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

Question

I'm trying to replace my Handler method with RxJava.
My requirement:

I want to call the method getTransactionDetails() only after 5 seconds.

This my working code using Handler:

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

Rx java code - it's not working:

Observable.empty().delay(5000, TimeUnit.MILLISECONDS)
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .doOnNext(o -> getTransactionDetails())
        .subscribe();

question from:https://stackoverflow.com/questions/42122041/how-to-call-a-method-after-a-delay-in-android-using-rxjava

Answer 1

This is how I would do it:

    Completable.timer(5, TimeUnit.SECONDS, AndroidSchedulers.mainThread())
        .subscribe(this::getTransactionDetails);

A Completable represents a deferred computation with no value but an indication for completion or exception. The static method call timer() returns a Completable that signals completion after the specified time period has elapsed, and the subscribe() call will mean that the method getTransactionDetails() will be called on the current object when the timer fires. By supplying a Scheduler as the last argument to Completable.timer() you control which thread is used to execute getTransactionDetails().