CODEWITHSUNDEEP
flutterfirebasefirebase-authenticationgoogle-signin
vegatroz
vegatroz

Reputation: 44

Firebase currentuser authentication return null value after signed in

I am using Firebase authentication method to get detail info of the signed in user (i.e. displayname and photourl). My code is as follow:

final user = FirebaseAuth.instance.currentUser!;

After succesfully signed in, I signed out to return to the login screen. However, when I tried to sign in again, I got an error referring to the code above: "Null operator used on null value."

Any sugestion on the problem?

Upvotes: 0

Views: 1363

Answers (1)

Vihanga Randunu
Vihanga Randunu

Reputation: 421

You have to listen to the auth state changes. Add this method to your Authentication class.

Future<void> initializeUser(BuildContext context) async {
    FirebaseAuth.instance.authStateChanges().listen(
      (User? user) async {
        if (user == null) {
          print('user is signed out');

          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => const LoginScreen(),
            ),
          );
        } else {
        
          await fetchUserData(); // handle fetching user data

          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => const MyHomePage(),
            ),
          );
          print('user has signed in');
          
        }
      },
    );
  }

Upvotes: 2

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