安卓XML文件解析 characters出问题

Question

解析XML件遇到字符串时public void characters(char[] ch, int start, int length)会调用两次，并且第二次是在endelement后调用的会产生\t\t，刚开始解析也是先调用characters，不是startlement，弄好久了，实在不知道怎么弄了，下面是解析用到的方法

@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
String temp=new String(ch,start,length);
if(tagname.equals("name")){
Mp3content.setName(temp);
}
if(tagname.equals("size")){
Mp3content.setSize(temp);
}
if(tagname.equals("singer")){
Mp3content.setSinger(temp);
}
super.characters(ch, start, length);
}

@Override
public void endDocument() throws SAXException {
    super.endDocument();
}

@Override
public void endElement(String uri, String localName, String qName)
        throws SAXException {
    if(localName=="mp3"){
        System.out.println(localName+"------>2.1");
        System.out.println(Mp3content.getSize()+"----");
        list.add(Mp3content);
        tagname="";
    }
    super.endElement(uri, localName, qName);
}

public myContenthandler() {
    super();
}

@Override
public void startDocument() throws SAXException {

    super.startDocument();
}

@Override
public void startElement(String uri, String localName, String qName,
        Attributes attributes) throws SAXException {
    this.tagname=localName;
    if(localName=="mp3"){
    Mp3content=new mp3content();
    }
    super.startElement(uri, localName, qName, attributes);
}

这是那份XML文件
<?xml version="1.0" encoding="utf-8"?>


rwr
2322
rwdd


utg
865
mfd

还有些错误提示和警告也不知道怎么处理
03-17 10:24:37.946: E/InputDispatcher(70): channel '40748430 com.example.mp3players/com.example.mp3players.Mp3ListActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x8
快来大神帮帮小弟我啊，怎么弄啊