Android. Complicated animation programmatically?

Question

Android

Here are some visual examples. How to implement such a complex animation? Perhaps someone will share useful links on this topic? It is clear that this is just a layout and this is just a picture, but how are such animations made at the programming level?
www.materialup.com/posts/floating-button-interaction
www.materialup.com/posts/compact-login
www.materialup.com/posts/google-keep-pop-z-transition

Answer 1

For the first two links, you need a reveal animation and a translate+rotate cross. There is hardly anything ready for the third, it's hard to say.

Answer 2

www.materialup.com/posts/c/resources/library
Choose any, open, look. You don't have to go far