Hot Reload on Android with Compose HotSwan

Hot Reload on Android with Compose HotSwan

Transcript

1. Hot Reload on Android With Compose HotSwan Senior Developer Advocate @ RevenueCat Jaewoong Eum skydoves @github_skydoves
2. github/skydoves
3. What is Hot Reload? 3 Hot reload is the ability to see your code changes reflected on a running device instantly, without rebuilding, reinstalling, restarting, and navigating to the specific screens in the app. Without Hot Reload With Hot Reload
4. Why Hot Reload? 4 • Fast development feedback (literal changes, resource (strings.xml, etc) changes) • Tuning UI animations • Watching UI changes on a real device, not a virtual JVM environment
5. Why makes difficult on Android 5 • Dart Virtual Machine • Reloads Dart code into VM • Designed to keep app state • Mostly framework-controlled • Android Runtime • Limited class/method replacement • Harder across compiled app layers • Bytecode, class loading, verification, optimizations • JavaScript engine • Replaces JS bundle/modules • JS state can often stay alive • Native bridge boundaries
6. Compose HotSwan 6 Compose HotSwan No rebuild No reinstall No restart
7. 7 Live Demo hotswan.dev
8. Limitations 8 • Structural changes (changing a huge amount of composable trees) • Breaking baselines of the top-level classes (removing existing classes/functions) • Data class property changes • Constructor changes • Interface and superclass changes • etc. But the biggest problem is.. nobody tweaks even little parts of the code in this AI era.
9. Compose HotSwan v2 9 Compose HotSwan V2 interpreter engine No rebuild No reinstall No restart
10. 10 Live Demo hotswan.dev
11. What's the future? 11 The key trade-offs • The interpreter engine must handle all Compose APIs and third-party packages. • Runtime API interpretation takes longer than v1. • The delay is a reasonable trade-off, as it is still faster than a full rebuild. • The mission is for developers to watch AI code changes in real-time. • Fast the development feedback and improve the Android Android development paradigms following the AI era. The mission
12. Thank you! @skydoves skydoves2@gmail.com @github_skydoves