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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:orientation="vertical"
    tools:ignore="UnusedAttribute">

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

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

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/status_bar_container"
        android:layout_alignParentStart="true">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/app_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:elevation="0dp"
            app:elevation="0dp">

            <com.google.android.material.appbar.CollapsingToolbarLayout
                android:id="@+id/collapsing_toolbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_scrollFlags="scroll|enterAlways"
                app:titleEnabled="false">


                <androidx.appcompat.widget.Toolbar
                    android:id="@+id/toolbar"
                    style="@style/Toolbar"
                    app:layout_collapseMode="pin"
                    tools:ignore="UnusedAttribute">

                    <TextView
                        android:id="@+id/title"
                        style="@style/BigTitleTextAppearance"
                        android:text="@string/buy_retro_music_pro" />

                </androidx.appcompat.widget.Toolbar>
            </com.google.android.material.appbar.CollapsingToolbarLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="?dividerColor" />
        </com.google.android.material.appbar.AppBarLayout>

        <androidx.core.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <include layout="@layout/activity_pro_version_content" />
        </androidx.core.widget.NestedScrollView>
    </androidx.coordinatorlayout.widget.CoordinatorLayout>


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center"
        android:padding="16dp"
        android:text="@string/purchase_summary" />
</RelativeLayout>