Firebase Android: onDataChange() event always executed in Main UI Thread?

Question

In an Android application using Firebase, I need to execute long operations in background once Firebase returns a query answer. E.g.:

query.addListenerForSi         


        

Answer 1

Might be a little too late to the party, but if you want Firebase to return call backs on the background thread, you can use the BACKGROUND_EXECUTOR from com.google.firebase.firestore.util.Executors.BACKGROUND_EXECUTOR like

.addOnCompleteListener(BACKGROUND_EXECUTOR, OnCompleteListener {
   ...
}

There are other executers as well like -

DEFAULT_CALLBACK_EXECUTOR
DIRECT_EXECUTOR