android animation. transformation?

Question

Android

Hello. Please tell me which classes you need to use and where you can find code examples to implement the transformation of the View form. For example, to make a square button (without a corner radius) fade into a circle, or even harder, so that a circle fades into a star, etc.
I can assume that there is `ObjectAnimator.ofObject` for this, but I did not quite understand how to work with it.