问如何使用XmlPullparser解析嵌套元素？

EN

<?xml version="1.0" encoding="UTF-8"?>
<frames>
<frame>
    <name>FRAME-A</name>
    <coordinatesA>
       <x>75</x>
       <y>75</y>
    </coordinatesA>
    <coordinatesB>
       <x>75</x>
       <y>490</y>
    </coordinatesB>
    <coordinatesC>
       <x>645</x>
       <y>75</y>
   </coordinatesC>
    <coordinatesD>
       <x>1215</x>
       <y>75</y>
    </coordinatesD>
    <coordinatesE>
        <x>0</x>
       <y>0</y>
    </coordinatesE>
    <image>@drawable/frameguideone</image>
</frame>

public class XMLPullParserHandler {
List<Employee> frames;
private Employee frame;
private String text;

public XMLPullParserHandler() {
    frames = new ArrayList<Employee>();
}

public List<Employee> getEmployees() {
    return frames;
}

public List<Employee> parse(InputStream is) {
    XmlPullParserFactory factory = null;
    XmlPullParser parser = null;
    try {
        factory = XmlPullParserFactory.newInstance();
        factory.setNamespaceAware(true);
        parser = factory.newPullParser();

        parser.setInput(is, null);

        int eventType = parser.getEventType();
        while (eventType != XmlPullParser.END_DOCUMENT) {
            String tagname = parser.getName();
            switch (eventType) {
            case XmlPullParser.START_TAG:
                if (tagname.equalsIgnoreCase("frame")) {
                    // create a new instance of employee
                    frame = new Employee();
                }
                break;

            case XmlPullParser.TEXT:
                text = parser.getText();
                break;

            case XmlPullParser.END_TAG:
                if (tagname.equalsIgnoreCase("frame")) {
                    // add employee object to list
                    frames.add(frame);
                } else if (tagname.equalsIgnoreCase("name")) {
                    frame.setName(text);
                } else if (tagname.equalsIgnoreCase("coordinates")) {
                    frame.setCoordinates(Integer.parseInt(text));
                } else if (tagname.equalsIgnoreCase("image")) {
                    frame.setImage(text);
                }else if(tagname.equalsIgnoreCase("x")){
                    frame.setX(Integer.parseInt(text));
                }else if(tagname.equalsIgnoreCase("y")){
                    frame.setY(Integer.parseInt(text));
                }
                break;
            default:
                break;
            }
            eventType = parser.next();
        }

    } catch (XmlPullParserException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return frames;
}