Appcompat 22.2以大写形式显示菜单而不是小写

Question

我使用以下样式将菜单更改为小写但不起作用。 我在互联网上搜索过参考资料，但我找不到任何东西。我觉得图书馆有问题。如果有人有答案，请告诉我。

<!--
    Base application theme, dependent on API level. This theme is replaced
    by AppBaseTheme from res/values-vXX/styles.xml on newer devices.

-->
<style name="AppBaseTheme" parent="Theme.AppCompat.Light">
    <!--
        Theme customizations available in newer API levels can go in
        res/values-vXX/styles.xml, while customizations related to
        backward-compatibility can go here.

    -->

</style>

<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
    <item name="actionMenuTextAppearance">@style/MyMenuTextAppearance</item>
    <item name="android:actionMenuTextAppearance">@style/MyMenuTextAppearance</item>
</style>

<style name="MyMenuTextAppearance" parent="TextAppearance.AppCompat.Widget.ActionBar.Menu">
    <item name="android:textAllCaps">false</item>
</style>