flutter_login_facebook

pub package

Flutter Plugin to login via Facebook.

Easily add Facebook login feature in your application. User profile information included.

SDK version

Facebook SDK version, used in plugin:

Minimum requirements

  • iOS 9.0 and higher.
  • Android 4.1 and newer (SDK 16).

Getting Started

To use this plugin:

  1. add flutter_login_facebook as a dependency in your pubspec.yaml file;
  2. setup android;
  3. setup ios;
  4. additional Facebook app setup;
  5. use plugin in application.

See Facebook Login documentation for full information.

Android

Go to Facebook Login for Android - Quickstart.

Select an App or Create a New App

You need to complete Step 1: Select an App or Create a New App.

Skip Step 2 (Download the Facebook App) and Step 3 (Integrate the Facebook SDK).

Edit Your Resources and Manifest

Complete Step 4: Edit Your Resources and Manifest

  • Add values to /android/app/src/main/res/values/strings.xml (create file if not exist)
  • Add meta-data element and activities in android/app/src/main/AndroidManifest.xml, section application:
    <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>

See full AndroidManifest.xml in example.

Setup Facebook App

Complete Step 5: Associate Your Package Name and Default Class with Your App.

  1. Set Package Name - your package name for Android application (attribute package in AndroidManifest.xml).
  2. Set Default Activity Class Name - your main activity class (with package). By default it would be com.yourcompany.yourapp.MainActivity.
  3. Click "Save".

Complete Step 6: Provide the Development and Release Key Hashes for Your App.

  1. Generate Development and Release key as described in documentation. Note: if your application uses Google Play App Signing than you should get certificate SHA-1 fingerprint from Google Play Console and convert it to base64
echo "{sha1key}" | xxd -r -p | openssl base64
  1. Add generated keys in Key Hashes.
  2. Click "Save".

⚠️ Important! You should add key hashes for every build variants. E.g. if you have CI/CD which build APK for testing with it's own cerificate (it may be auto generated debug cetificate or some another) than you should add it's key too.

In next Step 7 Enable Single Sign On for Your App you can enable Single Sing On if you want to.

And that's it for Android.

iOS

Go to Facebook Login for iOS - Quickstart.

Select an App or Create a New App

You need to complete Step 1: Select an App or Create a New App. If you create app while setup for Android than use it.

Skip Step 2 (Set up Your Development Environment) and Step 3 (Integrate the Facebook SDK).

Register and Configure Your App with Facebook

Complete Step 3: Register and Configure Your App with Facebook.

  1. Add your Bundle Identifier - set Bundle ID (you can find it in Xcode: Runner - Target Runner - General, section Identity, field Bundle Identifier) and click "Save".
  2. Enable Single Sign-On for Your App if you need it and click "Save".

Configure Your Project

Complete Step 4: Configure Your Project.

Configure info.plist:

  1. In Xcode right-click on Info.plist, and choose Open As Source Code.
  2. Copy and paste the following XML snippet into the body of your file (<dict>...</dict>), replacing [APP_ID] with Facebook application id and [APP_NAME] with Facebook application name (you can copy prepared values from Step 4 in Facebook Quickstart).
<key>CFBundleURLTypes</key>
<array>
  <dict>
  <key>CFBundleURLSchemes</key>
  <array>
    <string>fb[APP_ID]</string>
  </array>
  </dict>
</array>
<key>FacebookAppID</key>
<string>[APP_ID]</string>
<key>FacebookDisplayName</key>
<string>[APP_NAME]</string>
  1. Also add in Info.plist body (<dict>...</dict>):
<key>LSApplicationQueriesSchemes</key>
<array>
  <string>fbapi</string>
  <string>fbapi20130214</string>
  <string>fbapi20130410</string>
  <string>fbapi20130702</string>
  <string>fbapi20131010</string>
  <string>fbapi20131219</string>
  <string>fbapi20140410</string>
  <string>fbapi20140116</string>
  <string>fbapi20150313</string>
  <string>fbapi20150629</string>
  <string>fbapi20160328</string>
  <string>fbauth</string>
  <string>fb-messenger-share-api</string>
  <string>fbauth2</string>
  <string>fbshareextension</string>
</array>

⚠️ NOTE. Check if you already have CFBundleURLTypes or LSApplicationQueriesSchemes keys in your Info.plist. If you do, you should merge them values, but ot add a duplicate key.

Skip Step 5 (Connect Your App Delegate) and all the rest.

And that's it for iOS.

Additional Facebook app setup

Go to My App on Facebook and select your application.

Icon

You should add App Icon (in Settings -> Basic) in order to users will see your application icon instead default when they attempt to log in.

Add store IDs

In Setting -> Basic -> iOS fill up field "iPhone Store ID" ("iPad Store ID").

Optional setting

You may want to change some other settings. For example Display Name, Contact Email, Category, etc.

Enable application

By default your application has status "In development".

You should enable application before log in feature goes public.

Facebook will show warning if your application is not fully set up. For example you may need to provide Privacy Policy. You can use your Privacy Policy from Google Play/App Store.

Usage in application

You can:

  • log in via Facebook;
  • get access token;
  • get user profile;
  • check if logged in;
  • log out.

Sample code:

import 'package:flutter_login_facebook/flutter_login_facebook.dart';

// Create an instance of FacebookLogin
final fb = FacebookLogin();

// Log in
final res = await fb.logIn();

// Check result status
switch (res.status) {
  case FacebookLoginStatus.Success:
    // Logged in
    
    // Send this access token to server for validation and auth
    final accessToken = res.accessToken;

    // Get profile data
    final profile = await fb.getUserProfile();
    print('Hello, ${profile.name}! You ID: ${profile.userId}');

    break;
  case FacebookLoginStatus.Cancel:
    // User cancel log in
    break;
  case FacebookLoginStatus.Error:
    // Log in failed
    break;
}

Libraries

flutter_login_facebook