public void setHeaderColumnPadding(int headerColumnPadding) {
        mHeaderColumnPadding = headerColumnPadding;
        invalidate();
    }
Set the first day of the week. First day of the week is used only when the week view is first
drawn. It does not of any effect after user starts scrolling horizontally.
<p>
    <b>Note:</b> This method will only work if the week view is set to display more than 6 days at
    once.
</p>
@param firstDayOfWeek The supported values are {@link java.util.Calendar#SUNDAY},
{@link java.util.Calendar#MONDAY}, {@link java.util.Calendar#TUESDAY},
{@link java.util.Calendar#WEDNESDAY}, {@link java.util.Calendar#THURSDAY},
{@link java.util.Calendar#FRIDAY}.
library/src/main/java/com/alamkanak/weekview/WeekView.java