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Questions tagged [kotlin-sharedflow]

52 questions
16
votes
2 answers

Use of SharedFlow in Android kotlin

Hey I am learning flow in kotlin. I am learning about MutableStateFlow and MutableSharedFlow. I tried to learn MutableStateFlow in real world example. But I am unable to get the MutableSharedFlow example, which place it suits more. I tried some…
Kotlin Learner
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12
votes
1 answer

MutableSharedFlow - difference between replay and extraBufferCapacity

MutableSharedFlow takes 3 parameters: replay, extraBufferCapacity and onBufferOverflow. What is the difference between replay and extraBufferCapacity? The documentation mentions the following: replay - the number of values replayed to new…
Christian C
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12
votes
2 answers

channel or mutablesharedflow , which one is a better replacement for deprecated localbroadcastmanager

In the past, I was using LocalBroadcastManager and EventBus in my chat and taxicab applications which are now either deprecated or not recommended using them. I intend to replace them with new data structures like mutablesharedflow or channel, i…
sok sok
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9
votes
1 answer

how to avoid repeatOnLifecycle excute again and again when fragment resume

how can I avoid the collect{} code execute again when navigate back to the fragment. ViewModel class private val _commitResult = MutableStateFlow>(mapOf()) val commitResult: StateFlow> =…
Freddy
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8
votes
5 answers

StateFlow last value is collected again in ui

So lately I've been working with StateFlow, SharedFlow, and Channels API's but I'm struggling with one common use case while trying to migrate my code from LiveData to StateFlow in the presentation layer. The problem I'm facing is when I emit my…
Elias Bellido
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6
votes
3 answers

SharedFlow is not collecting from emission

In my ViewModel, I am making API requests and I am using StateFlow and SharedFlow to communicate with the Fragment. While making the API request, I am easily able to update the state flow's value and it is successfully collected in the Fragment. But…
Nishant Jalan
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5
votes
0 answers

Clearing SharedFlow: Converting flow to mutableFlow

I've an API that returns flow which I'm converting to sharedFlow using shareIn(). I've a use case where I want to reset the cached value in the sharedFlow and force the flow to fetch new data. We've a resetReplayCache() however it's only available…
user2498079
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5
votes
2 answers

LiveData Transformation to StateFlow / SharedFlow

What is the equivalent code for this live data transformation in StateFlow / SharedFlow? val myLiveData: LiveData = Transformations .switchMap(_query) { if (it == null) { …
Axel
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4
votes
1 answer

Run a kotlin flow once but have it received twice downstream

Scenario I have a hot flow EventHandler.sharedFlow emitted on a button click. The flow is received by Repository that performs some action in OnEach{}. The repository flow is then received by two event collectors EventCollectorA and…
mars8
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4
votes
3 answers

SharedFlow in Android project not working as expected

I was trying to pass events from UI to viewModel using sharedFlow this is my viewmodel class class MainActivityViewModel () : ViewModel() { val actions = MutableSharedFlow() private val _state = MutableStateFlow(State.Idle) …
noushad_chullian
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3
votes
1 answer

Flow.stateIn() not receiving new value from it's source

I tried to combine several SharedFlow into one StateFlow using stateIn. But my StateFlow seems not updating after I emit new value to it's SharedFlow source. I found out that the problem is from how I used stateIn. Here is the simplified code I am…
Jun
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3
votes
1 answer

Android Fragment Collect SharedFlow from Shared ViewModel Issue

Currently I have a ViewPager2 Fragment (as the start destination), which holds two child Fragments: ActiveOrderFragment and CompletedOrderFragment, they both have their own ViewModels to handle the api calls (to get the active orders and completed…
Sam Chen
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3
votes
1 answer

Flow emits different values when collecting it multiple times

I created a Flow from which I emit data. When I collect this flow twice, there are 2 different sets of data emitted from the same variable instead of emitting the same values to both collectors. I have a simple Flow that I created myself. The text…
Christian C
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3
votes
1 answer

When should i collect SharedFlow events in Fragment lifecycle

I have thought that is okay to collect SharedFlow data on onViewCreated. But when i replace fragment n times then fire some event to SharedFlow, it emits n times event to me instead of one event. I have fixed it how i put my code on onCreate at my…
Gökberk Yağcı
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3
votes
1 answer

Kotlin SharedFlow combine operation. Have zip behaviour in a specific situation

I'm combining two SharedFlows and then performing a long working operation. At the start, I know the state so I emit a "starting value" for both the flows. After that user can emit to either flows. Both flows are mostly independent but in a specific…
Favolas
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