ListView(3)关于listview滚动事件，何时滚动到顶部或底部

给listview设置一个OnScrollListener就可

     ListView.OnScrollListener scrollListener = new ListView.OnScrollListener() {
         @Override
         public void onScrollStateChanged(AbsListView view, int scrollState) {
             switch (scrollState) {
             case OnScrollListener.SCROLL_STATE_IDLE:
                 System.out.println("刷新完毕 ");
                 pullRV.endPulling();
                 break;
             case OnScrollListener.SCROLL_STATE_FLING:
                 System.out.println("挑划产生刷新");
                 break;
             case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
                 System.out.println("拖动产生刷新 ");
                 View cld = listview.getChildAt();
                 if (cld.getTop() ==  ) {
                 }
                 break;
             default:break;
             }
         }
         @Override
         public void onScroll(AbsListView view, int firstVisibleItem,
                 int visibleItemCount, int totalItemCount) {
             System.out.println(String.format("first = %d,count = %d,total = %d", firstVisibleItem,visibleItemCount,totalItemCount));
             if (firstVisibleItem == ) {
                 System.out.println("onScroll滑到顶部");
             }
             if (firstVisibleItem + visibleItemCount == totalItemCount) {
                 System.out.println("onScroll滑到底部");
             }
         }
     };
     listview.setOnScrollListener(scrollListener);