此小部件已卸载，因此 State 不再具有上下文（应视为已失效）。 当从 flutter 应用程序注销时

Question

I am using firebase with flutter to create the sign in methods. However, When I signout from my flutter app i get this error

This widget has been unmounted, so the State no longer has a context (and should be considered defunct).

and then when I sign in after this error, I get this error:

setState() or markNeedsBuild() called during build.

this is my code for sign out:

Future<void> signOut() async {
    if (googleSignIn.currentUser != null){
      await googleSignIn.disconnect();
      await FirebaseAuth.instance.signOut();}
    else{
      await FirebaseAuth.instance.signOut();
  }
  
    WidgetsBinding.instance.addPostFrameCallback((_) {
      Navigator.pushAndRemoveUntil(
        context,
        MaterialPageRoute(
          builder: (BuildContext context) => const AuthPage(),
        ),
            (route) => false,
      );
    });

  }

And here is the sign in code:

Future googleLogin() async{
     timer1 = Timer(const Duration(milliseconds: 1500), (){
       Navigator.of(context, rootNavigator: true).pop();
     });
     showDialog(context: context,
       barrierDismissible: false,
       builder: (context) =>   Center(
         child: SizedBox(
           width: 150, height: 150,
           child: LiquidCircularProgressIndicator(


             backgroundColor: const Color(0xFF5B84B1),
             valueColor: const AlwaysStoppedAnimation(Colors.white),



           ),
         ),
       ),
     ).then((value) {
       timer1!.cancel();
     });
     try {
       final googleUser =
       await GoogleSignIn(scopes: ['profile', 'email']).signIn();
       if (googleUser == null) return;
       _user = googleUser;

       final googleAuth = await googleUser.authentication;

       final credential = GoogleAuthProvider.credential(
         accessToken: googleAuth.accessToken,
         idToken: googleAuth.idToken,

       );

       UserCredential userCredential = await _auth.signInWithCredential(
           credential);

       if (userCredential.additionalUserInfo!.isNewUser == true) {
         if (!mounted) return;

         Navigator.pushAndRemoveUntil(
           context,
           MaterialPageRoute(
             builder: (BuildContext context) => const ProfilePage(),
           ),
               (route) => false,
         );
       }
       else {
         if (!mounted) return;

         Navigator.pushAndRemoveUntil(
           context,
           MaterialPageRoute(
             builder: (BuildContext context) => const HomeScreen(),
           ),
               (route) => false,
         );
       }
     } on PlatformException catch (e) {
       Utils.showSnackBar(e.toString());
     }

 }

I aprreciate any help

Answer 1

You can check if it is mounted or not, then proceed

if (mounted) {
     /// all actions are here 
   }

Answer 2

This usually happens when you are changing state inside a page lower in tree and then trying to access it from higher level of page in case of provider package same goes for firebase you're probably signing in and status is not transferred to the parent page.