listview.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            Intent it = new Intent(getActivity(), ReleaseDetail.class);
            final SerializableMap myMap = new SerializableMap();
            myMap.setMap(tempList);// 将map数据添加到封装的myMap中
            Bundle bundle = new Bundle();
            bundle.putSerializable("map1", myMap);
            it.putExtras(bundle);
            startActivity(it);
            getActivity().finish();
        }
    });

public class SerializableMap implements Serializable {

private static final long serialVersionUID = 3958588986554810147L;
private Map<String, ReleaseContents> map;

public Map<String, ReleaseContents> getMap() {
    return map;
}

public void setMap(Map<String, ReleaseContents> tempMap) {
    this.map = tempMap;
}

}

ReleaseContents是一个实体类也实现了Serializable 接口还是报以下错误呢！！！

07-12 12:51:58.093: E/AndroidRuntime(12270): java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = XXX.SerializableMap)XXX
查资料说是对象也是要先序列化接口，我ReleaseContents都实现了的呀！请问是哪里错了哦！