Unique ID when google sign in using Firebase

Question

I have created an app that has multiple sign-in options such as email and password or with google account.

Every time a user is signing in, I save some data about it such as account creating data, nickname and so on.

I store it in my Firebase database in the following path:

Users (collection) -> auth.getuid (document with unique id) -> UserData (collection) ->some fields

So when I sign in using email and password and I use to authenticate, I can get a unique id by using auth.getid. In that way I make sure there won't be 2 same documents for different users.

Now, if I use google sign in by using the following:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RequestSignInCode){

        GoogleSignInResult googleSignInResult = Auth.GoogleSignInApi.getSignInResultFromIntent(data);

        if (googleSignInResult.isSuccess()){

            GoogleSignInAccount googleSignInAccount = googleSignInResult.getSignInAccount();
            FirebaseUserAuth(googleSignInAccount);

            FirebaseFirestore db = FirebaseFirestore.getInstance();

            Map<String, Object> user = new HashMap<>();
            user.put("username", googleSignInAccount.getEmail());
            user.put("email",googleSignInAccount.getEmail());
            user.put("dateCreated", FieldValue.serverTimestamp());

            db.collection( "Users" ).document(auth.getUid()).collection( "UserData" ).add( user );

            Intent intent = new Intent( SignInActivity.this, DiscoverActivity.class );
            startActivity(intent);
            finish();
        }

    }
}

Is there anything equivalent to auth.getuid when using google sign-in so I could create a unique document for that user?

Or even better, can I still somehow use auth.getID? because if in all of my code when I used email + password sign-in I could query by using auth.getuid, now I won't be able and will need to create a separate query based on some google.id?

Thank you

Frank van Puffelen Frank van Puffelen · Accepted Answer · 2019-11-10T21:25:32

Any Firebase Authentication user has a UID, that you can use to identify that user. It doesn't matter what provider they signed in with (email/password, google, or any other). This UID will even work when you allow the same user to sign with different providers, and you link those accounts.

Unique ID when google sign in using Firebase

1 Answers