如何在Android中改变子菜单的文本颜色？我自定义了应用程序主题并覆盖了相关属性，但仍然不起作用。我的菜单有两个子菜单，最初是隐藏的，当点击时，它会显示。但是，子菜单的样式不能修改，而操作栏的标题可以。这个问题困扰了我一整天，我几乎尝试了我找到的每一种方法。这是我的代码！
menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.classsignin.MainActivity" >

<item 
    android:id="@+id/action_overflow"
    android:title="分享"
    android:icon="@drawable/drop_select"
    android:showAsAction="always"
    >
    <menu >
        <item 
            android:id="@+id/absent"
            android:title="请假"
            android:icon="@drawable/absent"
            />
        <item
            android:id="@+id/refresh"
            android:title="刷新课程"
            android:icon="@drawable/refresh"
             />
    </menu>
</item>

styles.xml

<style name="CustomTheme" parent="@android:style/Theme.Holo.Light">
    <item name="android:actionBarStyle">@style/MyActionBarTheme</item>
    <item name="android:actionMenuTextAppearance">@style/MyActionBarMenu</item>
    <item name="android:actionMenuTextColor">@color/blue</item>
    <item name="android:homeAsUpIndicator">@drawable/back</item>
    <item name="android:spinnerItemStyle">@style/MySpinnerItem</item>
</style>

<style name="MyActionBarTheme" parent="@android:style/Widget.Holo.Light.ActionBar">
    <item name="android:background">@color/white</item>
    <item name="android:titleTextStyle">@style/MyActionBarTitle</item>
</style>

<style name="MyActionBarTitle" parent="@android:style/TextAppearance.Holo.Widget.ActionBar.Title">  
    <item name="android:textSize">16sp</item>
    <item name="android:textColor">@color/blue</item>  
</style>

<style name="MyActionBarMenu" parent="@android:style/TextAppearance.Holo.Widget.ActionBar.Menu">  
    <item name="android:textSize">16sp</item>
    <item name="android:textColor">@color/blue</item> 
</style>

<style name="MySpinnerItem" parent="@android:style/Widget.Holo.TextView.SpinnerItem">
   <item name="android:textAppearance">@style/MyTextAppearance</item>
</style>

<style name="MyTextAppearance" parent="@android:style/TextAppearance.Holo.Widget.TextView.SpinnerItem">  
    <item name="android:textColor">@color/blue</item> 
</style>