I want full javadoc when i hover mouse on method but it's only showing the params, whats the problem
已回答

it's not showing the full javadoc
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It sort of looks like when the sources JAR with documentation hasn't been downloaded. Try placing your cursor on the method name you're interested in and pressing CTRL+Q and see if the link for downloading documentation shows up.
Lamphamondahood Did your project using Gradle? Please tick on the option Download Sources in the menu File | Settings | Advanced Settings and then click the Reload button in the Gradle tool window.