Introduction of new in Kotlin for Android

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Copyright (C) 2020 Yahoo Japan Corporation. All Rights Reserved. 情報区分 ※スライドマスターで編集してください ©2023 Yahoo Japan Corporation All rights reserved. Introduction of new in Kotlin for Android Yahoo Japan Corporation Yuma Kanno

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©2023 Yahoo Japan Corporation All rights reserved. • Kotlin is an oﬃcially supported language on Android (2017) • Android development is Kotlin-ﬁrst (2019) Kotlin in Android 3 https://android-developers.googleblog.com/2022/08/celebrating-5-years-of-kotlin-on-android.html $FMFCSBUJOHZFBSTPG,PUMJOPO"OESPJE

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©2023 Yahoo Japan Corporation All rights reserved. • Kotlin 2.0 integration in Android Studio (2024 ~) The Kotlin 2.0 compiler 4 Project Kotlin 1.8 compiler Kotlin 2.0 compiler Improvement Kotlin 5m 40s 2m 37s ~2.2x IntelliJ IDEA Ultimate 34m 15s 16m 59s ~2.0x Compiler performance Whatʼs new in Kotlin for Android: https://io.google/2023/program/a3250bf1-dab1-4752-82bb-4412afb94d66/intl/ja/

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©2023 Yahoo Japan Corporation All rights reserved. Announce that the default language for build scripts has been switch to Kotlin!! Kotlin is the single default language used for all project code Switch the default language 8 ,PUMJO%4-JT/PXUIF%FGBVMUGPS/FX(SBEMF#VJMET IUUQTBOESPJEEFWFMPQFSTHPPHMFCMPHDPNLPUMJOETMJTOPXEFGBVMUGPSOFXHSBEMFCVJMETIUNM

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©2023 Yahoo Japan Corporation All rights reserved. 1. Compile-time checking 2. Better IDE experience 3. Simpliﬁed, declarative plugin syntax 4. A growing community of Kotlin developers Benefits of choosing the Kotlin DLS over Groovy DSL 9

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©2023 Yahoo Japan Corporation All rights reserved. • Groovy is a dynamic language while Kotlin is a statically typed • Build script errors might occur at compile time rather than at runtime • With dynamic type checking, errors are not detected until the build script is executed • Working in an IDE, an editor can highlight the errors Compile-time checking 10

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©2023 Yahoo Japan Corporation All rights reserved. • When you apply Gradle plugins to a project, you need to specify only the plugin ID • If you try to apply a plugin that doesnʼt exist, the IDE will show you a syntax error Simplified, declarative plugin syntax 12 (SPPWZ%4- ,PUMJO%4-

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©2023 Yahoo Japan Corporation All rights reserved. • Manage dependencies in one central location and share dependencies across modules or projects • While using Version Catalogs is optional, they pair great with the Kotlin DSL by providing ore type safety in your build deﬁnitions Gradle Version Catalogs 15

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©2023 Yahoo Japan Corporation All rights reserved. kapt (Kotlin Annotation Processing Tool) KSP (Kotlin Symbol Processing) KSP 17 Kotlin code Java stubs Java Annotation Processors Kotlin code Java Annotation Processors Whatʼs new in Kotlin for Android: https://io.google/2023/program/a3250bf1-dab1-4752-82bb-4412afb94d66/intl/ja/

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©2023 Yahoo Japan Corporation All rights reserved. • Kotlin 2.0 compiler • Switch the default language for build scripts to Kotlin • Benefits of choosing the Kotlin DSL over Groovy DSL • Gradle Version Catalogs • KSP Summary 19