<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:map="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

    <LinearLayout
        android:id="@+id/floor_selector_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:orientation="horizontal"/>

    <com.google.android.gms.maps.MapView
        android:id="@+id/map_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/floor_selector_layout"
        map:cameraTargetLat="44.974320"
        map:cameraTargetLng="-93.277608"
        map:cameraZoom="19.1"/>

    <!-- TODO update drawable -->
    <ImageView
        android:id="@+id/map_recenter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:background="@drawable/ic_arrow_back_white_24dp"/>

</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:map="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

    <LinearLayout
        android:id="@+id/floor_selector_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:orientation="horizontal"/>

    <com.google.android.gms.maps.MapView
        android:id="@+id/map_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/floor_selector_layout"
        map:cameraTargetLat="44.974320"
        map:cameraTargetLng="-93.277608"
        map:cameraZoom="19.1"/>

    <!-- TODO update drawable -->
    <android.support.design.widget.FloatingActionButton
        android:id="@+id/map_recenter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/activity_horizontal_margin"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:src="@drawable/ic_center_location"/>

</RelativeLayout>
Change map centering button to FAB Add margin
Change map centering button to FAB
Add margin
