MenuDrawer 样式错误

error in MenuDrawer Style

我用这个代码

    <style name="MenuDrawerStyle" parent="MenuDrawer.Widget.Category">
    <item name="mdActiveIndicator">@drawable/menu_arrow</item>
    <item name="mdMenuSize">250dp</item>
</style>

并出现此错误
错误:找不到与给定名称匹配的资源:attr 'mdActiveIndicator'

有什么问题?

尝试this解决方案它看起来非常相似

If you are using custom attributes for a gradle library then don't forget to mark it as such. The gradle build file of the library needs:

apply plugin: 'android-library'

instead of

apply plugin: 'android'