Android Instant Apps allow users to access certain app features without installing the full app. They are built using a feature module structure and trimmed down to under 4MB in size to optimize for discovery, performance, and privacy. Developers can refactor existing apps into this model by identifying core features, removing unused resources and dependencies, and following best practices for instant app UX and architecture. Unsupported features include background services, broadcast receivers, and externally accessible content providers.

1. Android Instant App

2. Native Android apps, without the installation
Android M+

3. FROM Building an Android Instant App (Google I/O '17)

4. FROM Android Instant Apps | Android Developers

5. FROM Android Instant Apps | Android Developers

6. Discoverability
✘ Android App Links
✘ From other instant and installable app
FROM Building an Android Instant App (Google I/O '17)

7. Security & Privacy
✘ Runtime permission API
✘ User resettable Ad ID and Android ID
✘ Limited device-specific information
✘ No broadcast receivers
FROM Building an Android Instant App (Google I/O '17)

8. Performance
✘ Trim the fat
✘ Slice the binary
FROM Building an Android Instant App (Google I/O '17)

9. FROM Developer Keynote (Google I/O '17)

10. https://codelabs.developers.google.com/codel
abs/android-instant-apps/index.html

11. Prerequisites
✘Update Android Studio to 3.0 Canary
✘Fetch sample project
✗ $ git clone https://github.com/googlecodelabs/android-topeka.git
✘Install Instant App SDK

12. Step 1
Moving existing code into a feature module
FROM Google Android Instant App Codelabs

13. Step 2
Creating the instant app APK
FROM Google Android Instant App Codelabs

14. Step 3
Creating a Multi-Feature Instant App
FROM Google Android Instant App Codelabs

15. Trim the fat
✘ Base + Feature < 4MB
FROM Android Instant Apps, step-by-step: how Vimeo went about it

16. Trim the fat
✘ Remove PNGs
FROM Make Your App Instant

17. How do I refactor
✘ Quick and dirty approach
✗Create a new codebase
✗Trim down to 4MB
✗Apply AIA UX best practices
FROM Android Instant Apps, step-by-step: how Vimeo went about it

18. How do I refactor
✘ The right approach
✗Get an idea of your larger dependencies
✗Remove, replace, or abstract the dependencies you can
✗Rely heavily on composition and dependency injection
FROM Android Instant Apps, step-by-step: how Vimeo went about it

19. Unsupported features
✘ Long-running background services
✘ Manifest-registered broadcast receivers
✘ Externally accessible content providers
✘ Re-engagement notifications
✘ Content providers
FROM Android Instant Apps | Android Developers

20. References
✘Google documents
✗Android Instant App
✗AIA best practices
✘Google IO ’17 videos on Youtube
✗Introduction to Android Instant Apps
✗Building an Android Instant App
✗Android Instant Apps Best Practices Fireside Chat
✘Others
✗Android Instant Apps, step-by-step: how Vimeo went
about it
✗Make Your App Instant

21. THANKS!
Any questions?
You can find me at
✘ Benjamin Cheng
chengwc@gmail.com