Hi 👋. Let's say I've have a complex object I want to persist even if the screen is rotated as state: should I use

ViewModel

or

remeberSaveable

? Which is best practice ?

Are you just talking about config change? You can override all config change so your activity does not get recreated, so the state is retained

In fact, I would like the user to be able to rotate the phone, and have a part of the @Composable updated, but not its state.

Yeah, Compose will react automatically when config changes without losing state, if you do above

Thank you : I'll try it right now 😃

Sounds like your complex object should just be persisted to a db, or to a file (remember... you have to worry about process death too) and then you save the state of the id of that complex object. Also, what you read about configChanges is the "old" guidance. I'm sure the official guidance will be updated at some point to include saying that you should override configChanges in a pure compose app.