Simple opengl example for iphone and android?

Question

Android

Hello. And tell me please - no one has met a simple project template on opengl on the open spaces of the network, which would be possible to run on both android and iphone? So that there was an example of highlighting platform-dependent things and separately platform-independent code? It is reluctant to get involved with cross-platform engines, because the task is small, and I would like to figure it out myself. Although, as an option, you can “peep” how this is implemented in the engine.