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build.gradle.kts
KotlinConf 2018 報告会
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About Me
● Matthew Vern / Panini
● Twitter: @callipan Github: panpanini
● Mercari, Inc
● Android Engineer (US)
● Kotlin可愛い
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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
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kotlin-dsl
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kotlin-dsl
● build.gradleをKotlinで書けるplugin
○ https://github.com/gradle/kotlin-dsl
○ https://blog.gradle.org/kotlin-meets-gradle
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How to
● No auto-convert
● Almost the same as Groovy, so can copy-paste, or write by hand
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tips
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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
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buildSrc/Credentials.kt
object Credentials {
val hogeUsername = System.getProperty("hoge_username")
val hogePassword = System.getProperty("hoge_password")
}
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buildSrc/Dependencies.kt
object Versions {
val supportLibrary = "27.1.0"
...
}
object Dependencies {
// support
val supportV4 = "com.android.support:support-v4:${Versions.supportLibrary}"
}
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buildSrc/Dependencies.kt
object Dependencies {
...
}
object DebugDependencies {
...
}
object ReleaseDependencies {
...
}
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buildSrc/Dependencies.kt
object Plugins {
val unusedResourceRemover = "com.github.konifar.gradle.unused-resources-remover"
}
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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)
}
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pain points
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app/build.gradle
buildScript {
dependencies {
classpath(BuildScriptDependencies.removeResourcesPlugin)
}
}
plugins {
id(Plugins.unusedResourceRemover)
}
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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
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app/build.gradle
buildScript {
dependencies {
classpath(BuildScriptDependencies.removeResourcesPlugin)
}
}
plugins {
id(Plugins.unusedResourceRemover)
}
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app/build.gradle
buildScript {
dependencies {
classpath(BuildScriptDependencies.removeResourcesPlugin)
}
}
plugins {
id(Plugins.unusedResourceRemover)
}
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app/build.gradle
● Gradle: buildscript { } → 追加
● Kotlin: buildscript { } → 上書き
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app/build.gradle
● Gradle: buildscript { } → 追加
● Kotlin: buildscript { } → 上書き
↳ buildscriptはroot/build.gradle.ktsで書く
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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！
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app/build.gradle
buildscript {
classpath(BuildScriptDependencies.fabricPlugin)
}
plugins {
id(Plugins.androidApplication)
id(Plugins.fabric)
...
}
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app/build.gradle
FAILURE: Build failed with an exception.
IllegalStateException: 'android' or 'android-library' plugin required.
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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
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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！
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まとめ
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まとめ
● build.gradleはKotlinで書こう！
● 動くよ！
● そんなに罠がないよ！
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Have a nice Kotlin!