Hi everyone, using Orbit's testing framework, is there a way to ensure that no more states/effects are emitted? I need to make sure that my container stays in a particular state after a particular intent has been fired

Hi, I have a more MVI-related question. In my app I have a number of logically related screens such as a questionnaire where multiple screens are displayed with questions and then finally a result screen is shown. These screens share a view model (which seems the correct thing to do). The issue arises where state needs to be kept across screens (but not necessarily displayed). So for example, a flow of screens is started with some important information at the beginning (say the questionnaire was started in beginner or advanced mode and this is needed at the last step to talk to some api. I could store the information as an instance field in the view model but you have to be careful about making sure fields are set before using and then reset as view models can outlive the screens. I was wondering could I put this state into the view state class? Or is this not a good idea?

Hi, if you have a button that triggers a navigation event, is it worth passing through the VM?

Hi, the state objects i define end up containing a lot of nulls. The examples I’ve seen usually use numerics or lists which are easy to initialise to non-null values. But what about strings or complex data structures? I attempted to make my state object a sealed class hierarchy but I couldnt work out how to reduce it. I guess I am looking for validation that I’m doing it correctly (as I can’t find any complex examples to learn from)

Hi, I have a main screen that shows your status. You go off to other screens that update your status and then you return to the main screen. Problem is that I am not sure how to best refresh the status? No intents are firing on return (I think the last State is displayed but its no longer valid).

What do you folks thought about https://square.github.io/workflow/?

Hi, I am trying to add a

delay

but I dont know how to do this as i get the error about not being in a suspend function when inside an `intent`block.

Hi all ! How do you handle your TextFiled and their values in your ContainerHost/State ? I tried everything I found online but I keep having this issue : https://github.com/orbit-mvi/orbit-mvi/issues/82

Any references/guidances when to define States or SideEffect for this usecase? 1. Initial State 2. Get User 3. Upload Photo Profile 4. Update User Profile 5. Get User (to update preferences) This is our current implementation in 🧵

Question regarding new androidx lifecycle (2.4.0) and the article https://medium.com/androiddevelopers/a-safer-way-to-collect-flows-from-android-uis-23080b1f8bda Isn’t the proper way to bound to the lifecycle is like?

@Composable
fun <STATE : Any, SIDE_EFFECT : Any> ContainerHost<STATE, SIDE_EFFECT>.collectAsState(
    minActiveState: Lifecycle.State = Lifecycle.State.STARTED
): State<STATE> {
    val lifecycleOwner = LocalLifecycleOwner.current
    val lifecycleAwareStateFlow = remember(this, lifecycleOwner) {
        container.stateFlow.flowWithLifecycle(lifecycleOwner.lifecycle, minActiveState)
    }
    return lifecycleAwareStateFlow.collectAsState(currentState)
}

Do you think it is possible to move the project to new coroutines lib? I wonder what side effects it could bring 🤔 https://blog.jetbrains.com/kotlin/2021/12/introducing-kotlinx-coroutines-1-6-0/#kotlinx-coroutines-test-update

Hey guys, is there a chance someone could have a look at that PR? https://github.com/orbit-mvi/orbit-mvi/pull/97 It's to support the new Macbook M1

Any recommendation to pass a

State

&

Side-Effect

to a Composable screen, instead of passing the

ViewModel

?

ViewModel

ref based on: https://github.com/orbit-mvi/orbit-sample-stocklist-jetpack-compose/blob/main/app/[…]otlin/org/orbitmvi/orbit/sample/stocklist/list/ui/ListScreen.kt Code in 🧵 1️⃣ , 2️⃣ or 3️⃣ ?

Any recommendation for this question https://stackoverflow.com/questions/68483347/android-mvi-using-stateflow-and-paging-3 ?

Hi, I am trying to write my first unit test for my viewmodel but it doesnt work

Hi, is the reason that I have to pass a

State

to the

test

method in my unit tests so that I can fast forward to any point in the state machine? Its just strange passing it in when the viewmodel should do the initial state. Would it not be better as an optional parameter for when you do want to skip the initial state?

Hi, can someone explain the

runOnCreate

method? Is it always required? I am writing tests for my viewmodels on android.

Hi, a couple of bugs on GitHub have had no responses, one of them is preventing me from testing an important screen in my app. Any idea when someone will look at them?

Hey guys, I'm trying to do something with Orbit's testing framework and basically the test finishes too early and so my assertion fails. I'm trying to simulate an empty state in a Repository's Flow that should trigger a refresh, here's the code:

class MyContainerHost(
    scope: CoroutineScope,
    val repositoryFlow: Flow<String?>, // Flow representing repository state
    val requestRefresh: () -> Unit
) :
    ContainerHost<String, String> {
    override val container: Container<String, String> =
        scope.container("initial") {
            // When creating the container, listen for update on the Repository flow
            scope.launch {
                repositoryFlow.collect { newState ->
                    intent {
                        // When no state in flow, refresh it
                        if (newState != null) {
                            reduce { newState }
                        } else {
                            requestRefresh()
                        }
                    }
                }
            }
        }
}

The thing is when I write a unit test for that, the test returns before being able to get into my

collect{}

block. How would you deal with that? Thanks

Hi All, I'm currently facing some issues with my code and Orbit-MVI and don't fully get why this happens and how to fix. I'm using a Android Jetpack Compose function with following code:

