I've searched a lot about taking screenshot of my OpenGL object on Android and come up with [this](https://stackoverflow.com/questions/3310990/taking-screenshot-of-android-opengl/4666820#4666820) solution. It worked great but in my case I have camera view and opengl view(with transparent background) on top of camera view. So what I want to do is to get opengl screenshot with transparent background instead of black. 
As I said I have tried link above and it worked but I'm stuck with black background. It's little bit complicated to figure out how to get rid of the black background in this particular case. 
Hope somebody could help me and asap if it's possible(also I think the solution is easy, I'm just missing something simple).
Thank you.