Android Gradle Javadoc Task

bintray.gradle

task javadoc(type: Javadoc, dependsOn: 'assembleRelease') {
    source = android.sourceSets.main.java.srcDirs
    classpath += configurations.compile
    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
    android.libraryVariants.all { variant ->
        if (variant.name == 'release') {
            owner.classpath += variant.javaCompile.classpath
        }
    }
}