android 检测ListView滚动到的位置

ListView滚动

1.要用到一个监听事件是：setOnScrollListener();

API解释是：

Set the listener that will receive notifications every time the list scrolls.

Parameters:l the scroll listener

2.它里面包含了两个方法：

一个是：onScrollStateChanged(AbsListView view, int scrollState)，用来表明ListView是什么状态(静止，滑动);

scrollState 为OnScrollListener.SCROLL_STATE_IDLE：表明ListView是在静止状态

　　　　　 为OnScrollListener.SCROLL_STATE_TOUCH_SCROLL：表明在滑动且手指没有离开屏幕.

另外一个是：onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount)在滚动的时候获得一些参数：

通过一个小例子来说明：

 public class MainActivity extends Activity {
     private ListView listView;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         listView = (ListView) findViewById(R.id.lsitView);
         List<String> list = new ArrayList<String>();
         for (int i = 0; i < 20; i++) {
             list.add("这是第" + i + "个");

         }
         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                 android.R.layout.simple_list_item_single_choice, list);
         listView.setAdapter(adapter);
         listView.setOnScrollListener(new ListView.OnScrollListener() {

             @Override
             public void onScrollStateChanged(AbsListView view, int scrollState) {
                 switch (scrollState) {

                 case OnScrollListener.SCROLL_STATE_IDLE: // 没有滚动的时候
                     System.out.println("最后显示的listview的位置是--->>"
                             + listView.getLastVisiblePosition());
                     if (listView.getLastVisiblePosition() == (listView
                             .getCount() - 1)) {
                         Toast.makeText(MainActivity.this, "滑到listView底了",
                                 Toast.LENGTH_SHORT).show();

                     }

                     if (listView.getFirstVisiblePosition() == 0) {
                         Toast.makeText(MainActivity.this, "listView顶头了",
                                 Toast.LENGTH_SHORT).show();
                     }

                     break;

                 case OnScrollListener.SCROLL_STATE_FLING:
                     System.out.println("SCROLL_STATE_FLING");
                     break;

                 case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
                     System.out.println("SCROLL_STATE_TOUCH_SCROLL"
                             + "能看到的最后一个显示的位置--->>"
                             + listView.getLastVisiblePosition());
                     break;
                 default:

                     break;

                 }

             }

             /**
              * view The view whose scroll state is being reported
              * firstVisibleItem the index of the first visible cell (ignore if
              * visibleItemCount == 0) visibleItemCount the number of visible
              * cells totalItemCount the number of items in the list adaptor
              */
             @Override
             public void onScroll(AbsListView view, int firstVisibleItem,
                     int visibleItemCount, int totalItemCount) {

             }
         });

     }
 }

源码下载地址：
源码