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安卓怎么获取xml中的元素数组

分类: IT文章 • 2024-12-26 10:38:43
安卓如何获取xml中的元素数组？
xml文件在服务器，
This XML file does not appear to have any style information associated with it. The document tree is shown below.

<music>

<song>

<id>1</id>

<title>Someone Like You</title>

<artist>Adele</artist>

<duration>4:47</duration>

<thumb_url>http://api.androidhive.info/music/images/adele.png</thumb_url>

</song>

<song>

<id>2</id>

<title>Space Bound</title>

<artist>Eminem</artist>

<duration>4:38</duration>

<thumb_url>

http://api.androidhive.info/music/images/eminem.png

</thumb_url>

</song>

<song>

<id>3</id>

<title>Stranger In Moscow</title>

<artist>Michael Jackson</artist>

<duration>5:44</duration>

<thumb_url>http://api.androidhive.info/music/images/mj.png</thumb_url>

</song>

<song>

<id>4</id>

<title>Love The Way You Lie</title>

<artist>Rihanna</artist>

<duration>4:23</duration>

<thumb_url>

http://api.androidhive.info/music/images/rihanna.png

</thumb_url>

</song>

<song>

<id>5</id>

<title>Khwaja Mere Khwaja</title>

<artist>A R Rehman</artist>

<duration>6:58</duration>

<thumb_url>

http://api.androidhive.info/music/images/arrehman.png

</thumb_url>

</song>

<song>

<id>6</id>

<title>All My Days</title>

<artist>Alexi Murdoch</artist>

<duration>4:47</duration>

<thumb_url>

http://api.androidhive.info/music/images/alexi_murdoch.png

</thumb_url>

</song>

<song>

<id>7</id>

<title>Life For Rent</title>

<artist>Dido</artist>

<duration>3:41</duration>

<thumb_url>http://api.androidhive.info/music/images/dido.png</thumb_url>

</song>

<song>

<id>8</id>

<title>Love To See You Cry</title>

<artist>Enrique Iglesias</artist>

<duration>4:07</duration>

<thumb_url>

http://api.androidhive.info/music/images/enrique.png

</thumb_url>

</song>

<song>

<id>9</id>

<title>The Good, The Bad And The Ugly</title>

<artist>Ennio Morricone</artist>

<duration>2:42</duration>

<thumb_url>http://api.androidhive.info/music/images/ennio.png</thumb_url>

</song>

<song>

<id>10</id>

<title>Show me the meaning</title>

<artist>Backstreet Boys</artist>

<duration>3:56</duration>

<thumb_url>

http://api.androidhive.info/music/images/backstreet_boys.png

</thumb_url>

</song>

<song>

<id>11</id>

<title>Someone Like You</title>

<artist>Adele</artist>

<duration>4:47</duration>

<thumb_url>http://api.androidhive.info/music/images/adele.png</thumb_url>

</song>

<song>

<id>12</id>

<title>Space Bound</title>

<artist>Eminem</artist>

<duration>4:38</duration>

<thumb_url>

http://api.androidhive.info/music/images/eminem.png

</thumb_url>

</song>

<song>

<id>13</id>

<title>Stranger In Moscow</title>

<artist>Michael Jackson</artist>

<duration>5:44</duration>

<thumb_url>http://api.androidhive.info/music/images/mj.png</thumb_url>

</song>

<song>

<id>14</id>

<title>Love The Way You Lie</title>

<artist>Rihanna</artist>

<duration>4:23</duration>

<thumb_url>

http://api.androidhive.info/music/images/rihanna.png

</thumb_url>

</song>

<song>

<id>15</id>

<title>Khwaja Mere Khwaja</title>

<artist>A R Rehman</artist>

<duration>6:58</duration>

<thumb_url>

http://api.androidhive.info/music/images/arrehman.png

</thumb_url>

</song>

<song>

<id>16</id>

<title>All My Days</title>

<artist>Alexi Murdoch</artist>

<duration>4:47</duration>

<thumb_url>

http://api.androidhive.info/music/images/alexi_murdoch.png

</thumb_url>

</song>

<song>

<id>17</id>

<title>Life For Rent</title>

<artist>Dido</artist>

<duration>3:41</duration>

<thumb_url>http://api.androidhive.info/music/images/dido.png</thumb_url>

</song>

<song>

<id>18</id>

<title>Love To See You Cry</title>

<artist>Enrique Iglesias</artist>

<duration>4:07</duration>

<thumb_url>

http://api.androidhive.info/music/images/enrique.png

</thumb_url>

</song>

<song>

<id>19</id>

<title>The Good, The Bad And The Ugly</title>

<artist>Ennio Morricone</artist>

<duration>2:42</duration>

<thumb_url>http://api.androidhive.info/music/images/ennio.png</thumb_url>

</song>

<song>

<id>20</id>

<title>Show me the meaning</title>

<artist>Backstreet Boys</artist>

<duration>3:56</duration>

<thumb_url>

http://api.androidhive.info/music/images/backstreet_boys.png

</thumb_url>

</song>

<song>

<id>21</id>

<title>Someone Like You</title>

<artist>Adele</artist>

