Reactive Android Patterns

@colinmlee

Who Are You?

Colin Lee

Android Software Engineer

@ Colin The Shots LLC

Twitter: @colinmlee

Slides!

http://slides.com/colinlee/deck-2

All examples are at http://github.com/colintheshots

1. Retrofit Your Network

2. Reactive Database

3. Create() Your Own

4. Replacing AsyncTask

5. Hot vs Cold

6. When to Unsubscribe()

7. FlatMap() vs Map()

8. FlatMap() to Chain Retrofit

9. Forking Your Chain

10. Zip() All the Things!

11. Concat() All the Caches!

12. PublishSubject As Event Bus

13. BehaviorSubject for Tracking Values

14. RxBindings for Views

15. Debounce() to Autocomplete

16. TestScheduler

17. Compose() to

Re-Use

18. Observables As Finite State Machine

Gotchas

• No schedulers, RxJava is synchronous on main thread
• Use flatmap() instead of nesting subscribe callbacks
• Saving results to fields breaks functional contract
• Observable.just() and Observable.from() may block until parentheses are evaluated, use Observable.defer()
• Watch out for memory backpressure and ring buffer
• Unsubscribe when no longer needed

Questions?

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