Using the Android Library plugin for Gradle - create a .jar file (in addition to a .aar library file) that contains all the classes (and dependent jar files). Solution is based off a combination of solutions from https://gist.github.com/Lien/7150489 and the Winning answer to this Stackoverflow Question http://stackoverflow.com/questions/19307341…

Gradle Android Jar Library

android.libraryVariants.all { variant ->
  def name = variant.buildType.name
  if (name.equals(com.android.builder.BuilderConstants.DEBUG)) {
    return; // Skip debug builds.
  }
  def task = project.tasks.create "jar${name.capitalize()}", Jar
  task.dependsOn variant.javaCompile
  //Include Java classes
  task.from variant.javaCompile.destinationDir
  //Include dependent jars with some exceptions
  task.from configurations.compile.findAll {
            it.getName() != 'android.jar' && !it.getName().startsWith('junit') && !it.getName().startsWith('hamcrest')
        }.collect {
            it.isDirectory() ? it : zipTree(it)
        }
  artifacts.add('archives', task);
}

I want to delete AndroidX from big jar, how can i do?

android.libraryVariants.all { variant ->
        def name = variant.buildType.name
//        println "CONFIGURATIONS: " + name
        if (name == 'debug') {
//            println 'Skiping debug builds.'
            return
        }
        def task = project.tasks.create "lib${name.capitalize()}", Jar
        task.dependsOn variant.javaCompiler

        //Include Java classes
        task.from variant.javaCompiler.destinationDir

        //Include dependent jars with some exceptions
//        variant.getCompileConfiguration().files.each { println it.absolutePath }
        task.from variant.getCompileConfiguration().files.findAll() {
            it.absolutePath.startsWith(rootProject.projectDir.absolutePath) &&
            it.getName() != 'junit:4.12' &&
            it.getName() != 'appcompat:1.1.0' &&
            it.getName() != 'espresso-core:3.2.0'
//            !it.getName().startsWith('runner:1.2.0')
        }.collect {
            it.isDirectory() ? it : zipTree(it)
        }
        artifacts.add('archives', task)