Kotlin coroutines UI not freezing

Question

I've checking the livedata coroutines lately and i get to something i cannot understand. why is this code (When observed) not freezing the UI?

    val lv =
    liveData (context=Dispatchers.Main){
        var x = 0
        while (true){
            emit(x++)
            delay(1000)
            println(Thread.currentThread().name)
        }
    }

Thanks.

Answer 1

delay doesn't block the thread. It just suspends your coroutine and resumes it after one second. You can change delay to Thread.sleep(1000) and your UI will be frozen because Thread.sleep will block the thread.