I found a solution just now since I can't find any other solution for a long time.
suppose:
- your lib name is: libxxx.jar
- javadoc name is docs.zip
under folder .idea/libraries, you can find libxxx.xml. replace JAVADOC with
<JAVADOC>
<root url="jar://C:/yourpath/doc.zip!/" />
</JAVADOC>
then ctrl+alt+y to sync the project. (Don't do "Sync Project with Gradle files", it will delete the changes)
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