PullToRefresh

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

[html] view
plain copy







<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

[java] view
plain copy







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

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