Can I allow a user to make a custom username at the time of Registration if they use Google/Facebook sign in?

Question

I just implemented Firebase authUI in an app but I\'d like my users to be able to have usernames/display names that aren\'t their names on those accounts, without f

Answer 1

Yes you can. As @Gastón Saillén mentioned in his answer, when you first sing-in, you get the data from the registration provider but once you are signed in with Firebase, you can set a custom user name by updating the existing one using UserProfileChangeRequest.Builder.setDisplayName() method like this:

FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
UserProfileChangeRequest userProfileChangeRequest = new UserProfileChangeRequest.Builder()
        .setDisplayName("aedgar777")
        .build();

firebaseUser.updateProfile(userProfileChangeRequest).addOnCompleteListener(new OnCompleteListener() {
    @Override
    public void onComplete(@NonNull Task task) {
        if (task.isSuccessful()) {
            Log.d(TAG, "aedgar777 updated!");
        }
    }
});