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

Auth state change listener didn't work for me. Field isEmailVerified remains false even after user verifies his email.

My workaround: Started from the assumption that user leaves the app to verify his email (which mean app is paused), and he returns to the app after verifying it (app resumes).

What I did was attach a WidgetsBinding to a relevant stateful widget where I wanted to display if email was verified (but can be done elsewhere). This involves two steps.

First step is to attach the binding:

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

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

Second step is to override the didChangeAppLifecycleState to reload the user. I created a function that does the reload and sets a new firebaseUser object

  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed && !firebaseUser.isEmailVerified)
      refreshFirebaseUser().then((value) => setState(() {}));
    super.didChangeAppLifecycleState(state);
  }
  Future refreshFirebaseUser() async {
    await firebaseUser.reload();
    firebaseUser = FirebaseAuth.instance.currentUser;
  }

So what this is basically doing is to reload firebase user object everytime the user returns to the app, while its email is not verified. I chose this solution over setting and cancelling a timer as it avoided setting a recurrent action through a timer which could be overkill for this particular problem.