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以下是用DOM方式解析XML数据的实例
我们可以在项目自带的assets文件夹中新建一个xml文件保存xml数据以供解析,以下是我在assets文件夹下建的userinfo.xml。

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<?xml version="1.0" encoding="UTF-8"?>
<root>
    <userinfo>
        <username>Carlos</username>
        <age>21</age>
    </userinfo>
    <userinfo>
        <username>Jack</username>
        <age>19</age>
    </userinfo>
</root>

SAX解析类

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package com.carlos.xml;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

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

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

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class SaxParseXml extends Activity{

	private static final String TAG="SaxParseXml";
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		parseXml();
	}
	
	void parseXml(){
		try {
			InputStream inputStream=getResources().getAssets().open("userinfo.xml");
			
			//实例化一个SAXParseFactory对象
			SAXParserFactory factory=SAXParserFactory.newInstance();
			//创建解析器
			SAXParser parser=factory.newSAXParser();
			SaxPraseHelper helper=new SaxPraseHelper();
			parser.parse(inputStream, helper);
			inputStream.close();
			
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		}
		
	}
	
	class SaxPraseHelper extends DefaultHandler{

		List<UserInfo> infos;
		UserInfo info;
		String tagName;
		
		//文档开始
		@Override
		public void startDocument() throws SAXException {
			Log.i(TAG, "startDocument");
			infos=new ArrayList<UserInfo>();
		}
		
		//元素开始
		@Override
		public void startElement(String uri, String localName, String qName,
				Attributes attributes) throws SAXException {
			super.startElement(uri, localName, qName, attributes);
			Log.i(TAG, "startElement");
			tagName=localName;
			if (tagName.equals("userinfo")) {
				info=new UserInfo();
			}
		}
		
		//接收字符
		@Override
		public void characters(char[] ch, int start, int length)
				throws SAXException {
			super.characters(ch, start, length);
			Log.i(TAG, "characters");
			if (tagName!=null) {
				String data=new String(ch,start,length);
				if (tagName.equals("username")) {
					info.setUsername(data);
				}else if (tagName.equals("age")) {
					info.setAge(data);
				}
			}
			
		}
		
		//元素结束
		@Override
		public void endElement(String uri, String localName, String qName)
				throws SAXException {
			super.endElement(uri, localName, qName);
			Log.i(TAG, "endElement");
			if (localName.equals("userinfo")) {
				infos.add(info);
			}
			tagName=null;
		}
		
		//文档结束
		@Override
		public void endDocument() throws SAXException {
			Log.i(TAG, "endDocument");
			//用Logcat日志打印出解析XML数据得到的结果
			for(int i=0;i<infos.size();i++){
				info=infos.get(i);
				Log.i(TAG, info.getUsername());
				Log.i(TAG,info.getAge());
			}
		}
	}
}

Logcat日志中打印出的结果

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