I can use `delay()` in any coroutine, but not when...

# anko

[hallvard]

I can use delay() in any coroutine, but not when using Anko's doAsync { }. What am I missing? How should I handle it?

[louiscad]

I'd recommend to use <http://Dispatchers.IO|Dispatchers.IO> or Dispatchers.Default with withContext & launch (or async for parallelisation in same coroutine) instead.

[hallvard]

OK. I have my Service implement CoroutineScope with a single threaded scope (override val coroutineContext = Executors.newSingleThreadExecutor().asCoroutineDispatcher()), and voilà. (I believe a single thread is OK, since this is a fairly small routine that will only query the android downloadmanager for updates every 500 millis until a certain download is finished.) Thanks for pointing me in the right direction.

[louiscad]

@hallvard Why don't you use <http://Dispatchers.IO|Dispatchers.IO> or Dispatchers.Default instead of a new executor?

[hallvard]

Ah... because I didn't want to use GlobalScope, I guess, and once I added inheritance of CoroutineScope, I was asked by Android Studio to implement val coroutineContext, and before you knew it...

[hallvard]

... so actually, I don't have to implement the CoroutineScope in my Service. If I understand this correctly, all I have to do, is CoroutineScope(<http://Dispatchers.IO|Dispatchers.IO>).launch { ... }, and the effect will be the same as with Anko's doAsync { ... }, but I'm closer to the action myself, and can do delay() if I so wish. Nice.