permission_handler_android/example/lib/main.dart

import 'package:baseflow_plugin_template/baseflow_plugin_template.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler_platform_interface/permission_handler_platform_interface.dart';

void main() {
  runApp(BaseflowPluginExample(
      pluginName: 'Permission Handler',
      githubURL: 'https://github.com/Baseflow/flutter-permission-handler',
      pubDevURL: 'https://pub.dev/packages/permission_handler',
      pages: [PermissionHandlerWidget.createPage()]));
}

///Defines the main theme color
final MaterialColor themeMaterialColor =
    BaseflowPluginExample.createMaterialColor(
        const Color.fromRGBO(48, 49, 60, 1));

/// A Flutter application demonstrating the functionality of this plugin
class PermissionHandlerWidget extends StatefulWidget {
  /// Create a page containing the functionality of this plugin
  static ExamplePage createPage() {
    return ExamplePage(
        Icons.location_on, (context) => PermissionHandlerWidget());
  }

  @override
  _PermissionHandlerWidgetState createState() =>
      _PermissionHandlerWidgetState();
}

class _PermissionHandlerWidgetState extends State<PermissionHandlerWidget> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: ListView(
          children: Permission.values
              .where((permission) {
                return permission != Permission.unknown &&
                    permission != Permission.mediaLibrary &&
                    permission != Permission.photos &&
                    permission != Permission.photosAddOnly &&
                    permission != Permission.reminders &&
                    permission != Permission.appTrackingTransparency &&
                    permission != Permission.criticalAlerts;
              })
              .map((permission) => PermissionWidget(permission))
              .toList()),
    );
  }
}

/// Permission widget containing information about the passed [Permission]
class PermissionWidget extends StatefulWidget {
  /// Constructs a [PermissionWidget] for the supplied [Permission]
  const PermissionWidget(this._permission);

  final Permission _permission;

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

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

  final Permission _permission;
  final PermissionHandlerPlatform _permissionHandler =
      PermissionHandlerPlatform.instance;
  PermissionStatus _permissionStatus = PermissionStatus.denied;

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

    _listenForPermissionStatus();
  }

  void _listenForPermissionStatus() async {
    final status = await _permissionHandler.checkPermissionStatus(_permission);
    setState(() => _permissionStatus = status);
  }

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

  @override
  Widget build(BuildContext context) {
    return ListTile(
      title: Text(
        _permission.toString(),
        style: Theme.of(context).textTheme.bodyText1,
      ),
      subtitle: Text(
        _permissionStatus.toString(),
        style: TextStyle(color: getPermissionColor()),
      ),
      trailing: (_permission is PermissionWithService)
          ? IconButton(
              icon: const Icon(
                Icons.info,
                color: Colors.white,
              ),
              onPressed: () {
                checkServiceStatus(
                    context, _permission as PermissionWithService);
              })
          : null,
      onTap: () {
        requestPermission(_permission);
      },
    );
  }

  void checkServiceStatus(
      BuildContext context, PermissionWithService permission) async {
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
      content: Text(
          (await _permissionHandler.checkServiceStatus(permission)).toString()),
    ));
  }

  Future<void> requestPermission(Permission permission) async {
    final status = await _permissionHandler.requestPermissions([permission]);

    setState(() {
      print(status);
      _permissionStatus = status[permission] ?? PermissionStatus.denied;
      print(_permissionStatus);
    });
  }
}