How to trigger recomposition when observing LiveData

Question

I'm migrating an app from views to compose and am trying to trigger a schedule update every five minutes in which if there is a change in the data compose should recompose. Still using RxJava in my vm, but I see getDataList() get called every 5 minutes, but I'm unsure how to update the list when dealing with state.

Here's my code so far: In compose

 val dataList by viewModel.data.observeAsState() LaunchedEffect(Unit) { while(true) { viewModel.getDataList() delay(5 * 60 * 1000) } }

In viewmodel

private val _data = MutableLiveData<List<Item>>() val data: LiveData<List<Item>> = _data fun getDataList() { compositeDisposable.add(repository .getData() .subscribe( { data -> _data.postValue(data) }, { it.printStackTrace() })) }

You should probably switch out the LiveData with a flow: kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-rx2 — tyg
– tyg, Commented May 10, 2024 at 21:56

3mpty · Accepted Answer · 2024-05-10 23:33:35Z

LazyColumn and derivatives are pretty straightforward:

 val dataList by viewModel.data.observeAsState(emptyList()) LazyColumn { items(dataList, key = { item -> item.id }) { data -> Text("Something $data") } }

key is optional, but it's a good optimization to reduce number of recompositions. Inside the itemContent @Composable closure you define how each item should be rendered - in my case a simple Text

Thanks, but I'm looking for a way to trigger the data to be fetched and my composables to be recomposed every 5 minutes.

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