livedata-combineutil-java VS orbit-mvi

3.) the MutableLiveDatas in the ViewModel initialized by SavedStateHandle.getLiveData should contain the fromDate and the toDate, and with the combination of these LiveDatas you can evaluate what to show on the screen

well the third-party libraries help but internally it's just MediatorLiveData which does ship with LiveData

If you're using Google's defaults, then you use a ViewModel created by Hilt and getting a reference to a SavedStateHandle, your state would be created of multiple MutableLiveDatas (each holding 1 property) created via savedStateHandle.getLiveData(), then you use MediatorLiveData (you can use a library like this or this) to combine the changes of the mutable properties into a single immutable state object observed by the "UI" (read: the view controller, aka the Fragment) using the viewLifecycleOwner property of Fragments.

MutableLiveData (java combiner/kotlin combiner) == BehaviorRelay (kotlin combiner) == MutableSharedFlow (kotlin combiner) conceptually, so it's not important to me which one it is, as long as you can throw combiners at it.

Yep, that's why I have this kotlin combiner/java combiner for LiveData, but map/switchMap also rely on MediatorLiveData.

people exposing 11 public LiveData fields for 11 private MutableLiveData fields instead of using MediatorLiveData as combiners to reduce the number of exposed LiveData fields

While it is possible to combine these properties into a single emission using MediatorLiveData, if the MutableLiveData is exposed as MutableLiveData, then the fields can be directly two-way databound to XML, which is kinda the original goal and purpose of databinding.

If you need help with combiners you can also check https://github.com/Zhuinden/livedata-combineutil-java/

If you can't join them, you can combine LiveDatas and then map them to a common representation so that the adapter can treat it as a single list. And use itemViewType to determine which view to show per each item.

Go over to the docs for orbit-mvi and show how it has these flaws.

This looks great! Semi-related question... have you evaluated other MVI frameworks like Mavericks / Uniflow / Orbit? What made you decide on Mobius?

Name Link Koin https://insert-koin.io Jetpack Compose https://developer.android.com/jetpack/compose Navigation Compose https://developer.android.com/jetpack/compose/navigation Orbit MVI https://orbit-mvi.org Coil https://coil-kt.github.io/coil/ Room https://developer.android.com/training/data-storage/room?hl=ja Kotlin-Serialiazation https://github.com/Kotlin/kotlinx.serialization PokemonGO-Pokedex https://github.com/Biuni/PokemonGO-Pokedex

Do you recommend Mavericks? I've been meaning to evaluate it and orbit-mvi.

Everything in MVI is just more code that does nothing (see how most MVI frameworks are basically just a wrapper over state.value = state.copy() like in Orbit or MvRx which you wouldn't even need if you used combiners) and instead adds unnecessary constraints over MVVM that don't help you at all. The "sealed class inputs" are basically a reinvention of calling interface functions except you create classes for it, despite there being no asynchronicity when you have a View -> ViewModel communication.

Redux is called MVI in Android world. There are plenty of MVI libs: MVICore, orbit-mvi, mobius and other.