在我们的Android解析XML的开发中，除了可以使用SAX和DOM解析XML文件，大家也可以使用Android内置的Pull解析器解析XML文件。Android Pull解析器的运行方式与SAX解析器相似。它提供了类似的事件，如：开始元素和结束元素事件，使用parser.next()可以进入下一个元素并触发相应事件。事件将作为数值代码被发送，因此可以使用一个switch对感兴趣的事件进行处理。当元素开始解析时，调用parser.nextText()方法可以获取下一个Text类型元素的值。
package com.gao.service;
import java.io.InputStream;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlSerializer;
import android.util.Xml;
import com.gao.domain.Person;
public class PullPersonService {
public static void writeXML(List<Person> personList, Writer writer)
throws Exception {
XmlSerializer serializer = Xml.newSerializer();
serializer.setOutput(writer);
serializer.startDocument("UTF-8", true);
serializer.startTag(null, "persons");
for (Person person : personList) {
serializer.startTag(null, "person");
serializer.attribute(null, "id", String.valueOf(person.getId()));
serializer.startTag(null, "name");
serializer.text(person.getName());
serializer.endTag(null, "name");
serializer.startTag(null, "age");
serializer.text(String.valueOf(person.getAge()));
serializer.endTag(null, "age");
serializer.endTag(null, "person");
}
serializer.endTag(null, "persons");
}
public static List<Person> readXML(InputStream inputStream)
throws Exception {
List<Person> personList = null;
XmlPullParser parser = Xml.newPullParser();
parser.setInput(inputStream, "UTF-8");
int eventCode = parser.getEventType();
Person person = null;
while (eventCode != XmlPullParser.END_DOCUMENT) {
switch (eventCode) {
case XmlPullParser.START_DOCUMENT:
personList = new ArrayList<Person>();
break;
case XmlPullParser.START_TAG:
if ("person".equals(parser.getName())) {
person = new Person();
person.setId(new Integer(parser.getAttributeValue(0)));
} else if (person != null) {
if ("name".equals(parser.getName())) {
person.setName(parser.nextText());
} else if ("age".equals(parser.getName())) {
person.setAge(new Integer(parser.nextText()));
}
}
break;
case XmlPullParser.END_TAG:
if ("person".equals(parser.getName()) && person != null) {
personList.add(person);
}
default:
break;
}
eventCode = parser.next();
}
return personList;
}
}
测试：
public void testReadPullXML() throws Exception {
InputStream inputStream=XMLPersonServiceTest.class.getClassLoader().getResourceAsStream("gao.xml");
List<Person> persons=PullPersonService.readXML(inputStream);
for (Person person : persons) {
Log.i(TAG, person.toString());
}
}
public void testWritePullXML() throws Exception {
FileOutputStream fileOutputStream=this.getContext().openFileOutput("person.xml", Context.MODE_WORLD_READABLE);
OutputStreamWriter writer=new OutputStreamWriter(fileOutputStream, "UTF-8");
BufferedWriter bufferedWriter=new BufferedWriter(writer);
List<Person> personList=new ArrayList<Person>();
personList.add(new Person(12,"Gao",34));
personList.add(new Person(34,"高",23));
personList.add(new Person(34,"GaoMatrix",34));
PullPersonService.writeXML(personList, bufferedWriter);
/*StringWriter writer=new StringWriter();
List<Person> personList=new ArrayList<Person>();
personList.add(new Person(12,"Gao",34));
personList.add(new Person(34,"高",23));
personList.add(new Person(34,"GaoMatrix",34));
PullPersonService.writeXML(personList, writer);
Log.i(TAG, writer.toString());*/
}
