Cloud Firestore: can cache be read synchronously?

Can documents be retrieved synchronously from the cache?

For Android, the documentation only gives an asynchronous example?

DocumentReference docRef = db.collection("cities").document("SF");
docRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
    @Override
    public void onComplete(@NonNull Task<DocumentSnapshot> task) {
        if (task.isSuccessful()) {
            DocumentSnapshot document = task.getResult();
            ...
        }
    }
});

UPDATE:

It seems to me that the onComplete gets called only when the data is coming from the server. It doesn't seem to get ever called with cached data.

Can anyone confirm?