You should use action layout
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".LandingActivity">
<item
android:id="@+id/action_cart"
android:title="cart"
android:actionLayout="@layout/cart_update_count"
android:icon="@drawable/shape_notification"
app:showAsAction="always"/>
</menu>
and then the action layout can have the textview with divider.
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical">
<View
android:id="@+id/divider"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/divider"/>
<TextView
android:id="@android:id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/selectableItemBackground"
android:gravity="center_vertical"
android:textAppearance="?attr/textAppearanceListItemSmall"/>
</LinearLayout>
then you can add the click listener in code