session-android/res/layout/conversation_list_fragment.xml

<?xml version="1.0" encoding="utf-8"?>

<android.support.design.widget.CoordinatorLayout
              xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              xmlns:fab="http://schemas.android.com/apk/res-auto"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:orientation="vertical">

    <LinearLayout android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:orientation="vertical">

        <org.thoughtcrime.securesms.components.reminder.ReminderView
                android:id="@+id/reminder"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

        <android.support.v7.widget.RecyclerView
                android:id="@+id/list"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scrollbars="vertical"
                android:nextFocusDown="@+id/fab"
                android:nextFocusForward="@+id/fab"
                tools:listitem="@layout/conversation_list_item_view" />

    </LinearLayout>

    <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:src="@drawable/ic_create_white_24dp"
            android:focusable="true"
            android:contentDescription="@string/conversation_list_fragment__fab_content_description"/>

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