Integrating Google Login in Flutter using Provider State Management

In today's digital age, user authentication is one of the most crucial features that any mobile application should have. The Flutter framework provides a lot of tools and widgets to develop cross-platform applications with ease. In this article, we will be discussing how to integrate Google Login in Flutter using Provider State Management.

To start with, we need to create a Firebase project and enable the Google Sign-In option in the Firebase Console. To do this, follow these steps:

1. Go to the Firebase website and sign in with your Google account.

2. Click on the 'Create Project' button and enter a project name.

3. Select a Google account to link to the project.

4. Fill in the other required details and click on the 'Create Project' button.

Once you have created your Firebase project, enable the Google Sign-In option by following these steps:

1. Go to the Authentication tab in the Firebase Console.

2. Click on the 'Sign-in Method' option.

3. Enable the 'Google' option.

Now that we have set up our Firebase project and enabled the Google Sign-In option, let's move on to integrating Google Login in Flutter using Provider State Management.

To do this, create a new file called `user_provider.dart` in your project and paste the following code:

```dart

import 'package:flutter/foundation.dart';

import 'package:google_sign_in/google_sign_in.dart';

class UserProvider with ChangeNotifier {

GoogleSignInAccount _currentUser;

GoogleSignInAccount get currentUser => _currentUser;

Future signInWithGoogle() async {

final googleSignIn = GoogleSignIn();

try {

await googleSignIn.signIn();

} catch (e) {

print('Error signing in: $e');

}

Future signOut() async {

login google flutter

final googleSignIn = GoogleSignIn();

try {

await googleSignIn.signOut();

} catch (e) {

print('Error signing out: $e');

}

```

In this code, we are using the `GoogleSignInAccount` class from the `google_sign_in` package to store the user account information. We also have methods for signing in and signing out with Google.

To use the Provider package for state management, create a new file called `main.dart` and paste the following code:

```dart

import 'package:flutter/material.dart';

import 'package:provider/provider.dart';

import 'package:user_provider/user_provider.dart';

void main() {

runApp(

MultiProvider(

providers: '

ChangeNotifierProvider(create: (_) => UserProvider()),

child: MyApp(),

);

}

class MyApp extends StatelessWidget {

@override

Widget build(BuildContext context) {

return MaterialApp(

title: 'Flutter Demo',

home: HomeScreen(),

);

}

```

In this code, we are using the `MultiProvider` widget to wrap our `MyApp` widget. The `ChangeNotifierProvider` widget is used to create a new instance of the `UserProvider` class.

Finally, let's add a button to sign in with Google:

```dart

class HomeScreen extends StatelessWidget {

@override

Widget build(BuildContext context) {

return Scaffold(

appBar: AppBar(

title: Text('Flutter Demo'),

body: Center(

child: Column(

mainAxisAlignment: MainAxisAlignment.center,

children: '

ElevatedButton(

onPressed: () {

Provider.of(context, listen: false).signInWithGoogle();

child: Text('Sign in with Google'),

);

}

```

In this code, we are using the `ElevatedButton` widget to create a button that says 'Sign in with Google'. When the button is pressed, it calls the `signInWithGoogle` method from our `UserProvider` class.

That's it! With these steps, you should now be able to integrate Google Login in Flutter using Provider State Management.