Android基于Pull方式解析xml的方法详解

<?xml version="1.0" encoding="UTF-8"?>
<books>
 <book id="12">
  <name>thinking in java</name>
  <price>85.5</price>
 </book>
 <book id="15">
  <name>Spring in Action</name>
  <price>39.0</price>
 </book>
</books>

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import android.util.Xml;
import com.xtlh.cn.entity.Book;
public class PullParseService {
 public static List<Book> getBooks(InputStream inputStream) throws Exception{
  List<Book> books = null;
  Book book = null;
  XmlPullParser parser = Xml.newPullParser();
  parser.setInput(inputStream, "UTF-8");
  int event = parser.getEventType();//产生第一个事件
  while(event!=XmlPullParser.END_DOCUMENT){
   switch(event){
   case XmlPullParser.START_DOCUMENT://判断当前事件是否是文档开始事件
    books = new ArrayList<Book>();//初始化books集合
    break;
   case XmlPullParser.START_TAG://判断当前事件是否是标签元素开始事件
    if("book".equals(parser.getName())){//判断开始标签元素是否是book
     book = new Book();
     book.setId(Integer.parseInt(parser.getAttributeValue(0)));//得到book标签的属性值，并设置book的id
    }
    if(book!=null){
     if("name".equals(parser.getName())){//判断开始标签元素是否是name
      book.setName(parser.nextText());
     }else if("price".equals(parser.getName())){//判断开始标签元素是否是price
      book.setPrice(Float.parseFloat(parser.nextText()));
     }
    }
    break;
   case XmlPullParser.END_TAG://判断当前事件是否是标签元素结束事件
    if("book".equals(parser.getName())){//判断结束标签元素是否是book
     books.add(book);//将book添加到books集合
     book = null;
    }
    break;
   }
   event = parser.next();//进入下一个元素并触发相应事件
  }//end while
  return books;
 }
}

public class Book {
 private int id;
 private String name;
 private float price;
 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 float getPrice() {
  return price;
 }
 public void setPrice(float price) {
  this.price = price;
 }
 @Override
 public String toString(){
  return this.id+":"+this.name+":"+this.price;
 }
}

import java.io.InputStream;
import java.util.List;
import android.test.AndroidTestCase;
import android.util.Log;
import com.xtlh.cn.entity.Book;
import com.xtlh.cn.service.PullParseService;
public class testPullParseService extends AndroidTestCase{
 private static final String TAG = "testPullParseService";
 public void testPull() throws Exception{
  InputStream input = this.getClass().getClassLoader().getResourceAsStream("book.xml");
  PullParseService pull = new PullParseService();
  List<Book> books = pull.getBooks(input);
  for(Book book : books){
   Log.i(TAG,book.toString());
  }
 }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.xlth.cn.demo"
  android:versionCode="1"
  android:versionName="1.0">
 <application android:icon="@drawable/icon" android:label="@string/app_name">
 <uses-library android:name="android.test.runner" />
  <activity android:name=".PullParseDemo"
     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>
 <uses-sdk android:minSdkVersion="7" />
 <instrumentation android:name="android.test.InstrumentationTestRunner"
  android:targetPackage="com.xlth.cn.demo" android:label="Tests for My App" />
</manifest>