Android Pull解析xml(轉)

Pull解析和Sax解析很相似，都是輕量級的解析，在Android的內核中已經嵌入了Pull，所以我們不需要再添加第三方jar包來支持Pull。Pull解析和Sax解析不一樣的地方有(1)pull讀取xml文件後觸發相應的事件調用方法返回的是數字(2)pull可以在程序中控制想解析到哪裏就可以停止解析。看實例：

book.xml如下：

<?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>

<?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>

 

Pull解析的代碼如下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<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();//產生第一個事件
        while(event!=XmlPullParser.END_DOCUMENT){
            switch(event){
            case XmlPullParser.START_DOCUMENT://判斷當前事件是否是文檔開始事件
                books = new ArrayList<Book>();//初始化books集合
                break;
            case XmlPullParser.START_TAG://判斷當前事件是否是標籤元素開始事件
                if("book".equals(parser.getName())){//判斷開始標籤元素是否是book
                    book = new Book();
                    book.setId(Integer.parseInt(parser.getAttributeValue(0)));//得到book標籤的屬性值，並設置book的id
                }
                if(book!=null){
                    if("name".equals(parser.getName())){//判斷開始標籤元素是否是name
                        book.setName(parser.nextText());
                    }else if("price".equals(parser.getName())){//判斷開始標籤元素是否是price
                        book.setPrice(Float.parseFloat(parser.nextText()));
                    }
                }
                break;
            case XmlPullParser.END_TAG://判斷當前事件是否是標籤元素結束事件
                if("book".equals(parser.getName())){//判斷結束標籤元素是否是book
                    books.add(book);//將book添加到books集合
                    book = null;
                }
                break;
            }
            event = parser.next();//進入下一個元素並觸發相應事件
        }//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<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();//產生第一個事件 while(event!=XmlPullParser.END_DOCUMENT){ switch(event){ case XmlPullParser.START_DOCUMENT://判斷當前事件是否是文檔開始事件 books = new ArrayList<Book>();//初始化books集合 break; case XmlPullParser.START_TAG://判斷當前事件是否是標籤元素開始事件 if("book".equals(parser.getName())){//判斷開始標籤元素是否是book book = new Book(); book.setId(Integer.parseInt(parser.getAttributeValue(0)));//得到book標籤的屬性值，並設置book的id } if(book!=null){ if("name".equals(parser.getName())){//判斷開始標籤元素是否是name book.setName(parser.nextText()); }else if("price".equals(parser.getName())){//判斷開始標籤元素是否是price book.setPrice(Float.parseFloat(parser.nextText())); } } break; case XmlPullParser.END_TAG://判斷當前事件是否是標籤元素結束事件 if("book".equals(parser.getName())){//判斷結束標籤元素是否是book books.add(book);//將book添加到books集合 book = null; } break; } event = parser.next();//進入下一個元素並觸發相應事件 }//end while return books; } }

 裏面使用到的Book.java類

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; } }

 測試使用的是android的單元測試，代碼如下：

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

 要使用android的單元測試，需要在AndroidManifest.xml文件中加入聲明，AndroidManifest.xml如下：

<?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>

<?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>