//1.第一步，创建解析工厂
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
//设置支持命名空间
factory.setNamespaceAware(true);
//2.生成parser对象     
XmlPullParser parser = factory.newPullParser();
//3.设置输入
parser.setInput(new StringReader("<?xml version=\"1.0\" ?><poem><title>静夜思</title><author>李白</author><content>床前明月光，疑似地上霜，举头忘明月，低头思故乡</content></poem>"));
//获取输入类型
int eventType = parser.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT)
 {
   if (eventType == XmlPullParser.START_DOCUMENT) {
  Log.d("tag", "----"+parser.getName());
  }
   if (eventType == XmlPullParser.START_TAG) {
  Log.d("tag", "----"+parser.getName());
  }
   if (eventType == XmlPullParser.TEXT) {
  Log.d("tag", "----"+parser.getText());
  }
   if (eventType == XmlPullParser.END_TAG) {
  Log.d("tag", "----"+parser.getName());
  }
  //不断的去更新
  eventType = parser.next();
 }

package com.android.xiong.documentpullxml; 
 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.util.LinkedHashMap; 
 
import org.xmlpull.v1.XmlPullParser; 
import org.xmlpull.v1.XmlPullParserException; 
import org.xmlpull.v1.XmlPullParserFactory; 
 
import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.DialogInterface; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.TextView; 
 
public class MainActivity extends Activity { 
 
  TextView showtxt; 
  Button btshow; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    showtxt = (TextView) findViewById(R.id.showtxt); 
    btshow = (Button) findViewById(R.id.showxml); 
    btshow.setOnClickListener(new OnClickListener() { 
       
      @Override 
      public void onClick(View v) { 
        GetBaiduXmlBooks baiduxml=new GetBaiduXmlBooks(); 
        baiduxml.execute("http://bcs.duapp.com/meinvlook/books.xml"); 
      } 
    }); 
  } 
 
  // 异步任务 
  class GetBaiduXmlBooks extends 
      AsyncTask<String, Integer, LinkedHashMap<String, String>> { 
 
    ProgressDialog progress; 
 
    // 初始化ProgressDialog 
    @Override 
    protected void onPreExecute() { 
      progress = new ProgressDialog(MainActivity.this); 
      progress.setTitle("提示！"); 
      progress.setMessage("正在解析百度云存储的XML"); 
      progress.setCanceledOnTouchOutside(false); 
      progress.setButton(ProgressDialog.BUTTON_NEUTRAL, "取消", 
          new DialogInterface.OnClickListener() { 
 
            @Override 
            public void onClick(DialogInterface dialog, int which) { 
              // 取消任务 
              GetBaiduXmlBooks.this.cancel(true); 
              progress.dismiss(); 
            } 
          }); 
      progress.show(); 
    } 
 
    // 进行耗时操作 
    @Override 
    protected LinkedHashMap<String, String> doInBackground(String... params) { 
      String xmurl = params[0]; 
      LinkedHashMap<String, String> map = new LinkedHashMap<String, String>(); 
      URL url; 
      try { 
        url = new URL(xmurl); 
        HttpURLConnection connection = (HttpURLConnection) url 
            .openConnection(); 
        connection.setConnectTimeout(10000); 
        connection.setRequestMethod("GET"); 
        InputStream instream = connection.getInputStream(); 
        // 获取xml解析器 
        XmlPullParser parser = XmlPullParserFactory.newInstance() 
            .newPullParser(); 
        parser.setInput(instream, "UTF-8"); 
        int type=parser.getEventType(); 
        //开始解析xml文件 
        while (type!= XmlPullParser.END_DOCUMENT) { 
          if (type == XmlPullParser.START_TAG) { 
            // 获取开始标签 
            if (parser.getName().equals("书名")) { 
              //获取节点的值 
              map.put("书名", parser.nextText()); 
            } 
            if (parser.getName().equals("价格")) { 
              map.put("价格", parser.nextText()); 
            } 
            if (parser.getName().equals("作者")) { 
              map.put("作者", parser.nextText()); 
            } 
            if (parser.getName().equals("性别")) { 
              map.put("性别", parser.nextText()); 
            } 
            if (parser.getName().equals("年龄")) { 
              map.put("年龄",parser.nextText()); 
            } 
          } 
          type=parser.next(); 
        } 
      } catch (IOException e) { 
        e.printStackTrace(); 
      } catch (XmlPullParserException e) { 
        e.printStackTrace(); 
      } 
      return map; 
    } 
 
    @Override 
    protected void onPostExecute(LinkedHashMap<String, String> result) { 
 
      for (String txt : result.keySet()) { 
        showtxt.append(txt+":"+result.get(txt)+"\n"); 
      } 
      progress.dismiss(); 
       
    } 
 
  } 
 
  @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; 
  } 
 
} 

<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=".MainActivity" > 
   
  <Button  
    android:id="@+id/showxml" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/btshowxml"/> 
 
  <TextView 
    android:id="@+id/showtxt" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" /> 
 
</LinearLayout> 

<!-- 获取网络权限 --> 
<uses-permission android:name="android.permission.INTERNET"/>