app/src/main/res/menu/menu_navigation_drawer.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <group
        android:checkableBehavior="single"
        android:id="@+id/group1">

        <item
            android:checked="true"
            android:icon="@drawable/ic_dashboard_black_24dp"
            android:id="@+id/item_dashboard"
            android:title="@string/dashboard"/>
        <item
            android:checked="true"
            android:icon="@drawable/ic_customer_black_24dp"
            android:id="@+id/item_customer"
            android:title="@string/customer"/>

    </group>

    <group
        android:id="@+id/group2">

        <item
            android:id="@+id/item_logout"
            android:icon="@drawable/ic_input_black_24dp"
            android:title="@string/logout"/>

    </group>

</menu>