android（9）（使用pull解析xml文件）

beans类：
public class Person {

    private int id;
    private String name;
    private int age;
    @Override
    public String toString() {
        return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
    }
    public Person(int id, String name, int age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }
    public Person() {
        super();
        // TODO Auto-generated constructor stub
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
序列化xml文件和pull解析xml文件：
public class TestCase extends AndroidTestCase {

    public void test() {
// writeXmlToLocal();

        List<Person> personList = parserXmlFromLocal();

        for (Person person : personList) {
            Log.i("TestCase", person.toString());
        }
    }

    /** * 写xml文件到本地 */
    private void writeXmlToLocal() {
        List<Person> personList = getPersonList();

        // 获得序列化对象
        XmlSerializer serializer = Xml.newSerializer();//serializer :可被序列化的

        try {
            File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");
            FileOutputStream fos = new FileOutputStream(path);
            // 指定序列化对象输出的位置和编码
            serializer.setOutput(fos, "utf-8");

            serializer.startDocument("utf-8", true);    // 写开始 <?xml version='1.0' encoding='utf-8' standalone='yes' ?>

            serializer.startTag(null, "persons");       // <persons>

            for (Person person : personList) {
                // 开始写人（ID）

                serializer.startTag(null, "person");    // <person>
                serializer.attribute(null, "id", String.valueOf(person.getId()));

                // 写名字
                serializer.startTag(null, "name");      // <name>
                serializer.text(person.getName());
                serializer.endTag(null, "name");        // </name>

                // 写年龄
                serializer.startTag(null, "age");       // <age>
                serializer.text(String.valueOf(person.getAge()));
                serializer.endTag(null, "age");     // </age>

                serializer.endTag(null, "person");  // </person>
            }

            serializer.endTag(null, "persons");         // </persons>

            serializer.endDocument();       // 结束
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
    //得到一个存有人对象的集合
    private List<Person> getPersonList() {
        List<Person> personList = new ArrayList<Person>();

        for (int i = 0; i < 30; i++) {
            personList.add(new Person(i, "wang" + i, 18 + i));
        }

        return personList;
    }
    //从本地解析xml文件（pull解析）
    private List<Person> parserXmlFromLocal() {
        try {
            File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");
            FileInputStream fis = new FileInputStream(path);

            // 获得pull解析器对象
            XmlPullParser parser = Xml.newPullParser();
            // 指定解析的文件和编码格式
            parser.setInput(fis, "utf-8");

            int eventType = parser.getEventType();      // 获得事件类型

            List<Person> personList = null;
            Person person = null;
            String id;
            while(eventType != XmlPullParser.END_DOCUMENT) {
                String tagName = parser.getName();  // 获得当前节点的名称

                switch (eventType) {
                case XmlPullParser.START_TAG:       // 当前等于开始节点 <person>
                    if("persons".equals(tagName)) { // <persons>
                        personList = new ArrayList<Person>();
                    } else if("person".equals(tagName)) { // <person id="1">
                        person = new Person();
                        id = parser.getAttributeValue(null, "id");
                        person.setId(Integer.valueOf(id));
                    } else if("name".equals(tagName)) { // <name>
                        person.setName(parser.nextText());
                    } else if("age".equals(tagName)) { // <age>
                        person.setAge(Integer.parseInt(parser.nextText()));
                    }
                    break;
                case XmlPullParser.END_TAG:     // </persons>
                    if("person".equals(tagName)) {
                        // 需要把上面设置好值的person对象添加到集合中
                        personList.add(person);
                    }
                    break;
                default:
                    break;
                }

                eventType = parser.next();      // 获得下一个事件类型
            }
            return personList;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }