Using SkeletonRecyclerView make view holder item to be flattened

[sh3lan93]

I am using SkeletonRecyclerView for making a shimmering effect to recycler view items and using a card view to be the root element of my view holder item layout. when using the SkeletonRecyclerView cause my view holder item to be flattened although I set the card elevation attribute. what may cause this issue?

here are snippets:

<aglibs.loading.skeleton.layout.SkeletonRecyclerView
				android:layout_width="match_parent"
				android:layout_height="wrap_content"
				app:enableDevelopPreview="true"
				app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
				app:skeletonViewHolderAmount="10"
				app:skeletonViewHolderItem="@layout/item_ediet_center_layout"
				app:skeletonViewHolderTruncate="true"
				tools:itemCount="2"
				tools:listitem="@layout/item_ediet_center_layout" />

and for view holder item layout

<androidx.cardview.widget.CardView
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		app:cardBackgroundColor="@android:color/white"
		app:cardCornerRadius="@dimen/_10dp"
		app:cardElevation="@dimen/_4dp"
		app:cardUseCompatPadding="true">

		<androidx.constraintlayout.widget.ConstraintLayout
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:padding="@dimen/_8dp">

			<ImageView
				... />

			<TextView
				... />

			<TextView
				... />

		</androidx.constraintlayout.widget.ConstraintLayout>
	</androidx.cardview.widget.CardView>