.Net程序员玩转Android开发---(15)ListView滚动事件

Android中的ListView 可以上下滑动，并且上下活动可以分页加载数据，这一节我们看下ListView的滚动事件.

ListView的滚动事件主要通过setOnScrollListener监听器来实现,主要包括两个方法onScroll和onScrollStateChanged方法，onScrollStateChanged主要用来监听滚动状态

在滑动过程中向ListView添加数据 ，ListView滚动的时候主要有三个状态，SCROLL_STATE_TOUCH_SCROLL   ，SCROLL_STATE_FLING，SCROLL_STATE_IDLE

 lv.setOnItemClickListener(new OnItemClickListener() {
		            @Override
		            public void onItemClick(AdapterView<?> arg0,View arg1, int arg2,
		                    long arg3) {   

		            	TextView   tname= (TextView)arg1.findViewById(R.id.tvname);//名称
		            	TextView   tmodel= (TextView)arg1.findViewById(R.id.tvmodel);//规格
		            	TextView   tprice= (TextView)arg1.findViewById(R.id.tvprice);//单价
		            	TextView   tcode= (TextView)arg1.findViewById(R.id.tvcode);//编码

		                Toast.makeText(getApplicationContext(),"当前商品 名称:"+tname.getText()+",编码:"+tcode.getText(),30).show();  

		            }
		        });  

		      lv.setOnScrollListener(new OnScrollListener(){

				@Override
				public void onScroll(AbsListView arg0, int arg1, int arg2,
						int arg3) {
					// TODO Auto-generated method stub

				}

				@Override
				public void onScrollStateChanged(AbsListView arg0, int arg1) {
					// TODO Auto-generated method stub 滚动状态监听器
					if(arg1==AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL)
					{
						//手指没有离开屏幕，正在滑动
						Toast.makeText(getApplicationContext(),"手指没有离开屏幕，正在滑动",30).show(); 

						Map<String,Object> map=new HashMap<String,Object>();
			    		map.put("code","编码:10");
			    		map.put("name","名称:Ipad");
			    		map.put("price","价格:22");
			    		map.put("model","单位:22");
			    		mapList.add(map);
			    		//adp.notifyDataSetChanged();
			    		SimpleAdapter sAdapter = (SimpleAdapter)lv.getAdapter();
			            sAdapter.notifyDataSetChanged();   

					}
					else if(arg1==AbsListView.OnScrollListener.SCROLL_STATE_FLING)
					{
						//手指离开屏幕之前，用力滑动了一下
						Toast.makeText(getApplicationContext(),"手指离开屏幕之前，用力滑动了一下",30).show();
					}
					else if(arg1==AbsListView.OnScrollListener.SCROLL_STATE_IDLE)
					{
						 //停止滑动
						Toast.makeText(getApplicationContext(),"停止滑动",30).show();
					}

				}

		      });