I am trying to build a log in and logout feature in flutter using firebase auth. I have created the UI and have even assigned controllers to the email and password. My project is also connected to firebase and all relevant packages installed. After I log in, a new page is supposed to open displaying "Signed In" and if not logged in then display the login page. I have entered the correct email and password according to what I created on firebase but am not being shown the home page as it should be, instead I am still on the login page.
The following is the code:
main.dart:
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:my_sample/widgets/main_page.dart';
Future main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
debugShowCheckedModeBanner: false,
home: MainPage(),
);
}
}
main_page.dart:
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:my_sample/widgets/home_page.dart';
import 'package:my_sample/widgets/login_page.dart';
class MainPage extends StatelessWidget {
const MainPage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
body: StreamBuilder<User?>(
stream: FirebaseAuth.instance.authStateChanges(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return const HomePage();
} else {
return const LoginPage();
}
}
),
);
}
}
login_page.dart:
import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_fonts/google_fonts.dart';
class LoginPage extends StatefulWidget {
const LoginPage({Key? key}) : super(key: key);
@override
State<LoginPage> createState() => _LoginPageState();
}
class _LoginPageState extends State<LoginPage> {
// text controllers
final _emailController = TextEditingController();
final _passwordController = TextEditingController();
Future signIn() async {
await FirebaseAuth.instance.signInWithEmailAndPassword(
email: _emailController.text.trim(),
password: _passwordController.text.trim(),
);
}
@override
void dispose() {
_emailController.dispose();
_passwordController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.grey[300],
body: SafeArea(
child: Center(
child: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
const Icon(
Icons.android,
size: 100,
),
const SizedBox(height: 75),
// Hello Again!
Text(
'Hello Again!',
style: GoogleFonts.bebasNeue(
fontSize: 52,
),
),
const SizedBox(
height: 10,
),
const Text(
'Welcome back, you\'ve been missed!',
style: TextStyle(
fontSize: 20,
),
),
const SizedBox(height: 50),
// email textfield
Padding(
padding: const EdgeInsets.symmetric(horizontal: 25.0),
child: TextField(
controller: _emailController,
decoration: InputDecoration(
enabledBorder: OutlineInputBorder(
borderSide: const BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(12),
),
focusedBorder: OutlineInputBorder(
borderSide: const BorderSide(color: Colors.deepPurple),
borderRadius: BorderRadius.circular(12),
),
hintText: 'Email',
fillColor: Colors.grey[200],
filled: true,
),
),
),
const SizedBox(height: 10),
// password textfield
Padding(
padding: const EdgeInsets.symmetric(horizontal: 25.0),
child: TextField(
controller: _passwordController,
obscureText: true,
decoration: InputDecoration(
enabledBorder: OutlineInputBorder(
borderSide: const BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(12),
),
focusedBorder: OutlineInputBorder(
borderSide: const BorderSide(color: Colors.deepPurple),
borderRadius: BorderRadius.circular(12),
),
hintText: 'Password',
fillColor: Colors.grey[200],
filled: true,
),
),
),
const SizedBox(height: 10),
// sign in button
Padding(
padding: const EdgeInsets.symmetric(horizontal: 25.0),
child: GestureDetector(
onTap: signIn,
child: Container(
padding: const EdgeInsets.all(20),
decoration: BoxDecoration(
color: Colors.deepPurple,
borderRadius: BorderRadius.circular(12),
),
child: const Center(
child: Text(
'Sign In',
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 18,
),
),
),
),
),
),
const SizedBox(height: 25),
// not a member? register now
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const [
Text(
'Not a member?',
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
Text(
' Register Now',
style: TextStyle(
color: Colors.blue,
fontWeight: FontWeight.bold,
),
),
],
),
],
),
),
),
),
);
}
}
home_page.dart:
import 'package:flutter/material.dart';
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
@override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
return const Scaffold(
body: Text('Signed in'),
);
}
}
CodePudding user response：
This code should work.
1 - Make sure the user is created in Firebase Console (authentication).
2 - If you are not using Google SignIn, I suggest using the recent launched "automatic" Firebase configuration (instead of the manual). That will rule out any configuration issues you might have. FirebBase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
3 - Check for errors when calling signIn method: await FirebaseAuth.instance .signInWithEmailAndPassword( email: _emailController.text.trim(), password: _passwordController.text.trim(), ).catchError((error) => print(error));