关于mars老师音乐播放器xml解析问题！！！

Question

public class Mp3Player extends ListActivity {
/** Called when the activity is first created. */
public final static int UPDATE = 1;
public final static int ABOUT = 2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // TODO Auto-generated method stub
    menu.add(0, UPDATE, 1, R.string.update);
    menu.add(0, ABOUT, 2, R.string.about);
    return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // TODO Auto-generated method stub
    if(item.getItemId() == UPDATE) {
        String xml = downloadXml("http://192.168.254.1:8080/mp3/resouces.xml");
        [size=large][color=red]（1）System.out.println("xml--------"+xml);[/color][/size]         parse(xml);
    }
    else if(item.getItemId() == ABOUT) {

    }
    return super.onOptionsItemSelected(item);
}

public String downloadXml(String urlStr) {
    HttpDownloader download = new HttpDownloader();
    String result = download.download(urlStr);
    return result;
}

public List<Mp3Info> parse(String xmlStr) {
    //创建sax解析器工厂
    SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
    StringReader strR = new StringReader(xmlStr);
    InputSource input = new InputSource(strR);
    System.out.println("xml--------"+xmlStr);
    try {
        XMLReader xmlReader = saxParserFactory.newSAXParser().getXMLReader();
        List<Mp3Info> info = new ArrayList<Mp3Info>();
        Mp3ListContentHandler mp3ListContentHandler = new Mp3ListContentHandler(info);
        xmlReader.setContentHandler(mp3ListContentHandler);
        xmlReader.parse(input);

        [color=red]（2）System.out.println("info size-----------"+info.size());

        （3）for(Iterator iterator = info.iterator(); iterator.hasNext();) {
            Mp3Info mp3Info = (Mp3Info)iterator.next();
            System.out.println("mp3Info-------"+mp3Info);
        }[/color]       } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } 
    return null;

}

}
上面是activity类
(1)处可以输出完整的xml信息
(2)(3)处均不能被执行

public class Mp3ListContentHandler extends DefaultHandler {

private List<Mp3Info> infos = null;
private Mp3Info mp3Info = null;
private String targetName = null;


public Mp3ListContentHandler(List<Mp3Info> infos) {
    super();
    this.infos = infos;
}

public List<Mp3Info> getInfos() {
    return infos;
}

public void setInfos(List<Mp3Info> infos) {
    this.infos = infos;
}

@Override
public void characters(char[] ch, int start, int length)
        throws SAXException {

    String temp = new String(ch, start, length);

    if(targetName.equals("id")) {
        mp3Info.setId(temp);
    }
    else if(targetName.equals("mp3.name")) {
        mp3Info.setMp3Name(temp);
    }
    else if(targetName.equals("mp3.size")) {
        mp3Info.setMp3Size(temp);
    }
    else if(targetName.equals("lrc.name")) {
        mp3Info.setLrcName(temp);
    }
    else if(targetName.equals("lrc.size")) {
        mp3Info.setLrcSize(temp);
    }
}

@Override
public void startDocument() throws SAXException {
    // TODO Auto-generated method stub
    super.startDocument();
}

@Override
[size=large][color=red](1)public void endDocument() throws SAXException {
    // TODO Auto-generated method stub
    System.out.println("endDocument methoed is start-----");
}[/color][/size]    @Override
public void endElement(String uri, String localName, String qName)
        throws SAXException {
    // TODO Auto-generated method stub
    if(qName.equals("resource")) {
        infos.add(mp3Info);
        [size=large][color=red](2)System.out.println("infos is --------"+infos);[/color][/size]     }
    this.targetName = "";       
}

@Override
public void startElement(String uri, String localName, String qName,
        Attributes attributes) throws SAXException {
    // TODO Auto-generated method stub
    this.targetName = localName;
    if(targetName.equals("resource")) {
        mp3Info = new Mp3Info();
    }
}

}
这是处理xml文件的Handler
(1)处方法不能被执行
(2)处可以输出正常信息

小弟被这个问题卡了好几天了，恳求大神们指点指点！

Answer 1

我这边运行mars老师的代码没有问题，你看看你的resouces.xml格式，估计是这个问题