I was planning on beginning a free web course on Android development [1] when it hit me whether it was worth learning native app development with stuff like Ionic, PhoneGap and React Native around.
[1] https://www.udacity.com/course/ud853
Basically, you can make the framework do whatever you want, it just may be more painful to do than just coding the app natively from the start.
If you're doing something that doesn't currently have a plugin for your framework, you're going to need to learn some native development anyway. (Java for Android, Objective C / Swift for iOS.)
You can always choose to use those other things, but you will be better off if you understand native development. You'll understand what you are getting and what are the tradeoffs.
With that being said, and as @Envec83 said, why go through so much trouble when you'd spend the same amount of effort going Native? Look at the job market; yes, you'll find some jobs asking for such hybrid frameworks. However, most will want hands on native development with exposure to hybrid frameworks such as those mentioned above.
In my opinion, you being a first year CS student, and with the likeliness that you'll learn Java along the way, it's a great start to go about learning to build Android mobile apps the native way.
I actually found playing around with Rhino on Android pretty illuminating.
Going native gives you much more flexibility regarding the problems you can solve, and how you can solve them.