I’ve got the following code (Android): ```corouti...

# coroutines

[Tim Malseed]

I’ve got the following code (Android):

coroutineScope.launch {
    val songs = mutableListOf<Song>()
    mediaProvider.findSongs().collect { (song, progress) ->
        songs.add(song)
        listeners.forEach { listener -> listener.onProgress(progress, song) }
    }

    listeners.forEach { listener -> listener.onComplete() }
}

The scope is instantiated via CoroutineScope(Dispatchers.Main)

Despite listener.onProgress being called on the main thread - and successful log messages when it is called, the UI updates I’m making in response don’t seem to have any effect.

Are the listener.onProgress(progress, song) calls somehow being gathered up and then all executed at the end?

Ooh I think I might be blocking the main thread somewhere

[octylFractal]

unless you're `suspend`ing somwhere, you are still blocking the Main thread -- I presume findSongs() is a Flow, but did you move it off of the main thread while it works?

[Tim Malseed]

Huh. You know, I did have a .flowOn(<http://Dispatchers.IO|Dispatchers.IO>) call, but I’ve accidentally removed it at some point. That will be it!

[Tim Malseed]

Its taken me about 2 hours of debugging to come to write this post and then as soon as I did I realise I must be blocking the main thread

[Tim Malseed]

Thanks @octylFractal

[Tim Malseed]

That was it 🙂