How to code opengl in android similar to computer graphics ?

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Java

OpenGL

Android

I know to code opengl in computer in c/c++ program.as it on my engg semister lab.
but i want to code opengl on android to some stuff.i surfed a lot on internet.
but almost all are explaining same triangle example.in computer graphics
we use functions like glBegin(...) ,glEnd(),glColor3f(...),glFlush()....
but iam unable to understand glEnableClientState()...and the surfaceview,Renderer classes.
so anybody explain me to learn with similar to opengl in computer graphics.

What I have tried:

I have tried opengl in Computer graphics.