Introduction of new in Kotlin for Android

Google I/O 2023 で発表された Kotlin の新機能について紹介

Transcript

1. 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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2. ©2023 Yahoo Japan Corporation All rights reserved.
   Introduction
   2
   Yuma Kanno
   n Yahoo Japan Corporation (2020 ~)
   PayPay Flea Market App
   Android Engineer
   

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3. ©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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   • Kotlin 2.0 integration in Android Studio (2024 ~)
   The Kotlin 2.0 compiler
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   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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   The Kotlin 2.0 compiler
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   Try the Kotlin 2.0 compiler
   

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   Kotlin DSL
   6
   

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   Until now,
   the default language to build scripts was
   Groovy (build.gradle)
   Kotlin (build.gradle.kts) option also existed.
   7
   

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8. ©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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   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
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    • 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
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    • Auto-completion and content assistance
    • Source code navigation
    • Refactoring
    Better IDE experience
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    • 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
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    (SPPWZ%4- ,PUMJO%4-
    

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    • Documentation
    • Forums
    • Blogs
    • Threads on social media
    • Online educational courses
    A growing community of Kotlin developers
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    • Kotlin DSL is selected by default when creating a new project module
    Android Studio Giraffe
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    • 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
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    KSP
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    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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    KSP support
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    Library Supported
    Room ◯
    Moshi ◯
    Dagger ×
    Hilt ×
    Glide ◯
    

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19. ©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
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20. ©2023 Yahoo Japan Corporation All rights reserved.
    Thank you for listening
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