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Inside the android Tag

applicationVariants.all { variant ->
        variant.outputs.all {
            def PROJECT_NAME = "male-app"
            def SEP = "_"
            def buildType
            if (variant.buildType.name == "release") {
                buildType = "production"
            } else {
                buildType = "test"
            }
            def version = "v" + variant.versionName
            def date = new Date()
            def formattedDate = date.format('yyyyMMdd')
            def newApkName = PROJECT_NAME + SEP + buildType + SEP + version + SEP + formattedDate + ".apk"
            outputFileName = newApkName
        }
    }