Question [Q] [Android Studio] How to import "library" ?

Hello !
I'm struggling since yesterday for use a library into my app.
I managed to have RootTools to work because it was a jar file and I have imported it easily.
But I would like to use a color picker and things becomes more complicated.
Here are the two libraries that could do the trick :
How can I use them ?
I've tried Import module in the Project structure without luck, building HoloColorPicker failed, and so on.
I have read numerous How-To but none of them works... So after 5-6 hours of fight, I'm giving up.