Não consigo colocar o FAB de jeito nenhum, estou usando a versão mais recente do AS a 3.5.3.
<?xml version="1.0" encoding="utf-8"?>
<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">
<ListView
android:id="@+id/activity_main_lista_de_alunos"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/floatingActionButton10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
app:srcCompat="@mipmap/ic_launcher" />
</ListView>
</RelativeLayout>
