http://blog.csdn.net/wangwei_cq/article/details/9491967
<item> <shape> <gradient android:angle="270" android:endColor="#A8C3B0" android:startColor="#C6CFCE"/> <size android:height="60dp" android:width="320dp" /> <corners android:radius="8dp" /> </shape> </item>
原文：http://www.cnblogs.com/jackping/p/4998352.html