Android Toolbar menu text color

Add these lines in your AppTheme style

<item name="actionMenuTextColor">@color/white</item>
<item name="android:actionMenuTextColor">@color/white</item>

Having a material toolbar you can play with styling modifying text title and menu texts as follows:

<com.google.android.material.appbar.MaterialToolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?actionBarSize"
    android:background="@android:color/white"
    android:elevation="6dp"
    android:theme="@style/App.ToolbarStyle"
    app:titleTextAppearance="@style/App.ToolbarTitleTex"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:menu="@menu/create_item_menu"
    app:titleTextColor="@android:color/black" />

Where this style lets you change the color of the icon of the left:

<style name="App.ToolbarStyle" parent="ThemeOverlay.MaterialComponents.Toolbar.Primary">
    <item name="colorOnPrimary">@color/colorPrimary</item>
</style>

Also you can change the title text appearance with another style:

<style name="App.ToolbarTitleTex" parent="ThemeOverlay.MaterialComponents.Toolbar.Primary">
    <item name="android:textSize">18sp</item>
    <item name="fontFamily">@font/roboto_bold</item>
</style>

And finally to change the menu item style you need to add this item property to the main style/theme of the app (the one you set in the AndroidManifest file:

<item name="actionMenuTextAppearance">@style/App.ToolbarMenuItem</item>

With:

<style name="App.ToolbarMenuItem" parent="ThemeOverlay.MaterialComponents.Toolbar.Primary">
    <item name="android:textSize">14sp</item>
    <item name="fontFamily">@font/roboto_bold</item>
    <item name="textAllCaps">true</item>
    <item name="android:textStyle">bold</item>
</style>

The final result would be something like this:

Modern way under Material3 theming.

<style name="AppTheme" parent="Theme.Material3.Dark">
    <item name="toolbarStyle">@style/ToolBarStyle</item>
...
</style>
<style name="ToolBarStyle" parent="@style/Widget.Material3.Toolbar">
    <item name="titleTextColor">@android:color/holo_green_light</item>
    <item name="navigationIconTint">@android:color/holo_blue_light</item>
    <item name="materialThemeOverlay">@style/ToolbarThemeOverlay</item>
</style>
<style name="ToolbarThemeOverlay" parent="">
    <item name="actionMenuTextColor">@android:color/holo_red_light</item>
</style>

materialThemeOverlay - is the key to apply the colors to action menu items

You need to declare a Theme like this

<style name="Theme.PopupOverlay.Menu" parent="ThemeOverlay.AppCompat.Light" >
    <item name="android:textColor">@android:color/white</item>
</style>

And then, in your Toolbar in layout view you must specify to use that theme

    <androidx.appcompat.widget.Toolbar xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/Theme.PopupOverlay.Menu" />