EventBus, register and registerSticky method

问题:

I use greenrobot EventBus library to send data between two fragments in my android app and I want to know what is the diffeence between register(Object b) method and registerSticky(Object object) method?

回答1:

EventBus allows you to post events that are "sticky" and by that EventBus understands events that "stick to the eventbus" for future access.

If you post a normal event when there are no subscribers registered at the moment of sending, this event will be discarded.

You can post a sticky event though, even if there are no subscribers to receive that at the moment, and it won't be discarded (unless there is another sticky event posted in the future). When a subscriber registers with registerSticky the delivery of the last sticky event is also triggered.