How to add line divider for menu item Android

Make sure to call MenuCompat.setGroupDividerEnabled(menu, true); when you inflate your menu, otherwise groups will not be separated by divider!

Example:

@Overridepublic boolean onCreateOptionsMenu(Menu menu) {    getMenuInflater().inflate(R.menu.menu_activity_main, menu);    MenuCompat.setGroupDividerEnabled(menu, true);    return true;}

And make sure to have different groups in your menu xml, e.g.:

    <menu>        <group android:id="@+id/sorting" >            <item                android:id="@+id/action_sorting_new_old"                android:title="@string/action_sorting_new_old"/>            <item                android:id="@+id/action_sorting_a_z"                android:title="@string/action_sorting_a_z"/>        </group>        <group android:id="@+id/settings">            <item                android:id="@+id/action_settings"                android:title="@string/action_settings"/>        </group>    </menu>

All you need to do is define a group with an unique ID, I have checked the implementation if group has different id's it will create a divider.

Example menu, creating the separator:

<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=".MainActivity"><group android:id="@+id/grp1">    <item        android:id="@+id/navigation_item_1"        android:checked="true"        android:icon="@drawable/ic_home"        android:title="@string/navigation_item_1" /></group><group android:id="@+id/grp2">    <item        android:id="@+id/navigation_item_2"        android:icon="@drawable/ic_home"        android:title="@string/navigation_item_2" /></group>

hope this helps

UPDATE

for menu item may be you can use this

    <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">    <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 actionLayout file will be

 <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>

Old question, but the above answers didn't work for me (and I object to adding "groups" for single items). What did work was adding a style element as follows:

    <!-- Base application theme. -->    <style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar"> <!--  .Light.DarkActionBar"> -->        <!-- Customize your theme here. -->        <item name="colorPrimary">@color/colorPrimary</item>        <item name="colorPrimaryDark">#17161B</item>        <item name="colorAccent">@color/colorAccent</item>        <item name="android:dropDownListViewStyle">@style/PopupMenuListView</item>//<-add this    </style>

that references

    <style name="PopupMenuListView" parent="@style/Widget.AppCompat.ListView.DropDown">        <item name="android:divider">#dddddd</item>        <item name="android:dividerHeight">1dp</item>    </style>

in the same res/values/styles.xml file. Hope it helps!