activity_button.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:background="#ECF0F3"
    tools:context="com.github.sshadkany.android_neumorphic_test_app.ActivityButton">

    <com.github.sshadkany.shapes.CircleView
        android:id="@+id/my_button"
        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_circle_backgroundColor="#ECF0F3"
        app:shape_circle_shadow_type="drop_shadow">

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:layout_gravity="center"
            android:tint="#221F1F"
            app:srcCompat="@drawable/abc_vector_test" />
    </com.github.sshadkany.shapes.CircleView>

</androidx.constraintlayout.widget.ConstraintLayout>