PlayerAndroid/app/src/main/res/layout/fragment_player.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"
    android:clickable="true"
    android:focusable="true">

    <View
        android:id="@+id/gradient_background"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

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

    <code.name.monkey.retromusic.views.FitSystemWindowsLayout
        android:id="@+id/safeArea"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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

            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <include layout="@layout/status_bar" />
            </FrameLayout>

            <code.name.monkey.retromusic.views.WidthFitSquareLayout
                android:id="@+id/album_cover_container"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <fragment
                    android:id="@+id/player_album_cover_fragment"
                    android:name="code.name.monkey.retromusic.ui.fragments.player.PlayerAlbumCoverFragment"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    tools:layout="@layout/fragment_album_cover" />
            </code.name.monkey.retromusic.views.WidthFitSquareLayout>

            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1">

                <fragment
                    android:id="@+id/playback_controls_fragment"
                    android:name="code.name.monkey.retromusic.ui.fragments.player.normal.PlayerPlaybackControlsFragment"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    tools:layout="@layout/fragment_player_playback_controls" />
            </FrameLayout>

            <FrameLayout
                android:id="@+id/toolbar_container"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0">

                <androidx.appcompat.widget.Toolbar
                    android:id="@+id/player_toolbar"
                    style="@style/Toolbar48"
                    android:layout_height="48dp"
                    android:layout_gravity="bottom"
                    android:navigationIcon="@drawable/ic_close_white_24dp"
                    app:navigationIcon="@drawable/ic_close_white_24dp" />
            </FrameLayout>
        </LinearLayout>
    </code.name.monkey.retromusic.views.FitSystemWindowsLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>