CODEWITHSUNDEEP
androidkotlinandroid-livedatakotlin-coroutines
TRose
TRose

Reputation: 482

while true in Coroutine LiveData

I'm using coroutine livedata to do some stuff every 4 seconds. This is the code I used

val reloadInterval: MutableLiveData<Long> = MutableLiveData()
val data = reloadInterval.switchMap { delay ->
    liveData(Dispatchers.IO) {
        while (true) {
            delay(delay)
            emit(data)
        }
    }
}

fun reloadInterval(interval: Long) {
    reloadInterval.value = interval
}

So my question is when I change the reloadInterval value the switchMap flow get triggered and return a new livedata then will the old livedata still running or it will stopped automatically ?

Upvotes: 0

Views: 752

Answers (2)

EpicPandaForce
EpicPandaForce

Reputation: 81578

The liveData { coroutine builder's block is only executed while the LiveData is active. The block runner is cancelled after a given timeout period, which is by default 5 seconds.

So while(true) { will stop after 5 seconds. You can pass liveData(timeoutInMs = 0) { to immediately terminate the loop.

Upvotes: 1

R&#243;bert Nagy
R&#243;bert Nagy

Reputation: 7690

As long as you don't keep a subscription to the old livedata, it should should become inactive. See LiveData.onInactive() for more information

Upvotes: 1

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