playlist_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:sothree="http://schemas.android.com/apk/res-auto"
    android:id="@+id/sliding_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="bottom"
    sothree:umanoPanelHeight="?attr/actionBarSize"
    sothree:umanoParalaxOffset="0dp"
    sothree:umanoShadowHeight="4dp">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/app_bar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

            <com.google.android.material.appbar.CollapsingToolbarLayout
                android:id="@+id/collapsing_toolbar_layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:fitsSystemWindows="true"
                app:contentScrim="?attr/colorPrimary"
                app:expandedTitleMarginEnd="64dp"
                app:expandedTitleMarginStart="48dp"
                app:layout_scrollFlags="scroll|exitUntilCollapsed">

                <in.androidhunt.musicDEmo.view.SquareImageView
                    android:id="@+id/image_album"
                    android:layout_width="match_parent"
                    android:layout_height="400dp"
                    android:adjustViewBounds="true"
                    android:background="@android:color/darker_gray"
                    android:scaleType="fitXY"
                    app:layout_collapseMode="parallax"
                    app:layout_collapseParallaxMultiplier="0.7" />

                <androidx.appcompat.widget.Toolbar
                    android:id="@+id/tool_bar"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    android:layout_marginTop="24dp"
                    app:layout_collapseMode="pin"
                    app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
                <androidx.appcompat.widget.Toolbar
                    android:id="@+id/toolbar_dummy"
                    android:visibility="invisible"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    app:layout_collapseMode="pin"
                    />

            </com.google.android.material.appbar.CollapsingToolbarLayout>

        </com.google.android.material.appbar.AppBarLayout>

        <androidx.recyclerview.widget.RecyclerView

            android:id="@+id/playlist_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clipToPadding="false"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

        <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/fab"
            style="@style/FabStyle"
            app:layout_anchor="@id/app_bar_layout"
            app:layout_anchorGravity="bottom|right|end" />

        <ProgressBar
            android:id="@+id/avi_loader"
            style="?android:attr/progressBarStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:layout_gravity="center"
            android:visibility="visible"

            />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

    <include
        android:id="@+id/include_sliding_panel_childtwo"
        layout="@layout/include_slidingpanel_childtwo"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</com.sothree.slidinguppanel.SlidingUpPanelLayout>