Hey guys, I am using LiveData coroutines KTX extension for my project. https://developer.android.com/topic/libraries/architecture/coroutines#livedata The code is something like this.

ViewModel/Repository

fun getData() = liveData {
    val a = getFromDB()
    emit(a)
    val b = getFromNetwork()
    emit(b)
}

View

viewModel.getData().observe(this, Observer{
    // do ui stuff
})

This works perfectly fine. But the problem is now I want to add Swipe to Refresh feature, and want that the entire

liveData {}

block to run again. How do I trigger a refresh call to the

getData()

LiveData? One solution which is mentioned here (https://stackoverflow.com/a/58689791) is to introduce another

MediatorLiveData

and remove and re-add the

liveData {}

block on refresh. But I don't want to add 2 LiveDatas and it also seems like a hack. Any good and elegant solution for this guys? Thanks.

In viewmodel

val myLiveData = MutableLiveData() // This is a class property in your viewmodel

fun doFetch() {
 val a = getFromDB()
 myLiveData.value = a
 val b = getFromNetwork()
 myLiveData.value = b
}

and in your View class

viewModel.myLiveData.observe(this, Observer{
    // do ui stuff
})

// Calling `doFetch()` will redo the operation and set the livedata values

As an improvement, consider also exposing myLiveData to the view as an immutable livedata

Thanks @voben for the reply. Yes, this method works perfectly. But I was looking something with the

liveData {}

block, which supports coroutines. Is it possible to use the

liveData {}

block with refresh functionality? Or should I not use

liveData {}

block? I'm little bit confused 🤔

The Livedata builder is cold and only emits when the user starts observing it. So the only way to emit again would be by detaching and reattaching the observer or by attaching a new one https://developer.android.com/topic/libraries/architecture/coroutines#livedata