What is the purpose of anko-recyclerview-v7-corout...

# android

[andre.artus]

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.

[andre.artus]

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

[sindrenm]

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

[sindrenm]

As with many other Anko libraries, it adds convenience extension functions. simple smile

[andre.artus]

Those listeners are already on the RecyclerView.

[andre.artus]

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

[andre.artus]

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

[andre.artus]

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]

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

[sindrenm]

By using launch and invoking the handlers in its callback.