Undefined name 'user' on Profile Page - Firebase Auth - flutter

Question

I have made signup and login pages, and they work perfect, but now I am trying to create a Profile page, but when I try to add Navigator or put the home in main.dart as Profile page, it doesn't work:
Main.dart:
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:mypocket/telas/perfil/Perfil.dart';
import 'firebase_options.dart';
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp(
);
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'My Pocket',
debugShowCheckedModeBanner: false,
theme: ThemeData(
),
home: Perfil(user: user,),
);
}
}
Perfil.dart:
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:mypocket/controllers/firebase_auth.dart';
import 'package:mypocket/controllers/validator.dart';
class Perfil extends StatefulWidget {
final User user;
Perfil({required this.user});
#override
_PerfilState createState() => _PerfilState();
}
class _PerfilState extends State<Perfil> {
late User _currentUser;
#override
void initState(){
_currentUser = widget.user;
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Color.fromARGB(255, 92, 172, 178),
centerTitle: true,
title: Text('Perfil'),
toolbarHeight: 90,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(40)
),
elevation: 15,
),
body: Container(
padding: EdgeInsets.all(32),
child: Column(mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
],
),
),
);
}
}
And this is firebase_auth.dart, created to make the authentication of the login and register pages:
import 'package:firebase_auth/firebase_auth.dart';
class FirebaseAuthHelper {
static Future<User?> registerUsingEmailPassword({
required String name,
required String email,
required String password,
}) async {
FirebaseAuth auth = FirebaseAuth.instance;
User? user;
try {
UserCredential userCredential = await auth.createUserWithEmailAndPassword(
email: email,
password: password,
);
user = userCredential.user;
await user!.updateProfile(displayName: name);
await user.reload();
user = auth.currentUser;
} on FirebaseAuthException catch (e) {
if (e.code == 'weak-password') {
print('The password provided is too weak.');
} else if (e.code == 'email-already-in-use') {
print('The account already exists for that email.');
}
} catch (e) {
print(e);
}
return user;
}
Also, if I remove user: user, it still doesn't work:

Answer 1

First of all, you have not created the instance of the User. To create that you can create using this.
class FirebaseAuthHelper {
FirebaseAuthHelper._();
static final instance = FirebaseAuthHelper._();
FirebaseAuth firebaseAuth = FirebaseAuth.instance;
Future<User?> registerUsingEmailPassword({
required String name,
required String email,
required String password,
}) async {
FirebaseAuth auth = FirebaseAuth.instance;
User? user;
try {
UserCredential userCredential = await
auth.createUserWithEmailAndPassword(
email: email,
password: password,
);
user = userCredential.user;
await user!.updateProfile(displayName: name);
await user.reload();
user = auth.currentUser;
} on FirebaseAuthException catch (e) {
if (e.code == 'weak-password') {
print('The password provided is too weak.');
} else if (e.code == 'email-already-in-use') {
print('The account already exists for that email.');
}
} catch (e) {
print(e);
}
return user;
}
I would suggest create a singleton class of your FirebaseAuthHelper so that you do not need to add a static keyword every time you can access any method of the class like this final auth = FirebaseAuthHelper.instance.
To access the method you just need to call it like this auth.registerUsingEmailPassword(parameters).
To get an instance of the User you can do like this
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:mypocket/telas/perfil/Perfil.dart';
import 'firebase_options.dart';
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp(
);
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// widget is the root of your application.
final auth = FirebaseAuthHelper.instance
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'My Pocket',
debugShowCheckedModeBanner: false,
theme: ThemeData(
),
home: Perfil(user:auth.firebaseAuth.currentUser),// To get current user
);
}
}
I hope this will help you