Hello, I'm actually trying to implement this but ...

# android

[Harsh P.]

Hello,
I'm actually trying to implement this but it is not working out.
Can anyone help me with this?

Thank you.
https://stackoverflow.com/questions/54827455/how-to-implement-timer-with-kotlin-coroutines

[Landry Norris]

Can you describe ‘not working out’? Is the flow not emitting values? Is it crashing? Syntax error?

[Landry Norris]

I would recommend

fun tickerFlow(period: Duration, initialDelay: Duration = Duration.ZERO) = flow {
    delay(initialDelay)
    while (true) {
        emit(Unit)
        delay(period)
    }
}

as suggested by one of the answers. It’s concise and should work fine.

[Harsh P.]

I'm getting this

java.lang.NoSuchMethodError: No static method delay-p9JZ4hM(JLkotlin/coroutines/Continuation;)Ljava/lang/Object; in class Lkotlinx/coroutines/DelayKt; or its super classes (declaration of 'kotlinx.coroutines.DelayKt'

[Harsh P.]

And yes, app is crashing with above message

[Landry Norris]

have you included

implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.3")

in the build gradle?

[Landry Norris]

Looks like some jar is missing.

[Harsh P.]

One more thing, when I'm implementing I'm getting @ExperimentalTime annotation

Let me check that thing

[Harsh P.]

Mine is 1.3.3

[Landry Norris]

Try replacing delay(Duration) with delay(Long) and see if that works.

[Harsh P.]

Ok, then, I have to change the value in the whole implementation as well, right?

[Landry Norris]

fun tickerFlow(period: Long, initialDelay: Long = 0) = flow {
    delay(initialDelay)
    while (true) {
        emit(Unit)
        delay(period)
    }
}

[Harsh P.]

I tried and it worked,
Thank you very much for guidance.