Kotlin Multiplatform - Speaker Deck

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Kotlin Multiplatform

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@allymcleangames

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Hello

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• Kevin Galligan, President of Touchlab • I’ve been coding Android since before the G1, run a mobile dev shop, and since late 2015 have been largely focused on mobile code sharing • I’m going to tell you about Kotlin Multiplatform

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Kotlin?

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• Static “Better Java” by Jetbrains • 2011 - Announced • 2016 - v1.0 • 2017 - Google++

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JVM JS Native

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JVM JS Native Common

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Native

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Native Not Native

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Native Not Native - Me(h)tal Not Native - Rock

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–Lemmy Kilmister “It’s Little Richard’s fault, all of it. Little Richard is directly responsible for Motorhead.”

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• Shared, testable architecture (not UI) • Smooth interop, optional code sharing • Active community • Good tools • Bonus! One platform 100% native K O T L I N M U L T I P L A T F O R M

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I Can’t See The Future

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safe bets

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JVM JS Native Common

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JVM JS Native Common

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JVM Native Common

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JVM Native Common Android Stuff Framework iOS Stuff

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Common

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Common mainThread?

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Typealias

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Expected a method, was actually there!

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Status

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Kotlin/Native at .9

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Tooling

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Speed

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Libraries

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• 5 React Native • 3 Flutter • 4 Kotlin Multiplatform • ~20% of the content! Cross Platform Droidcon

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• Serialization • Ktor • I/O • Coroutines Jetbrains

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Threads

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State

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all the code you’ve ever written not frozen frozen

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all the code you’ve ever written not frozen frozen

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Frozen is • A special runtime state • Like super-immutable • Only way to share data between threads

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Data OtherMutable OtherShared Stuff MoreStuff

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Data OtherMutable OtherShared Stuff MoreStuff

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It works!

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9 Coroutines (and other libs)

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9 Coroutines (and other libs)

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9 Coroutines (and other libs)

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9 Coroutines (and other libs) v1

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9 Coroutines (and other libs) v1 Major reactive lib Date/other libs Improved tooling Faster builds

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9 Coroutines (and other libs) v1 Major reactive lib Date/other libs Improved tooling Faster builds “Mainstream” Big apps Wasm threads

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2010 ORMLite ActiveAndroid

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2010 ORMLite ActiveAndroid :P

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2010 ORMLite ActiveAndroid :P 2018 ORMLite SQLBright SQLDelight Storeio Room Cupboard SugarORM GreenDAO DBFlow Squeeky Ollie Requery Squidb