Android中用pull解析与保存xml文件

需要解析的xml文件
<?xml version="1.0" encoding="utf-8"?>
<helps>
	<help>	
		<id>1</id>	
		<name>动物</name> 
		<type>1</type> 
		<picPath>/gfive/index/index_image1.png</picPath> 
	</help>
	<help>		
		<id>2</id>	
		<name>植物</name> 
		<type>2</type> 
		<picPath>/gfive/index/index_image2.png</picPath> 
	</help>
	<help>		
		<id>3</id>	
		<name>人物</name> 
		<type>3</type> 
		<picPath>/gfive/index/index_image3.png</picPath> 
	</help>
</helps>

　　

package com.gfive.help;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import com.gfive.help.tools.Tools;

import android.content.Context;
import android.util.Xml;


/**
 * 帮助类首页实体类
 * @author Administrator
 */
public class HelpBean implements Serializable {
	
	private static final long serialVersionUID = 1L;
	public static final String HELP = "help";
	public static final String ID = "id";
	public static final String NAME = "name";
	public static final String PIC_PATH = "picPath";
	
	public String id;					//编号
	public String name;				//名字
	public String type;				//图片类型 
	public String picPath;			//图片
	
	private static final String INDEX_PATH = "/gfive/index/"; //导航页的图片

	
	/**
	 * pull 解析xml文件流
	 * @param is
	 * @return
	 */
	public static List<HelpBean> getHelps(InputStream is) {
		List<HelpBean> list = null;
		HelpBean help = null;
		XmlPullParser parser = Xml.newPullParser();
		int event = -1;
		try {
			parser.setInput(is, "UTF-8");
			event = parser.getEventType();
			while (event != XmlPullParser.END_DOCUMENT) {
				switch (event) {
				case XmlPullParser.START_DOCUMENT:
					list = new ArrayList<HelpBean>();
					break;
				case XmlPullParser.START_TAG:
					if (HelpBean.HELP.equals(parser.getName())) {// 得到指针所指向的节点名称
						help = new HelpBean();
					}
					if (help != null) {
						if (HelpBean.ID.equals(parser.getName())) {
							String id = parser.nextText();
							help.id = id;
						}else if (HelpBean.NAME.equals(parser.getName())) {
							String name = parser.nextText();
							help.name = name;
						} else if (HelpBean.PIC_PATH.equals(parser.getName())) {
							String picPath = parser.nextText();
							help.picPath = picPath;
						}
					}
					break;
				case XmlPullParser.END_TAG:
					if (HelpBean.HELP.equals(parser.getName())) {
						list.add(help);
						help = null;
					}
					break;
				default:
					break;
				}
				event = parser.next();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return list;
	}
	
	
	/**
	 * 读取Assert目录下的文件
	 * @param context
	 * @return
	 */
	public static  List<HelpBean> readAssertXml(Context context){
		List<HelpBean> lists = new ArrayList<HelpBean>();
		InputStream is = null;
		try {
			is = context.getResources().getAssets().open("help.xml");
			lists.addAll(HelpBean.getHelps(is));
		} catch (IOException e) {
			e.printStackTrace();
		}finally{
			try {
				if(null != is)
					is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return lists;
	}
	
	/**
	 * 读取SD卡下的文件
	 * @param context
	 * @return
	 */
	public static  List<HelpBean> readSDCardXml(Context context){
		List<HelpBean> lists = new ArrayList<HelpBean>();
		InputStream is = null;
		try {
			File file = new File(Tools.SDCARD_STORAGE_PATH+INDEX_PATH+"help.xml");
			if(file.exists()){
				is = new FileInputStream(file);
				lists.addAll(HelpBean.getHelps(is));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			try {
				if(null != is)
					is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return lists;
	}
}

　保存数据

public static void save(List<Persion> list,OutputStream os) throws IllegalArgumentException, IllegalStateException, IOException{ 
XmlSerializer serializer = Xml.newSerializer(); 
serializer.setOutput(os, "UTF-8"); 
serializer.startDocument("UTF-8", true); 
serializer.startTag(null, "persons"); 
for(Persion persion : list){ 
serializer.startTag(null, "person"); 
serializer.attribute(null, "id", String.valueOf(persion.getId())); 
serializer.startTag(null, "name"); 
serializer.text(persion.getName()); 
serializer.endTag(null, "name"); 
serializer.startTag(null, "age"); 
serializer.text(String.valueOf(persion.getAge())); 
serializer.endTag(null, "age"); 
serializer.endTag(null, "person"); 
} 
serializer.endTag(null, "persons"); 
serializer.endDocument(); 
os.flush(); 
os.close(); 
} 
}