Android解析XML到对象工具类

/**
 * 解析XML工具类
 */
public class XmlUtils {

	/**
	 * 解析XML转换成对象
	 * 
	 * @param is
	 *            输入流
	 * @param clazz
	 *            对象Class
	 * @param fields
	 *            字段集合一一对应节点集合
	 * @param elements
	 *            节点集合一一对应字段集合
	 * @param itemElement
	 *            每一项的节点标签
	 * @return
	 */
	public static List<Object> parse(InputStream is, Class<?> clazz,
			List<String> fields, List<String> elements, String itemElement) {
		Log.v("rss", "开始解析XML.");
		List<Object> list = new ArrayList<Object>();
		try {
			XmlPullParser xmlPullParser = Xml.newPullParser();
			xmlPullParser.setInput(is, "UTF-8");
			int event = xmlPullParser.getEventType();

			Object obj = null;

			while (event != XmlPullParser.END_DOCUMENT) {
				switch (event) {
				case XmlPullParser.START_TAG:
					if (itemElement.equals(xmlPullParser.getName())) {
						obj = clazz.newInstance();
					}
					if (obj != null
							&& elements.contains(xmlPullParser.getName())) {
						setFieldValue(obj, fields.get(elements
								.indexOf(xmlPullParser.getName())),
								xmlPullParser.nextText());
					}
					break;
				case XmlPullParser.END_TAG:
					if (itemElement.equals(xmlPullParser.getName())) {
						list.add(obj);
						obj = null;
					}
					break;
				}
				event = xmlPullParser.next();
			}
		} catch (Exception e) {
			Log.e("rss", "解析XML异常：" + e.getMessage());
			throw new RuntimeException("解析XML异常：" + e.getMessage());
		}
		return list;
	}
	
	/**
	 * 设置字段值
	 * 
	 * @param propertyName
	 *            字段名
	 * @param obj
	 *            实例对象
	 * @param value
	 *            新的字段值
	 * @return
	 */
	public static void setFieldValue(Object obj, String propertyName,
			Object value) {
		try {
			Field field = obj.getClass().getDeclaredField(propertyName);
			field.setAccessible(true);
			field.set(obj, value);
		} catch (Exception ex) {
			throw new RuntimeException();
		}
	}
	
}