Handler
classHandler().postDelayed({
TODO("Do something")
}, 2000)
Timer
classTimer().schedule(object : TimerTask() {
override fun run() {
TODO("Do something")
}
}, 2000)
// Shorter
Timer().schedule(timerTask {
TODO("Do something")
}, 2000)
// Shortest
Timer().schedule(2000) {
TODO("Do something")
}
Executors
classExecutors.newSingleThreadScheduledExecutor().schedule({
TODO("Do something")
}, 2, TimeUnit.SECONDS)
You have to import the following two libraries:
import java.util.*
import kotlin.concurrent.schedule
and after that use it in this way:
Timer().schedule(10000){
//do something
}
A simple example to show a toast after 3 seconds :
fun onBtnClick() {
val handler = Handler()
handler.postDelayed({ showToast() }, 3000)
}
fun showToast(){
Toast.makeText(context, "Its toast!", Toast.LENGTH_SHORT).show()
}
val timer = Timer()
timer.schedule(timerTask { nextScreen() }, 3000)
There is also an option to use Handler -> postDelayed
Handler().postDelayed({
//doSomethingHere()
}, 1000)
I recommended using SingleThread because you do not have to kill it after using. Also, "stop()" method is deprecated in Kotlin language.
private fun mDoThisJob(){
Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate({
//TODO: You can write your periodical job here..!
}, 1, 1, TimeUnit.SECONDS)
}
Moreover, you can use it for periodical job. 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.
@canerkaseler
If you are looking for generic usage, here is my suggestion:
Create a class named as Run
:
class Run {
companion object {
fun after(delay: Long, process: () -> Unit) {
Handler().postDelayed({
process()
}, delay)
}
}
}
And use like this:
Run.after(1000, {
// print something useful etc.
})
You could launch
a coroutine, delay
it and then call the function:
/*GlobalScope.*/launch {
delay(1000)
yourFn()
}
If you are outside of a class or object prepend GlobalScope
to let the coroutine run there, otherwise it is recommended to implement the CoroutineScope
in the surrounding class, which allows to cancel all coroutines associated to that scope if necessary.
If you're using more recent Android APIs the Handler empty constructor has been deprecated and you should include a Looper. You can easily get one through Looper.getMainLooper()
.
Handler(Looper.getMainLooper()).postDelayed({
//Your code
}, 2000) //millis
If you are in a fragment with viewModel scope you can use Kotlin coroutines:
myViewModel.viewModelScope.launch {
delay(2000)
// DoSomething()
}
Source: Stackoverflow.com