ListView下拉刷新

以后会经常用到下拉刷新和上拉刷新的，今天用了，就记录一下，方便以后的使用。

下载地址：https://github.com/chrisbanes/Android-PullToRefresh

1.导包

2.xml布局：

<LinearLayout 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" >    <com.handmark.pulltorefresh.library.PullToRefreshListView        android:id="@+id/listview"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

3.Activity中：

public class MainActivity extends Activity implementsOnRefreshListener<ListView> {private MyHandler handler = new MyHandler();/** 从第三页开始显示吧 */private int current_head_index = 3;/** 后面是第三页开始 */private int current_foot_index = 4;private PullToRefreshListView mPullRefreshListView;/** 数据集合 */private ArrayList<String> data;/** 简单的适配器 */private ArrayAdapter<String> adapter;private boolean ishead = false;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.listview);data = new ArrayList<String>();addData();adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1, data);mPullRefreshListView.setOnRefreshListener(this);/** 上下都刷新 */mPullRefreshListView.setMode(Mode.BOTH);mPullRefreshListView.getLoadingLayoutProxy(false, true).setPullLabel("下拉中");mPullRefreshListView.getLoadingLayoutProxy(false, true).setRefreshingLabel("刷新中");mPullRefreshListView.getLoadingLayoutProxy(false, true).setReleaseLabel("释放了");/** 需要listView */ListView actualListView = mPullRefreshListView.getRefreshableView();actualListView.setAdapter(adapter);actualListView.setOnScrollListener(new OnScrollListener() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {// TODO Auto-generated method stub}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {// TODO Auto-generated method stub/** 如果第一条看得见 就下拉刷新 */if (firstVisibleItem == 0) {ishead = true;} else {ishead = false;}}});}private void addData() {if (current_head_index >= 1) {if (ishead) {int tempIndex = current_head_index * 10;for (int i = tempIndex; i > tempIndex - 10; i--) {data.add(0, i + "");}current_head_index--;} else {int tempIndex = current_foot_index * 10;for (int i = tempIndex - 10; i < tempIndex; i++) {data.add(i + "");}current_foot_index++;}}}@Overridepublic void onRefresh(PullToRefreshBase<ListView> refreshView) {// TODO Auto-generated method stubnew MyThread().start();}private class MyThread extends Thread {@Overridepublic void run() {// TODO Auto-generated method stubsuper.run();try {sleep(3000);/** 让主线程更新UI */Message msg = handler.obtainMessage();handler.sendMessage(msg);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}private class MyHandler extends Handler {@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubsuper.handleMessage(msg);/** 更新数据 */addData();adapter.notifyDataSetChanged();mPullRefreshListView.onRefreshComplete();}}}

记得以下几个点：

1.用一个变量来标志请求数据是上拉还是下拉（在listView的setOnScrollListener() 的监听器中来监听是下拉还是上拉，如果第一条看见了，肯定下拉，前提是第一次的条目要很多，使得第一条会滚出屏幕!!!）

2.上拉的话，数据记得加在0处，下拉就直接加在后面了

3.差点忘记了，那个ListView 是这样得到的

ListView actualListView = mPullRefreshListView.getRefreshableView();

4.记得

adapter.notifyDataSetChanged();mPullRefreshListView.onRefreshComplete();

5.明天还要做别的不知道能不能搞定呢？？

项目和支持库下载地址：
http://download.csdn.net/detail/yymonkeydo/8121035

listView代码中配置：

//滚动条的宽度istView.setScrollBarSize(3);//滚动条的背景图片为空listView.setDivider(null);//条目之间的距离listView.setDividerHeight(10);