How did you organize data storage and transfer in the ViewModel in your projects?

In my Android projects, I usually use LiveData or StateFlow for storing and passing data in ViewModel. LiveData allows observing data changes and automatically updating the UI, considering the component's lifecycle.

Example with LiveData:

class MyViewModel : ViewModel() {
    private val _data = MutableLiveData<String>()
    val data: LiveData<String> = _data

    fun loadData() {
        // Load data and update LiveData
        _data.value = "New data"
    }
}

I also often use StateFlow from Kotlin Coroutines, which is more flexible and well integrated with the Flow API:

class MyViewModel : ViewModel() {
    private val _state = MutableStateFlow("")
    val state: StateFlow<String> = _state

    fun loadData() {
        _state.value = "New data"
    }
}

For passing data between fragments via ViewModel, a shared ViewModel tied to the activity is used, which allows exchanging state without direct dependencies between fragments.