实例教程四：采用Pull解析器解析和生成XML内容

Android——activity生命周期Demo
http://www.eoeandroid.com/thread-207556-1-1.html
Android——service生命周期Demo
http://www.eoeandroid.com/thread-207558-1-1.html
android spinner 基础小实例
http://www.eoeandroid.com/thread-207188-1-1.html

<?xml version="1.0" encoding="utf-8"?>     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"         android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:orientation="vertical" >           <TextView             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:text="@string/hello" />       </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>     <resources>           <string name="hello">Hello World, MainActivity!</string>         <string name="app_name">XML解析</string>       </resources>

在src下新建的Person.xml

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

package cn.itcast.domain;       public class Person {             private Integer id;             private String name;             private Integer age;                       public Integer getId() {                     return id;             }             public void setId(Integer id) {                     this.id = id;             }             public String getName() {                     return name;             }             public void setName(String name) {                     this.name = name;             }             public Integer getAge() {                     return age;             }             public void setAge(Integer age) {                     this.age = age;             }                       @Override             public String toString() {                     return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";             }                       public Person(){                               }                       public Person(Integer id, String name, Integer age) {                     super();                     this.id = id;                     this.name = name;                     this.age = age;             }                  }

package cn.itcast.xml;       import android.app.Activity;     import android.os.Bundle;       public class MainActivity extends Activity {         /** Called when the activity is first created. */         @Override         public void onCreate(Bundle savedInstanceState) {             super.onCreate(savedInstanceState);             setContentView(R.layout.main);         }     }

package cn.itcast.service;       import java.io.InputStream;     import java.io.OutputStream;     import java.util.ArrayList;     import java.util.List;       import org.xmlpull.v1.XmlPullParser;     import org.xmlpull.v1.XmlPullParserFactory;     import org.xmlpull.v1.XmlSerializer;       import android.util.Xml;       import cn.itcast.domain.Person;       public class PersonService {                       /**              * 获取数据              * @param xml              * @return              * @throws Exception              */             public static List<Person> getPerson(InputStream xml) throws Exception{                     List<Person> persons = null;                     Person person = null;                                       //第一种写法     //                XmlPullParser pullParser = XmlPullParserFactory.newInstance().newPullParser();                     //第二种写法                     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);                                     }                                     break;                             }                             event = pullParser.next();                     }                                       return persons;             }                       /**              * 保存数据到XML文件中              * @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(); //得到序列化器                     serializer.setOutput(out, "UTF-8");                     serializer.startDocument("UTF-8", true); //true--是否该文件单独存在                   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();             }     }

单元测试：

package cn.itcast.test;       import java.io.File;     import java.io.FileOutputStream;     import java.io.InputStream;     import java.util.ArrayList;     import java.util.Iterator;     import java.util.List;       import cn.itcast.domain.Person;     import cn.itcast.service.PersonService;     import android.test.AndroidTestCase;     import android.util.Log;       public class PersonServiceTest extends AndroidTestCase{             private static final String TAG = "PersonServiceTest";                       public void testPersons() throws Exception{                     InputStream xml = this.getClass().getClassLoader().getResourceAsStream("person.xml");                     List<Person> persons = PersonService.getPerson(xml);                     for(Person person : persons){                             Log.i(TAG, person.toString());                     }             }                       public void testSave() throws Exception{                     List<Person> persons = new ArrayList<Person>();                     persons.add(new Person(1, "zhangsan", 80));                     persons.add(new Person(2, "lisi", 43));                     persons.add(new Person(3, "wangwu", 12));                     //<包> ///file                     File xmlFile = new File(getContext().getFilesDir(), "itcast.xml");                     FileOutputStream outStream = new FileOutputStream(xmlFile);                                       PersonService.save(persons, outStream);             }     }

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