Question

Are glGetUniformLocation and glGetAttribLocation time consuming?

Which way is better?

1. Call glGetAttribLocation or glGetUniformLocation every time I need it ?
2. Store locations in varables and use them when needed ?

Answer 1

Whether on Android or iPhone, for an opengl surface you will have methods like:
onSurfaceCreated and onSurfaceChanged,
get into the habit of fetching uniforms and attributes here in these 2 methods.

The only way you can make rendering faster (which will soon become your priority when your code crosses 1000 lines of code) is by only having gluseprogram, glbindbuffer, texture binds and other binds inside onDrawFrame method, always cache variables inside onSurfaceCreated and onSurfaceChanged