How do you know when to switch to another dispatcher? On android, when performing a network request within a viewModel scope, my understanding okhttp will perform the fetching task on a background thread. So when I get the response, and want to massage the data before sending to the UI, is this work ok for the main thread? Or do I need to switch to another Dispatcher at this point?

viewModelScope.launch {
   val myResponse = fetchMyData() // okhttp moves this work to a background thread
   doSomethingWithMyResponse(myResponse) // Does this need to be done on a background thread using withContext?
}

Since okhttp does threading in a different thread, you don't have to switch to

<http://Dispatcher.IO|Dispatcher.IO>

, the main thread will suffice.

note that unless you're using okhttp's async api, it is blocking, but it's quite easy to adapt it using

suspendCancellableCoroutine