build.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 27
    buildToolsVersion '27.0.3'

    defaultConfig {
        minSdkVersion 14
        targetSdkVersion 27
    }

    sourceSets {
        main {
            manifest {
                srcFile 'AndroidManifest.xml'
            }
            java {
                srcDir 'src'
            }
            res {
                srcDir 'res'
            }
            assets {
                srcDir 'assets'
            }
            resources {
                srcDir 'src'
            }
        }
    }
}

android.libraryVariants.all  { variant ->
    def name = variant.buildType.name
    if (!name.equals('debug')) {
        def task = project.tasks.create  "jar${name.capitalize()}", Jar
        task.dependsOn variant.javaCompile
        task.from  variant.javaCompile.destinationDir
        artifacts.add('archives', task);
    }
}

dependencies {
}

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task javadoc(type: Javadoc) {
    source = android.sourceSets.main.java.srcDirs
    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
    destinationDir = file('javadoc/')
    failOnError false
}