public T setTextColorRes(@ColorRes final int colorResId) {
        textColor = ContextCompat.getColor(getContext(), colorResId);
        if(indicator != null) {
            indicator.setTextColor(textColor);
        }
        return (T)this;
    }
Provides the ability to programmatically set the text color of the indicator. Will do nothing if there is no section indicator.
@param colorResId to set the text of the indicator.
lib/src/main/java/com/turingtechnologies/materialscrollbar/MaterialScrollBar.java