Signal-Android/res/layout/activity_contact_share_edit.xml

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

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/contact_share_edit_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="80dp"
        android:clipToPadding="false"/>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/contact_share_edit_send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:tint="@color/white"
        app:srcCompat="@drawable/ic_send_lock_24"
        android:layout_margin="@dimen/floating_action_button_margin"/>

</FrameLayout>