Android 创建与解析XML（四）——详解Pull方式

 /** Pull方式，创建 XML */ 
  public String pullXMLCreate(){ 
    StringWriter xmlWriter = new StringWriter(); 
 
    Person []persons = new Person[3];    // 创建节点Person对象 
    persons[0] = new Person(1, "sunboy_2050", "http://blogcsdnnet/sunboy_2050"); 
    persons[1] = new Person(2, "baidu", "http://wwwbaiducom"); 
    persons[2] = new Person(3, "google", "http://wwwgooglecom"); 
     
    try { 
//     // 方式一：使用Android提供的实用工具类androidutilXml 
//     XmlSerializer xmlSerializer = XmlnewSerializer();    
       
      // 方式二：使用工厂类XmlPullParserFactory的方式 
      XmlPullParserFactory factory = XmlPullParserFactorynewInstance(); 
      XmlSerializer xmlSerializer = factorynewSerializer(); 
       
      xmlSerializersetOutput(xmlWriter);       // 保存创建的xml 
       
      xmlSerializersetFeature("http://xmlpullorg/v1/doc/featureshtml#indent-output", true); 
//     xmlSerializersetProperty("http://xmlpullorg/v1/doc/propertieshtml#serializer-indentation", " ");     // 设置属性 
//     xmlSerializersetProperty("http://xmlpullorg/v1/doc/propertieshtml#serializer-line-separator", "\n"); 
      xmlSerializerstartDocument("utf-8", null);   // <?xml version='0' encoding='UTF-8' standalone='yes' ?>  
       
      xmlSerializerstartTag("", "root"); 
      xmlSerializerattribute("", "author", "homer"); 
      xmlSerializerattribute("", "date", "2012-04-28"); 
       
      int personsLen = personslength; 
      for(int i=0; i<personsLen; i++) { 
        xmlSerializerstartTag("", "person");    // 创建person节点 
         
        xmlSerializerstartTag("", "id"); 
        xmlSerializertext(persons[i]getId()+""); 
        xmlSerializerendTag("", "id"); 
 
        xmlSerializerstartTag("", "name"); 
        xmlSerializertext(persons[i]getName()); 
        xmlSerializerendTag("", "name"); 
 
        xmlSerializerstartTag("", "blog"); 
        xmlSerializertext(persons[i]getBlog()); 
        xmlSerializerendTag("", "blog"); 
         
        xmlSerializerendTag("", "person"); 
      } 
       
      xmlSerializerendTag("", "root"); 
      xmlSerializerendDocument(); 
       
    } catch (XmlPullParserException e) {    // XmlPullParserFactorynewInstance 
      eprintStackTrace(); 
    } catch (IllegalArgumentException e) {   // xmlSerializersetOutput 
      eprintStackTrace(); 
    } catch (IllegalStateException e) {     // xmlSerializersetOutput 
      eprintStackTrace(); 
    } catch (IOException e) {    // xmlSerializersetOutput 
      eprintStackTrace(); 
    } catch (Exception e) { 
      eprintStackTrace(); 
    } 
     
    savedXML(fileName, xmlWritertoString()); 
    return xmlWritertoString(); 
  } 

 /** Pull方式，解析 XML */ 
  public String pullXMLResolve(){ 
    StringWriter xmlWriter = new StringWriter(); 
     
    InputStream is = readXML(fileName); 
    try { 
//     // 方式一：使用Android提供的实用工具类androidutilXml 
//     XmlPullParser xpp = XmlnewPullParser(); 
       
      // 方式二：使用工厂类XmlPullParserFactory的方式 
      XmlPullParserFactory factory = XmlPullParserFactorynewInstance(); 
      XmlPullParser xpp = factorynewPullParser(); 
       
      xppsetInput(is, "utf-8"); 
       
      List<Person> personsList = null;   // 保存xml的person节点 
      Person person = null; 
      StringBuffer xmlHeader = null;     // 保存xml头部 
      String ele = null;   // Element flag 
       
      int eventType = xppgetEventType(); 
      while(XmlPullParserEND_DOCUMENT != eventType) { 
        switch (eventType) { 
        case XmlPullParserSTART_DOCUMENT: 
          personsList = new ArrayList<Person>();    // 初始化persons 
          xmlHeader = new StringBuffer();       // 初始化xmlHeader 
          break; 
           
        case XmlPullParserSTART_TAG: 
          if("root"equals(xppgetName())) { 
            String attrAuthor = xppgetAttributeValue(0); 
            String attrDate = xppgetAttributeValue(1); 
            xmlHeaderappend("root")append("\t\t"); 
            xmlHeaderappend(attrAuthor)append("\t"); 
            xmlHeaderappend(attrDate)append("\n"); 
          } else if("person"equals(xppgetName())) { 
            person = new Person();     // 创建person实例 
          } else if("id"equals(xppgetName())) { 
            ele = "id"; 
          } else if("name"equals(xppgetName())) { 
            ele = "name"; 
          } else if("blog"equals(xppgetName())) { 
            ele = "blog"; 
          } else { 
            ele = null; 
          } 
          break; 
           
        case XmlPullParserTEXT: 
          if(null != ele) { 
            if("id"equals(ele)) { 
              personsetId(IntegerparseInt(xppgetText())); 
            } else if("name"equals(ele)) { 
              personsetName(xppgetText()); 
            } else if("blog"equals(ele)) { 
              personsetBlog(xppgetText()); 
            } 
          } 
          break; 
           
        case XmlPullParserEND_TAG: 
          if("person"equals(xppgetName())){ 
            personsListadd(person); 
            person = null; 
          } 
          ele = null; 
          break; 
        } 
         
        eventType = xppnext();   // 下一个事件类型 
      } 
       
      xmlWriterappend(xmlHeader); 
      int personsLen = personsListsize(); 
      for(int i=0; i<personsLen; i++) { 
        xmlWriterappend(personsListget(i)toString()); 
      } 
       
    } catch (XmlPullParserException e) {    // XmlPullParserFactorynewInstance 
      eprintStackTrace(); 
    } catch (Exception e) { 
      eprintStackTrace(); 
    } 
     
    return xmlWritertoString();     
  }