RetroMusicPlayer/app/src/main/res/layout/fragment_full.xml

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

    <fragment
        android:id="@+id/playerAlbumCoverFragment"
        android:name="code.name.monkey.retromusic.ui.fragments.player.PlayerAlbumCoverFragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:layout="@layout/fragment_album_full_cover" />

    <View
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#50000000" />

    <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="wrap_content"
            android:layout_gravity="bottom"
            android:orientation="vertical">

            <fragment
                android:id="@+id/playbackControlsFragment"
                android:name="code.name.monkey.retromusic.ui.fragments.player.full.FullPlaybackControlsFragment"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="bottom"
                tools:layout="@layout/fragment_full_player_controls" />

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

                <androidx.appcompat.widget.Toolbar
                    android:id="@+id/playerToolbar"
                    style="@style/Toolbar"
                    android:navigationIcon="@drawable/ic_close_white_24dp" />

            </FrameLayout>
        </LinearLayout>
    </code.name.monkey.retromusic.views.FitSystemWindowsLayout>
</FrameLayout>