Junior — Middle

Which function in the ViewModel initiates the UI update?

sobes.tech AI

Answer from AI

In a ViewModel, LiveData or StateFlow objects are usually used to update the user interface. To initiate a display update, the ViewModel changes the value in LiveData using the setValue() method (if on the main thread) or postValue() (if from a background thread).

Example with LiveData:

private val _data = MutableLiveData<String>()
val data: LiveData<String> = _data

fun updateData(newValue: String) {
    _data.value = newValue // triggers UI update if the View is observing data
}

Thus, a function that changes the value of LiveData or StateFlow in the ViewModel triggers a UI update, as the View (Activity/Fragment) observes these data and reacts to changes.

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