navigation_drawer.xml

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

	<group android:checkableBehavior="single">
		<item
			android:id="@+id/nav_btn_contacts"
			android:icon="@drawable/ic_contacts"
			android:title="@string/contact_list_button"/>
		<item
			android:id="@+id/nav_btn_groups"
			android:icon="@drawable/ic_group"
			android:title="@string/groups_button"/>
		<item
			android:id="@+id/nav_btn_forums"
			android:icon="@drawable/ic_forums_black_24dp"
			android:title="@string/forums_button"/>
		<item
			android:id="@+id/nav_btn_blogs"
			android:icon="@drawable/blogs"
			android:title="@string/blogs_button"/>
	</group>

	<group android:checkableBehavior="single">
		<item
			android:id="@+id/nav_btn_settings"
			android:icon="@drawable/ic_settings_black_24dp"
			android:title="@string/settings_button"/>
		<item
			android:id="@+id/nav_btn_signout"
			android:icon="@drawable/ic_signout"
			android:title="@string/sign_out_button"/>
	</group>

</menu>