code: public boolean lastChild() {
          if (mNode == null || mNode.getChildCount() < 1) {
              return false;
          }
          for (int i = mNode.getChildCount() - 1; i >= 0; --i) {
              AccessibilityNodeInfoCompat newNode = mNode.getChild(i);
              if (newNode == null) {
                  return false;
              }
              if (AccessibilityNodeInfoUtils.isVisibleOrLegacy(newNode)) {
                  reset(newNode);
                  return true;
              }
              newNode.recycle();
          }
          return false;
      }
docs: Traverses to the last child of this node, returning {@code true}
  on success.