@Override
 public void addOldData(TopicResultListBean oldValue) {
   if (oldValue != null && oldValue.getSize() > 0) {
     getItemList().addAll(oldValue.getItemList());
     setTotal_number(oldValue.getTotal_number());
   }
 }
  @Override
  public void addNewData(TopicResultListBean newValue) {
    if (newValue != null && newValue.getSize() > 0) {

      this.getItemList().clear();
      this.getItemList().addAll(newValue.getItemList());
      this.setTotal_number(newValue.getTotal_number());
    }
  }