Handler to run task every 5 seconds Kotlin

I would like to run a certain code every 5 seconds. I am having trouble achieving this with a handler. How can this be done in Kotlin? Here is what I have so far. Also to note, the variable Timer_Preview is a Handler.

[![My Code][1]][1]


[1]:

Since you can't reference a lambda you're currently in, and you can't reference the property you're defining while you're defining the lambda you're assigning to it, the best solution here is an [`object` expression](

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):

val runnableCode = object: Runnable {
override fun run() {
handler.postDelayed(this, 5000)
}
}

Assuming that this property is not a `var` because you actually want to change it while this self-calling is happening.

As Kotlin does not yet allow recursive lambdas (see [KT-10350](

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)), you must use other constructs, such as object expressions as in @zsmb13's answer, or ordinary functions as below

fun StartTimer() {
Timer_Preview.postDelayed(Runnable { runnable() }, 5000)
}

fun runnable() {
//Code here

// Run code again after 5 seconds
Timer_Preview.postDelayed(Runnable { runnable() }, 5000)
}

However, in your particular case, it looks like you could just call `StartTimer()` again to re-arm the timer, assuming it doesn't do anything else:

private val RunnableCode = Runnable {
//Code here

//Run code again after 5 seconds
StartTimer()
}

You can do this with simple functions:

private fun waitToDoSomethingRecursively() {
handler.postDelayed(::doSomethingRecursively, 5000)
}

private fun doSomethingRecursively () {
...
waitToDoSomethingRecursively()
}

Simply Use `fixedRateTimer`

fixedRateTimer("timer",false,0,5000){
[email protected] {
Toast.makeText(this@MainActivity, "text", Toast.LENGTH_SHORT).show()
}
}

Change initial delay by setting another value for the third parameter.

I recommended **SingleThread** because it is very useful. If you would like to do job for each second, you can set because parameters of it:

> Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit);

TimeUnit values are: NANOSECONDS, MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS.

**Example:**

private fun mDoThisJob(){

Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate({
//TODO: You can write your periodical job here..!

}, 1, 1, TimeUnit.SECONDS)
}