<View
    android:id="@+id/my_view"
    android:elevation="4dp"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_gravity="center"
    android:background="@android:color/white"/>

View view = findViewById(R.id.my_view);
view.setClipToOutline(true);
view.setOutlineProvider(new ViewOutlineProvider() {
    @Override
    public void getOutline(View view, Outline outline) {
        outline.setOval(0, 0, 200, 200);
    }
});