Challenges and lessons from porting a complex iOS app to Android

Transcript

1. Challenges and lessons from porting a complex iOS app to Android Mike Dai Wang
2. “We have this iOS app, now let’s port it to Android!”
3. Agenda 1 - The iOS app & cutting scope 2 - UI Design 3 - Process 4 - Architecture 5 - Lessons & challenges
4. 1 - The iOS app & cutting scope
7. Admin Fan Messaging Scorekeeping Play by Play Game Recap Live Game Stream Player Stats Scheduling Roster / Lineup Teams IAP Baseball Logic
8. Easy to decide what to do Hard to decide what not to do
9. Admin Fan Messaging Scorekeeping Play by Play Game Recap Live Game Stream Player stats Scheduling Roster / Lineup Teams IAP Baseball Logic
10. 2 - UI Design
17. 3 - Process
18. Let engineers focus on engineering - CI & CD - Standardize coding style - Setup automation pipeline - Make use of tools - Have good test coverage
19. PR Quality Check Unit Tests Connected Tests Code Review QA Alpha Beta
20. Make use of great tools - Alternatives to Jenkins: Bitrise.io, Fastlane - Crash reporting: Crashlytics - Error tracking / logging: Rollbar - Analytics: Firebase, Facebook, Snowplow
21. Get up to speed on Android quickly - Rely on automated checks and tests - Crash course on view lifecycle & Android SDK - Learn by doing - Modularize & limit impact - Decouple from Android - No one on an island alone
22. 4 - Architecture
23. Things to keep in mind - Engineers are new to Android - Efficient & parallel development - Maintainable - Testable - Technical debt
24. Dependency Injection - Dagger App Scope User Scope Team Scope Game Scope
25. Admin Fan Messaging Scorekeeping Play by Play Game Recap Player stats Roster / Lineup Teams Baseball Logic
26. Model View Presenter - Why?
28. RxJava / Information Flow View Presenter Repository Network Database Service Rx stream
30. Admin Fan Messaging Scorekeeping Play by Play Game Recap Player stats Roster / Lineup Teams Baseball Logic
31. Messaging Game Recap Baseball Logic
32. 5 - Lessons & Challenges
33. Custom drawings & animations
36. Rx - More than just Observable
37. Rx - Don’t break the chain
38. Rx - Subjects Rx - Subscriptions
39. Dagger - Scope depth - Use multi-binding or AndroidInjector - Component caching & reuse - Bloated application class - Asynchronous injection - Inject Observables
40. Results
41. - App launched by 5 month mark - Built an Android team - 4.5* review - biggest complaint: missing iOS features ¯\_(ツ)_/¯ - 99.6% crash free - >100k downloads - People are paying $
42. Q & A