只要状态没有被授予，如何一直询问位置权限-Flutter

Question

我试图在我的项目应用程序中询问用户的位置权限，因此在用户拒绝该权限后，我想在用户尝试访问菜单时继续显示询问位置权限的弹出窗口。我通过使用此功能成功地做到了这一点

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 后，询问位置权限的弹出窗口停止显示。有没有办法在未授予权限的情况下始终请求权限或打开位置权限设置的方法？

Answer 1

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",
          ),
        ),
      ),
    );
  }
}

Answer 2

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