build.gradle.kts

build.gradleをKotlinに書き換えた話
チラッと導入仕方と罠を紹介します

Transcript

1. build.gradle.kts KotlinConf 2018 報告会
2. About Me • Matthew Vern / Panini • Twitter: @callipan Github: panpanini • Mercari, Inc • Android Engineer (US) • Kotlin可愛い
3. Summary • build.gradle → build.gradle.kts に書き換えた結果 ◦ autocompleteなどを使える ◦ 書き換えるところでちょっと苦労する • 99% 問題なくうごく
4. kotlin-dsl
5. kotlin-dsl • build.gradleをKotlinで書けるplugin ◦ https://github.com/gradle/kotlin-dsl ◦ https://blog.gradle.org/kotlin-meets-gradle
6. How to • No auto-convert • Almost the same as Groovy, so can copy-paste, or write by hand
7. tips
8. Tips • buildSrc/src/main/java ◦ 普通のkotlinファイルおける → compileTaskでコンパイルされる ◦ Build.gradle.ktsで使える • Dependency managementに良い
9. buildSrc/Credentials.kt object Credentials { val hogeUsername = System.getProperty("hoge_username") val hogePassword = System.getProperty("hoge_password") }
10. buildSrc/Dependencies.kt object Versions { val supportLibrary = "27.1.0" ... } object Dependencies { // support val supportV4 = "com.android.support:support-v4:${Versions.supportLibrary}" }
11. buildSrc/Dependencies.kt object Dependencies { ... } object DebugDependencies { ... } object ReleaseDependencies { ... }
12. buildSrc/Dependencies.kt object Plugins { val unusedResourceRemover = "com.github.konifar.gradle.unused-resources-remover" }
13. app/build.gradle.kts plugins { id(Plugins.unusedResourceRemover) } repositories { maven("https://hoge.com/gradle/gradle-release/") { credentials.username = Credentials.hogeUsername credentials.password = Credentials.hogePassword } } dependencies { implementation(Dependencies.supportV4) releaseImplementation(ReleaseDependencies.hoge) }
14. pain points
15. app/build.gradle buildScript { dependencies { classpath(BuildScriptDependencies.removeResourcesPlugin) } } plugins { id(Plugins.unusedResourceRemover) }
16. app/build.gradle FAILURE: Build failed with an exception. * Where: Build file '/app/build.gradle.kts' line: 4 * What went wrong: Script compilation error: Line 4: classpath(BuildScriptDependencies.removeResourcesPlugin) ^ Unresolved reference. None of the following candidates is applicable because of receiver type mismatch: public final fun DependencyHandler.classpath(dependencyNotation: Any): Dependency? defined in org.gradle.kotlin.dsl.ScriptHandlerScope
17. app/build.gradle buildScript { dependencies { classpath(BuildScriptDependencies.removeResourcesPlugin) } } plugins { id(Plugins.unusedResourceRemover) }
18. app/build.gradle buildScript { dependencies { classpath(BuildScriptDependencies.removeResourcesPlugin) } } plugins { id(Plugins.unusedResourceRemover) }
19. app/build.gradle • Gradle: buildscript { } → 追加 • Kotlin: buildscript { } → 上書き
20. app/build.gradle • Gradle: buildscript { } → 追加 • Kotlin: buildscript { } → 上書き ↳　buildscriptはroot/build.gradle.ktsで書く
21. app/build.gradle • Gradle: buildscript { } → 追加 • Kotlin: buildscript { } → 上書き ↳　buildscriptはroot/build.gradle.ktsで書く 本当にこれでいいのか分からないので 他にいいアイデアあれば是非聞かせて ください！
22. app/build.gradle buildscript { classpath(BuildScriptDependencies.fabricPlugin) } plugins { id(Plugins.androidApplication) id(Plugins.fabric) ... }
23. app/build.gradle FAILURE: Build failed with an exception. IllegalStateException: 'android' or 'android-library' plugin required.
24. app/build.gradle FAILURE: Build failed with an exception. IllegalStateException: 'android' or 'android-library' plugin required. plugins { } を使うと同時にapplyされるっぽい
25. app/build.gradle FAILURE: Build failed with an exception. IllegalStateException: 'android' or 'android-library' plugin required. plugins { } を使うと同時にapplyされるっぽい この問題gradle-4.10.2で 治ってるっぽい！
26. まとめ
27. まとめ • build.gradleはKotlinで書こう！ • 動くよ！ • そんなに罠がないよ！
28. Have a nice Kotlin!