pullToRefresh的自动刷新，到底自动加载等等问题

进入页面时自己刷新数据：//自动刷新

        new Handler().postDelayed(new Runnable() {
            public void run() {
                ptrl.setRefreshing();
                new NewsAsyT(act, mnews, fad, ptrl, cache).execute(path + page);
            }
        }, 500);

//

     设置刷新监听
    ptrl.setOnRefreshListener(listener);

    只下拉刷新
    OnRefreshListener listener = new OnRefreshListener() {
    @Override
    public void onRefresh(PullToRefreshBase refreshView) {
         //下拉刷新


    ptrl.setOnLastItemVisibleListener(this);
    public void onLastItemVisible() {
     //到底自动加载