activity_secend.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/backgroundLayout"
    tools:context="com.github.sshadkany.android_neumorphic_test_app.SecendActivity">

        <!--        <com.github.sshadkany.shapes.PolygonView-->
        <!--            android:id="@+id/my_polygon"-->
        <!--            android:layout_width="0dp"-->
        <!--            android:layout_height="0dp"-->
        <!--            android:layout_margin="5dp"-->
        <!--            app:layout_constraintBottom_toBottomOf="parent"-->
        <!--            app:layout_constraintEnd_toEndOf="parent"-->
        <!--            app:layout_constraintStart_toStartOf="parent"-->
        <!--            app:layout_constraintTop_toTopOf="parent"-->
        <!--            app:shape_polygon_backgroundColor="#ECF0F3"-->
        <!--            app:shape_polygon_shadow_type="drop_shadow"-->
        <!--            app:shape_polygon_side="3">-->


        <!--        </com.github.sshadkany.shapes.PolygonView>-->


        <!--Dark mode Example  -->
        <com.github.sshadkany.shapes.RoundRectView
            android:id="@+id/roundRectView"
            android:layout_width="300dp"
            android:layout_height="300dp"
            android:layout_margin="5dp"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"


            app:shape_roundRect_backgroundColor="#303234"
            app:shape_roundRect_light_color="#66494949"
            app:shape_roundRect_dark_color="#66000000"

            app:shape_roundRect_bottomLeftRadius="12dp"
            app:shape_roundRect_bottomRightRadius="12dp"
            app:shape_roundRect_topLeftRadius="12dp"
            app:shape_roundRect_topRightRadius="12dp"

            app:shape_roundRect_shadow_type="drop_shadow">

        </com.github.sshadkany.shapes.RoundRectView>

</androidx.constraintlayout.widget.ConstraintLayout>