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;
	}
	@Override
	public 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