@Override
    protected void onProgressChanged(int scale, boolean fromUser) {
        super.onProgressChanged(scale, fromUser);

        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onProgressChanged(this, scale, fromUser);
        }
    }
Sets a listener to receive notifications of changes to the SeekBar's progress level. Also
provides notifications of when the user starts and stops a touch gesture within the SeekBar.
And provides notifications of when the AbsSeekBar shows/hides the bubble indicator.

@param l The seek bar notification listener
@see OnSeekBarChangeListener
caprice/ui/src/main/java/net/qiujuer/genius/ui/widget/SeekBar.java