https://developers.google.com/android/reference/com/google/android/gms/common/api/OptionalPendingResult
OptionalPendingResult | Google Play services | Google for Developers
google play servicesdevelopers
https://developers.google.com/android/reference/com/google/android/gms/common/api/OptionalPendingResult?authuser=5
OptionalPendingResult | Google Play services | Google for Developers
google play servicesdevelopers