Flutter: How to listen to the FirebaseUser is Email verified boolean?

Question

My Idea: I want to use the Firebase Auth Plugin in Flutter to register the users. But before they can access the App, they have to verify their Email addres

Answer 1

True. None of the FirebaseAuth idTokenChanges() , authStateChanges() or userChanges() will send you an event if the user verifies their email. I'm using a combination of the methods to get an email verification update in my app and it seems to be working well.

First I check the status in the initState() method and start a timer if email is not verified

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);

    //Get Authenticated user
    user = context.read().currentUser();
    _isEmailVerified = user.emailVerified;
    if (!_isEmailVerified) _startEmailVerificationTimer();

    }

I also listen for app background/foreground events in case the user happens to leave the app to confirm their email ( If you also do this, add WidgetsBindingObserver to your class)

 @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      user = context.read().reloadCurrentUser();
      if (user.emailVerified) {
        setState(() {
          _isEmailVerified = user.emailVerified;
        });
        timer?.cancel();
      } else {
        if (!timer.isActive) _startEmailVerificationTimer();
      }
    } 
  }

This is the _startEmailVerificationTimer() method

 _startEmailVerificationTimer() {
    timer = Timer.periodic(Duration(seconds: 5), (Timer _) {
      user = context.read().reloadCurrentUser();
      if (user.emailVerified) {
        setState(() {
          _isEmailVerified = user.emailVerified;
        });
        timer.cancel();
      }
    });
  }

Don't forget to dispose the timer

  @override
  void dispose() {
    timer?.cancel();
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

My Firebase User methods in case anyone is interested:

  User currentUser() {
    return _firebaseAuth.currentUser;
  }

  User reloadCurrentUser() {
    User oldUser = _firebaseAuth.currentUser;
    oldUser.reload();
    User newUser = _firebaseAuth.currentUser;
    return newUser;
  }