【Android Studio】Frameworks detected: Android framework is detected in the project Configure

刚开始在 Mac 上用 Android Studio, 打开第一个项目就遇到了问题，描述如下：

上午9:: Frameworks detected: Android framework is detected in the project Configure
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/names.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/records.dat.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/names.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/records.dat.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./index/bytecodeanalysis/bytecodeAnalysis.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/names.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/names.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:: FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1./caches/contentHashes.dat.keystream.len (No such file or directory)

如下图所示：

原因：jdk 没有配置环境变量。

解决方法：Mac jdk 环境变量配置