【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9:17:37 Frameworks detected: Android framework is detected in the project Configure
上午9:26:34 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/names.dat.keystream.len (No such file or directory)
上午9:29:30 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/records.dat.len (No such file or directory)
上午9:30:55 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:32:51 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:33:46 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/names.dat.keystream.len (No such file or directory)
上午9:34:03 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:41:01 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/records.dat.len (No such file or directory)
上午9:42:08 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/index/bytecodeanalysis/bytecodeAnalysis.len (No such file or directory)
上午9:43:12 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/names.dat.keystream.len (No such file or directory)
上午9:43:48 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:44:34 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:45:00 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/names.dat.keystream.len (No such file or directory)
上午9:45:10 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/caches/contentHashes.dat.keystream.len (No such file or directory)
上午9:46:06 FileNotFoundException: /Users/air/Library/Caches/AndroidStudio1.4/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