@Override
 public void showInExpandableListView(List<Group> group, List<List<User>> user) {
   if (adapter == null) {
     mGroup = group;
     mUser = user;
     adapter = new UserContactsAdapter(this, mGroup, mUser);
     ptrexlistview.getRefreshableView().setAdapter(adapter);
   } else {
     mGroup.addAll(group);
     mUser.addAll(user);
     adapter.notifyDataSetChanged();
   }
   String label =
       DateUtils.formatDateTime(
           getApplicationContext(),
           System.currentTimeMillis(),
           DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);
   startLabels.setLastUpdatedLabel("最后更新时间:" + label);
   lastUpdateTime = label;
 }
  private void initView() {
    ptrexlistview = (PullToRefreshExpandableListView) findViewById(R.id.ptrex);
    startLabels = ptrexlistview.getLoadingLayoutProxy();
    ptrexlistview.setMode(Mode.PULL_FROM_START);
    /** 添加头部控件 */
    View header = getLayoutInflater().inflate(R.layout.headerview, ptrexlistview, false);
    AbsListView.LayoutParams params =
        new AbsListView.LayoutParams(
            AbsListView.LayoutParams.MATCH_PARENT, AbsListView.LayoutParams.WRAP_CONTENT);
    header.setLayoutParams(params);
    ptrexlistview.getRefreshableView().addHeaderView(header);

    Button button = (Button) header.findViewById(R.id.header_bt);
    button.setOnClickListener(
        new OnClickListener() {

          @Override
          public void onClick(View v) {
            Toast.makeText(PullToRefreshExpandableListViewActivity.this, "header is clicked", 0)
                .show();
          }
        });
    View footer = getLayoutInflater().inflate(R.layout.footerview, ptrexlistview, false);
    params =
        new AbsListView.LayoutParams(
            AbsListView.LayoutParams.MATCH_PARENT, AbsListView.LayoutParams.WRAP_CONTENT);
    footer.setLayoutParams(params);
    ptrexlistview.getRefreshableView().addFooterView(footer);

    // 取消系统指示箭头
    ptrexlistview.getRefreshableView().setGroupIndicator(null);
    ptrexlistview.getRefreshableView().setVerticalScrollBarEnabled(true);
    ptrexlistview.getRefreshableView().setScrollBarFadeDuration(500);
    ptrexlistview.setOnRefreshListener(
        new OnRefreshListener<ExpandableListView>() {

          @Override
          public void onRefresh(PullToRefreshBase<ExpandableListView> refreshView) {
            // startLabels.setLastUpdatedLabel(label);
            // startLabels.setRefreshingLabel("加载成功");
            startLabels.setPullLabel("下拉刷新..."); // 刚下拉时,显示的提示
            startLabels.setRefreshingLabel("正在载入..."); // 刷新时
            startLabels.setReleaseLabel("放开刷新..."); // 下来达到一定距离时,显示的提示
            startLabels.setLastUpdatedLabel("上次刷新时间:" + lastUpdateTime);
            userPresenter.getUserInfo();
          }
        });
    // ptrexlistview.setOnRefreshListener(new OnRefreshListener2<ExpandableListView>() {
    //
    // @Override
    // public void onPullDownToRefresh(PullToRefreshBase<ExpandableListView> refreshView) {
    // ILoadingLayout startLabels = ptrexlistview.getLoadingLayoutProxy(true, false);
    // startLabels.setPullLabel("下拉刷新...");// 刚下拉时,显示的提示
    // startLabels.setRefreshingLabel("正在载入...");// 刷新时
    // startLabels.setReleaseLabel("放开刷新...");// 下来达到一定距离时,显示的提示
    // userPresenter.getUserInfo();
    // }
    //
    // @Override
    // public void onPullUpToRefresh(PullToRefreshBase<ExpandableListView> refreshView) {
    // ILoadingLayout endLabels = ptrexlistview.getLoadingLayoutProxy(false, true);
    // endLabels.setPullLabel("上拉刷新...");// 刚下拉时,显示的提示
    // endLabels.setRefreshingLabel("正在载入...");// 刷新时
    // endLabels.setReleaseLabel("放开刷新...");// 下来达到一定距离时,显示的提示
    // userPresenter.getUserInfo();
    //
    // }
    //
    // });
  }