OnScrollListener回调分析

new AbsListView.OnScrollListener() {
   
   @Override
   public void onScrollStateChanged(AbsListView view, int scrollState) {
    switch (scrollState) {
    　　case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
             // 手指触屏拉动准备滚动，只触发一次
             Log.i("scroll", "SCROLL_STATE_TOUCH_SCROLL");
          break;
    　　case AbsListView.OnScrollListener.SCROLL_STATE_FLING:
    　　   // 手指做了抛的动作(手指离开屏幕前，用力滑了一下)，只触发一次
             Log.i("scroll", "SCROLL_STATE_FLING");
     　  break;
          case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:
             // 整个滚动事件结束，只触发一次
             Log.i("scroll", "SCROLL_STATE_IDLE");             
          break;
         default:
         break;
        }
   }

   @Override
   public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
     int totalItemCount) {// 一直在滚动中，多次触发  
       //滚动时一直回调，直到停止滚动时才停止回调。单击时回调一次。    
       //firstVisibleItem：当前能看见的第一个列表项ID（从0开始）    
       //visibleItemCount：当前能看见的列表项个数（小半个也算）    
       //totalItemCount：列表项共数       
       boolean isLastRow = false;
       //判断是否滚到最后一行    
       if (firstVisibleItem + visibleItemCount == totalItemCount && totalItemCount > 0) {    
            isLastRow = true;    
      }    

        Log.i("scroll", "onScroll  "+"firstVisibleItem:"+firstVisibleItem+
        ";visibleItemCount:"+visibleItemCount+";totalItemCount"+totalItemCount+
        ";isLastRow:"+isLastRow); 
      }
  });