测试代码:

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?><msg serviceID="1" templateID="1" action="web" brief="侠客行论坛" sourceMsgId="0" url=" " flag="0" adverSign="0" multiMsgFlag="0"><item layout="2" advertiser_id="0" aid="0"><picture cover="http://gchat.qpic.cn/gchatpic_new/0/0-0-C235947FE1502AB6A4D188631C0A02F7/0?term=2" w="0" h="0" /><title>侠客行论坛</title><summary>104a.cn</summary></item><source name="" icon="" action="" appid="0" /></msg>

以下蓝色字表示【item layout变化】