Android Pull解析xml(转)

Pull解析和Sax解析很相似，都是轻量级的解析，在Android的内核中已经嵌入了Pull，所以我们不需要再添加第三方jar包来支持Pull。Pull解析和Sax解析不一样的地方有(1)pull读取xml文件后触发相应的事件调用方法返回的是数字(2)pull可以在程序中控制想解析到哪里就可以停止解析。看实例：

book.xml如下：

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

thinking in java 85.5 Spring in Action 39.0

 

Pull解析的代码如下PullParseService.java

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 getBooks(InputStream inputStream) throws Exception{
        List 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();//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;
    }
}

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 getBooks(InputStream inputStream) throws Exception{ List 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();//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; } }

 里面使用到的Book.java类

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;
    }
}

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; } }

 测试使用的是android的单元测试，代码如下：

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 books = pull.getBooks(input);
        for(Book book : books){
            Log.i(TAG,book.toString());
        }
    }
}

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 books = pull.getBooks(input); for(Book book : books){ Log.i(TAG,book.toString()); } } }

 要使用android的单元测试，需要在AndroidManifest.xml文件中加入声明，AndroidManifest.xml如下：

xml version="1.0" encoding="utf-8"?>
<manifest xmlns: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>

 Pull解析可以用于很多场合，例如接受google天气，rss新闻等，希望对大家有帮助！

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