Android GLSurfaceView transparent

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GLSurfaceView set at initialization

        setEGLConfigChooser(8, 8, 8, 8, 16, 0);
        getHolder().setFormat(PixelFormat.TRANSLUCENT);
        setZOrderOnTop(true);
        setRenderer(mRenderer);

onDrawFrame transfer glClearColor

        @Override
        public void onDrawFrame(GL10 gl10) {
            GLES20.glClearColor(0,0,0,0);
        }