Jetpack Compose - Unresolved reference: observeAsState

Question

I'm learning Jetpack Compose and I was trying to make a View Model for my @Composable.

In documentation (https://developer.android.com/codelabs/jetpack-compose-state#3) for observing state changes in composable they use observeAsState but in my implementation, the method cannot be found. I get instead Unresolved reference: observeAsState

ViewModel

class MainActivityViewModel : ViewModel() {
    val list: LiveData<MutableList<String>> = MutableLiveData(mutableListOf("Ana", "are", "mere"))

    fun addString(item: String) {
        val list: MutableList<String> = list.value!!
        list.add(item)
    }

}

Composable

I am using Compose 1.0.0-beta01

Just FYI if anyone reads this and doesn't follow: the original question from 2021 refers to the State Codelab v2021. In 2022 a new State Codelab was created and uploaded, so the url above doesn't take you to a place where you can see the code and this API anymore, but a page in the new codelab. Cheers! — Alejandra, May 18 '22 at 22:09

Alexander Hoffmann · Accepted Answer · 2022-04-07T11:05:14.890

163

observeAsState is part of the runtime-livedata library.

Add the dependency to your module's build.gradle file. Replace $compose_version with the version of compose which you use, e.g. 1.0.0-beta01:

implementation "androidx.compose.runtime:runtime-livedata:$compose_version"

You can find the available versions here in Google's Maven repository.

edited Apr 07 '22 at 11:05

answered Mar 10 '21 at 08:10

Alexander Hoffmann

5,104
3
17
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8

Still, the same documentation is not updated for required dependencies – NightFury Sep 27 '21 at 16:48
Is it part of `Compose`? – IgorGanapolsky Mar 08 '23 at 17:37

score 9 · Answer 2 · answered Jul 03 '22 at 07:18

9

Not exactly answering your question, but as a suggestion you could migrate to Flow instead of using live data.

ViewModel ->

val yourList: MutableStateFlow<List<String>> = MutableStateFlow(listOf("String1","String2","String3"))

Composable ->

val yourList by yourViewModel.yourList.collectAsState()

answered Jul 03 '22 at 07:18

mario chois

116
1
2

The same.. The method is not found – Vetalll Jul 11 '22 at 16:16
did you properly imported the setters and getters? – mario chois Aug 16 '22 at 18:06
the issue was with different libraries and versions – Vetalll Aug 28 '22 at 13:54
my question is which is convient way to use state like above observestate with live data ot collectAsstate with flow, I'm confused to which one use – Pratik Fagadiya Mar 20 '23 at 07:00

score 0 · Answer 3 · answered Jul 08 '23 at 16:39

0

CollectAsStateWithLifecycle is now recommended for Android by google devs and it's lifecycle api is also stable.Flow is also recommended by devs.

answered Jul 08 '23 at 16:39

Premjit

37
8

Jetpack Compose - Unresolved reference: observeAsState

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