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The shortcut for this action is Shift+F1 but it is always grayed out even I have pointed JDK documentation path to the docs folder (the docs folder is unzipped from jdk-7u2-apidocs.zip ).
Thanks
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Use View | Quick Documentation or the corresponding keyboard shortcut (by default: Ctrl + Q on Windows/Linux and Ctrl + J on macOS or F1 in the recent IDE versions). See the documentation for more information. +1, could not find Preferences in IntelliJ Idea CE for Android. It is CTRL+J on Mac.
From the main menu, select File | Project Structure | Project Settings | Project. If the necessary JDK is already defined in IntelliJ IDEA, select it from the SDK list.
You need to specify the docs/api subdirectory of the unpacked documentation or use https://docs.oracle.com/javase/8/docs/api/ URL for the external documentation feature to work.
File -> Project Structure... then here : 
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