Is it possible to redirect route with async code?

[MoonyDevs]

Hi all, does anybody has used https://github.com/jonataslaw/getx#redirect redirect with async code?
For instance if authservice.isAuthenticated return a future like this:

class AuthMiddleware extends GetMiddleware {
@OverRide
RouteSettings? redirect(String? route) async {
final AuthenticationApi _authService = AuthenticationApi();
bool isUserAuthenticated = await _authService.isUserAuthenticated();
return RouteSettings(
name: isUserAuthenticated ? route : Navigation.login);
}
}

[manikantag]

Hi, using redirectDelegate(), you can do that. Remember to use GetMaterialApp.router() to run the app.

See example app: https://github.com/jonataslaw/getx/blob/master/example_nav2/lib/app/middleware/auth_middleware.dart

[tony123S]

@manikantag hye, I tried your answer, but the method not calling. I need to check authToken in splashScreen. If not null and empty, redirect to mainPage, otherwise redirect to login page.

main

void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      initialRoute: '/splashScreen',
      getPages: [
        GetPage(
            name: '/splashScreen',
            page: () => SplashScreen(),
            binding: Bind(),
            middlewares: [GlobalMiddleware()]),
        GetPage(
            name: '/login',
            page: () => LoginPage(),
            binding: Bind(),
           ),
        GetPage(
            name: '/mainPage', page: () => MainPage(), binding: Bind())
      ],
          ....
        ),
      ),
      // home: SplashScreen(),
    );
  }
}

GlobalMiddleware

class GlobalMiddleware extends GetMiddleware {
  @override
  Future<GetNavConfig?> redirectDelegate(GetNavConfig route) async {
    print("calling here");
    var user = await MySharedPreferences().getUser();

    if (user.auth_token != "") {
      print("fefe");
      return GetNavConfig.fromRoute("/mainPage");
    } else if (user.auth_token == "" && user.auth_token == null) {
      print("efef");
      return GetNavConfig.fromRoute("/login");
    }
    print("efecsf");
    return await super.redirectDelegate(route);
  }
}

Output

[GETX] Instance "GetMaterialController" has been created
[GETX] Instance "GetMaterialController" has been initialized
[GETX] Redirect to null
[GETX] GOING TO ROUTE /splashScreen
I/us_work_factor( 3461): ProcessProfilingInfo new_methods=584 is saved saved_to_disk=1 resolve_classes_delay=8000
V/MiuiFrameworkFactory( 3461): get AllImpl object = android.common.MiuiFrameworkFactoryImpl@e330ee4
W/MirrorManager( 3461): this model don't Support

Do you know why? Thanks.

[manikantag]

Hey, as I mentioned you need to return GetMaterialApp.router() from your MyApp.build()

[manikantag]

Currently you are returning GetMaterialApp

[tony123S]

Hey, as I mentioned you need to return GetMaterialApp.router() from your MyApp.build()

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

  @override
  Widget build(BuildContext context) {
    return GetMaterialApp.router(
      // initialRoute: '/splashScreen',
      getPages: [
        GetPage(
            name: '/splashScreen',
            page: () => SplashScreen(),
            binding: Bind(),
            middlewares: [GlobalMiddleware()]),
        GetPage(
          name: '/login',
          page: () => LoginPage(),
          binding: Bind(),
        ),
        GetPage(
            name: '/mainPage', page: () => MainPage(), binding: Bind())
      ],
            ...
    );
  }
}

After change to GetMaterialApp.router(), it able to redirect to login page. But when I press submit button in login page to go to main page,I get another error.

Get.toNamed('/mainPage'); // after login button is pressed

Error

Reloaded 1 of 1342 libraries in 892ms.
E/flutter ( 7696): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Navigator.onGenerateRoute was null, but the route named "/mainPage" was referenced.
E/flutter ( 7696): To use the Navigator API with named routes (pushNamed, pushReplacementNamed, or pushNamedAndRemoveUntil), the Navigator must be provided with an onGenerateRoute handler.
E/flutter ( 7696): The Navigator was:

[manikantag]

Use `Get.rootDelegate.toXXX()` for routing.

…

On Sat, 6 Nov, 2021, 10:09 am Tony, ***@***.***> wrote: Hey, as I mentioned you need to return GetMaterialApp.router() from your MyApp.build() class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); @OverRide Widget build(BuildContext context) { return GetMaterialApp.router( // initialRoute: '/splashScreen', getPages: [ GetPage( name: '/splashScreen', page: () => SplashScreen(), binding: Bind(), middlewares: [GlobalMiddleware()]), GetPage( name: '/login', page: () => LoginPage(), binding: Bind(), ), GetPage( name: '/mainPage', page: () => MainPage(), binding: Bind()) ], ... ); } } After change to GetMaterialApp.router(), it able to redirect to login page. But when I press submit button in login page to go to main page,I get another error. Get.toNamed('/mainPage'); Reloaded 1 of 1342 libraries in 892ms. E/flutter ( 7696): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Navigator.onGenerateRoute was null, but the route named "/mainPage" was referenced. E/flutter ( 7696): To use the Navigator API with named routes (pushNamed, pushReplacementNamed, or pushNamedAndRemoveUntil), the Navigator must be provided with an onGenerateRoute handler. E/flutter ( 7696): The Navigator was: — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1566 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACNO46ETE57HW64OGXHAKLUKSWQ3ANCNFSM47DTIHBQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[tony123S]

Thanks ! But how about Get.offAll?

I get error on this line

Get.offAll(LoginPage(), binding: Bind());

Error
E/flutter (18076): [ERROR:flutter/shell/common/shell.cc(93)] Dart Unhandled Exception: 'package:flutter/src/widgets/overlay.dart': Failed assertion: line 423 pos 7: 'newEntriesList.every((OverlayEntry entry) => entry._overlay == null || entry._overlay == this)': One or more of the specified entries are already present in another Overlay., stack trace: #0 _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:46:39)

[fmdogan]

Late answer but may be helpful for newbies..

You should be aware of that with GetMaterialApp.router(..), you are using Navigator 2..
Get has another api to use Navigator 2 which is rootDelegate.
if you use Get.toNamed(..); with Navigator 2 api, you will need to use Get.rootDelegate.toNamed(..)..

So; routing api's on Get is for Navigator 1, api's on Get.rootDelegate are for Navigator 2.