ActionMenuの背景変更

action_button_background.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="false" android:state_pressed="false">
        <shape android:shape="rectangle">
            <solid android:color="@android:color/black" />
        </shape>
    </item>
    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <solid android:color="@android:color/holo_blue_bright" />
        </shape>
    </item>
</selector>

style.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="AppTheme" parent="android:Theme.Holo.Light">
        <item name="android:actionButtonStyle">@style/App.Widget.ActionButton</item>
    </style>

    <style name="App" />
    <style name="App.Widget" />
    <style name="App.Widget.ActionButton" parent="android:style/Widget.Holo.ActionButton">
        <item name="android:background">@drawable/action_button_background</item>
    </style>

</resources>