<duration>4:47</duration>

<thumb_url>http://api.androidhive.info/music/images/adele.png</thumb_url>

</song>

<song>

<id>22</id>

<title>Space Bound</title>

<artist>Eminem</artist>

<duration>4:38</duration>

<thumb_url>

http://api.androidhive.info/music/images/eminem.png

</thumb_url>

</song>

<song>

<id>23</id>

<title>Stranger In Moscow</title>

<artist>Michael Jackson</artist>

<duration>5:44</duration>

<thumb_url>http://api.androidhive.info/music/images/mj.png</thumb_url>

</song>

<song>

<id>24</id>

<title>Love The Way You Lie</title>

<artist>Rihanna</artist>

<duration>4:23</duration>

<thumb_url>

http://api.androidhive.info/music/images/rihanna.png

</thumb_url>

</song>

<song>

<id>25</id>

<title>Khwaja Mere Khwaja</title>

<artist>A R Rehman</artist>

<duration>6:58</duration>

<thumb_url>

http://api.androidhive.info/music/images/arrehman.png

</thumb_url>

</song>

<song>

<id>26</id>

<title>All My Days</title>

<artist>Alexi Murdoch</artist>

<duration>4:47</duration>

<thumb_url>

http://api.androidhive.info/music/images/alexi_murdoch.png

</thumb_url>

</song>

<song>

<id>27</id>

<title>Life For Rent</title>

<artist>Dido</artist>

<duration>3:41</duration>

<thumb_url>http://api.androidhive.info/music/images/dido.png</thumb_url>

</song>

<song>

<id>28</id>

<title>Love To See You Cry</title>

<artist>Enrique Iglesias</artist>

<duration>4:07</duration>

<thumb_url>

http://api.androidhive.info/music/images/enrique.png

</thumb_url>

</song>

<song>

<id>29</id>

<title>The Good, The Bad And The Ugly</title>

<artist>Ennio Morricone</artist>

<duration>2:42</duration>

<thumb_url>http://api.androidhive.info/music/images/ennio.png</thumb_url>

</song>

<song>

<id>30</id>

<title>Show me the meaning</title>

<artist>Backstreet Boys</artist>

<duration>3:56</duration>

<thumb_url>

http://api.androidhive.info/music/images/backstreet_boys.png

</thumb_url>

</song>

</music>
安卓获取<thumb_url></thumb_url>中的元素数组怎么写？
------解决思路----------------------
1：首先，定义实体类Song
package com.example.androiddemo;


public class Song {


	String id;

	String title;

	String artist;

	String duration;

	String thumb_url;


	@Override

	public String toString() {

		return "id="+id+",title="+title+",artist="+artist+",duration="+duration+",thumb_url="+thumb_url;

	}


	public String getId() {

		return id;

	}

	public void setId(String id) {

		this.id = id;

	}

	public String getTitle() {

		return title;

	}

	public void setTitle(String title) {

		this.title = title;

	}

	public String getArtist() {

		return artist;

	}

	public void setArtist(String artist) {

		this.artist = artist;

	}

	public String getDuration() {

		return duration;

	}

	public void setDuration(String duration) {

		this.duration = duration;

	}

	public String getThumb_url() {

		return thumb_url;

	}

	public void setThumb_url(String thumb_url) {

		this.thumb_url = thumb_url;

	}



}

2：定义接口
package com.example.androiddemo;


import java.io.InputStream;

import java.util.List;


public interface RootParser {


	/**

	 * 解析输入流

	 * @param stream

	 * @return

	 * @throws Exception

	 */

	public List<Song> parse(InputStream stream)throws Exception;


	/**

	 * 序列化Song对象

	 * @param song

	 * @return

	 * @throws Exception

	 */

	public String serialize(List<Song> song)throws Exception;


}

3：具体实现接口
package com.example.androiddemo;


import java.io.InputStream;

import java.io.StringWriter;

import java.util.ArrayList;

import java.util.List;


import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Result;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.sax.SAXTransformerFactory;

import javax.xml.transform.sax.TransformerHandler;

import javax.xml.transform.stream.StreamResult;


import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.AttributesImpl;

import org.xml.sax.helpers.DefaultHandler;


public class SongParser implements RootParser{


	@Override

	public List<Song> parse(InputStream stream) throws Exception {

		SAXParserFactory factory = SAXParserFactory.newInstance();//取得SAXParserFactory实例  

        SAXParser parser = factory.newSAXParser();//从factory获取SAXParser实例  

        MyHandler handler = new MyHandler();//实例化自定义Handler  

        parser.parse(stream, handler);//根据自定义Handler规则解析输入流

        return handler.getSong();

