generate android javadoc with gradle and publish javadoc site to Nexus OSS

build.gradle

import io.github.httpbuilderng.http.HttpTask
import groovyx.net.http.ApacheEncoders
import static groovyx.net.http.MultipartContent.multipart
import static groovy.io.FileType.FILES
plugins {
  id "io.github.http-builder-ng.http-plugin" version "0.1.1"
}

task javadoc(type: Javadoc) {
    source = android.sourceSets.main.java.sourceFiles
    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
    classpath += configurations.compile 
    project.android.libraryVariants.all { v ->
           classpath += v.javaCompile.classpath
    }
}
//provide Nexus creds with `gradle publishJavaDoc -Pusername=<username> -Ppassword=<password>
task publishJavaDoc(type: HttpTask, dependsOn: javadoc){
    config {
        request.uri = 'https://nexus.mycompany.com'
        request.encoder('multipart/form-data', ApacheEncoders.&multipart)
    }
    javadoc.destinationDir.eachFileRecurse(FILES) { file ->
      def relative = file.absolutePath - javadoc.destinationDir.absolutePath
        put {
            request.uri.path = '/repository/android-sdk-javadoc/' + relative
            request.auth.basic(project.getProperty('username'), project.getProperty('password'))
            request.body = file.text
            request.contentType = 'text/plain'
        }
    }
}