Gradle code generation

gistfile1.txt

task generateVClass << {
    android.applicationVariants.all { variant ->
        variant.outputs.each { output ->
            def sep = System.getProperty("file.separator")
            def rFileTemplate = "%s/generated/source/r/%s/%s/R.java".replace("/", sep)
            def rFile = new File(String.format(rFileTemplate, project.buildDir, output.dirName.replace("/", sep), variant.applicationId.replace(".", sep)))
            if (!rFile.exists()) {//clean, error or variant which is not currently building
                return
            }
            println("Parsing:" + rFile.absolutePath)
            //generate class content
            def vClassFile = new File(String.format("%s/src/main/java/com/vodafone/auto/V.java", getProjectDir().absolutePath).replace("/", sep))
            def vClassContent = /*tools.gradle*/generateStringHelpClass(project.projectDir.absolutePath, rFile)
            //update it only with content change, git sees file attributes about update
            if (!vClassFile.exists() || !(vClassContent.equals(vClassFile.text))) {
                vClassFile.delete()
                vClassFile.write(vClassContent)
            }
        }
    }
}

afterEvaluate {
    android.applicationVariants.all { variant ->
        variant.javaCompiler.dependsOn(generateVClass)
    }
}