What is the purpose of anko recyclerview v7 coroutines and h kotlinlang #android

What is the purpose of anko-recyclerview-v7-coroutines, and how does one use it? I cannot find much of anything using Google beyond either the GitHub repo or casual mentions of it as dependencies.

Just to be clear, I understand what co-routines are, it's what is is adding to the recyclerview that's the question.

sindrenm

06/01/2018, 12:28 PM

From the source code¹, it looks like it adds the following: –

fun RecyclerView.onChildAttachStateChangeListener

–

fun RecyclerView.onItemTouchListener

¹ https://github.com/Kotlin/anko/blob/master/anko/library/generated/recyclerview-v7-coroutines/src/ListenersWithCoroutines.kt

As with many other Anko libraries, it adds convenience extension functions. 😒imple_smile:

andre.artus

06/01/2018, 1:45 PM

Those listeners are already on the RecyclerView.

https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnChildAttachStateChangeListener

https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnItemTouchListener

I've used RecyclerView.OnItemTouchListener in previous projects, but I'm unclear on what is added by Anko, and how to use it properly. Can one use the Anko RecyclerView co-routine library independent from the Anko RecyclerView layout builder? Does it allow processing on a background thread, as the default context is UI? The documentation is extremely sparse.

sindrenm

06/04/2018, 10:25 AM

Yeah, it seems to extend those two listeners and process stuff in the coroutine context that was provided with the extension functions, @andre.artus.

By using

launch

and invoking the handlers in its callback.

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