toolbar collapsing

collapsing_toolbar.xml

<androidx.coordinatorlayout.widget.CoordinatorLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_constraintBottom_toTopOf="@id/view_separator"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

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

                <com.google.android.material.appbar.CollapsingToolbarLayout
                    android:id="@+id/ctPromo"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/white"
                    android:fitsSystemWindows="true"
                    app:collapsedTitleGravity="center_horizontal"
                    app:collapsedTitleTextAppearance="@style/ToolbarTextAppereance.Dark"
                    app:contentScrim="@color/white"
                    app:expandedTitleTextAppearance="@style/ToolbarTextAppereance.ExpandedCollapsingToolbar"
                    app:layout_scrollFlags="scroll|exitUntilCollapsed"
                    app:statusBarScrim="@android:color/transparent">

                    <androidx.appcompat.widget.AppCompatImageView
                        android:id="@+id/ivPromoDetail"
                        android:layout_width="match_parent"
                        android:layout_height="220dp"
                        app:layout_collapseMode="parallax"
                        app:layout_constraintEnd_toEndOf="parent"
                        app:layout_constraintStart_toStartOf="parent"
                        app:layout_constraintTop_toBottomOf="@id/toolbar" />

                    <include
                        android:id="@+id/toolbar"
                        layout="@layout/view_toolbar_light"
                        android:layout_width="match_parent"
                        android:layout_height="?attr/actionBarSize"
                        android:background="@android:color/transparent"
                        app:layout_collapseMode="pin"
                        app:layout_constraintEnd_toEndOf="parent"
                        app:layout_constraintStart_toStartOf="parent"
                        app:layout_constraintTop_toTopOf="parent" />

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

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

            <androidx.core.widget.NestedScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fillViewport="true"
                app:layout_behavior="@string/appbar_scrolling_view_behavior"
                app:layout_constraintBottom_toTopOf="@id/view_separator"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <androidx.appcompat.widget.AppCompatTextView
                        android:id="@+id/tvPromoName"
                        style="@style/TextParagraph1.Medium"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="@dimen/spacing_xxh"
                        android:textAlignment="center"
                        android:textColor="@color/darkGreyBlue"
                        tools:text="Discount 500rb" />

                    <androidx.appcompat.widget.AppCompatTextView
                        android:id="@+id/tvValidDate"
                        style="@style/TextParagraph3"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="@dimen/spacing"
                        android:text="@string/lifepack_valid_date"
                        android:textAlignment="center"
                        android:textColor="@color/darkGreyBlue60" />

                    <androidx.appcompat.widget.AppCompatTextView
                        android:id="@+id/tvValidDateValue"
                        style="@style/TextParagraph3"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:textAlignment="center"
                        android:textColor="@color/darkGreyBlue"
                        tools:text="1 June to 24 June 2020" />

                    <include
                        android:id="@+id/separator"
                        layout="@layout/view_dash_light_periwinkle_two_separator"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/spacing_small"
                        android:layout_marginStart="@dimen/spacing_xh"
                        android:layout_marginTop="@dimen/spacing_xh"
                        android:layout_marginEnd="@dimen/spacing_xh"
                        app:layout_constraintTop_toBottomOf="@id/tvValidDateValue" />

                    <androidx.recyclerview.widget.RecyclerView
                        android:id="@+id/rvPromoDetail"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="@dimen/spacing_xh"
                        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
                        app:layout_constraintTop_toBottomOf="@id/separator" />

                </LinearLayout>

            </androidx.core.widget.NestedScrollView>

        </androidx.coordinatorlayout.widget.CoordinatorLayout>