android - 无法在应用程式Gradle文件中参照BuildConfig-Android Studio

Question

我正在尝试基本的gradle功能。我正在尝试打印当前正在构建的产品 flavor 。我的gradle构建文件如下所示:

android {
    compileSdkVersion 27
    flavorDimensions "versionCode"
    defaultConfig {
        applicationId "com.test.test"
        minSdkVersion 21
        targetSdkVersion 27
        versionCode 34
        versionName "0.9.14.20180718"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        debug {
            debuggable false
            multiDexEnabled true
            minifyEnabled false
            shrinkResources false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            //proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
        release {
            debuggable false
            minifyEnabled true   //for optimization.
            shrinkResources true
            multiDexEnabled true

            logger.debug("Hello world.")
            logger.debug("Build flavor being used: " + BuildConfig.FLAVOR)

            //check for build flavour.
            /*if(BuildConfig.FLAVOR.contentEquals("managed")) {
                logger.debug("Managed flavour being used here.")
            } else if(BuildConfig.FLAVOR.contentEquals("debugFlavor")) {
                logger.debug("Debug flavor being used.")
            }*/

            //proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    productFlavors {
        managed {
            applicationId 'com.test.testing'
        }
        debugFlavor {
            applicationId 'com.test.testdebug
        }
    }
}

每当我尝试更改Gradle文件时，同步时都会出现以下错误:

Error:(30, 0) Could not get unknown property 'BuildConfig' for BuildType_Decorated{name=release, debuggable=false, testCoverageEnabled=false, jniDebuggable=false, pseudoLocalesEnabled=false, renderscriptDebuggable=false, renderscriptOptimLevel=3, minifyEnabled=true, zipAlignEnabled=true, signingConfig=null, embedMicroApp=true, mBuildConfigFields={}, mResValues={}, mProguardFiles=[], mConsumerProguardFiles=[], mManifestPlaceholders={}} of type com.android.build.gradle.internal.dsl.BuildType.
<a href="openFile:I:\work\workspace\test\app\build.gradle">Open File</a>

我不确定错误是什么。我检查了项目存储库中的BuildConfig.java文件，它们存在并且看起来还不错。

Answer 1

logger.debug("Build flavor being used: " + BuildConfig.FLAVOR)

I am not sure what the error is. I checked the BuildConfig.java file in the project repository and they exist and look just fine.

这行在技术上是错误的，BuildConfig.java是gradle构建工具生成的文件，此文件只能用于Java / Kotlin的我们的代码，而不能用于任何build.gradle gradle脚本文件。

在gradle脚本中，打印出构建 flavor 的正确方法如下:

project.afterEvaluate {
    android.productFlavors.all { flavor ->
        println "flavor.name: " + flavor.name
    }
}

如果要打印构建变体，可以按照以下步骤进行:

android.applicationVariants.all { variant ->
    println "variant.name: " + variant.name
}