Created a new module Android library

Hello, when Android Studio removed support for the old fashioned template files, we starting using plugins to support the "New Module" templates that used to work. The idea is that users can right click on an app, select "Other->Custom Module" and then a new Android module would appear with customized build.gradle files.  

Here's what I'm trying.  The error is Can't support Java Module and Gradle Module in one project.  How do I make an Android Module?

fun RecipeExecutor.customModuleSetup(
        moduleData: ModuleTemplateData,
        packageName: String,
        entityName: String,
        moduleName: String,
) {
    val (projectData) = moduleData
    val project = projectInstance ?: return
    addAllKotlinDependencies(moduleData)

    val file = try {
        WriteCommandAction.writeCommandAction(project).compute(ThrowableComputable<ContentEntry, RuntimeException> {
            var f: VirtualFile = createProjectSubFile(ModuleRootManager.getInstance(ModuleManager.getInstance(project).modules[0]).contentRoots[0].path, "$moduleName/$moduleName.iml")
            val module = ModuleManager.getInstance(project).newModule(f.path, ModuleTypeId.JAVA_MODULE)
            PsiTestUtil.addContentRoot(module, f.parent)
})
} catch (e: IOException) {
throw RuntimeException(e)
}

if (file != null) {
gradleFile(moduleName).save(PsiManager.getInstance(project).findDirectory(file.file!!)!!, "", "build.gradle")
}
}

@Throws(IOException::class)
fun createProjectSubFile(projectPath: String?, relativePath: String?): VirtualFile {
val f = File(projectPath, relativePath)
FileUtil.ensureExists(f.getParentFile())
FileUtil.ensureCanCreateFile(f)
val created: Boolean = f.createNewFile()
if (!created && !f.exists()) {
throw AssertionError("Unable to create the project sub file: " + f.getAbsolutePath())
}
return LocalFileSystem.getInstance().refreshAndFindFileByIoFile(f)!!
}


fun String.save(srcDir: PsiDirectory, subDirPath: String, fileName: String) {
try {
val destDir = subDirPath.split(".").toDir(srcDir)
val psiFile = PsiFileFactory
.getInstance(srcDir.project)
.createFileFromText(fileName, KotlinLanguage.INSTANCE, this)
destDir.add(psiFile)
}catch (exc: Exception) {
exc.printStackTrace()
}
}