问题
When you create an IntelliJ 13 plugin project you can't also choose to make it a Gradle project. How do you start a plugin development project that is backed by Gradle?
回答1:
The current version of IntelliJ, 13.1.2, only supports Gradle-integration up to version 1.10. Configure this version of Gradle as your project's gradle home.
Now start by creating a build.gradle file in your project root.
If you try to run the gradle build in IntelliJ now you will get the message: "Error running build: Module 'your-plugin' is not backed by gradle". Close and reopen your project.
You will now have the option to import your project.
Viola!
来源：https://stackoverflow.com/questions/23458572/how-to-enable-gradle-in-an-intellij-plugin-project