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

This verification isn't as straightforward as you'd hope. First, there is the problem of recognizing that the user has verified their email. Second, there is the issue that there isn't any sort of a notification you can listen to that will automatically trigger a change in your app.

Check this thread for info about emailVerified: https://github.com/flutter/flutter/issues/20390#issuecomment-514411392

I was only able to verify the user if I 1) Created their account, 2) Signed them in, 3) Then checked to make sure they verified their email.

final FirebaseAuth _auth = FirebaseAuth.instance;

var _authenticatedUser = await _auth.signInWithEmailAndPassword(email: _email, password: _password); 

//where _email and _password were simply what the user typed in the textfields.



if (_authenticatedUser.isEmailVerified) {
        //Verified
      } else {
        //Not verified
        }

Part 2: How do you get your app to recognize that the user has confirmed their email? Find a way to trigger the function that checks confirmation. A button would be easy enough. If you want it to see "automatic" then I guess you could create a timer that checks for email verification every 10 seconds or so.

I faced the same situation in my app. My solution was to create a periodic timer into the initState method of a strategic route to hold the app until the e-mail is verified. It is not so elegant as using a listener but works fine.

import 'dart:async';
import 'package:firebase_auth/firebase_auth.dart';

class _AccountConfirmationState extends State<AccountConfirmation> {

    late Timer _timer;

    @override
    void initState() {
      super.initState();
      
      _timer = Timer.periodic(const Duration(seconds: 5), (timer) async {
      await FirebaseAuth.instance.currentUser?.reload();
      final user = FirebaseAuth.instance.currentUser;
        if (user?.emailVerified ?? false) {
          timer.cancel();
          Navigator.pop(context, true);
        }
      });
    }

    @override
    void dispose() {
      super.dispose();
      _timer.cancel();
    }

    @override
    Widget build(BuildContext context) {
      //TODO: Implement your amazing waiting screen here
    }

}