Example of Firebase Auth with Email and Password on Flutter?

Question

First time implementing Firebase Auth, also new to Flutter dev, and I'm looking to use email and passwords, not Google sign-in. The only examples I see of Firebase Auth being used are anonymously or with Google. Is there a resource / tutorial that shows how to properly set up the calls with the signInWithEmailAndPassword method?

Many thanks!

Answer 1

In my app I have an auth class because I don't like to litter my widget classes with non-widget code, but you can plop this code inside your widget class if you want.

In auth.dart I have:

import 'package:firebase_auth/firebase_auth.dart';

class Auth {
  final FirebaseAuth auth = FirebaseAuth.instance;

  Future<User> handleSignInEmail(String email, String password) async {
    UserCredential result =
        await auth.signInWithEmailAndPassword(email: email, password: password);
    final User user = result.user!;

    return user;
  }

  Future<User> handleSignUp(email, password) async {
    UserCredential result = await auth.createUserWithEmailAndPassword(
        email: email, password: password);
    final User user = result.user!;

    return user;
  }
}

Then in my login/register screen I create an instance of my auth class:

var authHandler = new Auth();

Finally, in my login buttons onPressed callback I have:

onPressed: () {
    authHandler.handleSignInEmail(emailController.text, passwordController.text)
    .then((FirebaseUser user) {
         Navigator.push(context, new MaterialPageRoute(builder: (context) => new HomePage()));
   }).catchError((e) => print(e));
}