Android ExpandableListView实现下拉刷新和加载更多效果

<com.xingyi.elonggradletaskdemo.widget.SExpandableListView
    android:listSelector="@android:color/transparent"
    android:id="@+id/elv_coupon"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:dividerHeight="1dp">

  </com.xingyi.elonggradletaskdemo.widget.SExpandableListView>

expandableListView = (SExpandableListView)     
    findViewById(R.id.elv_coupon);
    // 在设置适配器之前设置是否支持下拉刷新
    expandableListView.setLoadingMoreEnabled(true);
    expandableListView.setPullRefreshEnabled(true);
    expandableListView.setAdapter(couponAdapter);

expandableListView.setmLoadingListener(new SExpandableListView.LoadingListener() {
      @Override
      public void onLoadMore() {
        // 模拟加载更多
        isPull = false;
        // 这里应该在项目中请求,这里用延时模拟接口请求
        loadCount++;
        Message msg = handler.obtainMessage();
        msg.arg1 = loadCount;
        handler.sendMessageDelayed(msg, 2000);
        Log.e("TAG---HANDLER:", loadCount + "-->");
      }

      @Override
      public void onRefresh() {
        isPull = true;
        loadCount++;
        // 模拟接口请求下拉刷新
        Message msg = handler.obtainMessage();
        msg.arg1 = loadCount;
        handler.sendMessageDelayed(msg, 2000);
        Log.e("TAG---HANDLER:", loadCount + "-->");
      }
    });



   private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      // 模拟接口回复数据,加入下拉刷新次数为6次的话我们就认为没有更多了
      if (loadCount > 6) {
        expandableListView.refreshComplete();
        expandableListView.setNoMore(true);
      } else {
        addLoadMoreData();
        if (isPull) {
          expandableListView.refreshComplete();
        }
        couponAdapter.notifyDataSetChanged();
        // 是不是全部展开,根据需求设置
//        expanedAll();
      }
      Log.e("TAG---收到消息:", loadCount + "-->");

    }
  };

// 这里在自定view构造函数中调用的增加header和footer的代码,注意下两种添加方式的区别,详情见注释和源代码
 private void initSE(Context context) {
    /**
     * 这里是footer的填充,注意指定他的父亲为当前的listview,
     * 这里footer不用指定layoutparem是因为footer 在填充的时候已经指定了他的父view
     */
    loadMoreView = LayoutInflater.from(context).inflate(R.layout.item_footer_view, this, false);
    loadMorePb = (ProgressBar) loadMoreView.findViewById(R.id.pb_loading);
    loadMoreDesc = (TextView) loadMoreView.findViewById(R.id.tv_loadmore_desc);
  }

  @Override
  public void setAdapter(ExpandableListAdapter adapter) {
    if (pullRefreshEnabled) {
      mRefreshHeader = new ArrowRefreshHeader(getContext());
      mRefreshHeader.setProgressStyle(ProgressStyle.LineScale);
      /**
       * 注意一定要指定header的layoutparasm为 AbsListView,以为 header是 new出来的他默认的 layoutparm是当前header的类型,
       * 如果我们不修改的话会报错 类型转化异常,
       */
      mRefreshHeader.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, AbsListView.LayoutParams.WRAP_CONTENT));
      addHeaderView(mRefreshHeader);
    }
    if (loadingMoreEnabled) {
      addFooterView(loadMoreView);
    }
    super.setAdapter(adapter);
  }