Figured it out. AndroidStudio is still in it's "ghetto" stage so if you try to add a library dependency in typical IntelliJ fashion you get a warning telling you that whatever you do in the project/module dialog (which shows up when you select it) actually has no effect on your build and that you must edit build.gradle manually.
In the case of Androidplot 0.5.2 heres what you do:
- Add androidplot-core-0.5.2.jar into your /libs dir
In the dependencies section of build. gradle add:
compile files('libs/androidplot-core-0.5.2.jar')
Once you've done this you should be OK.
Nick