为什么setBackgroundColor（）仅使用我的自定义主题失败？

I thought I successfully created a striped Android ListView, in which the background colors of the list items alternate. It works perfectly when I use Theme.Holo.Light as my application's theme (, in the Manifest.) However, when I defined a custom theme for my app, with a custom background color, the stripes disappeared, replaced by the single background color defined in my theme. I thought I successfully created a striped Andr