session-android/res/layout/conversation_fragment.xml

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

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="fill_parent"
             android:layout_height="match_parent"
             xmlns:app="http://schemas.android.com/apk/res-auto">

    <android.support.v7.widget.RecyclerView
            android:id="@android:id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="vertical"
            android:cacheColorHint="?conversation_background" />

    <View android:id="@+id/compose_divider"
          android:layout_width="match_parent"
          android:layout_height="2dp"
          android:layout_gravity="bottom"
          android:background="@drawable/compose_divider_background"
          android:alpha="1"
          android:visibility="invisible" />

    <ImageButton
            android:id="@+id/scroll_to_bottom_button"
            android:visibility="gone"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginBottom="20dp"
            android:padding="5dp"
            android:layout_gravity="bottom|end"
            android:background="@drawable/circle_tintable"
            android:tint="@color/grey_600"
            android:elevation="1dp"
            android:alpha="0.9"
            android:contentDescription="@string/conversation_fragment__scroll_to_the_bottom_content_description"
            android:src="@drawable/ic_scroll_down"/>

</FrameLayout>