Android软件开发

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Android平台dom、sax、pull三种解析xml文件的实例代码

效果图：

关键代码：

    private List<River> fetchRiverFormXmlByPull(String fileName) {
     long startTime = System.currentTimeMillis();
     List<River> rivers = new ArrayList<River>();
     River river = null;
     InputStream inputStream = null;
     XmlPullParser xmlPullParser = Xml.newPullParser();
     try {
      inputStream = getAssets().open(fileName);
   xmlPullParser.setInput(inputStream, "utf-8");
   xmlPullParser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
   //xmlPullParser.nextTag();
   int eventType = xmlPullParser.getEventType();
   while(eventType != XmlPullParser.END_DOCUMENT) {
    switch(eventType) {
    case XmlPullParser.START_TAG:
     String tag = xmlPullParser.getName();
     if(tag.equalsIgnoreCase(riverStr)) {
      river = new River();
      river.setName(xmlPullParser.getAttributeValue(null, nameStr));
      river.setLength(Integer.parseInt(xmlPullParser.getAttributeValue(null, lengthStr)));
     }else if(river != null) {
      if(tag.equalsIgnoreCase(introductionStr)) {
       river.setIntroduction(xmlPullParser.nextText());
      } else if(tag.equalsIgnoreCase(imageurlStr)) {
       river.setImageurl(xmlPullParser.nextText());
      }
     }
     break;
    case XmlPullParser.END_TAG:
     if(xmlPullParser.getName().equalsIgnoreCase(riverStr) && river != null) {
      rivers.add(river);
      river = null;
     }
     break;
     default:
      break;
    }
    eventType = xmlPullParser.next();
   }
  } catch (XmlPullParserException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
     Log.d(T, "exec fetchRiverFormXmlByPull use time = " + (System.currentTimeMillis() - startTime));
     return rivers;
    }
   
    private List<River> fetchRiverFormXmlBySAX(String fileName) {
     long startTime = System.currentTimeMillis();
     List<River> rivers = null;
     SAXParserFactory factory = SAXParserFactory.newInstance();
     InputStream inputStream = null;
     try {
   SAXParser parser = factory.newSAXParser();
   XMLReader reader = parser.getXMLReader();
   MySaxHandler handler = new MySaxHandler();
   reader.setContentHandler(handler);
   inputStream = getAssets().open(fileName);
   reader.parse(new InputSource(inputStream));
   rivers = handler.getRivers();
  } catch (ParserConfigurationException e) {
   e.printStackTrace();
  } catch (SAXException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
     Log.d(T, "exec fetchRiverFormXmlBySAX use time = " + (System.currentTimeMillis() - startTime));
     return rivers;
    }
   
    private class MySaxHandler extends DefaultHandler {
   
     private List<River> rivers = null;
     
     private boolean isRiver = false;
     
     private boolean isIntrocduce = false;
     
     private boolean isImageUrl = false;
     
     private River river = null;
     
     private String TAG = "MySaxHandler";
     
     public MySaxHandler() {
      rivers = new ArrayList<River>();
     }
     
     @Override
     public void startDocument() throws SAXException {
      super.startDocument();
      Log.d(TAG, "### startDocument");
     }
     
     @Override
     public void endDocument() throws SAXException {
      super.endDocument();
      Log.d(TAG, "### endDocument");
     }
     
     @Override
     public void startElement(String uri, String localName, String qName,
       Attributes attributes) throws SAXException {
      super.startElement(uri, localName, qName, attributes);
      String tagName = localName.length()>0?localName:qName;
      if(tagName.equals(riverStr)) {
       isRiver = true;
       river = new River();
       river.setName(attributes.getValue(nameStr));
       river.setLength(Integer.parseInt(attributes.getValue(lengthStr)));
      }
      if(isRiver) {
       if(tagName.equals(introductionStr)) {
        isIntrocduce = true;
       } else if(tagName.equals(imageurlStr)) {
        isImageUrl = true;
       }
      }
       
     }
     
     @Override
     public void endElement(String uri, String localName, String qName)
       throws SAXException {
      super.endElement(uri, localName, qName);
      //Log.d(TAG, "### endElement uri=" + uri + " localName=" + localName + " qName=" + qName);
      String tagName=localName.length()!=0?localName:qName;
      if(tagName.equals(riverStr)) {
       isRiver = false;
       rivers.add(river);
      }
      if(isRiver) {
       if(tagName.equals(introductionStr)) {
        isIntrocduce = false;
       } else if(tagName.equals(imageurlStr)) {
        isImageUrl = false;
       }
      }
     }
     
     @Override
     public void characters(char[] ch, int start, int length)
       throws SAXException {
      super.characters(ch, start, length);
      if(isIntrocduce) {
       river.setIntroduction(river.getIntroduction() == null ? "" : river.getIntroduction() + new String(ch,start,length));
      }else if(isImageUrl) {
       river.setImageurl(river.getImageurl()==null ? "" : river.getImageurl()+ new String(ch,start,length));
      }
     }
     
     public List<River> getRivers(){
      return rivers;
     }
     
    }
   
    private List<River> fetchRiverFromXmlByDom(String fileName) {
     long startTime = System.currentTimeMillis();
     List<River> rivers = new ArrayList<River>();
     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
     InputStream inputStream = null;
     try {
   DocumentBuilder builder = factory.newDocumentBuilder();
   inputStream = getAssets().open(fileName);
   Document document = builder.parse(inputStream);
   Element root =  document.getDocumentElement();
   NodeList nodeList = root.getElementsByTagName(riverStr);
   int noteListSize = nodeList.getLength();
   River river = null;
   for(int i=0;i<noteListSize;i++) {
    river = new River();
    Element element = (Element) nodeList.item(i);
    river.setName(element.getAttribute(nameStr));
    river.setLength(Integer.parseInt(element.getAttribute(lengthStr)));
    Element introTag = (Element) element.getElementsByTagName(introductionStr).item(0);
    river.setIntroduction(introTag.getFirstChild().getNodeValue());
    Element imageUrlTag = (Element) element.getElementsByTagName(imageurlStr).item(0);
    river.setImageurl(imageUrlTag.getFirstChild().getNodeValue());
    rivers.add(river);
   }
  } catch (ParserConfigurationException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } catch (SAXException e) {
   e.printStackTrace();
  }
     Log.d(T, "exec fetchRiverFromXmlByDom use time = " + (System.currentTimeMillis() - startTime));
     return rivers;
    }

代码下载地址：http://www.drovik.com/android/demo/PullXmlDemo.rar