有些时候，我们需要生成一个XML文件，生成XML文件的方法有很多，如：可以只使用一个StringBuilder组拼XML内容，然后把内容写入到文件中；或者使用DOM API生成XML文件，或者也可以使用pull解析器生成XML文件，这里推荐大家使用Pull解析器。
一、布局界面
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/btn_pull"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="110dp"
android:text="@string/btn_pull" />
<Button
android:id="@+id/btn_write"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btn_pull"
android:layout_alignRight="@+id/btn_pull"
android:layout_below="@+id/btn_pull"
android:layout_marginTop="61dp"
android:text="@string/btn_write" />
</RelativeLayout>
二、写一个xml文件
<?xml version="1.0" encoding="UTF-8"?> <persons> <person id="23"> <name>李明</name> <age>30</age> </person> <person id="20"> <name>李向梅</name> <age>25</age> </person> </persons>
三、写一个和xml相对应的bean
package com.example.lession04_pull.domain;
import java.io.Serializable;
public class Person implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private int id;
private String name;
private short 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 short getAge() {
return age;
}
public void setAge(short age) {
this.age = age;
}
public Person(int id, String name, short age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public Person() {
super();
// TODO Auto-generated constructor stub
}
}
四、写一个Pul的服务类
package com.example.lession04_pull.service;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlSerializer;
import android.os.Environment;
import android.util.Xml;
import com.example.lession04_pull.domain.Person;
public class PullXmlService {
public Person currentPerson;
public List<Person> readXml(InputStream is){
//声明返回值
List<Person> persons=null;
//首先利用Xml.newPullParser()获取解析对象
XmlPullParser xmlPullParser=Xml.newPullParser();
try{
// 解析文件
xmlPullParser.setInput(is, "UTF-8");
//获取解析的事件类型
int eventType=xmlPullParser.getEventType();
//判断文件解析的是否完毕
while(eventType!=XmlPullParser.END_DOCUMENT){
switch (eventType) {
case XmlPullParser.START_DOCUMENT:
persons=new ArrayList<Person>();
break;
case XmlPullParser.START_TAG:
String tagName=xmlPullParser.getName();
if("person".equals(tagName)){
//创建person对象
currentPerson=new Person();
currentPerson.setId(Integer.parseInt(xmlPullParser
.getAttributeValue(null, "id")));
}else if("name".equals(tagName)){
currentPerson.setName(xmlPullParser.nextText());
}else if("age".equals(tagName)){
currentPerson.setAge(new Short(xmlPullParser.nextText()));
}
break;
case XmlPullParser.END_TAG:
if("person".equals(xmlPullParser.getName()) && currentPerson!=null){
//把person对象放到集合中去
persons.add(currentPerson);
currentPerson=null;
}
break;
}
eventType=xmlPullParser.next();
}
is.close();
}catch(Exception e){
e.printStackTrace();
}
return persons;
}
// 写入
public boolean write(List<Person> persons) {
// 采用pull解析进行实现
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// 获取sdcard目录 文件对象
File sdCardDir = Environment.getExternalStorageDirectory();
// 创建文件
File file = new File(sdCardDir, "mycsdn.xml");
XmlSerializer serializer = Xml.newSerializer();
FileOutputStream fos = null;
try {
// 根据文件对象创建一个文件的输出流对象
fos = new FileOutputStream(file);
// 设置输出的流及编码
serializer.setOutput(fos, "UTF-8");
// 设置文件的开始
serializer.startDocument("UTF-8", true);
// persons标签开始
serializer.startTag(null, "persons");
for (Person person : persons) {
// person标签的开始
serializer.startTag(null, "person");
// 设置person标签的属性
serializer.attribute("null", "id", person.getId() + "");
// 设置person标签的子标签 name
serializer.startTag(null, "name");
serializer.text(person.getName());
serializer.endTag(null, "name");
// 设置person标签的子标签的age
serializer.startTag(null, "age");
serializer.text(person.getAge() + "");
serializer.endTag(null, "age");
// person标签的结束
serializer.endTag(null, "person");
}
// persons标签的结束
serializer.endTag(null, "persons");
// 文件的结束
serializer.endDocument();
fos.flush();
fos.close();
return true;
} catch (Exception e) {
e.printStackTrace();
}
}
return false;
}
}
五、在MainActivity中调用测试
package com.example.lession04_pull;
import java.util.List;
import com.example.lession04_pull.domain.Person;
import com.example.lession04_pull.service.PullXmlService;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
public Button btn_pull,btn_write;
public PullXmlService pullXmlService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//实例化
pullXmlService=new PullXmlService();
btn_pull=(Button) findViewById(R.id.btn_pull);
btn_write=(Button) findViewById(R.id.btn_write);
btn_pull.setOnClickListener(new MyOnClickListener());
btn_write.setOnClickListener(new MyOnClickListener());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class MyOnClickListener implements View.OnClickListener{
@Override
public void onClick(View v) {
int id=v.getId();
switch (id) {
case R.id.btn_pull:
List<Person> persons=null;
try{
persons=pullXmlService.readXml(getAssets().open("csdn.xml"));
}catch(Exception e){
e.printStackTrace();
}
if(persons!=null){
Toast.makeText(MainActivity.this, "采用pull解析xml文件"+persons.get(0).getName()+"--"+persons.get(1).getName(),
Toast.LENGTH_LONG).show();
}
break;
case R.id.btn_write:
try{
List<Person> pers=pullXmlService.readXml(getAssets().open("csdn.xml"));
//重新生成一个xml文件 mysdcare.xml
boolean flag=pullXmlService.write(pers);
if(flag){
Toast.makeText(MainActivity.this, "采用pull解析生产xml文件成功",
Toast.LENGTH_LONG).show();
}else{
Toast.makeText(MainActivity.this, "采用pull解析生产xml文件失败",
Toast.LENGTH_LONG).show();
}
}catch(Exception e){
e.printStackTrace();
}
break;
}
}
}
}