XML解析（RSS阅读器）ListActivity实现

程序里解析的是网易的RSS：http://news.163.com/special/00011K6L/rss_newstop.xml

仍然记住要在Manifest里面注册Internet访问权限。

简单的RSS的XML文件标准格式是这样的：

<?xml version="1.0" encoding="GBK"?>
<item id="1">
	<title></title>
	<link></link>
	<description></description>
	<pubDate></pubDate>
</item>
<item id="2">
	<title></title>
	<link></link>
	<description></description>
	<pubDate></pubDate>
</item>

res/layout/news_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent" android:layout_height="?android:attr/listPreferredItemHeight">  
	<TextView 
		android:id="@+id/title" 
		android:layout_width="fill_parent"
		android:layout_height="wrap_content" 
		android:textColor="@android:color/white"
		android:textStyle="bold"
		android:layout_alignParentTop="true"
		android:gravity="left" />
	<TextView 
		android:id="@+id/pubDate" 
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:layout_below="@id/title"
		android:gravity="left" />
</RelativeLayout>  

RssReaderListActivity.java

package com.zeph.android.rss.reader;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;

import android.app.ListActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class RssReaderListActivity extends ListActivity {
	private String XmlSourceStr;
	private MyXmlHandler myXmlHandler;
	private List<RssNews> newsList;
	private ListView mListView = null;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		mListView = getListView();
		newsList = new ArrayList<RssNews>(100);
		myXmlHandler = new MyXmlHandler(newsList);
		ArrayList<Map<String, Object>> mData = new ArrayList<Map<String, Object>>();
		XmlConnection("http://news.163.com/special/00011K6L/rss_newstop.xml");
		XmlParse();
		if (!newsList.isEmpty()) {
			Iterator<RssNews> it = newsList.iterator();
			while (it.hasNext()) {
				RssNews news = (RssNews) it.next();
				HashMap<String, Object> map = new HashMap<String, Object>();
				map.put("title", news.getTitle());
				map.put("pubDate", news.getPubDate());
				mData.add(map);
			}
		}
		SimpleAdapter adapter = new SimpleAdapter(this, mData,
				R.layout.news_item, new String[] { "title", "pubDate" },
				new int[] { R.id.title, R.id.pubDate });
		setListAdapter(adapter);
		mListView.setOnItemClickListener(new ListOnItemClick());
	}

	public void XmlConnection(String urlStr) {
		URL url = null;
		try {
			url = new URL(urlStr);
		} catch (MalformedURLException e) {
			e.printStackTrace();
		}
		if (url != null) {
			try {
				HttpURLConnection urlConnection = (HttpURLConnection) url
						.openConnection();
				InputStreamReader isReader = new InputStreamReader(
						urlConnection.getInputStream(), "GBK");
				BufferedReader br = new BufferedReader(isReader);
				StringBuffer sb = new StringBuffer();
				String line = null;
				while ((line = br.readLine()) != null) {
					sb.append(line);
				}
				isReader.close();
				urlConnection.disconnect();
				XmlSourceStr = sb.toString();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	public void XmlParse() {
		try {
			SAXParserFactory factory = SAXParserFactory.newInstance();
			SAXParser parser = factory.newSAXParser();
			XMLReader reader = parser.getXMLReader();
			reader.setContentHandler(myXmlHandler);
			reader.parse(new InputSource(new StringReader(XmlSourceStr)));
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	public class ListOnItemClick implements OnItemClickListener {

		@Override
		public void onItemClick(AdapterView<?> parent, View view, int position,
				long id) {
			RssNews news = newsList.get(position);
			Intent intent = new Intent(Intent.ACTION_VIEW);
			intent.setData(Uri.parse(news.getLink()));
			startActivity(intent);
		}

	}
}

MyXmlHandler.java

package com.zeph.android.rss.reader;

import java.util.List;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class MyXmlHandler extends DefaultHandler {
	private String XMLParseName;
	private List<RssNews> NewsList;
	private RssNews News;

	public MyXmlHandler(List<RssNews> NewsList) {
		this.NewsList = NewsList;
	}

	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		super.characters(ch, start, length);
		String value = new String(ch, start, length);
		if (XMLParseName.equals("title")) {
			News.setTitle(value);
		} else if (XMLParseName.equals("link")) {
			News.setLink(value);
		} else if (XMLParseName.equals("description")) {
			News.setDescription(value);
		} else if (XMLParseName.equals("pubDate")) {
			News.setPubDate(value);
		}
	}

	@Override
	public void startDocument() throws SAXException {
		super.startDocument();
	}

	/**
	 * uri是命名空间 URI localName是不带命名空间前缀的标签名 qName是带命名空间前缀的标签名
	 * attributes可以得到所有的属性名和相应的值
	 * 
	 * @param
	 */
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		super.startElement(uri, localName, qName, attributes);
		if (localName.equals("title")) {
			News = new RssNews();
		}
		XMLParseName = localName;

	}

	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		super.endElement(uri, localName, qName);
		if (localName.equals("item")) {
			NewsList.add(News);
		}
	}

	@Override
	public void endDocument() throws SAXException {
		super.endDocument();
	}
}

RssNews.java

package com.zeph.android.rss.reader;

public class RssNews {
	/** 新闻标题 **/
	private String title;
	/** 新闻链接 **/
	private String link;
	/** 新闻描述 **/
	private String description;
	/** 新闻发表时间 **/
	private String pubDate;

	public RssNews() {

	}

	public RssNews(String title, String link, String description, String pubDate) {
		this.title = title;
		this.link = link;
		this.description = description;
		this.pubDate = pubDate;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getLink() {
		return link;
	}

	public void setLink(String link) {
		this.link = link;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public String getPubDate() {
		return pubDate;
	}

	public void setPubDate(String pubDate) {
		this.pubDate = pubDate;
	}
}