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

According to the new version of Firebase auth (16.0.1) The AuthResult class has a member function which results true or false (is the user is new). Assuming "credential" is defined in the scope(it is the google credential ). An example is shown below: `

private FirebaseAuth mAuth;

GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestIdToken(getString(R.string.default_web_client_id))
            .requestEmail()
            .build();

mAuth = FirebaseAuth.getInstance();
Task task = GoogleSignIn.getSignedInAccountFromIntent(data);
GoogleSignInAccount acct = task.getResult(ApiException.class);
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);

mAuth.signInWithCredential(credential)
            .addOnCompleteListener(this, new OnCompleteListener() {
                @Override
                public void onComplete(@NonNull Task task) {
                    if (task.isSuccessful()) {
                        Log.d(TAG, "linkWithCredential:success");


                        boolean newuser = task.getResult().getAdditionalUserInfo().isNewUser();



                        if(newuser){

                             //Do Stuffs for new user

                         }else{

                            //Continue with Sign up 
                        }

                    } else {

                        Toast.makeText(MyClass.this, "Authentication failed.",
                                Toast.LENGTH_SHORT).show();

                    }


            });

Thanks to firebase:)