Why should you car about writing Reactive Mobile Apps?

Reactive programming allows you to write event-driven code. When we think about a mobile app, we can see a lot of interactions are driven by events. The user pushes a button, a background service fires an event due to updated data, the user types into a form and we show suggestions. So let's dive into this event-driven world and have a look at how to write reactive mobile apps using Rx.Net and friends.

Transcript

1. @mallibone Why should you care about writing Reactive Mobile Apps? Mark Allibone Rey Technology
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3. @mallibone Most actions on a mobile app have a reactive nature.
4. @mallibone What do you mean with reactive?
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6. @mallibone Tap Tap Tap Tap t
7. @mallibone Reactive Extensions (Rx) 🥰 Events
8. @mallibone Rx = Observables + LINQ + Schedulers Events* Threads/Tasks*
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10. @mallibone Demo Recap • Observables are just event streams • Completion and Error handling • Fluent Syntax • Filter, map etc. like LINQ • Work with multiple event stream • Timer e.g. for polling
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15. @mallibone View * Model
16. @mallibone View Controller Model
17. @mallibone View Presenter Model
18. @mallibone View Update Model
19. @mallibone View ViewModel Model
20. Model View View Model
21. Model View View Model
22. Model View View Model
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25. @mallibone +
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30. @mallibone ViewModels 101 • Properties • Commands • Stuff
31. @mallibone ViewModels 101 • Properties • Commands • Stuff
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33. @mallibone So much typing..
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35. @mallibone ViewModels 101 • Properties • Commands • Stuff
36. @mallibone Synchronous Commands
37. @mallibone Synchronous Commands
38. @mallibone Synchronous Commands
39. @mallibone Async Commands
40. @mallibone Async Commands
41. @mallibone Combined Commands
42. @mallibone Combined Commands
43. @mallibone Combined Commands
44. @mallibone ViewModels 101 • Properties • Commands • Stuff
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46. @mallibone Recap • MVVM Properties and Commands • 🔎 Debounce, Filter and Map with Rx • Multithreading • Completion Handling • Error Handling • Readonly Properties
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48. @mallibone = Rx + MVVM + “a ton of helpers™ Navigation DI Container View Lifecycle Event Extensions Dynamic Collections Validation User Confirmation Auto Persistance
49. @mallibone Criteria for Mobile Apps
50. @mallibone Criteria for Mobile Apps • Don’t Crash • Responsive • Work Offline • 10’000 other points depending on preference etc. (like design and fluff) 😱
51. @mallibone How to build an App that works offline?
52. @mallibone Option 1: Pack it before shipping Fileicon made by Freepik from www.flaticon.com Pack
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54. @mallibone Option 2: Cache the Calls Servericon made by prettycons from www.flaticon.com Request / Response
55. @mallibone Option 2: Cache the Calls Servericon made by prettycons from www.flaticon.com Request / Response Cache Request / Response
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57. @mallibone When do we refresh the cache?
58. @mallibone Cache
59. @mallibone Cache +
60. @mallibone Cache + =
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62. @mallibone Demo Recap • Task has one result • Observable can have n results • Akavache uses SQLite (multithreading enabled) • Seamless Offline experience
65. Thank you for your time! Mark Allibone @mallibone Rey Technology https://mallibone.com https://nullpointers.io http://reactivex.io/ https://www.reactiveui.net/