Coroutines + Android Framework Antonio Leiva 

Coroutines + Android Framework = 

What are coroutines? 

Coroutines for Android - Some libraries ● kotlinx-coroutines-android (by Kotlin team) ● async/await (by Metalab) ● AsyncAwait-Android (by Niek Haarman) ● Anko (by Kotlin team) 

Anko - coroutines embedded into the framework ● Most async functions start from a UI event ● What happens if we embed coroutines into listeners? 

Anko - coroutines embedded into the framework textView.onClick { val res = bg { findBackgroundColor() } textView.setBackgroundColor(res.await()) } 

Some examples - SearchView searchView.onQueryTextListener { onQueryTextChange { text -> progress.visible() val res = bg { doSearch(text) } updateContent(res.await()) progress.invisible() false } } 

Some examples - OnMenuItemClick toolbar.onMenuItemClick { when (it?.itemId) { R.id.action_edit -> startActivity() R.id.action_save -> { bg { save() }.await() toast("Saved") } R.id.action_delete -> { bg { delete() }.await() toast("Deleted") } } } 

Does it fit into an architecture? searchView.onQueryTextListener { onQueryTextChange { presenter.onSearchTextChanged(it); false } } --- suspend fun onSearchTextChanged(search: String?) { view.showProgress() val res = bg { searchTextInteractor(search) } updateContent(res.await()) view.hideProgress() } 

Does it fit into an architecture? toolbar.onMenuItemClick { item -> item?.itemId?.let { presenter.onActionClicked(when (it) { R.id.action_edit -> Action.Edit R.id.action_save -> Action.Save R.id.action_delete -> Action.Delete else -> throw IllegalStateException("Unknown Action") }) } } suspend fun onActionClicked(action: Action) { when (action) { Action.Edit -> view.navigateToEdit() Action.Save -> { bg { save() }.await() view.showMessage("Saved") } Action.Delete -> { bg { delete() }.await() view.showMessage("Deleted") } } } 

Does it make sense? 

Does it make sense? Probably not 

Does it make sense? fun onSearchTextChanged(search: String?) { async(UI) { view.showProgress() val res = bg { searchTextInteractor(search) } updateContent(res.await()) view.hideProgress() } } 

Thanks! Questions? 3 - 4 Junio: Bootcamp Kotlin online https/devexperto.com/bootcamp