ListView滾動
1.要用到一個監聽事件是：setOnScrollListener();
API解釋是：
Set the listener that will receive notifications every time the list scrolls.
Parameters:l the scroll listener
- 2.它里面包含了兩個方法：
- 一個是：onScrollStateChanged(AbsListView view, int scrollState)，用來表明ListView是什么狀態(靜止，滑動);
- scrollState 為OnScrollListener.SCROLL_STATE_IDLE：表明ListView是在靜止狀態
- 為OnScrollListener.SCROLL_STATE_TOUCH_SCROLL：表明在滑動且手指沒有離開屏幕.
- 另外一個是：onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount)在滾動的時候獲得一些參數：
- 通過一個小例子來說明：
1 public class MainActivity extends Activity { 2 private ListView listView; 3 4 @Override 5 protected void onCreate(Bundle savedInstanceState) { 6 super.onCreate(savedInstanceState); 7 setContentView(R.layout.activity_main); 8 listView = (ListView) findViewById(R.id.lsitView); 9 List<String> list = new ArrayList<String>(); 10 for (int i = 0; i < 20; i++) { 11 list.add("這是第" + i + "個"); 12 13 } 14 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 15 android.R.layout.simple_list_item_single_choice, list); 16 listView.setAdapter(adapter); 17 listView.setOnScrollListener(new ListView.OnScrollListener() { 18 19 @Override 20 public void onScrollStateChanged(AbsListView view, int scrollState) { 21 switch (scrollState) { 22 23 case OnScrollListener.SCROLL_STATE_IDLE: // 沒有滾動的時候 24 System.out.println("最后顯示的listview的位置是--->>" 25 + listView.getLastVisiblePosition()); 26 if (listView.getLastVisiblePosition() == (listView 27 .getCount() - 1)) { 28 Toast.makeText(MainActivity.this, "滑到listView底了", 29 Toast.LENGTH_SHORT).show(); 30 31 } 32 33 if (listView.getFirstVisiblePosition() == 0) { 34 Toast.makeText(MainActivity.this, "listView頂頭了", 35 Toast.LENGTH_SHORT).show(); 36 } 37 38 break; 39 40 case OnScrollListener.SCROLL_STATE_FLING: 41 System.out.println("SCROLL_STATE_FLING"); 42 break; 43 44 case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL: 45 System.out.println("SCROLL_STATE_TOUCH_SCROLL" 46 + "能看到的最后一個顯示的位置--->>" 47 + listView.getLastVisiblePosition()); 48 break; 49 default: 50 51 break; 52 53 } 54 55 } 56 57 /** 58 * view The view whose scroll state is being reported 59 * firstVisibleItem the index of the first visible cell (ignore if 60 * visibleItemCount == 0) visibleItemCount the number of visible 61 * cells totalItemCount the number of items in the list adaptor 62 */ 63 @Override 64 public void onScroll(AbsListView view, int firstVisibleItem, 65 int visibleItemCount, int totalItemCount) { 66 67 } 68 }); 69 70 } 71 }
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