Preview Driven Development

Here are the slides for my talk at Android Worldwide.

Transcript

1. Rikin Marfatia — Android @ Pinterest — @heyrikin Preview Driven Development™ Avoid build times at all cost!
2. Agenda Compose + Previews 101 Previews —> Isolated Features Dependency Fakes Gradle Strategy for Previews Real World Example
3. Compose + Previews
4. Jetpack Compose Declarative UI @Composable functions Previews for visualization Android is fun again
5. @Previews
6. Deploy Previews to Device
7. Powerful in-IDE Support
8. Faster UI Development
9. Isolated Features
10. Isolated Features Built “isolated” from the rest of the application Simulate inputs Stub out side effects + outputs
11. Mini Apps (Sample Apps) Run each feature as an app Composition of features Setup for modularization
12. Other Benefits Feature Teams Easy Testing + Refactoring Non-engineers can play with Previews
13. Faking Dependencies
14. Control your Environment Real Application Real Application - No Internet Fake Feature
15. Real Dependencies are Expensive 💰💰💰 import InnocentDependency Retrofit OkHttp Room SqlLite KAPT
16. Interface + Implementation
17. Gradle Strategy
18. Gradle Modules — Before App Feature Common Feature Feature Network
19. Gradle Modules — After App Feature NetworkLive Common Feature Feature Network FeaturePreview FeaturePreview FeaturePreview
20. Interface + Live Modules App Feature NetworkLive Common Feature Feature Network FeaturePreview FeaturePreview FeaturePreview
21. Full Application App Feature NetworkLive Common Feature Feature Network FeaturePreview FeaturePreview FeaturePreview
22. Feature Preview App Feature NetworkLive Common Feature Feature Network FeaturePreview FeaturePreview FeaturePreview
23. Demo
24. Takeways Previews are extremely powerful, start using them Separate interface/fakes + implementation in Gradle Having fast deployable features is AWESOME Long build times SUCK
25. How to apply this today? - Gradle structure works without Compose / Previews - Ralf Wondratschek — Android at Square - Start Creating Fakes - Preparing for Compose - Adam Bennet — Migrating your design system
26. Credits / Resources - Point-Free - Designing Dependencies - Modeled my talk after this series - Amazing resource - Attacking Build Times with Sample Apps - Bill Phillips @ Cash App - Demo Application Code - https:#//github.com/Rahkeen/Hail
27. Thanks @heyrikin