Android 通过FirebaseUI进行签名时，如何识别用户是否是新用户？

在使用FirebaseUI时如何使用AdditionalUserInfo.isNewUser（），或者在用户登录后是否需要对数据库进行查询。 下面是一些代码，我想从中获取这些信息-

 @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == RC_SIGN_IN) {
        IdpResponse response = IdpResponse.fromResultIntent(data);

        // Successfully signed in

        if (resultCode == RESULT_OK) {
// here i want to know if user is new???????????????????????????
            finish();
            startActivity(getIntent());
            overridePendingTransition(0, 0);
        } else {
            // Sign in failed
            if (response == null) {
                // User pressed back button
                showSnackbar(R.string.sign_in_cancelled);
                return;
            }

            if (response.getError().getErrorCode() == ErrorCodes.NO_NETWORK) {
                showSnackbar(R.string.no_internet_connection);
                return;
            }

            showSnackbar(R.string.unknown_error);
            Log.e(TAG, "Sign-in error: ", response.getError());
        }
    }

?