Hi, people! I'm trying to create a new app follow...

# compose-android

[Advitiay Anand]

Hi, people!

I'm trying to create a new app following Clean Architecture to the best of my abilities.
However, I am unable to pass lambdas to my ViewModel 's constructor (as it is constructed using hiltViewModel()).

I read a bit and found that NavArguments and SavedStateHandle should be used to pass arguments in ViewModel, ideally.
Yet, that only seems to support very limited NavArg.Type 's as well. I don't get what I am doing wrong.

Are we not supposed to pass navigation lambdas to ViewModel? Because the state that needs to trigger navigation resides inside the ViewModel only.

Please give your helpful inputs :)
Thread in Slack Conversation

[dewildte]

First of all, navigation is a UI concern.
In my experience handling navigation inside the ViewModel is not scalable
and arguably not a responsibility of the ViewModel.
The ViewModel is a state holder.
Keep navigation in Composables, Fragments, and Activities and it will scale nicely.

[dewildte]

Secondly, a ViewModel Factory is the object that is used to pass arguments into
the constructor if you are not using Hilt to do dependency injection.

[dewildte]

Have you read this:
https://developer.android.com/topic/libraries/architecture/viewmodel/viewmodel-savedstate#resources
?

[dewildte]

Also I would not pass a lamda into the constructor of the ViewModel.
Stick with Interfaces or concrete classes.

[Advitiay Anand]

I get it. I read an SO answer that told to use LaunchEffect with a key and trigger navigation inside its block. Guess I'll try that and see how it goes.

[Advitiay Anand]

Thanks for giving your time and thoughts 🙏