CODEWITHSUNDEEP
kotlindelay
Ray Paxman
Ray Paxman

Reputation: 23

How do I add a short delay, so user can see every number that was rolled. Kotlin, Android Studio

let's say I'm making a simple dnd dice roller (cause I am), I made it so it rolls a bunch of random numbers based on how many dice they want rolled and the type of dice. it then sends it to a text view one at a time(what I want); However, it only shows one number because it has no delay to let the the user see each number rolled (it only shows the last number).

How would I do that?

    else if (numTimesRolled.progress <= 4) {
            for (i in 0 until numTimesRolled.progress){
                randNum = Random.nextInt(1, diceIsComfirm)
                resultsArray[i] = randNum.toString()
            }
            for (i in 0 until numTimesRolled.progress){
                randNumDisplay.text = resultsArray[i]
            }

Upvotes: 0

Views: 239

Answers (1)

Tenfour04
Tenfour04

Reputation: 93779

Non-coroutines solution is to post Runnables:

val delayPerNumber = 500L // 500ms
for (i in 0 until numTimesRolled.progress){
    randNumDisplay.postDelayed({ randNumDisplay.text = resultsArray[i] }, i * delayPerNumber)
}

With a coroutine:

lifecycleScope.launch {
    for (i in 0 until numTimesRolled.progress){
        delay(500) // 500ms
        randNumDisplay.text = resultsArray[i]
    }
}

An advantage with the coroutine is it will automatically stop if the Activity or Fragment is destroyed, so if the Activity/Fragment is closed while the coroutine's still running, it won't hold your obsolete views in memory.

Upvotes: 1

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