layout_draggable_panel.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <com.hoanganhtuan95ptit.draggable.widget.DragFrame
        android:id="@+id/frameDrag"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:background="@android:color/transparent">

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

            <com.google.android.material.appbar.CollapsingToolbarLayout
                android:id="@+id/collapsingToolbarLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_scrollFlags="scroll|exitUntilCollapsed">

                <androidx.appcompat.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:background="@android:color/transparent"
                    app:layout_collapseMode="pin" />
            </com.google.android.material.appbar.CollapsingToolbarLayout>
        </com.google.android.material.appbar.AppBarLayout>

        <FrameLayout
            android:id="@+id/frameSecond"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

    </com.hoanganhtuan95ptit.draggable.widget.DragFrame>

</merge>