<?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:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/button_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:src="@drawable/ic_arrow_downward_24dp"
        android:theme="@style/Theme.AppCompat"
        android:tint="@color/gray_material"
        android:visibility="invisible"
        app:backgroundTint="@color/white"
        app:fabSize="mini"
        app:layout_anchor="@id/recycler_view"
        app:layout_anchorGravity="bottom|end" />

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