Try to modularize a not so legacy Android App

Given at an internal company event.

This talk tells a story how I (and my team) tried to modularize a new Android App we developed for a customer.

Transcript

1. Try to modularize a not so legacy Android App
2. Customer: "I want an App and a SDK"
3. The obvious solution someProject/android someProject/sdk
4. The obvious solution someProject/android someProject/sdk consumes
5. The obvious solution - requirements someProject/android someProject/sdk consumes artifactory CI/CD
6. The modularization solution someProject/android /app /sdk Benefits: • No headache with artifactory and CI/CD • Development of the SDK is "on the fly" • … more?!
7. Customer: "The SDK should contain feature A,B,C and X,Y,Z"
8. The obvious solution someProject/android Packages: awesome/feature/a awesome/feature/b awesome/feature/c awesome/feature/x awesome/feature/y awesome/feature/z /sdk
9. The modularization solution someProject/android /y /c /b /a /z /x /sdk Benefits: • Each is decoupled of others • Could be published independently • Wrapper SDK provide still the full SDK • app modules could pick only features which they require • … more?!
10. Customer: "We use Scandit for scanning barcodes. Here are the licenses. Uh - and maybe we will replace it later with XYZ"
11. The obvious solution - Try to abstract it away someProject/android /app /build.gradle add licenses Implementation: awesome/scaninng/ abstract.kt scanditImpl.kt
12. The modularization solution someProject/android /app /build.gradle add licenses Implementation: awesome/scaninng/ abstract.kt internal/scanditImpl.kt /scanning Benefits: • Clear separation in our build files • scanning module can be changed without touching /app • … more?!
13. Developer: "Our onboarding is so heavily. Let's extract it"
14. The obvious solution someProject/android /onboarding /app
15. The obvious solution someProject/android /onboarding /app HELP! I need some files* from /app * files like `layouts` or utility classes
16. The obvious solution someProject/android /onboarding /app /resources /utils
17. The obvious solution someProject/android /onboarding /app /resources /utils HELP! I need some files from /sdk
18. The obvious solution someProject/android /onboarding /app /resources /a /sdk
19. The obvious (and correct) solution someProject/android /onboarding /app /resources /a /sdk
20. Audience: "Well, that looks weird and complicated"
21. Speaker: "No it's not. It's like playing lego and pick only the correct bricks together"
22. Q'nd A