Android 解析XML—pull解析方式

在Android中，常见的XML解析器分别为SAX解析器、DOM解析器和PULL解析器,其中PULL解析器小巧轻便，解析速度快，简单易用，非常适合在Android移动设备中使用，Android系统内部在解析各种XML时也是用PULL解析器，今天我来介绍一下PULL解析器

首先是在Tomcat服务器上建了一个xml的文档具体如下：

通过访问网络与服务器的交互。

下面是具体的代码：

 package com.hb.xml;

 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;

 import org.xmlpull.v1.XmlPullParser;

 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.util.Xml;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;
 import android.widget.Toast;

 public class MainActivity extends Activity {
     protected static final int NUMBER = 0;
     protected static final int LOCATION = 1;
     protected static final int PHONEJX = 2;
     protected static final int NO = 3;
     private Button bt_start;
     private TextView tv_desc;
     private TextView tv_number;
     private TextView tv_for;
     private String path;
     private XmlPullParser xml;
     private Handler handler=new Handler(){
         public void handleMessage(android.os.Message msg) {
             switch (msg.what) {
             case NUMBER:
                 tv_number.setText((String)msg.obj);
                 Toast.makeText(MainActivity.this, "测试成功", 0).show();
                 break;
             case LOCATION:
                 tv_for.setText((String)msg.obj);
                 Toast.makeText(MainActivity.this, "测试成功", 0).show();
                 break;
             case PHONEJX:
                 tv_desc.setText((String)msg.obj);
                 Toast.makeText(MainActivity.this, "测试成功", 0).show();
                 break;
             case NO:
                 Toast.makeText(MainActivity.this, "测试失败", 0).show();
                 break;
             }
         };
     };

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         initView();
     }

     private void initView() {
         bt_start=(Button) findViewById(R.id.bt_start);
         tv_desc=(TextView) findViewById(R.id.tv_desc);
         tv_number=(TextView) findViewById(R.id.tv_number);
         tv_for=(TextView) findViewById(R.id.tv_for);
     }
     public void testtesting(View v){
         new Thread(){

             public void run() {
                 try {
                     URL url = new URL("http://192.168.1.104:8080/test.xml");
                     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                     conn.setConnectTimeout(3000);
                     conn.setRequestMethod("GET");
                     int code = conn.getResponseCode();
                     if(code==200){

                         InputStream is = conn.getInputStream();
                         xml = Xml.newPullParser();
                         xml.setInput(is, "gbk");
                         int type = xml.getEventType();
                         while (type!=XmlPullParser.END_DOCUMENT) {
                             if(type == XmlPullParser.START_TAG){
                                 if("phonenum".equals(xml.getName())){
                                     String phonenum=xml.nextText();
                                     Message msg= new Message();
                                     msg.what=NUMBER;
                                     msg.obj=phonenum;
                                     handler.sendMessage(msg);
                                 }else if("location".equals(xml.getName())){
                                     String location=xml.nextText();
                                     Message msg= new Message();
                                     msg.what=LOCATION;
                                     msg.obj=location;
                                     handler.sendMessage(msg);
                                 }else if("phoneJx".equals(xml.getName())){
                                     String desc=xml.nextText();
                                     Message msg= new Message();
                                     msg.what=PHONEJX;
                                     msg.obj=desc;
                                     handler.sendMessage(msg);
                                 }
                             }else{
                                 //测试失败
                             }
                             type=xml.next();
                         }
                     }
                 } catch (Exception e) {
                     e.printStackTrace();
                     Message msg= new Message();
                     msg.what=NO;
                     handler.sendMessage(msg);
                 }
             };
         }.start();
     }
 }

最后别忘记添加访问网络的权限：

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

简单的布局：

 <LinearLayout 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:orientation="vertical"
     tools:context="${relativePackage}.${activityClass}" >

     <Button
         android:id="@+id/bt_start"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center_horizontal"
         android:onClick="testtesting"
         android:text="测试" />

     <TextView
         android:id="@+id/tv_number"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="内容"
         android:textColor="#F4A460" />

     <TextView
         android:id="@+id/tv_for"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="信息"
         android:textColor="#99FF33" />
      <TextView
         android:id="@+id/tv_desc"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="描述"
         android:textColor="#EE30A7" />

 </LinearLayout>

源码下载地址：http://pan.baidu.com/s/1geBFWLd