android中如何解析XML文件

XmlPullParserFactory    fac   = new XmlPullParserFactory.newInstance();

XmlPullParse  parser  =  fac.newPullParser();

parser.setInput(is,"utf-8");

int type = parser.getEventType();

while(type!=XmlPullParser.END_DOCUMENT){

     switch(type){

             case XmlPullParser.START_TAG:

                ............

                parser.getAttributeValue(0);

              ..............

             break;

          case  XmlPullParser.END_TAG:

           ................

           break;

           }

    type = parser.next();

}