Custom JobIntentService onHandleWork not called

Question

I recently was updating an app that I work on to handle notifications from push using a JobIntentService instead of a regular IntentService because

Answer 1

I think that I have such problem since I try to toast some text inside onHandleWork() but actually the problem was that it was wrong. I should use a Handler. It may be the problem if one uses for example AsyncTask subclasses to execute on another thread inside onHandleWork() which is a very bad idea.