如何在Gradle Java库项目构建脚本中指定buildConfigField

问题描述：

在我的Android项目中，我可以指定Gradle常量，如下所示:

Within my Android projects I can specify Gradle constants as follows:

buildConfigField 'Boolean', 'analyticsEnabled', 'false'

并在我的Android应用程序中访问它们，如下所示:-

and access them in my Android application like this:-

public boolean isAnalyticsEnabled() {
        return BuildConfig.analyticsEnabled;
}

如何在Java库Gradle构建脚本中获得相同的功能?

How can I get the same functionality within a Java library Gradle build script?

更准确地说，我正在将自定义注释处理器开发为我的Android应用程序所依赖的纯Java项目(库).

To be more precise, I am developing a custom annotation processor as a pure Java project (library) that my Android application is dependant on.

我想在Java Gradle构建文件中定义可由注释处理器访问的常量.

I would like to define constants within my Java Gradle build file that are accessible by my annotation processor.

如果可能的话，我该如何实现?

If this is possible, then how to I achieve it?

答

您可以使用这些插件.例如. de.fuerstenau.buildconfig :

You can use one of these plugins. E.g. de.fuerstenau.buildconfig:

build.gradle :

plugins {
    id 'de.fuerstenau.buildconfig' version '1.1.8'
}

buildConfig {
    buildConfigField 'String', 'QUESTION', '"Life, The Universe, and Everything"'
    buildConfigField 'int', 'ANSWER', '42'
}

然后获得一个BuildConfig类，例如:

And then get a BuildConfig class like:

public final class BuildConfig
{
    private BuildConfig () { /*. no instance */ }

    public static final String VERSION = "unspecified";
    public static final String NAME = "DemoProject";

    public static final String QUESTION = "Life, The Universe, and Everything";
    public static final int ANSWER = 42;
}

如果您正在使用Kotlin并想生成Kotlin版本BuildConfig，请查看 io.pixeloutlaw.gradle.buildconfigkt .

If you're using Kotlin and want to generate a Kotlin version BuildConfig take a look at io.pixeloutlaw.gradle.buildconfigkt as well.

如果不喜欢这个主意，您可以做的是资源过滤:

If don't like that idea, what you can do is resource filtering:

build.gradle :

processResources {
    expand project.properties
}

gradle.properties (这些值与project.question和project.answer相同):

question=Life, The Universe, and Everything
answer=42

src/main/resources/buildconfig.properties :

question=${question}
answer=${answer}

然后只需在应用程序中将buildconfig.properties读入Properties并使用这些值即可.

Then just read buildconfig.properties into Properties in your app and use the values.

如何在Gradle Java库项目构建脚本中指定buildConfigField

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