build.gradle

import com.android.build.gradle.api.BaseVariant

buildscript {
    ext.versions = [
        'kotlin': '1.2.21',
        'supportLibrary': '27.0.2',
        'atsl': '1.0.1',
    ]

    repositories {
        jcenter()
        google()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.0-beta1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${versions.kotlin}"
        classpath "org.jetbrains.dokka:dokka-android-gradle-plugin:0.9.15"
    }
}

group = 'androidx.core'
version = '0.2-SNAPSHOT'

apply plugin: 'com.android.library'
apply plugin: 'org.jetbrains.kotlin.android'
apply plugin: 'org.jetbrains.dokka-android'
apply plugin: 'maven'

repositories {
    jcenter()
    google()
}

android {
    compileSdkVersion 27

    defaultConfig {
        minSdkVersion 14

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    lintOptions {
        checkTestSources true
    }

    // TODO replace with https://issuetracker.google.com/issues/72050365 once released.
    libraryVariants.all {
        it.generateBuildConfig.enabled = false
    }
}

configurations {
    ktlint
    metalava
}

dependencies {
    api "org.jetbrains.kotlin:kotlin-stdlib:${versions.kotlin}"
    implementation "com.android.support:support-annotations:${versions.supportLibrary}"
    implementation "com.android.support:support-compat:${versions.supportLibrary}"

    androidTestImplementation 'junit:junit:4.12'
    androidTestImplementation "com.android.support:support-annotations:${versions.supportLibrary}"
    androidTestImplementation "com.android.support.test:runner:${versions.atsl}"
    androidTestImplementation "com.android.support.test:rules:${versions.atsl}"
    androidTestImplementation 'com.google.truth:truth:0.39'
    androidTestImplementation 'com.squareup.okio:okio:1.13.0'

    ktlint 'com.github.shyiko:ktlint:0.15.0'

    // Metalava isn't released yet. Check in its jar and explicitly track its transitive deps.
    metalava files('metalava.jar')
    metalava 'com.android.tools.external.org-jetbrains:uast:26.1.0-beta1'
    metalava 'com.android.tools.external.com-intellij:intellij-core:26.1.0-beta1'
    metalava 'com.android.tools.lint:lint-api:26.1.0-beta1'
    metalava 'com.android.tools.lint:lint-checks:26.1.0-beta1'
    metalava 'com.android.tools.lint:lint-gradle:26.1.0-beta1'
    metalava 'com.android.tools.lint:lint:26.1.0-beta1'
    metalava 'org.jetbrains.kotlin:kotlin-stdlib:1.2.21'
}

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
    kotlinOptions {
        freeCompilerArgs = ['-Xno-param-assertions']
    }
}

task ktlint(type: JavaExec, group: LifecycleBasePlugin.VERIFICATION_GROUP) {
    inputs.dir('src')
    outputs.dir('src')

    description = "Check Kotlin code style."
    classpath = configurations.ktlint
    main = 'com.github.shyiko.ktlint.Main'
    args '--android', 'src/**/*.kt'
}
check.dependsOn ktlint

task ktFormat(type: JavaExec, group: 'formatting') {
    inputs.dir('src')
    outputs.dir('src')

    description = 'Fix Kotlin code style deviations.'
    classpath = configurations.ktlint
    main = 'com.github.shyiko.ktlint.Main'
    args '--android', '-F', 'src/**/*.kt'
}


def variantClasspath(BaseVariant variant) {
    return (android.bootClasspath + variant.compileConfiguration.incoming.artifactView { config ->
        config.attributes { container ->
            container.attribute(Attribute.of("artifactType", String.class), "jar")
        }
    }.artifacts.artifacts.collect { it.file }).join(File.pathSeparator)
}
android.libraryVariants.all { variant ->
    // TODO eliminate variants https://issuetracker.google.com/issues/62201427
    if (variant.buildType.isDebuggable()) {
        return
    }

    task updateApi(type: JavaExec) {
        inputs.dir('src/main/java')
        outputs.file('api/current.txt')

        classpath = configurations.metalava
        main = 'com.android.tools.metalava.Driver'

        doFirst {
            args = [
                    '--no-banner',
                    '--source-path', 'src/main/java',
                    '--compatible-output=no',
                    '--omit-common-packages=yes',
                    '--output-kotlin-nulls=yes',
                    '--hide', 'HiddenSuperclass',
                    '--classpath', variantClasspath(variant),
                    '--api', 'api/current.txt'
            ]
        }
    }

    task checkApi(type: JavaExec) {
        inputs.file('api/current.txt')
        inputs.dir('src/main/java')
        outputs.file('api/current.txt')

        classpath = configurations.metalava
        main = 'com.android.tools.metalava.Driver'

        doFirst {
            args = [
                    '--no-banner',
                    '--source-path', 'src/main/java',
                    '--compatible-output=no',
                    '--omit-common-packages=yes',
                    '--output-kotlin-nulls=yes',
                    '--input-kotlin-nulls=yes',
                    '--hide', 'HiddenSuperclass',
                    '--classpath', variantClasspath(variant),
                    '--check-compatibility',
                    '--previous-api', 'api/current.txt'
            ]
        }
    }
    check.dependsOn checkApi
}

dokka {
    outputFormat = 'html'
    outputDirectory = "$buildDir/documentation"
}
task dokkaJar(type: Jar, dependsOn: dokka) {
    classifier = 'javadoc'
    from dokka.outputDirectory
}

task sourcesJar(type: Jar) {
    classifier = 'sources'
    from android.sourceSets.main.java.source
}

artifacts {
    archives dokkaJar
    archives sourcesJar
}

def googleRepo = "$buildDir/google-repo"
uploadArchives {
    repositories {
        mavenDeployer {
            repository(url: "file://$googleRepo")
            pom.project {
                name "Android KTX Core"
                description "A set of Kotlin extensions for Android app development."
                url "https://github.com/android/android-ktx"
                inceptionYear 2017

                licenses {
                    license {
                        name 'The Apache Software License, Version 2.0'
                        url 'http://www.apache.org/licenses/LICENSE-2.0.txt'
                        distribution 'repo'
                    }
                }

                developers {
                    developer {
                        name "The Android Open Source Project"
                    }
                }

                scm {
                    url "https://github.com/android/android-ktx"
                    connection "scm:git:git://github.com/android/android-ktx.git"
                }
            }
        }
    }
}

task deleteGoogleRepo(type: Delete) {
    delete googleRepo
}
uploadArchives.dependsOn(deleteGoogleRepo)

task googleZip(type: Zip, dependsOn: uploadArchives) {
    from googleRepo
}
assemble.dependsOn(googleZip)