Version: 6.2.0

Android configuration

IMPORTANT

Upon installation of this plugin, configuration is needed on Android before running the project again. If this is not done, an error of No implementation found would show because the Facebook SDK on Android would throw an Exception error if the configuration is not yet defined. This error also locks the other plugins in your project, so if the plugin is not yet needed, either remove it or comment it out from the pubspec.yaml file.

IMPORTANT

Since the native facebook sdk 15.0.0 the minSdkVersion required is 21. You must go to android/app/build.gradle and define minSdkVersion to 21

    defaultConfig {
        ...
        minSdkVersion 21
        targetSdkVersion 33
        ...
    }

Go to Facebook Login for Android - Quickstart

Select an App or Create a New App

Skip the step 2 (Download the Facebook App)
Skip the step 3 (Integrate the Facebook SDK)

Edit Your Resources and Manifest add this config in your android project

Open your /android/app/src/main/res/values/strings.xml file, or create one if it doesn't exists.

Add the following (replace {your-app-id} with your facebook app Id) and with your client token:

    <string name="facebook_app_id">{your-app-id}</string>
    <string name="facebook_client_token">YOUR_CLIENT_TOKEN</string>

Here one example of strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="facebook_app_id">1365719610250300</string>
    <string name="facebook_client_token">YOUR_CLIENT_TOKEN</string>
</resources>

You can find the client token in your facebook developers console

Open the /android/app/src/main/AndroidManifest.xml file.
Add the following uses-permission element before the application element
```
<uses-permission android:name="android.permission.INTERNET"/>
```

Add the following meta-data element, an activity for Facebook, and an activity and intent filter for Chrome Custom Tabs inside your application element

<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>
<meta-data android:name="com.facebook.sdk.ClientToken" android:value="@string/facebook_client_token"/>

Here one example of AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="app.meedu.flutter_facebook_auth_example">
    <uses-permission android:name="android.permission.INTERNET" />
    <application
       android:name="${applicationName}"
       android:icon="@mipmap/ic_launcher"
       android:label="facebook auth">

       <meta-data
           android:name="com.facebook.sdk.ApplicationId"
           android:value="@string/facebook_app_id" />
       <meta-data 
           android:name="com.facebook.sdk.ClientToken" 
           android:value="@string/facebook_client_token"/>

        <activity
           android:name=".MainActivity"
           android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
           android:hardwareAccelerated="true"
           android:launchMode="singleTop"
           android:theme="@style/LaunchTheme"
           android:exported="true"
           android:windowSoftInputMode="adjustResize">
           <meta-data
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme" />
           <meta-data
               android:name="io.flutter.embedding.android.SplashScreenDrawable"
               android:resource="@drawable/launch_background" />
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>
       <meta-data
           android:name="flutterEmbedding"
           android:value="2" />
    </application>
</manifest>

Associate Your Package Name and Default Class with Your App
1. Provide the Development and Release Key Hashes for Your App
To find info to how to generate you key hash go to https://developers.facebook.com/docs/facebook-login/android?locale=en_US#6--provide-the-development-and-release-key-hashes-for-your-app
Note: if your application uses Google Play App Signing then you should get certificate SHA-1 fingerprint from Google Play Console and convert it to base64
You should add key hashes for every build variants like release, debug, CI/CD, etc.

Queries Apps that target Android API 30+ (Android 11+) cannot call Facebook native apps unless the package visibility needs are declared. Please follow https://developers.facebook.com/docs/android/troubleshooting/#faq_267321845055988 to make the declaration. To solve it you have to add in the AndroidManifest.xml file:

<manifest package="com.example.app">
    <queries>
        <provider android:authorities="com.facebook.katana.provider.PlatformProvider" />
    </queries>
    ...
</manifest>

(Optional) To opt out of the Advertising ID Permission, add a uses-permission element to the manifest after the application element

<uses-permission android:name="com.google.android.gms.permission.AD_ID" tools:node="remove"/>

KEEP IN MIND

If your app is still in developing mode in your facebook console to test the login flow you only can use test accounts or use the facebook account which is the owner of the app in the facebook developer console.
If want to test the login flow with the native facebook app and your app is in developing mode your account must be added to the developer team https://developers.facebook.com/docs/development/build-and-test/app-roles
If you want to get the user email and public profile you must check in your facebook developers console that you have that permissions enabled.

Starting with Android 11 the facebook ClientToken is mandatory (check the above example).
Facebook app to perform the login request when it is installed. The native Facebook app compare your app signing(key hash) with the key hash registered in your Facebook developers console. If the login flow doesn't works with the Facebook app that means that you have problems with your hash. Make sure that you have added the correct key hashes in your console.
If you get error like this: Missing 'package' key attribute on element package at ...
This issue happens for the combination of:
```
Using Android-SDK's API level 31 (or later),
With old Gradle version(s).
```
Check your com.android.tools.build:gradle version in android/build.gradle. It's should be 3.5.4 or higher.