Integrating Facebook login into your Flutter app can significantly enhance the user experience by providing seamless access via their existing accounts. This blog will walk you through the installation and configuration process with user-friendly instructions while offering troubleshooting tips along the way.

Getting Started with Facebook Login in Flutter

To kick things off, you’ll need to check if you’re working on an AndroidX project or not:

• If you’re not using AndroidX, utilize version 1.2.0.
• For AndroidX Flutter projects, go for versions 2.0.0 and above.

Installation Steps

Follow these steps carefully to get Facebook Login working in your Flutter application:

1. Declare a Dependency

In your Flutter project, you need to declare a pubspec dependency. Check the installation instructions on pub for detailed guidance.

2. Configure Android

Before diving into code, ensure you have associated your package name and provided the required key hashes by following the Facebook Login documentation for Android.

Once that’s done, locate your Facebook App ID in your Facebook Apps dashboard. You will be using this ID throughout your configuration.

File Configurations

Perform the following configurations in your project:

String Resource File

Add the following lines to your strings resource file located at your project root/android/app/src/main/res/values/strings.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">Your App Name here.</string>
    <!-- Replace 000000000000 with your Facebook App ID here. -->
    <string name="facebook_app_id">000000000000</string>
    <!-- Replace 000000000000 with your Facebook App ID here. -->
    <string name="fb_login_protocol_scheme">fb000000000000</string>
</resources>

Android Manifest

Next, make sure to modify your AndroidManifest.xml as follows:

<meta-data
    android:name="com.facebook.sdk.ApplicationId"
    android:value="@string/facebook_app_id"/>
<activity
    android:name="com.facebook.FacebookActivity"
    android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
    android:label="@string/app_name"/>
<activity
    android:name="com.facebook.CustomTabActivity"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.VIEW"/>
        <category android:name="android.intent.category.DEFAULT"/>
        <category android:name="android.intent.category.BROWSABLE"/>
        <data android:scheme="@string/fb_login_protocol_scheme"/>
    </intent-filter>
</activity>

3. Configure iOS

Make sure you’ve registered and configured your app with Facebook. Get your Facebook App ID and then add it to the Info.plist file located at your project root/ios/Runner/Info.plist:

<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLSchemes</key>
        <array>
            <!-- Replace 000000000000 with your Facebook App ID here. -->
            <string>fb000000000000</string>
        </array>
    </dict>
</array>

How to Use Facebook Login

To utilize the Facebook Login, you can follow the below Dart code snippet:

import 'package:flutter_facebook_login/flutter_facebook_login.dart';

final facebookLogin = FacebookLogin();

final result = await facebookLogin.logIn([FacebookPermission.email]);

switch (result.status) {
    case FacebookLoginStatus.loggedIn:
        _sendTokenToServer(result.accessToken.token);
        _showLoggedInUI();
        break;
    case FacebookLoginStatus.cancelledByUser:
        _showCancelledMessage();
        break;
    case FacebookLoginStatus.error:
        _showErrorOnUI(result.errorMessage);
        break;
}

Change Login Dialog Appearance

You can also force users to log in using the WebView dialog by implementing the following code:

facebookLogin.loginBehavior = FacebookLoginBehavior.webViewOnly;

Troubleshooting: Common Issues and Solutions

• If you experience issues with building your project, ensure you’ve completed the AndroidX setup. A quick solution is to add these lines in your android/gradle.properties:

android.useAndroidX=true
android.enableJetifier=true

• For more insights, updates, or to collaborate on AI development projects, stay connected with fxis.ai.

At fxis.ai, we believe that such advancements are crucial for the future of AI, as they enable more comprehensive and effective solutions. Our team is continually exploring new methodologies to push the envelope in artificial intelligence, ensuring that our clients benefit from the latest technological innovations.

Conclusion

By following the steps outlined above, you should be able to integrate Facebook login into your Flutter application with ease. Happy coding!