// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
    if (requestCode == SIGNIN_CODE) {
        val task = GoogleSignIn.getSignedInAccountFromIntent(data)
        try {
            // Google Sign In was successful, authenticate with Firebase
            val account = task.getResult(ApiException::class.java)!!
            Log.d(TAG, "firebaseAuthWithGoogle:"   account.id)
            firebaseAuthWithGoogle(account.idToken!!)
        } catch (e: ApiException) {
            // Google Sign In failed, update UI appropriately
            Log.w(TAG, "Google sign in failed", e)
        }
    }
}

private fun firebaseAuthWithGoogle(idToken: String) {
    val credential = GoogleAuthProvider.getCredential(idToken, null)
    auth.signInWithCredential(credential)
        .addOnCompleteListener(this) { task ->
            if (task.isSuccessful) {
                // Sign in success, update UI with the signed-in user's information
                Log.d(TAG, "signInWithCredential:success")
                val user = auth.currentUser
                Toast.makeText(this, "Login Successfull", Toast.LENGTH_SHORT).show()
            } else {
                // If sign in fails, display a message to the user.
                Log.w(TAG, "signInWithCredential:failure", task.exception)
                Toast.makeText(this, "Login Failed", Toast.LENGTH_SHORT).show()
            }
        }
}