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I have a folder with a few java files (Translated into Java by CS2J) that i want to use to my Android Project.How can i import them to my project without adding those classes manually to my project?

Just copy all of those java files and paste them in the desired package in android under src folder. If those java files do not have compile time error then you program will run.
In case you have to access them, Just make the object and put your cursor to the ClassName then hit Alt + Enter .
I hope this helps.
Paste those classes inside package inside the java folder directly from android studio