Copying APK file in Android Gradle project

publish.gradle

def releasePath = file("${rootDir}/archive/${project.name}")

def releaseTask = tasks.create(name: 'release') {
    group 'Build'
    description "Assembles and archives all Release builds"
}

android.applicationVariants.all { variant ->
    if (variant.buildType.name == 'release') {
        def build = variant.name.capitalize()

        def releaseBuildTask = tasks.create(name: "release${build}", type: Zip) {
            group 'Build'
            description "Assembles and archives apk and its proguard mapping for the $build build"
            destinationDir releasePath
            baseName variant.packageName
            if (!variant.buildType.packageNameSuffix) {
                appendix variant.buildType.name
            }
            if (variant.versionName) {
                version "${variant.versionName}_${variant.versionCode}"
            } else {
                version "$variant.versionCode"
            }
            def archiveBaseName = archiveName.replaceFirst(/\.${extension}$/, '')
            from(variant.outputFile.path) {
                rename '.*', "${archiveBaseName}.apk"
            }
            if (variant.buildType.runProguard) {
                from(variant.processResources.proguardOutputFile.parent) {
                    include 'mapping.txt'
                    rename '(.*)', "${archiveBaseName}-proguard_\$1"
                }
            }
        }
        releaseBuildTask.dependsOn variant.assemble

        variant.productFlavors.each { flavor ->
            def flavorName = flavor.name.capitalize()
            def releaseFlavorTaskName = "release${flavorName}"
            def releaseFlavorTask
            if (tasks.findByName(releaseFlavorTaskName)) {
                releaseFlavorTask = tasks[releaseFlavorTaskName]
            } else {
                releaseFlavorTask = tasks.create(name: releaseFlavorTaskName) {
                    group 'Build'
                    description "Assembles and archives all Release builds for flavor $flavorName"
                }
                releaseTask.dependsOn releaseFlavorTask
            }
            releaseFlavorTask.dependsOn releaseBuildTask
        }
    }
}

/*It creates tasks like the following:

release - Assembles and archives all Release builds
releaseFree - Assembles and archives all Release builds for flavor Free
releaseFreeRelease - Assembles and archives apk and its proguard mapping for the FreeRelease build
releasePaid - Assembles and archives all Release builds for flavor Paid
releasePaidRelease - Assembles and archives apk and its proguard mapping for the PaidRelease build
Content of archive/projectName/packageName-buildType-versionName_versionCode.zip would be:

packageName-buildType-versionName_versionCode.apk
packageName-buildType-versionName_versionCode-proguard_mapping.txt*/

publish2.gradle

def publish = project.tasks.create("publishAll")
android.applicationVariants.all { variant ->
  def task = project.tasks.create("publish${variant.name}Apk", Copy)
  task.from(variant.outputFile)
  task.into(buildDir)

  task.dependsOn variant.assemble
  publish.dependsOn task
}

/*Now you can call gradle publishAll and it'll publish all you variants.

One issue with the mapping file is that the Proguard task doesn't give you a getter to the file location, so you cannot currently query it. I'm hoping to get this fixed.*/

http://stackoverflow.com/questions/21434554/copying-apk-file-in-android-gradle-project