Quelle  fragment_list.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?android:attr/colorBackground"
        android:clipToPadding="false"
        android:paddingBottom="@dimen/grid_unit_x15"
        app:layout_behavior="ch.threema.app.ui.ListViewBehavior" />

    <com.google.android.material.progressindicator.CircularProgressIndicator
        android:id="@+id/progress"
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:layout_gravity="center"
        android:indeterminate="true" />

    <com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
        android:id="@+id/floating"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="@dimen/grid_unit_x2"
        android:layout_marginBottom="@dimen/grid_unit_x2"
        android:clickable="true"
        android:text="@string/send"
        android:visibility="gone"
        app:elevation="@dimen/floating_button_elevation"
        app:icon="@drawable/ic_send_outline"
        app:layout_anchor="@android:id/list"
        app:layout_anchorGravity="bottom|right"
        app:layout_insetEdge="bottom"
        app:pressedTranslationZ="@dimen/floating_button_translation_z_pressed"
        app:useCompatPadding="true"
        tools:visibility="visible" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>