如何在未授予状态的情况下一直请求位置权限-Flutter

Question

我正在尝试在我的项目应用程序中请求用户的位置权限，因此在用户拒绝权限后，我想在用户尝试访问菜单时继续显示弹出窗口以请求位置权限。我使用这个函数成功做到了

trial() async {
    await Permission.locationAlways.request();
    print(Permission.locationAlways.status.then((value) {
      print("value:$value");
    }));
  }

但问题是..在状态为 PermissionStatus.permanentlyDenied 之后，询问位置权限的弹出窗口停止显示。有没有办法在不授予权限的情况下一直请求权限，或者有打开位置权限设置的方法？

Answer 1

您可以使用 permission_handler 8.3.0 包。

并用作：

if (await Permission.locationAlways.request().isGranted) {
print(Permission.locationAlways.status.then((value) {
  print("value:$value");
}));
}

更多详情：permission_handler

实施于：implementation on

Answer 2

请参考以下代码

class MyApp extends StatelessWidget {
  MyApp({Key key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primaryColor: Color(0xfff00B074),
        textTheme: const TextTheme(
          bodyText1: TextStyle(
              fontSize: 18.0,
              fontFamily: 'Barlow-Medium',
              color: Color(0xff464255)),
        ),
      ),
      home: PermissionHandlerScreen(),
    );
  }
}

class PermissionHandlerScreen extends StatefulWidget {
  @override
  _PermissionHandlerScreenState createState() =>
      _PermissionHandlerScreenState();
}

class _PermissionHandlerScreenState extends State<PermissionHandlerScreen> {
  @override
  void initState() {
    super.initState();
    permissionServiceCall();
  }

  permissionServiceCall() async {
    await permissionServices().then(
      (value) {
        if (value != null) {
          if (value[Permission.location].isGranted ) {
            /* ========= New Screen Added  ============= */

            Navigator.pushReplacement(
              context,
              MaterialPageRoute(builder: (context) => SplashScreen()),
            );
          }
        }
      },
    );
  }

  /*Permission services*/
  Future<Map<Permission, PermissionStatus>> permissionServices() async {
    // You can request multiple permissions at once.
    Map<Permission, PermissionStatus> statuses = await [
      Permission.location,
     
      //add more permission to request here.
    ].request();

    if (statuses[Permission.location].isPermanentlyDenied) {
      await openAppSettings().then(
        (value) async {
          if (value) {
            if (await Permission.location.status.isPermanentlyDenied == true &&
                await Permission.location.status.isGranted == false) {
              // openAppSettings();
              permissionServiceCall(); /* opens app settings until permission is granted */
            }
          }
        },
      );
    } else {
      if (statuses[Permission.location].isDenied) {
        permissionServiceCall();
      }
    }
    
    /*{Permission.camera: PermissionStatus.granted, Permission.storage: PermissionStatus.granted}*/
    return statuses;
  }

  @override
  Widget build(BuildContext context) {
    permissionServiceCall();
    return WillPopScope(
      onWillPop: () {
        SystemNavigator.pop();
      },
      child: Scaffold(
        body: Container(
          child: Center(
            child: InkWell(
                onTap: () {
                  permissionServiceCall();
                },
                child: Text("Click here to enable Enable Permission Screen")),
          ),
        ),
      ),
    );
  }
}

class SplashScreen extends StatelessWidget {
  const SplashScreen({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () {
        SystemNavigator.pop();
      },
      child: Scaffold(
        body: Center(
          child: Text(
            "Splash Screen",
          ),
        ),
      ),
    );
  }
}

如何在未授予状态的情况下一直请求位置权限-Flutter

How to keep asking location permission as long as the status is not granted-Flutter

permissions

location

permission-denied

flutter