Step 0: Create a Firebase Project and put facebook credentials on their

Step 1: packages

• firebase_core:
• firebase_auth:
• google_sign_in:

Step 2: goto: android/app/build.gradle

and add these dependencies

apply plugin: 'com.google.gms.google-services'

and this also

implementation platform('com.google.firebase:firebase-bom:30.0.1')

Step 3: goto android/app/src/main/res/values/

and create a file save as > strings.xml

Step 4: Add into AndroidMainefest.xml

Step 5: Add a dependency at the project level android/build.gradle

classpath 'com.google.gms:google-services:4.3.10'

Step 6: Initialize Firebase

Don't forget to initialize firebase

like this:

void main()async{

  await Firebase.initializeApp();
runApp(YourApp());

}

Step 7: Use this Snippet to Create your Login Function

final res=await FacebookAuth.instance.login();
  final userData=await FacebookAuth.instance.getUserData();
  switch(res.status){
    case LoginStatus.success:
      {
        final AuthCredential facebookCredential = FacebookAuthProvider.credential(res.accessToken.token.toString());
        var credential  = await FirebaseAuth.instance.signInWithCredential(facebookCredential);

       print(credential.accessToken.token);




      }


  }

That's it Congratulation 🎊 you have integrated a Facebook login into your application...

**Note: don't forget to add your google_services.json in android/app/ and add your sha1 in firebase console for testing..

**

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