Having a screen A in which you select a category, how can I pass the category variable to the next s...

# compose

[Pablo]

Having a screen A in which you select a category, how can I pass the category variable to the next screen B? I'm using navigation and viewmodel, so I suposse I should pass the argument using navigation arguments, and then, what should I do with the parameter? should it be passed to the B screen viewmodel in the viewmodel constructor as a parameter? or Which is the correct way to do this?

[Pablo]

Or maybe the correct approach is to have a general application state where to store things that must be shared between screens, for example, the current selected category?

[psh]

Take a look at https://developer.android.com/jetpack/compose/navigation#nav-with-args

[Pablo]

so it is the correct approach?

[Pablo]

and what to do with argument once received?

[Pablo]

the second part of my question

[Ian Lake]

ViewModels automatically receive all arguments via their SavedStateHandle, you don't have to pass them to the ViewModel at all

[sindrenm]

Just note that if your category type is more complex than a string, than you won't be able to pass it in it's entirety; you'd instead want to pass something like a category ID or something, then get that category ID from the aforementioned SavedStateHandle in Screen B's view model where you'd also get the category based on that ID.

[Pablo]

so, what do you mean?

[Pablo]

which is the correct approach then?

[Pablo]

maybe can you give a small sample with code for your proposal?