code: public boolean restoreAccessibilityFocus(CalendarDay day) {
          if ((day.year != mYear) || (day.month != mMonth) || (day.day > mNumCells)) {
              return false;
          }
  
          mNodeProvider.setFocusedItem(day);
          return true;
      }
docs: Attempts to restore accessibility focus to the specified date.
  
  @param day The date which should receive focus
  @return {@code false} if the date is not valid for this month view, or
  {@code true} if the date received focus