Android-PullToRefresh下拉刷新库基本用法

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：

视图结构

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<String> mListItems;    private ArrayAdapter<String> 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<ListView>() {            @Override            public void onRefresh(PullToRefreshBase<ListView> 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<String>();        mListItems.addAll(Arrays.asList(mStrings));                mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mListItems);        actualListView.setAdapter(mAdapter);    }        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.            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" };}

实例源代码下载 http://download.csdn.net/detail/hantangsongming/8336075