實作效果：當滑動ListView清單最底端時，動态的添加新的清單項
實作步驟：
調用ListView的setOnScrollListener()方法設定滑動監聽器，實作OnScrollListener接口的方法
判斷當清單滑動到最低端時，加載新的清單項
接口OnScrollListener
onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
view 報告滑動狀态的視圖
firstVisibleItem 可視的第一個清單項的索引
visibleItemCount 可視的清單項個數
totalItemCount 總共的清單項個數
onScrollStateChanged(AbsListView view, int scrollState)
view 報告滑動狀态的視圖
scrollState 滑動狀态
滑動狀态
SCROLL_STATE_IDLE : 0 視圖沒有滑動
SCROLL_STATE_TOUCH_SCROLL : 1 使用者正在觸摸滑動，手指仍在螢幕上
SCROLL_STATE_FLING : 2 使用者之前觸摸滑動，現在正在滑行，直到停止
示例代碼：
packagedyingbleed.iteye;
importAndroid.app.ListActivity;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.view.Gravity;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.widget.AbsListView;
importandroid.widget.BaseAdapter;
importandroid.widget.ListView;
importandroid.widget.TextView;
publicclassMainextendsListActivity {
privateListView listView;
privateMyListViewAdapter adapter;
privateintscrollState;
privateView footerView;
@Override
publicvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView = getListView();
footerView = LayoutInflater.from(this).inflate(R.layout.progress,null);
listView.addFooterView(footerView);//在ListView底部添加正在加載視圖
//注意：addFooterView方法需要在調用setListAdapter方法前調用！
adapter =newMyListViewAdapter();
setListAdapter(adapter);
getListView().setOnScrollListener(newAbsListView.OnScrollListener() {
@Override
publicvoidonScrollStateChanged(AbsListView view,intscrollState) {
Main.this.scrollState = scrollState;
}
@Override
publicvoidonScroll(AbsListView view,intfirstVisibleItem,
intvisibleItemCount,inttotalItemCount) {
intlastVisibleItem = firstVisibleItem + visibleItemCount -1;//可視的最後一個清單項的索引
if(Main.this.scrollState != AbsListView.OnScrollListener.SCROLL_STATE_IDLE
&& lastVisibleItem == totalItemCount -1) {
newThread() {
privateHandler handler =newHandler() {
@Override
publicvoidhandleMessage(Message msg) {
super.handleMessage(msg);
adapter.count +=10;
adapter.notifyDataSetChanged();
}
};
@Override
publicvoidrun() {
super.run();
try{
sleep(5000);
handler.sendEmptyMessage(0);
}catch(InterruptedException e) {
e.printStackTrace();
}
}
}.start();
}
}
});
}
privateclassMyListViewAdapterextendsBaseAdapter {
intcount =50;//初始清單項數量
@Override
publicintgetCount() {
returncount;
}
@Override
publicObject getItem(intposition) {
returnposition;
}
@Override
publiclonggetItemId(intposition) {
returnposition;
}
@Override
publicView getView(intposition, View convertView, ViewGroup parent) {
TextView result = (TextView) convertView;
if(result ==null) {
result =newTextView(Main.this);
result.setTextAppearance(Main.this, android.R.style.TextAppearance_Large);
AbsListView.LayoutParams layoutParams =newAbsListView.LayoutParams(AbsListView.LayoutParams.FILL_PARENT,
AbsListView.LayoutParams.WRAP_CONTENT);
result.setLayoutParams(layoutParams);
result.setGravity(Gravity.CENTER);
}
result.setText("Item "+(position+1));
returnresult;
}
}
}
運作結果
