AuthenticatorActivity.kt

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)

        when (requestCode) {
            GOOGLE_SIGN_IN -> {
                val task = GoogleSignIn.getSignedInAccountFromIntent(data)
                try {
                    val account = task.getResult(ApiException::class.java)
                    Log.d(TAG, "Authenticated with Google: token = ${account.idToken}")
                    model.federateWithGoogle(account)
                    [email protected]()
                } catch (error: ApiException) {
                    toast("Google Authentication failed: ${error.message}")
                }
            }

            else -> {
                callbackManager.onActivityResult(requestCode, resultCode, data)
            }
        }
    }