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

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

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:elevation="0dp"
        tools:ignore="UnusedAttribute">

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

    </FrameLayout>

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:id="@+id/mainContent"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/appBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:liftOnScroll="true">

            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_scrollFlags="scroll|enterAlways">

                <androidx.appcompat.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="?attr/colorSurface"
                    app:popupTheme="?attr/toolbarPopupTheme"
                    app:title="@string/app_name"
                    app:titleTextAppearance="@style/ToolbarTextAppearanceNormal.Library"
                    app:titleTextColor="?attr/colorControlNormal"
                    tools:ignore="UnusedAttribute" />

                <ViewStub
                    android:id="@+id/cab_stub"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/toolbar_height" />
            </FrameLayout>
        </com.google.android.material.appbar.AppBarLayout>

        <androidx.fragment.app.FragmentContainerView
            android:id="@+id/fragment_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
            tools:layout="@layout/fragment_main_activity_recycler_view" />
    </androidx.coordinatorlayout.widget.CoordinatorLayout>
</LinearLayout>