PlayerAndroid/app/src/main/res/layout/fragment_flat_player.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
    android:orientation="vertical">

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

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

    <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>

        <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:navigationIcon="@drawable/ic_close_white_24dp"
                app:navigationIcon="@drawable/ic_close_white_24dp" />
        </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="wrap_content"
                tools:layout="@layout/fragment_player_album_cover" />
        </code.name.monkey.retromusic.views.WidthFitSquareLayout>

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

            <fragment
                android:id="@+id/playback_controls_fragment"
                android:name="code.name.monkey.retromusic.ui.fragments.player.flat.FlatPlaybackControlsFragment"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:layout="@layout/fragment_flat_player_playback_controls" />
        </FrameLayout>
    </LinearLayout>
</FrameLayout>