I started tinkering with OpenGL on Android by reading the book OpenGL ES 2 for Android: A Quick-Start Guide written by Kevin Brothaler. It was the first major source of information on OpenGL on the Android platform that I had found. The exercise that deals with vertex buffer objects was one that I found to be particularly helpful, as my goal is to visualize as many atoms as possible on an Android device.

A link to my Github repository that has my worked examples of the exercises is:

https://github.com/jimandreas/AndroidOpenGLESLessons