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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.
In the Package Explorer view, select a Java project and click Project > Generate Javadoc with Diagrams > Automatically. In the Generate Javadoc wizard, under Javadoc command, select the Javadoc command (an executable file).
Accessing the Javadoc from NetbeansSelect the desired package, class or method name, right-click and select Show Javadoc. This will launch your default web browser and navigate to the Javadoc for the selected item.
Here are two fast and easy ways to add Javadoc to IntelliJ so you can see it using the "Quick Documentation" feature: simply hover your mouse on any piece of code or use the Quick Documentation shortcut key, Ctrl+Q for Linux or Windows and F1 on macOS!
Settings | Editor | General |Code Completion | Autopopup documentation in (ms).
UPDATE: latest versions have an option to show JavaDoc on mouse move.
File -> Settings -> Editor -> Code completion.
Check Autopopup documentation in (ms) and choose delay.
Show Javadoc in IntelliJ IDEA 14:
When you write code:
File -> Settings -> Editor -> General -> Code Completion -> Autopopup documentation in (ms)
It's only available when you press CTRL+SPACE It's more usable if you select the pin icon when it popups. The documentation window will be added to the tabs on the right. Later on I recommend to resize the window and to uncheck the Pinned property.
On mouse hover:
File -> Settings -> Editor -> General -> Show quick documentation on mouse move
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