Creating menu dropdown inside Material Navigation View with support library

Question

As said in the title, I'm trying to create a submenu inside the standard Navigation View menu. But I want it to be expandable and material designed.

<group android:checkableBehavior="single">

    <item
        android:id="@+id/inbox"
        android:checked="false"
        android:icon="@drawable/ic_inbox"
        android:title="@string/inbox_string" />

    <item
        android:title="Submenu title">
        <menu>
            <item
                android:id="@+id/menuSortNewest"
                android:title="Sort by newest" />
            <item
                android:id="@+id/menuSortRating"
                android:title="Sort by rating" />
        </menu>
    </item>


</group>

This way I only obtain an header, without dropdown. Any ideas on how to it?

Answer 1

As @Kris-larson said in comment, NavigationView only supports a single level menu, to have an expandable submenus you need a custom navigation drawer coded, my suggestion is MaterialDrawer library, a flexible and easy to use drawer library for your project.

Happy coding!