Hi everyone, I’m trying to find the best way to convert a

LiveData

that represents a UI state into a

StateFlow

. My initial live data code looked like this:

private val _state = MediatorLiveData<State>().apply {
    addSource(livedata2) { value2 -> value?.let { it.copy(someVariable = value2) } }
    value = State(someVariable = "initial value", someOtherVariable = "another initial value")
}
val state: LiveData<State> = _state

The idea is that I have an initial value and also part of the state gets updated whenever a new value is triggered on

livedata2

To reach the same behavior using flows, I modified

livedata2

to be a SharedFlow (I’ll call it

flow2

) and my

_state

became a StateFlow. However I have to

collect

the flow2 instead of just applying an operator.

private val _state = MutableStateFlow(
        State(
            someVariable = "initial value",
            someOtherVariable = "another intial value"
        )
    ).apply {
        viewModelScope.launch {
            flow2.collect { value2 -> emit(value.copy(someVariable = value2)) }
        }
    }

val state: StateFlow<State> = _state

While it does work, I feel like this is probably not the way to go? Maybe there’s an operator for that. (I tried to use

_state.combine(flow2)

but my state was not being updated for new events on

flow2

) I there a better way to achieve the same result?

google officially release a safer ways to collect the flow: https://medium.com/androiddevelopers/a-safer-way-to-collect-flows-from-android-uis-23080b1f8bda

Thanks @miqbaldc I’ve read the article, but it is giving guidance on how to collect the flows on the view layer safely (considering the fragment/activity lifecycle). But in this case, I’m trying to merge together 2 sources of information on the

viewModel

layer. The resulting stateFlow will actually be collected automatically using data binding in my implementation. I still wonder if there is an operator that allows me to replace the

.addSource

usage effectively without the need to collect the intermediate flow (

flow2

in this case)

Ah I see, looks like we need to wait for either Google add an API extensions as alternative of

addSource

when using

Flow

:(