I hope your roommate doesn't do this. If you do have conclusive evidence to prove that your roommate took photos, you can directly ask to see the photo album, or report it to the counselor for the counselor to check it on the spot. At this time, privacy issues will not be involved, because the other party may have violated his privacy.
To tell the truth, if it is not a joke, the consequences really dare not think. We also often take photos in boys' dormitories, but after the photos are taken, we make black expression packs and send them directly to the group ... (~ y ~~ * covering your mouth)
If you can't find direct evidence to prove it, then continue to pay attention in the future. You can buy a curtain when you change clothes, lock the door when you go to the bathroom, and see if there are suspicious people around you when you change clothes in the bathroom (those who don't use their mobile phones for a long time, take a basket with them, because there may be a camera hidden in it, and even a wonderful video chat with their boyfriend in the bathroom).
Girls must protect themselves outside. When they go to the mall to go to the bathroom and go to the hotel, they must learn to check whether there are hidden cameras (most of them are for the purpose of selling for profit). It may be a bit far, from the dormitory to the society, but this incident is really a wake-up call. I hope the subject will pay attention.