谁能帮我用pull解析这段xml

xml文件如下，解析大概方法有下面，只是会报错，请帮我在XmlPullParser.START_TAG:下面完善一下。我运行可以的话，就给分了，多谢了！

<?xml version="1.0" encoding="utf-8"?>

<asResponse>
<commands>
<args>ooka</args>
<args>http://xiaoi.cc.cn/robot/as/20151617</args>
<args>http://xiaoi.cc.cn/robot/as/20151614</args>
<name>amsg</name>
<state>1</state>
</commands>
<moduleId>core</moduleId>
<nodeId>asddf0d1a8050062e2</nodeId>
<similarity>4.0</similarity>
<type>1</type>
</asResponse>

解析错误的方法：
public static RobotMessage parse(String xml)
{
RobotMessage robotMessage = null;
try
{
StringReader sr = new StringReader(xml);
XmlPullParser xmlPullParser = Xml.newPullParser();
xmlPullParser.setInput(sr);
int eventType = xmlPullParser.getEventType();
ArrayList<String> args = new ArrayList<String>();
while (eventType != XmlPullParser.END_DOCUMENT)
{
String element;
switch (eventType)
{
case XmlPullParser.START_DOCUMENT:
robotMessage = new RobotMessage();
break;
case XmlPullParser.START_TAG:
{
element = xmlPullParser.getName();
if (element.equalsIgnoreCase("args"))
{
args.add(xmlPullParser.nextText());
}
else if (element.equalsIgnoreCase("name"))
{
args.add(xmlPullParser.nextText());
robotMessage.setCommands(args);
}
else if (element.equalsIgnoreCase("moduleId"))
{
String moduleId = xmlPullParser.nextText();
robotMessage.setModuleId(moduleId);
} else if (element.equalsIgnoreCase("nodeId"))
{
String nodeId = xmlPullParser.nextText();
robotMessage.setNodeId(nodeId);
} else if (element.equalsIgnoreCase("similarity"))
{
String similarity = xmlPullParser.nextText();
robotMessage.setSimilarity(similarity);
} else if (element.equalsIgnoreCase("type"))
{
String type = xmlPullParser.nextText();
robotMessage.setType(type);
}
}
break;
}
eventType = xmlPullParser.next();
}
} catch (Exception ex)
{
ex.printStackTrace();
}
return robotMessage;
}