@Override
    public boolean onTouchEvent(MotionEvent event) {
        //return super.onTouchEvent(event);
        final boolean ret = super.onTouchEvent(event);

        // send to touch drawable
        final TouchEffectDrawable d = mTouchDrawable;
        if (ret && d != null && isEnabled()) {
            d.onTouch(event);
        }

        return ret;
    }
Update the background color of the circle image view.

@param colorRes Id of a color resource.
caprice/ui/src/main/java/net/qiujuer/genius/ui/widget/FloatActionButton.java