Android Studio/kotlin how to every 60 seconds run function - android-studio

Question

I have next a fragment code:
#RequiresApi(Build.VERSION_CODES.O)
fun get_date_to_new_year(): String {
val CurrentDate = LocalDateTime.now()
val needDateToNewYear = LocalDateTime.of(2023, 1, 1, 0, 0, 0)
val DateToNewYear = Duration.between(CurrentDate, needDateToNewYear)
return "До нового года " + (DateToNewYear.toDays()).toString() + " дней\nили " +
(DateToNewYear.toHours()).toString() + " часов\nили " + (DateToNewYear.toMinutes()).toString() + " минут\nили " +
(DateToNewYear.seconds).toString() + " секунд"
}
#RequiresApi(Build.VERSION_CODES.O)
private var _text = MutableLiveData<String>().apply {
value = get_date_to_new_year()
}
#RequiresApi(Build.VERSION_CODES.O)
var text: LiveData<String> = _text
I need text variable to be updated every 60 seconds

Answer 1

If you move this to a ViewModel, it’s pretty easy using the liveData coroutine builder. No need for the MutableLiveData.
#RequiresApi(Build.VERSION_CODES.O)
val text: LiveData<String> = liveData {
while(true) {
emit(get_date_to_new_year())
delay(60_000)
}
}
If you don’t want to use a ViewModel, you could launch a coroutine in onViewCreated().
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
//..
viewLifecycleOwner.lifecycleScope.launch {
while(true) {
_text.value = get_date_to_new_year()
delay(60_000)
}
}
}
But if you’re not using a ViewModel, I think the LiveData is just an unnecessary extra layer. You could update your TextView or whatever directly in the coroutine.