Android第七个功能：XmlPullParser添加内容保存为XML文件

核心代码五部分：

1、实体类

2、服务类

3、测试类

4、添加测试相关代码在项目配置文件中

5、运行测试，查看结果

package com.dcj.domain;public class Person {private Integer id;private String name;private Integer age;public Integer getId() {return id;}public Person() {super();}public Person(Integer id, String name, Integer age) {super();this.id = id;this.name = name;this.age = age;}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;}@Overridepublic String toString() {return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";}}

package com.dcj.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.XmlSerializer;import com.dcj.domain.Person;import android.util.Xml;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");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();}}

package com.dcj.test;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.util.ArrayList;import java.util.List;import com.dcj.domain.Person;import com.dcj.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.getPersons(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(43, "zhangsan", 80));persons.add(new Person(12, "lili", 20));persons.add(new Person(78, "xiaoxiao", 8));// <包>/files   在当前应用所在包的files文件夹中生成文件File xmlFile = new File(getContext().getFilesDir(), "dcj.xml");FileOutputStream outStream = new FileOutputStream(xmlFile);PersonService.save(persons, outStream);}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.dcj"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="8" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <uses-library android:name="android.test.runner" />        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application><instrumentation        android:name="android.test.InstrumentationTestRunner"        android:targetPackage="com.dcj"         android:label="Test for my App"/>     </manifest>

执行测试方法，会在当前应用下新建一个files文件夹，然后里面有一个dcj.xml，数据如下

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