Briar/briar-android/res/layout/fragment_contact_list.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	android:id="@+id/coordinatorLayout"
	android:layout_width="match_parent"
	android:layout_height="match_parent">

	<org.briarproject.android.util.BriarRecyclerView
		android:id="@+id/contactList"
		android:layout_width="match_parent"
		android:layout_height="match_parent"/>

	<android.support.design.widget.FloatingActionButton
		android:id="@+id/addContactFAB"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="bottom|end"
		android:layout_margin="@dimen/margin_activity_horizontal"
		android:src="@drawable/ic_add_white"
		app:fabSize="normal"
		app:elevation="4dp"
		app:layout_anchor="@id/contactList"
		app:layout_anchorGravity="bottom|right|end"
		app:layout_behavior="org.briarproject.android.util.HideFabOnScrollBehavior"/>

</android.support.design.widget.CoordinatorLayout>