Java 文件有一个带有 J 的红色圆圈（android studio）
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Java files have a red circle with J in it (android studio)
提问by proselyte6
I downloaded a project from GitHub, in which me and a friend are working on. Everything was working fine and all of a sudden a red circle with a "J" in it was on the Java files' icons and the run app button become grayed out. Please help me!
我从 GitHub 下载了一个项目，我和一个朋友正在这个项目中工作。一切正常，突然间，Java 文件的图标上出现一个带有“J”的红色圆圈，运行应用程序按钮变灰。请帮我！
回答by thodorisbais
I hope you have already found a workaround, but if not/for future reference:
I assume we 're talking about this icon: 
.
If thisanswer (or thispost) don't seem to be a solution for you, then you should probably go for Configuring Content Roots(docs based on IntelliJ, but thisanswer should conform the docs to Android-Studio).
我希望您已经找到了解决方法，但如果没有/为了将来参考：
我假设我们正在谈论这个图标：。
如果这个答案（或这篇文章）似乎不是你的解决方案，那么你可能应该去配置内容根（基于 IntelliJ 的文档，但这个答案应该使文档符合 Android-Studio）。
