将浮动操作按钮移动到Google Maps API片段中方向弹出菜单的上方？

<RelativeLayout 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">

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/floatingActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        app:srcCompat="@drawable/ic_add"
        app:backgroundTint="@color/colorPrimary"
        app:fabSize="normal" />

    <Button
        android:id="@+id/directionsButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/floatingActionButton"
        android:layout_alignParentEnd="true"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:text="Directions" />

    <!-- Google Maps API片段 -->
    <fragment
        android:id="@+id/mapFragment"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/directionsButton" />

</RelativeLayout>