code: private CalendarDay findAccessibilityFocus() {
          final int childCount = getChildCount();
          for (int i = 0; i < childCount; i++) {
              final View child = getChildAt(i);
              if (child instanceof SimpleMonthView) {
                  final CalendarDay focus = ((SimpleMonthView) child).getAccessibilityFocus();
                  if (focus != null) {
                      // Clear focus to avoid ListView bug in Jelly Bean MR1.
                      ((SimpleMonthView) child).clearAccessibilityFocus();
                      return focus;
                  }
              }
          }
  
          return null;
      }
docs: Attempts to return the date that has accessibility focus.
  
  @return The date that has accessibility focus, or {@code null} if no date
  has focus.