How to Call a Method After a Delay in Android

How to call a method after a delay in Android

Kotlin

Handler(Looper.getMainLooper()).postDelayed({
    //Do something after 100ms
}, 100)

Java

final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        //Do something after 100ms
    }
}, 100);

How to delay some action in Android so that a task completes after a set Delay?

If you're using java to code in android Studio then I suggest you to use the Handler, that will execute your action after a determined span of time

In your activity's onCreate method do this:

 int any_delay_in_ms = 1000; //1Second interval
    new Handler().postDelayed(() -> {
        //TODO Perform your action here
    }, any_delay_in_ms);

Execute function after 5 seconds in Android

You can use the Handler to add some delay.Call the method displayData() as below so that it will be executed after 5 seconds.

new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
          displayData();
        }
    }, 5000);

Note : Do not use the threads like Thread.sleep(5000); because it will block your UI and and makes it irresponsive.

Android: How to call certain method after certain time?

Try this code to delay execution of your function:

private int DELAY = 1500; // Delay time in milliseconds

new Handler().postDelayed(new Runnable() {
           @Override
           public void run() {
              computersTurn();
           }
         }, DELAY);

How to call a function after delay in Kotlin?

You can use Schedule

inline fun Timer.schedule(
    delay: Long, 
    crossinline action: TimerTask.() -> Unit
): TimerTask (source)

example (thanks @Nguyen Minh Binh - found it here: http://jamie.mccrindle.org/2013/02/exploring-kotlin-standard-library-part-3.html)

import java.util.Timer
import kotlin.concurrent.schedule

Timer("SettingUp", false).schedule(500) { 
   doSomething()
}

How to call a method after a delay in Android

Kotlin

Handler(Looper.getMainLooper()).postDelayed({
    //Do something after 100ms
}, 100)

Java

final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        //Do something after 100ms
    }
}, 100);

How to call a method after a delay in android using rxjava?

doOnNext() is for side effects. It could be use for example for logging purpose, because logging doesn't alter the flow of data. But you want to pass down the result of getTransactionDetails(), so you should use map instead.

Second, Observable.empty() create an Observable that just propagate the finish/dispose message, it trigger neither doOnNext() neither map(). You could fix this using Observable.just() instead but a more idiomatic way would be to use Observable.timer():

Observable.timer(5000, TimeUnit.MILLISECONDS)
        .map(o -> getTransactionDetails())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe( ... );

A final note on Schedulers. Observable.timer() and delay() are executed on the computation scheduler by default so you don't need to call .subscribeOn(Schedulers.io()) to execute getTransactionDetails() outside of main thread. Observable.timer() and delay() could take a Scheduler as a parameter if you want to control this. So you need to call .observeOn(AndroidSchedulers.mainThread()) if you want to use getTransactionDetails() result on UI thread. Every operator after observeOn() is executed on the defined Scheduler, so you have to put observeOn() after computation.

Edit: This is of course if you care about the result of getTransactionDetails(). If not, see Clyde answer.

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