Introduction of new in Kotlin for Android

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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   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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