Xemplar Game Studios is a branch of Xemplar LLC, that develops video games and game engines for PC, usually coded in Java. Xemplar also has a 2nd branch called Xemplar Electronics, which has developed electronic utility applications for android.
This is the source code for the android version of the Xemplar 2D Game Engine.
This is the source code for X Pong AE. Feel free to tinker with.