android listView 滚动加载显示

listView.setOnScrollListener(new OnScrollListener(){

        public void onScrollStateChanged(AbsListView view, int scrollState) {
            //当不滚动时
            if(scrollState == OnScrollListener.SCROLL_STATE_IDLE){
                System.out.println(view.getLastVisiblePosition()+"==="+view.getCount());
                //判断滚动到底部
                if(view.getLastVisiblePosition()==(view.getCount()-1)){
                    //然后 经行一些业务操作
                    pd.show();
                    mt = new MyThread();
                    mt.start();
                }
            }
        }
        public void onScroll(AbsListView view, int firstVisibleItem,
                int visibleItemCount, int totalItemCount) {
            // TODO Auto-generated method stub

        }

    });