Android pull解析xml的实现方法

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>  
<persons> 
  <person id="101"> 
    <name>jame</name>  
    <age>18</age>  
  </person> 
  <person id="102"> 
    <name>tom</name>  
    <age>20</age>  
  </person> 
  <person id="103"> 
    <name>jack</name>  
    <age>16</age>  
  </person> 
  <person id="104"> 
    <name>rose</name>  
    <age>26</age>  
  </person> 
</persons> 

<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}" > 
 
  <textview 
    android:id="@+id/tv_content" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/hello_world" /> 
 
  <button 
    android:id="@+id/bt_read" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="读取xml文件" /> 
 
</linearlayout> 

public class person { 
  private int id; 
  private string name; 
  private int age; 
 
  public person() { 
    super(); 
  } 
 
  public person(int id, string name, int age) { 
    super(); 
    this.id = id; 
    this.name = name; 
    this.age = age; 
  } 
 
  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 int getage() { 
    return age; 
  } 
 
  public void setage(int age) { 
    this.age = age; 
  } 
 
  @override 
  public string tostring() { 
    return "person [id=" + id + ", name=" + name + ", age=" + age + "]"; 
  } 
 
} 

import java.io.file; 
import java.io.fileinputstream; 
import java.io.inputstream; 
import java.util.arraylist; 
import java.util.list; 
 
import org.xmlpull.v1.xmlpullparser; 
 
import android.app.activity; 
import android.os.bundle; 
import android.os.environment; 
import android.util.xml; 
import android.view.view; 
import android.view.view.onclicklistener; 
import android.widget.textview; 
 
public class mainactivity extends activity implements onclicklistener { 
 
  private textview tv_content; 
 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.activity_main); 
 
    tv_content = (textview) findviewbyid(r.id.tv_content); 
 
    findviewbyid(r.id.bt_read).setonclicklistener(this); 
 
  } 
 
  @override 
  public void onclick(view v) { 
    try { 
      if (environment.getexternalstoragestate().equals( 
          environment.media_mounted)) { 
 
        list<person> persons = new arraylist<person>(); 
        person person = null; 
 
        file sd_file = environment.getexternalstoragedirectory(); 
        file file = new file(sd_file, "persons.xml"); 
        inputstream inputstream = new fileinputstream(file); 
        // 获取xml pull解析器 
        xmlpullparser pullparser = xml.newpullparser(); 
        // 解析文件 
        pullparser.setinput(inputstream, "utf-8"); 
        // 得到事件类型（start_document,end_document,start_tag, end_tag, text, 
        // etc） 
        int eventtype = pullparser.geteventtype(); 
        while (eventtype != xmlpullparser.end_document) { 
          switch (eventtype) { 
          case xmlpullparser.start_tag: 
            // 获取标签的名称 
            string tag_name = pullparser.getname(); 
            if ("person".equals(tag_name)) { 
              person = new person(); 
              persons.add(person); 
 
              // string value = pullparser.getattributevalue(null, 
              // "id"); 
              string value = pullparser.getattributevalue(0); 
              person.setid(integer.parseint(value)); 
            } else if ("name".equals(tag_name)) { 
              // pullparser.next(); 
              // string text = pullparser.gettext(); 
              string text = pullparser.nexttext(); 
              person.setname(text); 
 
            } else if ("age".equals(tag_name)) { 
              // pullparser.next(); 
              // string text = pullparser.gettext(); 
              string text = pullparser.nexttext(); 
              person.setage(integer.parseint(text)); 
            } 
            break; 
 
          default: 
            break; 
          } 
          eventtype = pullparser.next(); 
        } 
        tv_content.settext(persons.tostring()); 
      } 
    } catch (exception e) { 
      e.printstacktrace(); 
    } 
  } 
}