Import external Java class in Android Studio

I have an Android project with its root folder at `C:\Users\myname\Documents\MyApplication`. In one of the Java files in my project, I would like to use a Java class located in the file `C:\Libraries\`. How do I do this?

I tried going to File > New > Import Module... and selecting `C:\Libraries` as "Source directory", but it says it's not a valid project. But I don't want to import an entire project, I just want to import one file.
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