articles_gradle_5.kt

// BluesquarePlugin.kt
open class BluesquarePlugin : Plugin<Project> {
    override fun apply(project: Project) {
              project.configureAndroid()
    }
}

// Android.kt
internal fun Project.configureAndroid() = this.extensions.getByType<AndroidBaseExtension>().run {
        compileSdkVersion(28)
        defaultConfig {
            minSdkVersion(21)
            targetSdkVersion(28)
            versionCode = 2
            versionName = "1.0.1"
            testInstrumentationRunner = "android.support.test.runner.AndroidJUnitRunner"
        }

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

            getByName("debug") {
                isTestCoverageEnabled = true
            }
        }

        packagingOptions {
            exclude("META-INF/NOTICE.txt")
          // ...
        }

        compileOptions {
            sourceCompatibility = JavaVersion.VERSION_1_8
            targetCompatibility = JavaVersion.VERSION_1_8
        }
}