<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

<com.google.android.gms.maps.MapView
    android:id="@+id/mapview"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</com.google.android.gms.maps.MapView>
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <android.support.v7.widget.RecyclerView
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:id="@+id/item_picker">

    </android.support.v7.widget.RecyclerView>
</RelativeLayout>
</RelativeLayout>