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activity_navigation_drawer.xml

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

<item
        android:id="@+id/nav_signin"
        android:title="@string/sign_in" />
    <item
        android:id="@+id/nav_signout"
        android:title="@string/sign_out" />

<item
        android:id="@+id/nav_u2fOperations"
        android:title="@string/u2f_operations">
        <menu>
            <item
                android:id="@+id/nav_register"
                android:icon="@android:drawable/ic_menu_add"
                android:title="@string/register_token" />
            <item
                android:id="@+id/nav_allowReregistration"
                android:checkable="true"
                android:checked="false"
                android:title="@string/allow_reregistration" />

<item
                android:id="@+id/nav_auth"
                android:icon="@drawable/ic_menu_login"
                android:title="@string/auth_token" />
        </menu>
    </item>

<item android:title="@string/open_source">
        <menu>
            <item
                android:id="@+id/nav_gitbuh"
                android:icon="@drawable/github_octocat"
                android:title="@string/github" />
        </menu>
    </item>
</menu>