Android studio Error :...you can't have non-Gradle Java modules and Android-Gradle modules ...

http://stackoverflow.com/questions/28668252/android-studio-error-unsupported-modules-detected-compilation-is-not-supported

解决办法:
1. File -> Invalidate Caches / Restart -> Invalidate Caches & Restart.
2. Try this if it helps File -> Invalidate Caches / Restart.
If it still doesn’t help click on the button in the image. ‘Sync Project with Gradle Files’

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