Questions tagged [greenrobot-eventbus]

EventBus is an Android optimized publish/subscribe event bus. A typical use case for Android apps is gluing Activities, Fragments, and background threads together. Conventional wiring of those elements often introduces complex and error-prone dependencies and life cycle issues. With EventBus propagating listeners through all participants (e.g. background service -> activity -> multiple fragments or helper classes) becomes deprecated. EventBus decouples event senders and receivers and thus simplifies communication between app components. Less code, better quality. And you don't need to implement a single interface!

General Usage and API:

In EventBus, subscribers implement event handling methods and register themselves to the bus. Posted events are delivered to matching event handling methods based on their event type (the Java class/interfaces implemented by the event).

Using EventBus takes four simple steps:

1. Implement any number of event handling methods in the subscriber:

   public void onEvent(AnyEventType event) {}

2. Register subscribers:

   eventBus.register(this);

3. Post events to the bus:

   eventBus.post(event);

4. Unregister subscriber:

   eventBus.unregister(this);

More info: https://github.com/greenrobot/EventBus