How exactly does the Jetpack ViewModel save data?

Question

Android

How exactly does the ViewModel work under the hood? When, for example, the user flips the phone? How is data integrity ensured?

Answer 1

Uses a fragment with setRetainInstance(true). Such a fragment survives a configuration change. Actually, like 5-7 years ago, this mechanism has long existed.
Read more here if you're interested.
It can also be useful to read the source codes, I don’t think they are super complicated there.