https://developers.google.com/games/services/cpp/api/structgpg_1_1AndroidSupport
For apps which target android 4.0+ (API Version greater than or equal to 14), most of these function calls are unnecessary. For such apps only the OnActivityResult function must be called.
[工作积累] Google Play Game SDK details
原文：http://www.cnblogs.com/crazii/p/4214115.html