Android解析XML的三种方式SAX、Pull、Dom

<?xml version="1.0" encoding="utf-8"?>
<channel>
<item id="0" url="http://www.baidu.com">百度</item>
<item id="1" url="http://www.qq.com">腾讯</item>
<item id="2" url="http://www.sina.com.cn">新浪</item>
<item id="3" url="http://www.taobao.com">淘宝</item>
</channel> 

public class SAXPraserHelper extends DefaultHandler {

 final int ITEM = 0x0005;

 List<channel> list;
 channel chann;
 int currentState = 0;

 public List<channel> getList() {
  return list;
 }

 /*
  * 接口字符块通知
*/
 @Override
 public void characters(char[] ch, int start, int length)
   throws SAXException {
  // TODO Auto-generated method stub
// super.characters(ch, start, length);
  String theString = String.valueOf(ch, start, length);
  if (currentState != 0) {
   chann.setName(theString);
   currentState = 0;
  }
  return;
 }

 /*
  * 接收文档结束通知
*/
 @Override
 public void endDocument() throws SAXException {
  // TODO Auto-generated method stub
  super.endDocument();
 }

 /*
  * 接收标签结束通知
*/
 @Override
 public void endElement(String uri, String localName, String qName)
   throws SAXException {
  // TODO Auto-generated method stub
  if (localName.equals("item"))
   list.add(chann);
 }

 /*
  * 文档开始通知
*/
 @Override
 public void startDocument() throws SAXException {
  // TODO Auto-generated method stub
  list = new ArrayList<channel>();
 }

 /*
  * 标签开始通知
*/
 @Override
 public void startElement(String uri, String localName, String qName,
   Attributes attributes) throws SAXException {
  // TODO Auto-generated method stub
  chann = new channel();
  if (localName.equals("item")) {
   for (int i = 0; i < attributes.getLength(); i++) {
    if (attributes.getLocalName(i).equals("id")) {
     chann.setId(attributes.getValue(i));
    } else if (attributes.getLocalName(i).equals("url")) {
     chann.setUrl(attributes.getValue(i));
    }
   }
   currentState = ITEM;
   return;
  }
  currentState = 0;
  return;
 }
}

private List<channel> getChannelList() throws ParserConfigurationException, SAXException, IOException
 {
  //实例化一个SAXParserFactory对象
  SAXParserFactory factory=SAXParserFactory.newInstance();
  SAXParser parser;
  //实例化SAXParser对象，创建XMLReader对象，解析器
  parser=factory.newSAXParser();
  XMLReader xmlReader=parser.getXMLReader();
  //实例化handler，事件处理器
  SAXPraserHelper helperHandler=new SAXPraserHelper();
  //解析器注册事件
  xmlReader.setContentHandler(helperHandler);
  //读取文件流
  InputStream stream=getResources().openRawResource(R.raw.channels);
  InputSource is=new InputSource(stream);
  //解析文件
  xmlReader.parse(is);
  return helperHandler.getList();
 }

private List<Map<String, String>> getData() {
  List<Map<String, String>> list = new ArrayList<Map<String, String>>();
  XmlResourceParser xrp = getResources().getXml(R.xml.channels);

  try {
   // 直到文档的结尾处
   while (xrp.getEventType() != XmlResourceParser.END_DOCUMENT) {
    // 如果遇到了开始标签
    if (xrp.getEventType() == XmlResourceParser.START_TAG) {
     String tagName = xrp.getName();// 获取标签的名字
     if (tagName.equals("item")) {
      Map<String, String> map = new HashMap<String, String>();
      String id = xrp.getAttributeValue(null, "id");// 通过属性名来获取属性值
      map.put("id", id);
      String url = xrp.getAttributeValue(1);// 通过属性索引来获取属性值
      map.put("url", url);
      map.put("name", xrp.nextText());
      list.add(map);
     }
    }
    xrp.next();// 获取解析下一个事件
   }
  } catch (XmlPullParserException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  return list;
 }

public static List<channel> getChannelList(InputStream stream)
 {
  List<channel> list=new ArrayList<channel>();
  
  //得到 DocumentBuilderFactory 对象, 由该对象可以得到 DocumentBuilder 对象
  DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
  
  try {
   //得到DocumentBuilder对象
   DocumentBuilder builder=factory.newDocumentBuilder();
   //得到代表整个xml的Document对象
   Document document=builder.parse(stream);
   //得到 "根节点" 
   Element root=document.getDocumentElement();
   //获取根节点的所有items的节点
   NodeList items=root.getElementsByTagName("item"); 
   //遍历所有节点
   for(int i=0;i<items.getLength();i++)
   {
    channel chann=new channel();
    Element item=(Element)items.item(i);
    chann.setId(item.getAttribute("id"));
    chann.setUrl(item.getAttribute("url"));
    chann.setName(item.getFirstChild().getNodeValue());
    list.add(chann);
   }
   
  } catch (ParserConfigurationException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SAXException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
  return list;
 }