code: public BoxRequestsFolder.GetFolderItems getItemsRequest(String id) {
          BoxRequestsFolder.GetFolderItems request = new BoxRequestsFolder.GetFolderItems(id, getFolderItemsUrl(id), mSession);
          return request;
      }
docs: Gets a request that retrieves the items of a folder
  
  @param id    id of folder to get children on
  @return      request to get a folders children