09-01-2012 07:05 PM
Just those tutorials link at the bottom and you will have a very clear idea for rendering texture with alpha channel except that this tutorial exemple is written in C but since OpenGL is a C based API binding in java all will be closely the same (as JAVA is Object Oriented Programming Language and C is not).
Link for Rendering Texture only:
Link for Rendering Texture with alpha channel (Transparent) :
Hope i help you Madiha.