照著老師的代碼寫，下拉后會增加下拉項，但是僅增加一個，并沒有無限增加，不清楚是什么原因。。謝謝。

??@Override
????public?void?onScrollStateChanged(AbsListView?view,?int?scrollState)?{
????????switch?(scrollState){
????????????case?SCROLL_STATE_FLING:
????????????????Log.i("Main",?"用戶手指離開屏幕之前，由于用力滑了一下，視圖仍由于慣性繼續滑動");
????????????????Map<String,Object>map?=?new?HashMap<String,?Object>();
????????????????map.put("pic",?R.mipmap.ic_launcher);
????????????????map.put("text",?"additional?item");
????????????????dataList.add(map);
????????????????simpleAdapter.notifyDataSetChanged();//notify?UI?thread?to?refresh?the?UI
????????????????break;
????????????case?SCROLL_STATE_IDLE:
????????????????Log.i("Main",?"視圖已經停止滑動");
????????????????break;
????????????case?SCROLL_STATE_TOUCH_SCROLL:
????????????????Log.i("Main",?"手指沒有離開屏幕，視圖正在滑動");
????????????????break;
????????}
????}