Como simplificar o desenvolvimento melhorando a comunicação entre componentes Android.

1. Event Bus
Android Simplificado

3. Componentes Android
Activity Service
Fragment Fragment Custom View

4. Comunicação Android
Activity Service
Fragment Fragment Custom View

5. Delegate Android
Activity
ServiceFragment
Fragment Custom View

6. Activity se torna God Object
Activity precisa implementar diversas interfaces
Excesso de cast e instance of
class GodActivity implements A, B, C, D, E, Fuck {}
Delegate :( Android

7. Publish / Subscribe Papéis
Publisher
Event
Bus
SubscriberEvent Event

8. Event Bus Android
ServiceFragment
Fragment Custom View
Event
Bus
Activity

9. EventBus by greenrobot

10. EventBus
// Create a bus
EventBus bus = new EventBus();
// Or use the default
EventBus bus = EventBus.getDefault();
// Publish
bus.post(new AnyEvent());
https://github.com/greenrobot/EventBus

11. // Register - onCreate, onStart
bus.register(this);
// Unregister - onDestroy, onStop
bus.unregister(this);
public void onEvent(AnyEvent e) {
[...]
}
public void onEventMainThread(AnyEvent e) {}
EventBus https://github.com/greenrobot/EventBus

12. // Sticky Publish
bus.postSticky(new AnyEvent());
// Sticky Register
bus.registerSticky(this);
EventBus https://github.com/greenrobot/EventBus

13. Otto by Square

14. // Create a main thread bus
Bus bus = new Bus();
// Create an any thread bus
Bus bus = new Bus(ThreadEnforcer.ANY);
// Publish
bus.post(new AnyEvent());
Otto https://square.github.io/otto/

15. Otto
// Register - onCreate, onStart
bus.register(this);
// Unregister - onDestroy, onStop
bus.unregister(this);
@Subscribe
public void onAnyEvent(AnyEvent e) {
[...]
}
https://square.github.io/otto/

16. Otto
@Subscribe
public void onAnyEvent(AnyEvent e) {
[...]
}
@Produce
public AnyEvent produceAnyEvent() {
return AnyEvent.getLast();
}
https://square.github.io/otto/

17. Via Reflection
Fornece um Bus Default
Valor Anterior via *Sticky
Threading feita no Evento
OttoEventBus
Via Annotation
Gerenciamento Manual de Bus
Valor Inicial via @Produce
Threading feita no Bus

18. Caso de uso
Activity
Fragment
Custom View
Fragment

19. Crie Suvinil https://play.google.com/store/apps/details?id=com.basf.suvinil.crie

20. 420 LOC
0 Interfaces
Eventos organizados
Delegate EventBus
750+ LOC
9 Interfaces
Interfaces fragmentadas

21. Referências
Google Developer Experts
https://medium.com/google-developer-experts/
Event-driven programming for Android (part I)
https://medium.com/google-developer-experts/event-driven-programming-for-android-part-i-f5ea4a3c4eab
Event-driven programming for Android (part II)
https://medium.com/google-developer-experts/event-driven-programming-for-android-part-ii-b1e05698e440
Event-driven programming for Android (part III)
Em breve...

22. @mickele@ademar111190