clipToPadding 定义了是否允许父控件在padding中绘制, 默认为true, 即不允许.
android:clipToPadding属性的分析——以ListView的"别样"padding为例
http://blog.youkuaiyun.com/lfdfhl/article/details/38051815
扩展:
Padding与绘制区域--android:clipToPadding和android:clipChildren
http://blog.youkuaiyun.com/hpu_zyh/article/details/44520949
http://fatsoon.com/android/2015/01/21/clip-to-padding.html