surfaceview 透明

 SurfaceView sfvTrack = (SurfaceView)findViewById(R.id.sfvTrack);
sfvTrack.setZOrderOnTop(true); // 这句不能少
sfhTrack = sfvTrack.getHolder();
sfhTrack.setFormat(PixelFormat.TRANSPARENT);

http://topic.csdn.net/u/20110411/19/8dcc2430-78f7-4321-81b1-7d1b2f6c4125.html

setZOrderOnTop放到顶层

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