chrisbanes/Android-PullToRefresh ListView的下拉刷新

转载：http://blog.csdn.net/hantangsongming/article/details/42490277

PullToRefresh是一套实现非常好的下拉刷新库，它支持：

ListView
ExpandableListView
GridView
WebView
ScrollView
HorizontalScrollView
ViewPager
等多种常用的需要刷新的View类型，而且使用起来也十分方便。
（下载地址： https://github.com/chrisbanes/Android-PullToRefresh ）

PullToRefresh基本用法：
1、在布局文件中添加PullToRefresh控件，比如PullToRefreshListView；
2、在Activity中，设置监听器OnRefreshListener以响应用户下拉操作；
3、在监听器的onRefresh()方法中执行数据刷新操作，可以通过AsyncTask来实现；
4、在AsyncTask中获取到数据后，记得调用onRefreshComplete()方法通知PullToRefresh控件数据已获取完毕，可以结束刷新操作。

实例：PullToRefreshDemo
运行效果：

代码清单：
布局文件：activity_main.xml

 <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_to_refresh_listview"
         android:layout_height="fill_parent"
         android:layout_width="fill_parent" />

 RelativeLayout>

Java源代码文件：MainActivity.java

 package com.rainsong.pulltorefreshdemo;

 import java.util.Arrays;
 import java.util.LinkedList;

 import android.app.Activity;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.text.format.DateUtils;
 import android.view.Menu;
 import android.widget.ArrayAdapter;
 import android.widget.ListView;

 import com.handmark.pulltorefresh.library.PullToRefreshBase;
 import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
 import com.handmark.pulltorefresh.library.PullToRefreshListView;

 public class MainActivity extends Activity {
     private PullToRefreshListView mPullToRefreshListView;
     private LinkedList mListItems;
     private ArrayAdapter mAdapter;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         // Set a listener to be invoked when the list should be refreshed.
         mPullToRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_to_refresh_listview);
         mPullToRefreshListView.setOnRefreshListener(new OnRefreshListener() {
             @Override
             public void onRefresh(PullToRefreshBase refreshView) {
                 String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(),
                         DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);

                 // Update the LastUpdatedLabel
                 refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);

                 // Do work to refresh the list here.
                 new GetDataTask().execute();
             }
         });

         ListView actualListView = mPullToRefreshListView.getRefreshableView();

         mListItems = new LinkedList();
         mListItems.addAll(Arrays.asList(mStrings));

         mAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, mListItems);
         actualListView.setAdapter(mAdapter);
     }

     private class GetDataTask extends AsyncTask {

         @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.
             mPullToRefreshListView.onRefreshComplete();
             super.onPostExecute(result);
         }
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

     private String[] mStrings = { "John", "Michelle", "Amy", "Kim", "Mary",
             "David", "Sunny", "James", "Maria", "Michael", "Sarah", "Robert",
             "Lily", "William", "Jessica", "Paul", "Crystal", "Peter",
             "Jennifer", "George", "Rachel", "Thomas", "Lisa", "Daniel", "Elizabeth",
             "Kevin" };
 }

简单来讲，使用步骤：

1.初始化容器控件
 mPullToRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_to_refresh_listview);

2.容器设置刷新监听,在里面进行：时间的刷新，列表的刷新
 mPullToRefreshListView.setOnRefreshListener()
 
3.找到容器维护的listView,并且设置适配器
 ListView actualListView = mPullToRefreshListView.getRefreshableView();
 actualListView.setAdapter(mAdapter);
 
4.记得刷新完毕要通知一下
mPullToRefreshListView.onRefreshComplete();