res/layout/activity_base.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  Copyright (C) 2012 Andrew Neal
  Copyright (C) 2014 The CyanogenMod Project
  Copyright (C) 2017-2021 The LineageOS Project
  Copyright (C) 2019 SHIFT GmbH

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
<org.lineageos.eleven.slidinguppanel.SlidingUpPanelLayout
    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:id="@+id/sliding_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="bottom"
    app:dragView="@+id/firstPanelDragArea"
    app:dragViewClickable="false"
    app:panelHeight="@dimen/bottom_action_bar_height"
    app:shadowHeight="@dimen/sliding_panel_shadow_height"
    app:slidePanelOffset="@dimen/bottom_action_bar_height">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:visibility="gone">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?android:attr/actionBarSize"
            android:elevation="@dimen/action_bar_elevation"
            android:theme="@style/ToolBarTheme"
            app:popupTheme="@style/ToolBarPopupTheme"
            app:titleTextAppearance="@style/TextAppearance.Widget.Event.Toolbar.Title" />

        <FrameLayout
            android:id="@+id/activity_base_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </FrameLayout>

    <org.lineageos.eleven.slidinguppanel.SlidingUpPanelLayout
        android:id="@+id/sliding_layout2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/activity_base_background_color"
        android:gravity="bottom"
        app:directOffset="true"
        app:dragView="@+id/secondPanelDragArea"
        app:fadeColor="@color/transparent"
        app:panelHeight="@dimen/sliding_panel_indicator_height"
        app:shadowHeight="@dimen/sliding_panel_shadow_height">

        <include
            layout="@layout/album_scrim_image"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <LinearLayout
            android:id="@+id/firstPanelDragArea"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <include layout="@layout/bottom_action_bar" />

            <fragment
                android:id="@+id/audioPlayerFragment"
                class="org.lineageos.eleven.ui.fragments.AudioPlayerFragment"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                tools:ignore="FragmentTagUsage" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <LinearLayout
                android:id="@+id/secondPanelDragArea"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="@dimen/sliding_panel_indicator_height"
                    android:layout_gravity="center_horizontal"
                    android:scaleType="centerInside"
                    android:src="@drawable/drag_indicator"
                    android:contentDescription="@null" />

                <include
                    android:id="@+id/secondHeaderBar"
                    layout="@layout/header_bar" />
            </LinearLayout>

            <fragment
                android:id="@+id/queueFragment"
                class="org.lineageos.eleven.ui.fragments.QueueFragment"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                tools:ignore="FragmentTagUsage" />
        </LinearLayout>
    </org.lineageos.eleven.slidinguppanel.SlidingUpPanelLayout>
</org.lineageos.eleven.slidinguppanel.SlidingUpPanelLayout>