Flutter-permission-handler: App crashes if permissions disabled manually from app settings

[phanirithvij]

🐛 Bug Report

App crashes if any permission is disabled manually through the app's settings.

⭐️ replicable only in debug mode ⭐️

Expected behavior

The app shouldn't be affected

Reproduction steps

1. First, grant a permission using PermissionHandler().requestPermissions
2. Open the app settings using the provided function PermissionHandler().openAppSettings()
3. Disable the granted permission in step 1 from the app's permissions through its settings (While the app is running)
4. The app stops functioning properly (It turned black in my case)
5. This doesn't happen if a permission is enabled

I tried it for storage permission

can be replicated in the example app

import 'dart:io';

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
          actions: <Widget>[
            IconButton(
              icon: const Icon(Icons.settings),
              onPressed: () {
                PermissionHandler().openAppSettings().then((bool hasOpened) =>
                    debugPrint('App Settings opened: ' + hasOpened.toString()));
              },
            )
          ],
        ),
        body: Center(
          child: ListView(
              children: PermissionGroup.values
                  .where((PermissionGroup permission) {
                    if (Platform.isIOS) {
                      return permission != PermissionGroup.unknown &&
                          permission != PermissionGroup.sms &&
                          permission != PermissionGroup.storage &&
                          permission !=
                              PermissionGroup.ignoreBatteryOptimizations;
                    } else {
                      return permission != PermissionGroup.unknown &&
                          permission != PermissionGroup.mediaLibrary &&
                          permission != PermissionGroup.photos &&
                          permission != PermissionGroup.reminders;
                    }
                  })
                  .map((PermissionGroup permission) =>
                      PermissionWidget(permission))
                  .toList()),
        ),
      ),
    );
  }
}

class PermissionWidget extends StatefulWidget {
  const PermissionWidget(this._permissionGroup);

  final PermissionGroup _permissionGroup;

  @override
  _PermissionState createState() => _PermissionState(_permissionGroup);
}

class _PermissionState extends State<PermissionWidget> {
  _PermissionState(this._permissionGroup);

  final PermissionGroup _permissionGroup;
  PermissionStatus _permissionStatus = PermissionStatus.unknown;

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

    _listenForPermissionStatus();
  }

  void _listenForPermissionStatus() {
    final Future<PermissionStatus> statusFuture =
        PermissionHandler().checkPermissionStatus(_permissionGroup);

    statusFuture.then((PermissionStatus status) {
      setState(() {
        _permissionStatus = status;
      });
    });
  }

  Color getPermissionColor() {
    switch (_permissionStatus) {
      case PermissionStatus.denied:
        return Colors.red;
      case PermissionStatus.granted:
        return Colors.green;
      default:
        return Colors.grey;
    }
  }

  @override
  Widget build(BuildContext context) {
    return ListTile(
      title: Text(_permissionGroup.toString()),
      subtitle: Text(
        _permissionStatus.toString(),
        style: TextStyle(color: getPermissionColor()),
      ),
      trailing: IconButton(
          icon: const Icon(Icons.info),
          onPressed: () {
            checkServiceStatus(context, _permissionGroup);
          }),
      onTap: () {
        requestPermission(_permissionGroup);
      },
    );
  }

  void checkServiceStatus(BuildContext context, PermissionGroup permission) {
    PermissionHandler()
        .checkServiceStatus(permission)
        .then((ServiceStatus serviceStatus) {
      final SnackBar snackBar =
          SnackBar(content: Text(serviceStatus.toString()));

      Scaffold.of(context).showSnackBar(snackBar);
    });
  }

  Future<void> requestPermission(PermissionGroup permission) async {
    final List<PermissionGroup> permissions = <PermissionGroup>[permission];
    final Map<PermissionGroup, PermissionStatus> permissionRequestResult =
        await PermissionHandler().requestPermissions(permissions);

    setState(() {
      print(permissionRequestResult);
      _permissionStatus = permissionRequestResult[permission];
      print(_permissionStatus);
    });
  }
}

Configuration

Version: ^3.3.0

Platform:

:robot: Android

[OsamaAbbas]

I think this issue is not related to PermissionHandler itself. I remember that I encounter this issue without any plugins added at all. Changing the persmissions disconnects the app.

[phanirithvij]

Cool. The OS must be doing it, it should restart instead 🥺