In your theme file you have to put this :
<style name="AppTheme.ActionBar" parent="Theme.AppCompat.Light.DarkActionBar">
...
<item name="actionMenuTextColor">@color/text_color</item>
...
</style>
and apply this theme to your Toolbar view like this :
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:layout_gravity="top"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
android:theme="@style/AppTheme.ActionBar"/>
android:theme=”@style/AppTheme.ActionBar” don’t forget this line in your toolbar