public T setBarColorRes(@ColorRes final int colorResId) {
        handleTrack.setBackgroundColor(ContextCompat.getColor(getContext(), colorResId));
        return (T)this;
    }
Provides the ability to programmatically set the color of the scrollbar.
@param colorResId to set the bar.
lib/src/main/java/com/turingtechnologies/materialscrollbar/MaterialScrollBar.java