How to specify android assembled library file name on gradle 5.1

Question

Gradle changed it's behavior when I updated from 5.0 to 5.1.

Lets assume that we have an android project with single module named library. On Gradle 5.0 (and previous versions) when I executed ./gradlew assembleRelease or ./gradlew assembleDebug generated output was library-release.aar or library-debug.aar respectively.

After I updated to Gradle 5.1 (I also tried 5.1.1) it generates only library.aar for any build type without any build-type classifier in output file name.

So my question is: how can I force Gradle 5.1 to set correct output file naming for different build types like it was before? Below is my library module's build.gradle.kts, but I doesn't think that there is something wrong with it:

import org.jetbrains.kotlin.config.KotlinCompilerVersion

plugins {
    id("com.android.library")
    id("kotlin-android")
    id("maven-publish")
}

val libraryVersion = "1.5.0"

android {
    compileSdkVersion(28)

    defaultConfig {
        minSdkVersion(16)
        targetSdkVersion(28)
        versionCode = 1
        versionName = libraryVersion
    }

    lintOptions {
        isAbortOnError = false
    }

    buildTypes {
        getByName("release") {
            isMinifyEnabled = false
            proguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
        }
    }
}

dependencies {
    implementation(fileTree(mapOf("include" to listOf("*.jar"), "dir" to "libs")))
    implementation(kotlin("stdlib-jdk7", KotlinCompilerVersion.VERSION))
}

---

UPDATE:

If I add a following code to build.gradle.kts:

afterEvaluate {
    android.libraryVariants.forEach { libraryVariant ->
        libraryVariant.outputs.forEach { output ->
            println(output.outputFile.name)
        }
    }
}

It will print:

library-debug.aar
library-release.aar

Now it starts looking like a bug in gradle 5.1

Answer 1

So as we can see in https://github.com/gradle/gradle/issues/8328, it is a bug which is fixed in Android Gradle Plugin 3.4.

Answer 2

libraryVariants.all { variant ->
    variant.outputs.all { output ->
        def filePrefix = "$buildDir/outputs/aar/$archivesBaseName"
        outputFileName = "${archivesBaseName}-${version}.aar"
        def fileSuffix = "aar"
        def originalFile = file("$filePrefix-${variant.buildType.name}.$fileSuffix")
        def renamedFile = "$filePrefix-${variant.buildType.name}-$version.$fileSuffix"
        tasks.named("assemble").configure {
            doLast {
                originalFile.renameTo(renamedFile)
            }
        }
    }
}

where archivesBaseName and version can defined in default block of libraries build.gradle