Introduction:

Implementing sign-in buttons in Flutter provides users with an easy way to authenticate and access your app’s features. The flutter_signin_button package offers a variety of sign-in buttons for popular services like Google, Facebook, Twitter, and more. This tutorial will guide you through implementing sign-in buttons in Flutter using the flutter_signin_button package.

Content:

Step 1: Add the dependency:

Add the flutter_signin_button package to your pubspec.yaml file:

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dependencies:
  flutter_signin_button: ^2.1.0

Read more"Explore Flutter Widgets to Create Cross-Platform Apps"

Save the file and run flutter pub get to install the package.

Step 2: Import the package:

Import the flutter_signin_button package in your Dart file:

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import 'package:flutter/material.dart';
import 'package:flutter_signin_button/flutter_signin_button.dart';

Step 3: Create sign-in buttons:

Use the SignInButton widget to create sign-in buttons for different services. For example, to create a Google sign-in button:

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SignInButton(
  Buttons.Google,
  onPressed: () {
    // Handle Google sign-in
  },
),

You can create buttons for other services like Facebook, Twitter, GitHub, etc., by replacing Buttons.Google with the appropriate button type.

Step 4: Use the sign-in buttons in your UI:

Place the sign-in buttons in your app’s UI where you want them to appear:

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@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: Text('Sign In'),
    ),
    body: Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          SignInButton(
            Buttons.Google,
            onPressed: () {
              // Handle Google sign-in
            },
          ),
          SignInButton(
            Buttons.Facebook,
            onPressed: () {
              // Handle Facebook sign-in
            },
          ),
          SignInButton(
            Buttons.Twitter,
            onPressed: () {
              // Handle Twitter sign-in
            },
          ),
        ],
      ),
    ),
  );
}

Step 5: Customize the buttons (optional):

You can customize the appearance of the sign-in buttons by using the mini and text parameters. For example, to create a mini Google sign-in button with text:

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SignInButton(
  Buttons.Google,
  mini: true,
  text: "Sign in with Google",
  onPressed: () {
    // Handle Google sign-in
  },
),

Sample Code:

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import 'package:flutter/material.dart';
import 'package:flutter_signin_button/flutter_signin_button.dart';

class flutterSignInButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData.light(),
      home: Scaffold(
        appBar: AppBar(
          centerTitle: true,
          elevation: 2,
          title: Text(
            "Flutter Signin Button ",
            style: TextStyle(color: Colors.black),
          ),
          backgroundColor: Colors.blue[200],
        ),
        backgroundColor: const Color.fromRGBO(50, 50, 50, 1.0),
        body: SignInPage(),
      ),
      debugShowCheckedModeBanner: false,
    );
  }
}

class SignInPage extends StatelessWidget {
  /// Show a simple "___ Button Pressed" indicator
  void _showButtonPressDialog(BuildContext context, String provider) {
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
      content: Text('$provider Button Pressed!'),
      backgroundColor: Colors.black26,
      duration: const Duration(milliseconds: 400),
    ));
  }

  /// Normally the signin buttons should be contained in the SignInPage
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          SignInButtonBuilder(
            text: 'Get going with Email',
            icon: Icons.email,
            onPressed: () {
              _showButtonPressDialog(context, 'Email');
            },
            backgroundColor: Colors.blueGrey[700]!,
            width: 220.0,
          ),
          const Divider(),
          SignInButton(
            Buttons.Google,
            onPressed: () {
              _showButtonPressDialog(context, 'Google');
            },
          ),
          const Divider(),
          SignInButton(
            Buttons.GoogleDark,
            onPressed: () {
              _showButtonPressDialog(context, 'Google (dark)');
            },
          ),
          const Divider(),
          SignInButton(
            Buttons.FacebookNew,
            onPressed: () {
              _showButtonPressDialog(context, 'FacebookNew');
            },
          ),
          const Divider(),
          SignInButton(
            Buttons.Apple,
            onPressed: () {
              _showButtonPressDialog(context, 'Apple');
            },
          ),
          const Divider(),
          SignInButton(
            Buttons.GitHub,
            text: 'Sign up with GitHub',
            onPressed: () {
              _showButtonPressDialog(context, 'Github');
            },
          ),
          const Divider(),
          SignInButton(
            Buttons.Microsoft,
            text: 'Sign up with Microsoft ',
            onPressed: () {
              _showButtonPressDialog(context, 'Microsoft ');
            },
          ),
          const Divider(),
          SignInButton(
            Buttons.Twitter,
            text: 'Use Twitter',
            onPressed: () {
              _showButtonPressDialog(context, 'Twitter');
            },
          ),
          const Divider(),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              SignInButton(
                Buttons.LinkedIn,
                mini: true,
                onPressed: () {
                  _showButtonPressDialog(context, 'LinkedIn (mini)');
                },
              ),
              SignInButton(
                Buttons.Tumblr,
                mini: true,
                onPressed: () {
                  _showButtonPressDialog(context, 'Tumblr (mini)');
                },
              ),
              SignInButton(
                Buttons.Facebook,
                mini: true,
                onPressed: () {
                  _showButtonPressDialog(context, 'Facebook (mini)');
                },
              ),
              SignInButtonBuilder(
                icon: Icons.email,
                text: 'Ignored for mini button',
                mini: true,
                onPressed: () {
                  _showButtonPressDialog(context, 'Email (mini)');
                },
                backgroundColor: Colors.cyan,
              ),
            ],
          ),
        ],
      ),
    );
  }
}

Output:

Conclusion:

By following these steps, you can easily implement sign-in buttons in Flutter for various services using the flutter_signin_button package. These buttons provide a convenient way for users to sign in to your app using their preferred authentication method.

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