android初学-----PullToRefresh 上拉刷新 （ListView）

public class MainActivity extends Activity {
private PullToRefreshListView mPullRefreshListView;
private LinkedList mListItems;
private ArrayAdapter<String> mAdapter;
private String[] mStrings = { "Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
"Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
"Allgauer Emmentaler", "Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
"Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
"Allgauer Emmentaler" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);
// 下拉的时候调用此方法
mPullRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() {

@Override
public void onRefresh(PullToRefreshBase<ListView> refreshView) {
// TODO Auto-generated method stub
//获取当前时间
String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(),
DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);
//设置下拉时候的刷新时间
refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);
//刷新的时候执行的异步任务  主要用于获取数据 或者加载更多内容
new GetDataTask().execute();
}
});

//上拉动的时候调用此方法
mPullRefreshListView.setOnLastItemVisibleListener(new OnLastItemVisibleListener() {
@Override
public void onLastItemVisible() {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "已经到底啦~~~", 0).show();
}

});
//从mPullRefreshListView 中 获取listView 对象
ListView actualListView = mPullRefreshListView.getRefreshableView();
//设置组装listView中的数据
mListItems = new LinkedList<String>();
mListItems.addAll(Arrays.asList(mStrings));
//设置adapter
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mListItems);
//已下2中方式设置adapter都可以
mPullRefreshListView.setAdapter(mAdapter);
//actualListView.setAdapter(mAdapter);
}

//获取数据得异步任务
private class GetDataTask extends AsyncTask<Void, Void, String[]> {

@Override
protected String[] doInBackground(Void... params) {
// Simulates a background job.
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
}
return mStrings;
}
@Override
protected void onPostExecute(String[] result) {
mListItems.addFirst("Added after refresh...");
mAdapter.notifyDataSetChanged();

// Call onRefreshComplete when the list has been refreshed.
mPullRefreshListView.onRefreshComplete();

super.onPostExecute(result);
}
}

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<com.handmark.pulltorefresh.library.PullToRefreshListView
android:id="@+id/pull_refresh_list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

</RelativeLayout>