getLocation() and onLocationChanged() blocks with no response.

[zedan185]

Now I added the package in my pubspec.yaml in the following way:

dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^0.1.0
  progress_hud:
     git: https://github.com/LampeMW/progress_hud/
  crypto: any
  validate: "^1.6.0"
  json_annotation: ^0.2.4
  image_picker: "^0.4.1"
  after_layout: "^1.0.4"
  firebase_messaging: #0.2.1
  device_info: ^0.2.1
#  geolocator: '^2.0.1'
  location: 
    git: https://github.com/Lyokone/flutterlocation.git/

And I tried the following two ways - both of them block and never return

//This method blocks
  Map<String, double> location = await new Location().onLocationChanged().single;

//This method also blocks and never continues
  currentLocation  = await  myLocation.Location().getLocation();

Here is the output from my flutter doctor

[✓] Flutter (Channel beta, v0.6.0, on Mac OS X 10.13.6 17G65, locale en-US) • Flutter version 0.6.0 at /Users/admin/Flutter/flutter • Framework revision 9299c02cf7 (8 weeks ago), 2018-08-16 00:35:12 +0200 • Engine revision e3687f70c7 • Dart version 2.1.0-dev.0.0.flutter-be6309690f

[✓] Android toolchain - develop for Android devices (Android SDK 28.0.0) • Android SDK at /Users/hsheikh/Library/Android/sdk • Android NDK location not configured (optional; useful for native profiling support) • Platform android-28, build-tools 28.0.0 • ANDROID_HOME = /Users/admin/Library/Android/sdk • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01) • All Android licenses accepted.

[✓] iOS toolchain - develop for iOS devices (Xcode 9.4.1) • Xcode at /Applications/Xcode.app/Contents/Developer • Xcode 9.4.1, Build version 9F2000 • ios-deploy 1.9.2 • CocoaPods version 1.5.0

[✓] Android Studio (version 3.1) • Android Studio at /Applications/Android Studio.app/Contents ✗ Flutter plugin not installed; this adds Flutter specific functionality. ✗ Dart plugin not installed; this adds Dart specific functionality. • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[✓] IntelliJ IDEA Ultimate Edition (version 2018.1.1) • IntelliJ at /Applications/IntelliJ IDEA.app • Flutter plugin version 24.0.2 • Dart plugin version 181.4445.29

[✓] Connected devices (1 available) • Android SDK built for x86 • emulator-5554 • android-x86 • Android 7.1.1 (API 25) (emulator)

• No issues found!

Any suggestions on what might be happening here. I tried the package geolocator and it behaves the same way except sometimes it would work (by not blocking). Why is this happening and how can I fix this ?

[timtraversy]

Did you request user permission before calling these? Does the permission dialogue pop up?

[mohlam12]

Same problem! await _location.getLocation(); gets stuck while await _location.hasPermissions() returns true.

It only works when I reinstall the app!

Also, this seems to have happened after my latest flutter upgrade.

---

[√] Flutter (Channel beta, v0.9.4, on Microsoft Windows [version 10.0.17134.345], locale fr-FR) • Flutter version 0.9.4 at C:\flutter • Framework revision f37c235c32 (3 weeks ago), 2018-09-25 17:45:40 -0400 • Engine revision 74625aed32 • Dart version 2.1.0-dev.5.0.flutter-a2eb050044

[√] Android toolchain - develop for Android devices (Android SDK 27.0.3) • Android SDK at C:\Users\lamha\AppData\Local\Android\sdk • Android NDK location not configured (optional; useful for native profiling support) • Platform android-27, build-tools 27.0.3 • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02) • All Android licenses accepted.

[√] Android Studio (version 3.1) • Android Studio at C:\Program Files\Android\Android Studio • Flutter plugin version 28.0.1 • Dart plugin version 173.4700 • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

[√] Connected devices (1 available) • Android SDK built for x86 • emulator-5554 • android-x86 • Android 8.1.0 (API 27) (emulator)

[timtraversy]

You're actually calling _location.getLocation() not _location.getLocation right?

[mohlam12]

Yes, forgot the parenthesis!

[mohlam12]

When I use _location.getLocation().then((val){}); this pops out

E/flutter ( 3845): [ERROR:flutter/shell/common/shell.cc(181)] Dart Error: Unhandled exception:
E/flutter ( 3845): PlatformException(ERROR, Failed to get location., null)
E/flutter ( 3845): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:551:7)
E/flutter ( 3845): #1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:279:18)
E/flutter ( 3845): <asynchronous suspension>
E/flutter ( 3845): #2      Location.getLocation (package:location/location.dart:12:8)

[timtraversy]

That is an error thrown by the Android implementation of the library when it fails to fetch a location: https://github.com/Lyokone/flutterlocation/blob/5919fed5fb689823cdce9a837e8a9711b892a6af/android/src/main/java/com/lyokone/location/LocationPlugin.java#L246

So it really feels like this would be a permissions error. Did you this line to your AndroidManifest.xml?

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

[mohlam12]

I do. And it does work fine when I kill/relaunch or reinstall the app.

It only stops working when the app resumes after a long break or on the emulator after a couple hot reloads

[gimox]

same error here! hangs on await _locationProvider.getLocation() only if i reject permission.

 _permission = await _locationProvider.hasPermission();

// on first run _permission = true, but i haven't confirmed yet the permission !!!
 if (_permission == false) {
     ....
  // on first run not enter here!!!!!!
 }

// hang here!!
 locationFirst = await _locationProvider.getLocation(); 

[MustafaProgramer]

same here, any solution?!

I do. And it does work fine when I kill/relaunch or reinstall the app.

It only stops working when the app resumes after a long break or on the emulator after a couple hot reloads

[gimox]

my solution is to use simple_permission plugin with location, now work very good.

I think we can consider to remove check permission from location plugin and let the user to use a more complete and update permission plugin

  Future<bool> checkPermission() async {
    bool hasPermission =
        await SimplePermissions.checkPermission(Permission.WhenInUseLocation);

    debugPrint(
        "*location_state_handler* permission for location: $hasPermission");

    if (hasPermission) {
      return true;
    }

    PermissionStatus permissionStatus =
        await SimplePermissions.requestPermission(Permission.WhenInUseLocation);

    debugPrint("permission request result is $permissionStatus");

    if (permissionStatus == PermissionStatus.authorized ||
        permissionStatus == PermissionStatus.restricted) {
      return true;
    }

    _setErrorLocation('permission denied');
    return false;
  }

  /// get position and observe or future changes
  Future<bool> getPosition([bool skipPermission = false]) async {
    if (skipPermission == false) {
      bool hasPermission = await checkPermission();

      if (hasPermission == false) {
        _setErrorLocation('permission denied');
        return false;
      }
    }

    /// get current position
    Location location = new Location();

    /// get current position, non blocking
    _getCurrentPosition(location);

    /// observe for future position
    _observePosition(location);

    return true;
  }

[Lyokone]

Hey ! I've modified the way permission is handled so it should be more reliable now ;)