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androidmvvmandroid-jetpack-composekotlin-coroutineskotlin-stateflow

How do I manage uiState for multiple sections?


I'm currently developing an Android app that displays multiple sections of movie lists. Each section's UI state is managed independently using separate StateFlows in the ViewModel. Here's a simplified version of my current approach:

class MovieViewModel : ViewModel() {
    private val _section1State = MutableStateFlow<UiState>(UiState.Loading)
    val section1State: StateFlow<UiState> = _section1State.asStateFlow()

    private val _section2State = MutableStateFlow<UiState>(UiState.Loading)
    val section2State: StateFlow<UiState> = _section2State.asStateFlow()

    // ... more sections ...

    // Functions to update each section
}

This works well for a small number of sections, but I'm concerned about scalability. If the number of sections grows to 100 or more, the amount of code will become unwieldy, and there will be too many management points. My questions are:

  1. What's the most efficient way to manage multiple section states in a ViewModel when the number of sections can be large and dynamic?

  2. How can I reduce code duplication and simplify state management for numerous similar sections?

  3. Are there any design patterns or architectural approaches that could help in this situation?

I'm looking for a solution that maintains the independence of each section's state while being scalable and manageable. Any insights or best practices would be greatly appreciated.


Solution

  • Your're right, for many states its time consuming way. Probably using List or Map in state would be good enough. Final way depends on your needs. Simpliest solution is to use something like

    data class StateReady(val sections: List<SectionUiState>) : UiState
    

    And then generate sections ui base on sections (maybe Recycler?)