``` private val uiJob = SupervisorJob val uiScope = Coroutin

Question

``` private val uiJob = SupervisorJob val uiScope = CoroutineScope Dispatchers Main + uiJob val journeys = MutableLiveData lt List lt Journey gt gt fun loadJourneys = uiScope launch val token = preferences getProfileToken return launch try journeys value = journeysService getJourneys token catch e Exception showGenericError value = Unit ``` Hello i am trying coroutines with mvvm pattern What i am doing bad with this It s working but the ui is blocked while is getting journeys How can i fix this Thanks

gildor · Answer

How `getJourneys` is implemented If your UI is blocked than getJourneys is blocking function

Sergio Crespo Toubes · Answer

with suspend function

Sergio Crespo Toubes · Answer

retrofit call

gildor · Answer

Suspend function can be still blocking if implementation is not correct

Sergio Crespo Toubes · Answer

yes i think so

gildor · Answer

does it use standard retrofit suspend function support

gildor · Answer

or it s your own implementation

Sergio Crespo Toubes · Answer

``` GET api me journeys suspend fun getJourneys Header TOKEN token String List lt Journey gt ```

gildor · Answer

also ``` private val uiJob = SupervisorJob val uiScope = CoroutineScope Dispatchers Main + uiJob ``` Can be replaced with `val uiScope = MainScope `

gildor · Answer

Are you sure that you don t have any nasty call adapters that may cause blocking because it looks fine nothing should be block Also could you check does it work if you replace `getJourneys ` with `delay 5000 `

Sergio Crespo Toubes · Answer

the problem of change MainScope to BackgroundScope is that i get an error assigning result of retrofit to mutablelivedata

Sergio Crespo Toubes · Answer

for modifying ui thread in background thread

gildor · Answer

yes

gildor · Answer

I understand

gildor · Answer

as I said ecveryhing looks completely fine

Sergio Crespo Toubes · Answer

ok

gildor · Answer

gt the problem of change MainScope to BackgroundScope I do not suggesting this Also `MainScope ` is just shortcut it uses main dispatcher

Sergio Crespo Toubes · Answer

the block that i am talking about is with viewpager when i change with gesture the view

Sergio Crespo Toubes · Answer

the ui is blocked

Sergio Crespo Toubes · Answer

I will try MainScope

Sergio Crespo Toubes · Answer

Thanks Andrey

gildor · Answer

Nono It s not a solution

gildor · Answer

I just said that you can write the same shorter

Sergio Crespo Toubes · Answer

ah XD ok

gildor · Answer

also you can just get main scope from lifecycle lifecycleObserver coroutineScope

gildor · Answer

About your original problem try replace `journeysService getJourneys token ` with placeholder like `delay 5000 ` and check will your UI is still blocking or not

Sergio Crespo Toubes · Answer

ok

Sergio Crespo Toubes · Answer

I will test it this evening Andrey i cant now Thanks for all