How to add a FAB button menu to a LinearLayout and a ListView. I leave my code

<include android:id="@+id/toolbar" layout="@layout/layout_toolbar" />





<ListView
    android:id="@+id/lv_listado"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:dividerHeight="7dp">

</ListView>


<RelativeLayout
    android:id="@+id/rl_empty_filter"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:visibility="gone"




>

    <TextView
        android:id="@+id/txtv_empty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />





</RelativeLayout>