build.gradle

/*
 * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

repositories {
    google()
}

configurations {
    r8
}

dependencies {
    compileOnly "com.google.android:android:$android_version"
    compileOnly "com.android.support:support-annotations:$android_support_version"

    testImplementation "com.google.android:android:$android_version"
    testImplementation "org.robolectric:robolectric:$robolectric_version"
    testImplementation "org.smali:baksmali:$baksmali_version"

    r8 'com.android.tools.build:builder:4.0.0-alpha06' // Contains r8-2.0.4-dev
}

class RunR8Task extends JavaExec {

    @OutputDirectory
    File outputDex

    @InputFile
    File inputConfig

    @InputFile
    final File inputConfigCommon = new File('testdata/r8-test-common.pro')

    @InputFiles
    final File jarFile = project.jar.archivePath

    @Override
    Task configure(Closure closure) {
        super.configure(closure)
        classpath = project.configurations.r8
        main = 'com.android.tools.r8.R8'
        return this
    }

    @Override
    void exec() {
        // Resolve classpath only during execution
        def arguments = [
                '--release',
                '--no-desugaring',
                '--output', outputDex.absolutePath,
                '--pg-conf', inputConfig.absolutePath
        ]
        arguments.addAll(project.configurations.runtimeClasspath.files.collect { it.absolutePath })
        arguments.addAll(jarFile.absolutePath)

        args = arguments

        if (outputDex.exists()) {
            outputDex.deleteDir()
        }
        outputDex.mkdirs()

        super.exec()
    }
}

def optimizedDexDir = new File(buildDir, "dex-optim/")
def unOptimizedDexDir = new File(buildDir, "dex-unoptim/")

def optimizedDexFile = new File(optimizedDexDir, "classes.dex")
def unOptimizedDexFile = new File(unOptimizedDexDir, "classes.dex")

task runR8(type: RunR8Task, dependsOn: 'jar'){
    outputDex = optimizedDexDir
    inputConfig = file('testdata/r8-test-rules.pro')
}

task runR8NoOptim(type: RunR8Task, dependsOn: 'jar') {
    outputDex = unOptimizedDexDir
    inputConfig = file('testdata/r8-test-rules-no-optim.pro')
}

test {
    // Ensure the R8-processed dex is built and supply its path as a property to the test.
    dependsOn(runR8)
    dependsOn(runR8NoOptim)

    inputs.files(optimizedDexFile, unOptimizedDexFile)

    systemProperty 'dexPath', optimizedDexFile.absolutePath
    systemProperty 'noOptimDexPath', unOptimizedDexFile.absolutePath

    // Output custom metric with the size of the optimized dex
    doLast {
        println("##teamcity[buildStatisticValue key='optimizedDexSize' value='${optimizedDexFile.length()}']")
    }
}

tasks.withType(dokka.getClass()) {
    externalDocumentationLink {
        url = new URL("https://developer.android.com/reference/")
        packageListUrl = projectDir.toPath().resolve("package.list").toUri().toURL()
    }
}