Luca Nicoletti
• Android Engineer ~7 years
• Jetpack Compose enthusiast
• Youtuber (ish)
• Into Multiplatform
• Not only KMP
👋
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How?
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Chat GPT
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Questions?
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The timeline
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The timeline
1 month development
03/05 27/05
First commit First release
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The timeline
Weeks before
03/05
The wall 🧱
Coding 💻* The switch 🔄
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The timeline
Months before
Coding 💻
08/03
The idea 💡
The planning 📝
The design 🎨
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The timeline
Diamong painting
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The timeline
Diamong painting
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The timeline
Years before
2024
Coding job The idea 💡
2013
May - Jun 2017
}
Flutter test*
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The app 📱
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The app 📱
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The app 📱
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The switch 🔄
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The switch 🔄
Facing a wall 🧱
• Slow rendering (with Jetpack Compose)
• Would need a second project for the Native iOS
• With 0-ish knowledge of the platform
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The switch 🔄
Why not React?
• Adversion through Js
• ReactNative uses native components
• Would the rendering problem occur again?
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The switch 🔄
Why not KMP?
• Love for Kotlin
• Compose Multiplatform
• Would face the same problem?
• LocalDB?
• Still too early?
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Tools
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Tools
What I used
• Visual Studio Code + Terminal
• Android Studio
• Mac OS
• iPhone
• Emulators
• Physical Android
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Tools
What I used
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The development
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The development
Libraries
• Navigation: `go_router`
• Persistence: `provider`
• Storage: `shared_preferences` & `sq
f
lite`
• Interactions:
• Sounds: `soundpool`
• Vibrations: `
f
lutter_vibrate`
• Upgrade dialog: `upgrader`
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The development
Libraries
• Others
• `
f
irebase_analytics`
• `
f
irebase_crashlytics`
• `
f
irebase_database`
• `cached_network_image`
• `
f
lutter_svg`
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The development
go_router
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The development
go_router
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The development
go_router
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The development
Provider
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The development
shared_preferences
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The development
shared_preferences
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The development
shared_preferences
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The development
sq
f
lite
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The development
sq
f
lite
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The development
sq
f
lite
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The development
Soundpool
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The development
Soundpool
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The development
f
lutter_vibrate
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The development
Upgrader
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The development
Upgrader
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The development
Libraries
• Image picker: `image_picker`
• Image cropper: `image_cropper`
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The development
image_picker
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The development
image_picker & image_cropper
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The development
image_cropper
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The development
image_cropper
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The development
image_cropper
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The development
image_cropper
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The development
Libraries
• UI
• Confetti: `confetti`
• Intro: `page_view_dot_indicator`, `carousel_slider`
• Intro: `rotated_corner_decoration`
• Capturing the Widget: `widgets_to_image`
• Sharing the result: `share_plus`
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The development
widgets_to_image & share_plus
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The development
widgets_to_image & share_plus
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The development
confetti
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The development
confetti
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The development
rotated_corner_decoration
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The development
rotated_corner_decoration
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The development
rotated_corner_decoration
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First feedbacks
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First feedbacks
What to improve
• The timer gives anxiety 😥
• Haptic feedback 📳
• Sound 🔊
• Multiple games at the same time ♟👾🕹🎲
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First feedbacks
What to improve
• Timer became collapsible
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First feedbacks
What to improve
• Multiple games at the same time ♟👾🕹🎲
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Release!
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Release
Now what?
Task iOS Android
Setup Developer account ❌ ✅
Pay the fees ❌ ✅
Generate release builds ❌ ✅
Beta release ✅ ❌
Promote the release ✅ ✅
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Release
Building them
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Release
Now what?
Task iOS Android
Setup Developer account 🟰 🟰
Pay the fees ❌ ✅
Generate release builds 🟰 🟰
Beta release ✅ ❌
Promote the release 🟰 🟰
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Problems
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Problems
What went wrong
• ChatGPT is ok, not good
• ZoomableWidget*
• Apps size!
• Users really notice that!
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Problems
ZoomableWidget
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Problems
ZoomableWidget
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Problems
ZoomableWidget
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Problems
ZoomableWidget
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Problems
ZoomableWidget
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Problems
Widget generation
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Problems
Widget generation
ChatGPT VSCode plugin
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Problems
Widget generation
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Problems
What I did wrong
• Simple approach (Provider 👀)
• Complexity kept adding
• No structure
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Problems
Provider
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Future
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Future
Would I use it again?
• Yes
• No
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Future
Would I use it again?
• Yes
• Framework knowledge
• Enjoyment of development
• Multi-platform
• Good support & libraries
• No
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Future
Would I use it again?
• Yes
• No
• App size
• Language lacks features
• Lacking knowledge (Architecture, best practices, etc…)