Check if user is authenticated for the first time in Firebase Google Authentication in Android

Question

I am using Firebase Authentication in an Android application, and I am using Google account authentication as an option to sign in to the application.

How can I know

Answer 1

To check if it's the first time user logs in, simply call the AdditionalUserInfo.isNewUser() method in the OnCompleteListener.onComplete callback.

Example code below, be sure to check for null.

OnCompleteListener completeListener = new OnCompleteListener() {
        @Override
        public void onComplete(@NonNull Task task) {
            if (task.isSuccessful()) {
                boolean isNew = task.getResult().getAdditionalUserInfo().isNewUser();
                Log.d("MyTAG", "onComplete: " + (isNew ? "new user" : "old user"));
            }
        }
    };

Check the docs for more reference AdditionalUserInfo