要更改的工具栏选项菜单的颜色，添加到您的工具栏元素

 应用程序：popupTheme =@风格/ MyDarkToolbarStyle
 

然后在你的 styles.xml 定义弹出菜单样式

 ＆LT;样式名称=MyDarkToolbarStyle父=ThemeOverlay.AppCompat.Light＆GT;
    ＆LT;项目名称=机器人：colorBackground＆GT; @色/ mtrl_white_100＆LT; /项目＆GT;
    ＆LT;项目名称=机器人：文字颜色＆GT; @色/ mtrl_light_blue_900＆LT; /项目＆GT;
＆LT; /风格＆GT;
 

请注意，您需要使用 colorBackground 不可以 背景。后者将被应用到一切（菜单本身和每个菜单项），前者仅适用于弹出式菜单。

I am using the toolbar for android. I just want to change the background color of the overflow menu. But it is not changing.

Style xml

<style name="MyDarkToolbarStyle" parent="Widget.AppCompat.Toolbar">
    <item name="popupTheme">@style/PopupMenuStyle</item>
    <item name="theme">@style/ThemeOverlay.AppCompat.Dark.ActionBar</item>
</style>

<style name="PopupMenuStyle" parent="android:Widget.Holo.Light.PopupMenu">
    <item name="android:popupBackground">@android:color/white</item>
</style>

Toolbar XML

    <android.support.v7.widget.Toolbar
    android:id="@+id/tool_bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/ColorPrimary"
    android:elevation="2dp"
    android:theme="@style/MyDarkToolbarStyle" />

To change the toolbar options menu color, add this to your toolbar element

app:popupTheme="@style/MyDarkToolbarStyle"

Then in your styles.xml define the popup menu style

<style name="MyDarkToolbarStyle" parent="ThemeOverlay.AppCompat.Light">
    <item name="android:colorBackground">@color/mtrl_white_100</item>
    <item name="android:textColor">@color/mtrl_light_blue_900</item>
</style>

Note that you need to use colorBackground not background. The latter would be applied to everything (the menu itself and each menu item), the former applies only to the popup menu.