fedilab-Android-App/app/src/main/res/layout/activity_reorder_tabs.xml

<?xml version="1.0" encoding="utf-8"?><!--
    Copyright 2019 Thomas Schneider

    This file is a part of Fedilab

    This program is free software; you can redistribute it and/or modify it under the terms of the
    GNU General Public License as published by the Free Software Foundation; either version 3 of the
    License, or (at your option) any later version.

    Fedilab is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
    the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
    Public License for more details.

    You should have received a copy of the GNU General Public License along with Fedilab; if not,
    see <http://www.gnu.org/licenses>.
-->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/lv_reorder_tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="none" />

    <RelativeLayout
        android:id="@+id/undo_container"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="0dp"
        android:background="?colorPrimaryDark"
        android:visibility="gone">

        <TextView
            android:id="@+id/undo_message"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_centerInParent="true"
            android:layout_marginStart="10dp"
            android:paddingLeft="20dp"
            android:paddingTop="5dp"
            android:paddingRight="20dp"
            android:paddingBottom="5dp"
            android:textColor="?colorAccent"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/undo_action"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_centerInParent="true"
            android:layout_marginEnd="10dp"
            android:paddingLeft="20dp"
            android:paddingTop="5dp"
            android:paddingRight="20dp"
            android:paddingBottom="5dp"
            android:text="@string/undo"
            android:textAllCaps="true"
            android:textColor="?colorAccent"
            android:textSize="18sp" />
    </RelativeLayout>
</RelativeLayout>