02_Android写xml文件和读xml文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.itheima28.xmldemo"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="19" />

<!—用于单元测试—>

<instrumentation

android:name="android.test.InstrumentationTestRunner"

android:targetPackage="com.itheima28.xmldemo">

</instrumentation>

<!—写外设的权限à

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<!—单元测试所需à

<uses-library android:name="android.test.runner"/>

<activity

android:name="com.itheima28.xmldemo.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>

</manifest>

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() {

super();

}

public Person(int id, String name, int age) {

super();

this.id = id;

this.name = name;

this.age = age;

}

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;

}

}

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.ArrayList;

import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlSerializer;

import android.os.Environment;

import android.test.AndroidTestCase;

import android.util.Log;

import android.util.Xml;

import com.itheima28.xmldemo.Person;

public class TestCase extends AndroidTestCase {

/**

* 测试写xml文件

*/

public void testWriteXml() {

writeXmlToLocal();

}

/**

* 测试读xml文件

*/

public void testReadXml() {

List<Person> personList = parseXmlFromLocal();

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();

try {

//测试获得到的位置是：/storage/emulated/0

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");

//写开始<?xml version=‘1.0‘ encoding=‘utf-8‘ standalone=‘yes‘ ?>

serializer.startDocument("utf-8", true);

//<persons>

serializer.startTag(null, "persons");

for (Person person : personList) {

//开始写入

serializer.startTag(null, "person");

serializer.attribute(null, "id", String.valueOf(person.getId()));

//写名字<name>

serializer.startTag(null, "name");

serializer.text(person.getName());

//</name>

serializer.endTag(null, "name");

//写年龄

//<age>

serializer.startTag(null, "age");

serializer.text(String.valueOf(person.getAge()));

//</age>

serializer.endTag(null, "age");

//</persons>

serializer.endTag(null, "person");

}

//</persons>

serializer.endTag(null, "persons");

//结束

serializer.endDocument();

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 用于生成一个List的Person集合

* @return

*/

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;

}

/**

* 解析xml文件并将xml文件中内容写List集合中

* @return

*/

private List<Person> parseXmlFromLocal() {

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();

//指定解析的文件的编码格式

parser.setInput(fis,"utf-8");

//获得时间类型

int eventType = parser.getEventType();

List<Person> personList = null;

Person person = null;

String id;

while (eventType != XmlPullParser.END_DOCUMENT) {

//获取当前节点的名称

String tagName = parser.getName();

switch (eventType) {

//获得当前节点的名称 <person>

case XmlPullParser.START_TAG:

//<persons>

if("persons".equals(tagName)) {

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)) {

person.setName(parser.nextText());

} else if("age".equals(tagName)) { //<age>

person.setAge(Integer.parseInt(parser.nextText()));

}

break;

//</persons>

case XmlPullParser.END_TAG:

if ("person".equals(tagName)) {

//需要把上面设置好的person对象添加到集合中

personList.add(person);

}

break;

default:

break;

}

//获得下一个事件类型

eventType = parser.next();

}

return personList;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

}