RetroMusicPlayer/app/src/main/res/layout/activity_lyrics.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:transitionName="@string/transition_lyrics">

    <code.name.monkey.retromusic.lyrics.LrcView
        android:id="@+id/lyricsView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
        app:lrcLabel="@string/no_lyrics_found"
        app:lrcNormalTextSize="32sp"
        app:lrcPadding="16dp"
        app:lrcTextGravity="left"
        app:lrcTextSize="32sp" />

    <com.google.android.material.bottomappbar.BottomAppBar
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:padding="0dp"
        app:contentInsetLeft="0dp"
        app:contentInsetStart="0dp"
        app:contentInsetStartWithNavigation="0dp"
        app:hideOnScroll="true"
        app:titleMargin="0dp"
        app:titleMarginStart="0dp"
        tools:backgroundTint="@color/md_red_400">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:navigationIcon="@drawable/ic_keyboard_arrow_down_black"
            app:contentInsetLeft="0dp"
            app:contentInsetStart="0dp"
            app:contentInsetStartWithNavigation="0dp"
            app:navigationIcon="@drawable/ic_keyboard_backspace_black"
            app:subtitleTextAppearance="@style/TextViewCaption"
            app:titleMargin="0dp"
            app:titleMarginStart="0dp"
            app:titleTextAppearance="@style/TextViewSubtitle1"
            tools:subtitle="@tools:sample/full_names"
            tools:title="@tools:sample/full_names" />

    </com.google.android.material.bottomappbar.BottomAppBar>
</androidx.coordinatorlayout.widget.CoordinatorLayout>