android pull 解析器解析xml文档

person.xml

<?xml version="1.0" encoding="UTF-8"?>
<persons>
    <person id="23">
        <name>liming</name>
        <age>30</age>
    </person>
    <person id="20">
        <name>zhangxiaoxiao</name>
        <age>25</age>
    </person>
</persons>

public class PersonService {
    /**
     * 获取数据
     * @param xml
     * @return
     * @throws Exception
     */
    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");//为Pull解析器设置要解析的XML数据
        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;
    }
    /**
     * 保存数据
     * @param persons 数据
     * @param out 输出方向
     * @throws Exception
     */
    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();
    }
}

//获取应用下的files文件路径
getContext().getFilesDir()