Hi there! 
I would like to make something like a “pull request”. So, I develop my game in android and need some native funcionality like GPS, sensors, views etc. Recently I encounter a problem with adding some views above Cocos2dxSurfaceView and making it transparent. I solved it by replacing glSurfaceView with TextureView. It work just like glSurfaceView but it is a normal view too. It allowed me for easier transparency and adding some views above it without loosing performance. If some one is interested in topic - google it or ask (I’m open for questions 
) . Sorry for my bad english. 
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I met the same problem, hope to get your help, you still there?