code: public void setFocusedItem(T item) {
          final int itemId = getIdForItem(item);
          if (itemId == INVALID_ID) {
              return;
          }
  
          performAction(itemId, AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS, null);
      }
docs: Requests accessibility focus be placed on the specified item.
  
  @param item The item to place focus on.