I have a dumb question: ```val tokens = viewModel.tokens.observeAsState(listOf())``` I use mock vie...

# compose

[Yuri Drigin]

I have a dumb question:

val tokens = viewModel.tokens.observeAsState(listOf())

I use mock viewModel for preview with hardcoded livedata

override val stables: LiveData<List<StableTokenWithMetaAndRate>> = liveData {
  listOf(StableTokenWithMetaAndRate.USDp, StableTokenWithMetaAndRate.EURp)
}

However in the preview show me an empty list (((

[Zach Klippenstein (he/him) [MOD]]

I believe that listOf() you’re passing to observeAsState is the initial value, so that’s why it’s showing it in the preview. The non-interactive preview won’t run any coroutines, so observeAsState never actually starts observing your LiveData. At least I’m guessing that’s what it is.

[Yuri Drigin]

Oh. So I need to put my sample date as initial values

[Zach Klippenstein (he/him) [MOD]]

Better yet, just use the overload that uses the `LiveData`’s current value as the the initial value and doesn’t take any parameters: https://developer.android.com/reference/kotlin/androidx/compose/runtime/livedata/package-summary

[Zach Klippenstein (he/him) [MOD]]

(although i’m not sure why that returns a State<T?> – might be a bug, it should just be State<T> i’d think)

[Dominaezzz]

I think you need to call emit in your liveData { .... } .

[Albert Chang]

@Zach Klippenstein (he/him) [MOD] `LiveData`'s Kotlin interoperability is poor and its value is always nullable, which means it is possible to emit null from LiveData<T>.

[Zach Klippenstein (he/him) [MOD]]

Oh, that makes sense 😣