PermissionStatus.granted) {
        // Permission denied, show a dialog or a message
        return;
      }
    }

    // Check if location services are enabled
    _serviceEnabled = await location.serviceEnabled();
    if (!_serviceEnabled) {
      _serviceEnabled = await location.requestService();
      if (!_serviceEnabled) {
        // Location services are not enabled, show a dialog or a message
        return;
      }
    }

    // Continue with Bluetooth scanning or other operations
    _startBluetoothScan();
  }

  void _startBluetoothScan() {
    FlutterBluePlus flutterBlue = FlutterBluePlus.instance;
    // Start scanning for Bluetooth devices
    flutterBlue.startScan(timeout: Duration(seconds: 4));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Demo'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: _checkPermissions,
          child: Text('Check Location and Start Bluetooth Scan'),
        ),
      ),
    );
  }
}

    Explanation

    1. Import Packages:

      • permission_handler for handling permission requests.
      • location for checking and requesting location services.
      • flutter_blue_plus for Bluetooth operations.

    2. Check Location Permission:

      • Use Permission.location.status to check if location permission is granted.
      • If not, request the location permission using Permission.location.request().

    3. Check Location Services:

      • Use the Location class from the location package to check if location services are enabled.
      • If not, request the user to enable location services using location.requestService().

    4. Bluetooth Scanning:

      • If both location permission and services are enabled, start scanning for Bluetooth devices using the flutter_blue_plus package.

    Important Notes

    • Ensure your AndroidManifest.xml includes the necessary permissions:

      <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.BLUETOOTH_SCAN"/>
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>

    • For iOS, add the required permissions to your Info.plist:

      <key>NSBluetoothAlwaysUsageDescription</key>
<string>We need your permission to use Bluetooth</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>We need your location to scan for Bluetooth devices</string>

    This setup will prompt the user to enable location services and grant the necessary permissions, allowing you to proceed with Bluetooth scanning in your Flutter app.

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  2. 0

    try this snippet of code:

    import 'package:geolocator/geolocator.dart';
import 'package:nb_utils/nb_utils.dart';

Future<Position> checkLocationPremission() async {
  bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
  LocationPermission permission = await Geolocator.checkPermission();
  if (!serviceEnabled) {
    // do what you want
  }

  if (permission == LocationPermission.denied) {
    permission = await Geolocator.requestPermission();
    if (permission == LocationPermission.denied) {
      toast('Please location permission');
      logger.w("get User LocationPosition()");
      await Geolocator.openAppSettings();

      throw '${language.lblLocationPermissionDenied}';
    }
  }

  if (permission == LocationPermission.deniedForever) {
    throw "language lbl Location Permission Denied Permanently, please enable it from setting";
  }

  return await Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high).then((value) {
    return value;
  }).catchError((e) async {
    return await Geolocator.getLastKnownPosition().then((value) async {
      if (value != null) {
        return value;
      } else {
        throw "lbl Enable Location";
      }
    }).catchError((e) {
      toast(e.toString());
    });
  });
}
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