gradle, custom build apk file name

build.gradle

applicationVariants.all { variant ->
    variant.outputs.each { output ->

        def apkName = ""        def formattedDate = new Date().format('MMdd')
        def revisionHash = ["sh", "-c", "cd ${project.rootDir} ; git rev-parse --short=10 HEAD"].execute().in.text.trim()

        def lastName = variant.versionName + "_" + formattedDate + "_"+revisionHash+".apk"
        if (variant.buildType.name == "release") {
            apkName = "Appname_" + lastName
        } else {
            apkName = "Appname_dev" + lastName
        }
        output.outputFile = new File(output.outputFile.parent, apkName)
    }
}