Android backlight color

Question

I am developing a bluetooth application.

I want to change the light color to the rhythm of the music. I have a set of colors, for example 10 colors. And the choice of color to the rhythm of the music.

I have done this:

    mVisualizer = new Visualizer(0);
    mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[0]);

    Visualizer.OnDataCaptureListener captureListener = new Visualizer.OnDataCaptureListener() {
        @Override
        public void onWaveFormDataCapture(Visualizer visualizer,
                                          byte[] bytes, int samplingRate) {
            //how I can do
        }

        @Override
        public void onFftDataCapture(Visualizer visualizer, byte[] bytes,
                                     int samplingRate) {
            //how I can do
        }
    };

    mVisualizer.setDataCaptureListener(captureListener,
            Visualizer.getMaxCaptureRate() / 8, true, true);
    mVisualizer.setEnabled(true);

Now the question arises: how can I analyze byte data to get the speed (maybe int?) And select a color.

Thanks for your reply.