Android 使用SAX解析XML

项目的结构

首先新建一个book_info.xml的xml文件，结构如下：

<?xml version="1.0" encoding="UTF-8"?>
<books>  
  <catalog>Computer</catalog>    
　　<book> 
     <country>USA</country>     
　　　　<title>Empire Burlesque</title>      
　　　　<artist>Bob Dylan</artist>     
　　　　<price>10.90</price>    
  </book>      

  <book>  
    <country>UK</country>        
　　　<title>Hide your heart</title>   
   　　 <artist>Bonnie Tyler</artist>   
  　　  <price>9.90</price>      
　　</book>      

　　<book>   
   <country>USA</country>  
  　　<title>Greatest Hits</title>   
  　　 <artist>Dolly Parton</artist>    
 　　 <price>9.90</price>    
  </book>   
</books>

 BookItem.java 代表一本书的信息，代码如下：

package com.example.utility;

public class BookItem {
	public String name;
	public String title;
	public String artit;
	public String price;
	
	public BookItem() {
		
	}

	public String getName() {	
		return name;
	}

	public void setName(String countryName)
	{	
		this.name = countryName;	
	}
	
	public  String getTitle() {
		return title;
	}

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

	public void setArtist(String artit)
	{	
		this.artit = artit;
	}
	
	public  String getPrice() {
		return price;
	}

	public void setPrice(String price)
	{	
		this.price = price;
	}
}

 BookFeed代表所有书的信息，代码如下：

package com.example.utility;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Vector;

public class BookFeed {
	private String catalog;
	private List<BookItem> bookList;
	private int itemcount;
	
	public BookFeed()
	{
		bookList = new Vector<BookItem>(0);
	}
	
	public int addBookItem(BookItem item)
	{
		itemcount++;
		bookList.add(item);
		return itemcount;
	}
	
	public BookItem getBookItem(int location)
	{
		return bookList.get(location);
	}
	
	public List<BookItem> getAllBooks() {
		return bookList;
	}
	
	public  String getCatalog() {
		return catalog;
	}
	

	public void setCatalog(String catalog)
	{	
		this.catalog = catalog;
	}
	
	public  List<BookItem> getBookList() {
		return bookList;
	}

	public void setBookList(List<BookItem> bookList)
	{	
		this.bookList = bookList;
	}
	
	public  List GetAllBooks() {
		List<Map<String, String>> data = new ArrayList<Map<String,String>>() ;
		int size = bookList.size();
		for (int i = 0; i < size; i++) {
			HashMap<String, String> bookItemHashMap = new HashMap<String, String>();
			bookItemHashMap.put("title", bookList.get(i).getTitle());
			bookItemHashMap.put("price", bookList.get(i).getPrice());
			data.add(bookItemHashMap);
		}
		
		return data;
	}
}

 BookHand.java

package com.example.utility;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import android.R.integer;


public class BookHandle extends DefaultHandler {

	BookFeed bookFeed;
	BookItem bookItem;
	
	final int Book_Country = 1;
	final int Book_Title = 2;
	final int Book_Artist = 3;
	final int Book_Price = 4;
    int curState = 0;
	
	
	public BookHandle() {
		
	}
	
	public BookFeed getBookFeed() {
		return bookFeed;
	}
	
	@Override
	public void startDocument() throws SAXException
	{
		bookFeed = new BookFeed();
		bookItem = new BookItem();
	}
	
	@Override
	public void endDocument() throws SAXException
	{
		
	}
	
	 @Override  
	 public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
		if (localName.equals("books")) {
			curState = 0;	
			return;
		}
		
		if (localName.equals("book")) {
			bookItem = new BookItem();
			return;
		}
		
		if (localName.equals("country")) {
			curState = Book_Country;
			return;
		}
		
		if (localName.equals("title")) {
			curState = Book_Title;
			return;
		}
		
		if (localName.equals("artist")) {
			curState = Book_Artist;
			return;
		}
		
		if (localName.equals("price")) {
			curState = Book_Price;
			return;
		}
		
		curState = 0;
	}
	
	@Override
	public void endElement(String uri, String localName,String qName) throws SAXException
	{
		if (localName.equals("book")) {
			bookFeed.addBookItem(bookItem);
			return;
		}
	}
	
	@Override 
	public void characters(char[] ch, int start, int length) throws SAXException {
		String str = new String(ch,start,length);
		switch (curState) {
		case Book_Country:
			bookItem.setName(str);
			curState = 0;
			break;
		case Book_Title:
			bookItem.setTitle(str);
			curState = 0;
			break;
		case Book_Artist:
			bookItem.setArtist(str);
			curState = 0;
			break;
		case Book_Price:
			bookItem.setPrice(str);
			curState = 0;
			break;

		default:
			return;
		}
	}
	
}

 MainActiviyt.java

public class MainActivity extends Activity {

	public BookFeed feed; 
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		feed = getFeed();
		showList();
	}

	private void showList() {
		// TODO Auto-generated method stub
		ListView lView = (ListView)this.findViewById(R.id.listView1);
		if (feed == null) {
			Log.i("Custom Message", "feed is null");
			return;
		}
		
		SimpleAdapter adapter = new SimpleAdapter(
				this,
				feed.GetAllBooks(), 
				android.R.layout.simple_list_item_2,
				new String[]{"title","price"},
				new int[]{android.R.id.text1, android.R.id.text2});
		
		lView.setAdapter(adapter);
	}

	public BookFeed  getFeed() {
		try {
			SAXParserFactory factory = SAXParserFactory.newInstance();
			SAXParser parser = factory.newSAXParser();
			XMLReader reader = parser.getXMLReader();
			BookHandle handle = new BookHandle();
			reader.setContentHandler(handle);
			InputSource iSource = new InputSource(this.getClassLoader().getResourceAsStream("book_info.xml"));
			reader.parse(iSource);
			return handle.getBookFeed();
			
		} catch (ParserConfigurationException e) {
			// TODO: handle exception
			e.printStackTrace();
		}
		catch (SAXException e) {
			// TODO: handle exception
			e.printStackTrace();
		}
		catch (IOException e) {
			// TODO: handle exception
			e.printStackTrace();
		}
		return null;
	}
}

 效果图：