@Composable
fun MyComposeApp(modifier: Modifier = Modifier, viewModel: MyAppViewModel = getStateViewModel()) {
...
ConstraintLayout(modifier = modifier
        .pointerInput(Unit) {
            detectTapGestures(
                onLongPress = {
                    Log.d("xxx","TabGestures: longPress recognized")
                    viewModel.switchToEditMode(true)
                })
        }

My state class look like this:

data class MyAppState(
    ...
    val editMode: Boolean = false,

MyAppViewModel:

class MyAppViewModel(
    private val repository: MyAppRepository,
    private val savedState: SavedStateHandle
) : ContainerHost<MyAppState, Nothing>, ViewModel() {

    override val container = container<MyAppState, Nothing>(
        MyAppState(...)
    ) {
        ...
    }

    fun switchToEditMode(editMode: Boolean) {
        Log.d("xxx","1 switchToEditMode: $editMode")

        intent {
            Log.d("xxx","2 switchToEditMode")

            reduce {
                state.copy(
                    editMode = editMode,
                    ...
                )
            }
            Log.d("xxx","3 switchToEditMode")
        }
    }

My code is embedded in some Fragment pages with a pager implementation. The Compose code is rendered on one of those Fragments. Due to some legacy code and extended Drag&Drop functionality I was not able to use Compose for the rest of the Fragment pages. On that legacy Fragment pages (Kotlin code) I'm using Drag&Drop functionality enabled by long-press. This code and all the relevant classes are separated from the Compose code (see above). So there shouldn't be any interference. The only code they share is the whole fragment pager logic. But the content of this single compose ui is embedded like this:

class MyComposeFragment : Fragment() {

    val myAppViewModel: MyAppViewModel by viewModel()

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        return ComposeView(requireContext()).apply {
            setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed)
            setContent {
                HomeTheme {
                    MyComposeApp(Modifier.fillMaxSize(), MyAppViewModel)
                }
            }
        }
    }
}

Bug scenario: As long as I do not perform any drag&drop on those legacy code pages, the Compose impl. and Orbit code works like charm. Then I perform a drag&drop gesture on those non Compose code pages and swipe back to my Fragment using the Compose code above. The Compose code on longpress calls:

viewModel.switchToEditMode(true)

and the Log is printed. This now leads to my viewModel where the following function is called:

fun switchToEditMode(editMode: Boolean) {
        Log.d("xxx","1 switchToEditMode: $editMode")
...

This log is printed as well but it seems that the complete intent { } block is not going to be executed anymore. At least I cannot see my logs in there. NOTE: Clicks on the Compose UI are still possible and show a result and also the long-press gesture seems to be recognized correctly. It's just that the intent block is not executed anymore. Can anybody give a hint or explain to me why and in what situations the intent {} block will not be executed anymore? How can I fix or work-around? Help is highly appreciated.

Whats the correct way to check state property ensuring thread safety. For example

data class MviState(val isChecked: Boolean)

Inside ViewModel ...

fun doSomething = intent {
   if(mviState.isChecked) {  --------------> how to ensure its thread safe here. (reduce block is thread safe) 
      postSideEffect(SideEffect.Something)
   }   
}

Hey all, I saw that iOS is in Alpha stage. Is there any documentation to be able to use it? Gradle doesn’t sync in common main in adding mvi-orbit project.

Is there anything in the Orbit Testing library that prevents an intent from throwing an Exception and crashing? One of my

intent

blocks has to throw an Exception to signify that the test has failed, I can see the Exception being passed to my

CoroutineExceptionHandler

where I throw it, but the test somehow still passes

Hey guys, when do you plan on making a release with this? https://github.com/orbit-mvi/orbit-mvi/pull/100

Hi, I want to use the orbit-core for a multiplatform app targeting also js. Would it be possible to simply add a js target to the orbit-core module which implements the Blocking.kt mechanism just like the jvm target? I am also wondering why the

runBlocking

function is even an expected declaration in the common module when it is implemented the same way in jvm and ios? Thanks in advance.

Looking into a sample code from

orbit-mvi/orbit-mvi

, compose effect are wrapped with

LaunchedEffect

Strangely in our case, we were unable to observe same sideEffect twice tho Does it compose

LaunchedEffect

are not meant to observe same sideEffect, or maybe any other alternative?

Hi, I’m showing countdown timer on ui served from viewModel .

MVI state

data class VideoState(val currentTime: Long, 
                      val totalTime: Long,
                      val title: String)

UI (Fragment)

renderData(state: VideoState) {
 binding.timerTextView.text = "$state.currentTime"
 binding.durationTextView.text = "$state.totalTime"
 binding.title = "$state.title"
}

only

timerTextView

will update but

durationTextView

&

title

will remain same still

renderData

will set everything. Is there any performance again if we want to update part of the view? If so whats the better to do that? Hoping for a

onBindViewHolder

with

payload

kind of approach

Orbit v4.3.1 is released https://github.com/orbit-mvi/orbit-mvi/releases/tag/4.3.1 This is a minor release with the following features: Features • Support for Apple Silicon simulators • Updated to Kotlin 1.6.10 and coroutines 1.6.0 Fixes • Minor documentation fixes • Add package to compose utility functions • Fix smart casting in reducers As always, massive thank you to our community for the suggestions, discussions and contribution 🙇 cc @Benoît

How do I test what was emitted from the view model?