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 if the user is signed in to the application for the first time or not?

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<AuthResult> completeListener = new OnCompleteListener<AuthResult>() {         @Override         public void onComplete(@NonNull Task<AuthResult> 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