如何在Kotlin DSL中设置gradle的其他属性? [英] How are gradle extra properties set in the Kotlin DSL?

问题描述

我试图通过常规方式组织构建文件，方法是将值保存在单独的文件中以供重用.但是我不了解在Kotlin DSL中执行相同操作的语法.

I'm trying to organize my build files as I would in groovy, by having values in a separate file to reuse. But I cannot understand the syntax to do the same thing in the kotlin DSL.

这是我在root build.gradle.kts中使用的内容:

Here's what I'm using in root build.gradle.kts:

applyFrom("config.gradle.kts")

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        val test = project.extra["minSdkVer"]
        classpath("com.android.tools.build:gradle:3.0.0-alpha4")
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.2-5")
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()
    }
}

这是被引用的config.gradle.kts中的内容:

and here's whats in the config.gradle.kts that is being referenced:

mapOf(
        Pair("minSdkVer", 22),
        Pair("targetSdkVer", 25),
        Pair("compiledSdkVer", 25),
        Pair("buildToolsVer", "26-rc4")
).entries.forEach {
    project.extra.set(it.key, it.value)
}

但是有一个错误:

无法通过额外的属性扩展获得属性'minSdkVer'，因为它 不存在

Cannot get property 'minSdkVer' on extra properties extension as it does not exist

推荐答案

正确的解决方法: Gradle严格在执行脚本其他任何操作之前从脚本中收集并应用buildscript { ... }块.因此，要使buildscript中的config.gradle.kts中的属性可用，您应将applyFrom("config.gradle.kts")移到buildscript { ... }块中:

A correct fix: Gradle collects and applies the buildscript { ... } blocks from your script strictly before executing anything else from it. So, to make your properties from config.gradle.kts available inside the buildscript, you should move applyFrom("config.gradle.kts") to your buildscript { ... } block:

buildscript {
    applyFrom("config.gradle.kts")

    /* ... */
}

---

另一个可能的错误是在另一个ExtensionAware范围内使用额外的属性作为extra["minSdkVer"]，例如本例中的任务:

---

Another possible mistake is using an extra property as extra["minSdkVer"] in a scope of another ExtensionAware, like a task in this example:

val myTask = task("printMinSdkVer") {
    doLast {
        println("Extra property value: ${extra["minSdkVer"]}")
    }
}

^{在这种情况下，extra.get(...)不是使用任务的project.extra，而是extra.}

^{In this case, extra.get(...) uses not the project.extra but the extra of the task.}

要解决此问题，请指定您使用该项目.直接使用:

To fix that, specify that you work with the project. Direct usage:

println(project.extra["minSdkVer"])

并授权.

val minSdkVer by project.extra

这篇关于如何在Kotlin DSL中设置gradle的其他属性?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！