Gradle – Create a Jar file

build.gradle

android.libraryVariants.all { variant ->
  String taskName = "makeJar${variant.name.capitalize()}"

  task(taskName, type: Copy) {
    String baseFileName = "${project.name}-${variant.name}"
    String outputDir = "${buildDir.getPath()}/outputs"

    dependsOn "assemble${variant.name.capitalize()}"
    from(zipTree("${outputDir}/aar/${baseFileName}.aar"))
    into("${outputDir}/jar/")
    include('classes.jar')
    rename('classes.jar', "${baseFileName}-${variant.mergedFlavor.versionName}.jar")
  }

  makeJar.dependsOn tasks[taskName]
}

task(makeJar) << {
  // Empty. We'll add dependencies for this task below
}