android xml解析－Pull解析

解析一下的xml为例：

<?xml version="1.0" encoding="UTF-8"?>
<persons>
	<person id="23">
		<name>daidai</name>
		<age>20</age>
	</person>
	<person id="20">
		<name>wxxu</name>
		<age>25</age>
	</person>
</persons>

1.调用解析方法

public void testPersons() throws Exception{
		InputStream xml = this.getClass().getClassLoader().getResourceAsStream("person.xml");
		List<Person> persons = PersonService.getPersons(xml);
		for(Person person : persons){
			Log.i(TAG, person.toString());
		}
	}

2.PersonService中的getPersons(xml)方法

public static List<Person> getPersons(InputStream xml) throws Exception{
		List<Person> persons = null;
		Person person = null;
		XmlPullParser pullParser = Xml.newPullParser();
		pullParser.setInput(xml, "UTF-8");
		int event = pullParser.getEventType();
		while(event != XmlPullParser.END_DOCUMENT){
			switch (event) {
			case XmlPullParser.START_DOCUMENT:
				persons = new ArrayList<Person>();
				break;
				
			case XmlPullParser.START_TAG:
				if("person".equals(pullParser.getName())){
					int id = new Integer(pullParser.getAttributeValue(0));
					person = new Person();
					person.setId(id);
				}
				if("name".equals(pullParser.getName())){
					String name = pullParser.nextText();
					person.setName(name);
				}
				if("age".equals(pullParser.getName())){
					int age = new Integer(pullParser.nextText());
					person.setAge(age);
				}
				break;
				
			case XmlPullParser.END_TAG:
				if("person".equals(pullParser.getName())){
					persons.add(person);
					person = null;
				}
				break;
			}
			event = pullParser.next();
		}
		return persons;
	}

3.生成xml方法的调用

public void testSave() throws Exception{
		List<Person> persons = new ArrayList<Person>();
		persons.add(new Person(43, "zhangxx", 80));
		persons.add(new Person(12, "lili", 20));
		persons.add(new Person(78, "xiaoxiao", 8));
		File xmlFile = new File(getContext().getFilesDir(), "itcast.xml");
		FileOutputStream outStream = new FileOutputStream(xmlFile);
		PersonService.save(persons, outStream);
	}

4.PersonService中的save保存成xml方法

public static void save(List<Person> persons, OutputStream out) throws Exception{
		XmlSerializer serializer = Xml.newSerializer();
		serializer.setOutput(out, "UTF-8");
		serializer.startDocument("UTF-8", true);
		serializer.startTag(null, "persons");
		for(Person person : persons){
			serializer.startTag(null, "person");
			serializer.attribute(null, "id", person.getId().toString());
			
			serializer.startTag(null, "name");
			serializer.text(person.getName());
			serializer.endTag(null, "name");
			
			serializer.startTag(null, "age");
			serializer.text(person.getAge().toString());
			serializer.endTag(null, "age");
			
			serializer.endTag(null, "person");
		}
		serializer.endTag(null, "persons");
		serializer.endDocument();
		out.flush();
		out.close();
	}