code: @Deprecated
      public void setDayNameLength(int length) {
          if (length != LENGTH_LONG && length != LENGTH_SHORT) {
              throw new IllegalArgumentException("length parameter must be either LENGTH_LONG or LENGTH_SHORT");
          }
          this.mDayNameLength = length;
      }
docs: Set the length of the day name displayed in the header row. Example of short day names is
  'M' for 'Monday' and example of long day names is 'Mon' for 'Monday'.
  <p>
  <b>Note:</b> Use {@link #setDateTimeInterpreter(DateTimeInterpreter)} instead.
  </p>
  @param length Supported values are {@link com.alamkanak.weekview.WeekView#LENGTH_SHORT} and
  {@link com.alamkanak.weekview.WeekView#LENGTH_LONG}.