Coroutine Context Switching Made Easy

Kotlin Coroutines are great, there’s no denying that. But on Android, the CoroutineContext matters so much; LiveData and the UI need to be updated on Dispatchers.Main, database and network operations need to be on Dispatchers.IO, and everything else probably belongs on Dispatchers.Default. So we end up with code like this:

withContext(Dispatchers.IO) { databaseQueryFunction() }.let { 
    withContext(Dispatchers.Main) { 
        liveData.value = it 
    } 
}

Ideally, we’d have something like this:

onIO { databaseQueryFunction() }.onMain { liveData.value = it }

Lucky for you, I just added this to my (super small) ktx library. Give it a go and let me know what you think in the comments 😀.

percula/ktx