Firebase Auth state check in Flutter

Question

Currently I need to set up a check whether a user is logged in or not to then act accordingly (open home or log in screen). I\'m using only email authentication.

Answer 1

You can also check your auth status inside initState like so:

class CheckAuth extends StatefulWidget {
  @override
  _CheckAuthState createState() => new _CheckAuthState();
}

class _CheckAuthState extends State<CheckAuth> {
  bool isLoggedIn;
  @override
  void initState() {
    isLoggedIn = false;
    FirebaseAuth.instance.currentUser().then((user) => user != null
        ? setState(() {
            isLoggedIn = true;
          })
        : null);
    super.initState();
    // new Future.delayed(const Duration(seconds: 2));
  }

  @override
  Widget build(BuildContext context) {
    return isLoggedIn ? new Home() : new LoginScreen();
  }
}

Answer 2

What about

FirebaseAuth.instance.onAuthStateChanged.listen((user) {
  setState(() => isAuthenticated = user != null);
})