	}


	@Override

	public String serialize(List<Song> song) throws Exception {

		SAXTransformerFactory factory = (SAXTransformerFactory) TransformerFactory.newInstance();//取得SAXTransformerFactory实例

		TransformerHandler handler = factory.newTransformerHandler();//从factory获取TransformerHandler实例

		Transformer transformer = handler.getTransformer();//从handler获取Transformer实例

		transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");// 设置输出采用的编码方式

		transformer.setOutputProperty(OutputKeys.INDENT, "yes");// 是否自动添加额外的空白

		transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");// 是否忽略XML声明  


		StringWriter writer = new StringWriter();  

        Result result = new StreamResult(writer);  

        handler.setResult(result);

        

        String uri = "";    //代表命名空间的URI 当URI无值时 须置为空字符串  

        String localName = "";  //命名空间的本地名称(不包含前缀) 当没有进行命名空间处理时 须置为空字符串

        

        handler.startDocument();  

        handler.startElement(uri, localName, "music", null);

        

        AttributesImpl attrs = new AttributesImpl();    //负责存放元素的属性信息

        char[] ch = null;

        for(Song singleSong:song){

        	attrs.clear();  //清空属性列表

        	attrs.addAttribute(uri, localName, "id", "string", singleSong.getId());//添加一个名为id的属性

        	

        	handler.startElement(uri, localName, "song", attrs);    //开始一个song元素 关联上面设定的id属性

        	

        	handler.startElement(uri, localName, "title", null); //开始一个title元素 没有属性  

        	ch = singleSong.getTitle().toCharArray();

        	handler.characters(ch, 0, ch.length);   //设置title元素的文本节点

        	handler.endElement(uri, localName, "title"); 

        	

        	handler.startElement(uri, localName, "artist", null); //开始一个artist元素 没有属性  

        	ch = singleSong.getTitle().toCharArray();

        	handler.characters(ch, 0, ch.length);   //设置artist元素的文本节点

        	handler.endElement(uri, localName, "artist"); 

        	

        	handler.startElement(uri, localName, "duration", null); //开始一个duration元素 没有属性  

        	ch = singleSong.getTitle().toCharArray();

        	handler.characters(ch, 0, ch.length);   //设置duration元素的文本节点

        	handler.endElement(uri, localName, "duration"); 

        	

        	handler.startElement(uri, localName, "thumb_url", null); //开始一个thumb_url元素 没有属性  

        	ch = singleSong.getTitle().toCharArray();

        	handler.characters(ch, 0, ch.length);   //设置thumb_url元素的文本节点

        	handler.endElement(uri, localName, "thumb_url"); 

        	

        }

        handler.endElement(uri, localName, "music");

        handler.endDocument(); 

		return writer.toString();

	}


	/**

	 * 需要重写DefaultHandler的方法 

	 * @author luosiye

	 *

	 */

	private class MyHandler extends DefaultHandler {


		private List<Song> songs;

		private Song song;

		private StringBuilder builder;


		public List<Song> getSong(){

			return songs;

		}


		@Override

		public void startDocument() throws SAXException {

			super.startDocument();

			songs = new ArrayList<Song>();

			builder = new StringBuilder();

		}


		@Override

		public void startElement(String uri, String localName, String qName,

				Attributes attributes) throws SAXException {

			super.startElement(uri, localName, qName, attributes);

			if (localName.equals("song")) {  

				song = new Song();  

            }  

			builder.setLength(0);//将字符长度设置为0 以便重新开始读取元素内的字符节点

		}


		@Override

		public void characters(char[] ch, int start, int length)

				throws SAXException {

			super.characters(ch, start, length);

			builder.append(ch, start, length);  //将读取的字符数组追加到builder中

		}


		@Override

		public void endElement(String uri, String localName, String qName)

				throws SAXException {

			super.endElement(uri, localName, qName);

			if (localName.equals("id")) {

				song.setId(builder.toString());

			}else if(localName.equals("title")){

				song.setTitle(builder.toString());

			}else if(localName.equals("artist")){

				song.setArtist(builder.toString());

			}else if(localName.equals("duration")){

				song.setDuration(builder.toString());

			}else if(localName.equals("thumb_url")){

				song.setThumb_url(builder.toString());

			}else if(localName.equals("song")){

				songs.add(song);

			}

		}


	}


}

4：实现调用
package com.example.androiddemo;


import java.io.InputStream;

import java.util.List;


import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;


public class MainActivity extends ActionBarActivity {


	private SongParser parser;

	private List<Song> songs;


	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);


		try {

			InputStream is = getAssets().open("song.xml");

			parser = new SongParser();

			songs = parser.parse(is);

			for(Song song:songs){

				System.out.println(song.toString());

			}

		} catch (Exception e) {

			e.printStackTrace();

		} 


	}


}

运行结果：
安卓怎么获取xml中的元素数组

song.xml文件就是你上面的文件

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