First place Fall 2017 Senior Design Competition in Computer Science app that my group and I made during our CS 472 class at UNLV.
Premise of the app was to make it easier for college students to have spontanious meet ups with other students on campus by sharing your general location (either private or public) to all surrounding app users. When someone sees your 'Marco' they can choose to 'Polo' you back. This will make it so that both of the users can now see your exact GPS location in real-time so that you can meet up. Public marco mode also serves as an easy way to mark and send out information for events taking place on campus and recruiting like minded people.
You will need Android Studio to build. Not sure how the app will behave as it has not been maintained and relies heavily on internet services such as Google Maps, Firebase Database, Google auth and Facebook auth.
MarcoPoloApp/app/src/main/java/com/polo/marco/marcopoloapp/ has most of our actual source code.