The document describes a mobile application called Proximity Market that allows users to offer or find goods and services near their location. The app uses a user's GPS, camera, internet connection, and runs on Android OS version 16 or higher. It connects to a server with a MySQL database that performs spatial queries and distance computations to find advertisements near the user's position and output relevant results. The app allows users to login, register, publish new ads, search nearby ads, and may include additional features like account management and notifications.

1. Proximity Market
Mobile & Pervasive Systems - 27/06/2016
Computer Engineering
Greco Fabio, Piscione Pietro

2. The Main Aim
WHO: Anyone
WHAT: Offer or find goods and services
WHERE: “Near” to you
WHEN: Whenever you want
WHY: Because it is simple

3. Technical requirements
● GPS sensor
● Photocamera
● Internet connection
● Android OS (API version >= 16)

4. System architecture
Android application
Hosting serviceServer + MySql DB

5. Server computations
● Assumptions: the earth is sperichal
● Input: position M and distance r
● Computations: obtained the minimum
longitude T1 and maximum longitude T2.
The same for the latitude
Spatial query and distance computations
● Output: advertisements “near” to M

6. Application GUI & functionalities
Login User Registration

7. Publish new
advertisement
Search “near”
advertisementHome

8. Possible improvements
● Account management
● Advertisements management
● Forgotten password recovery
● Login with social network credentials
● Chat within the application
● Notification about “near” advertisements
● Rating mechanism
and so on...

9. References
https://developers.android.com
http://janmatuschek.de/LatitudeLongitudeBoundingCoordinates
https://www.firebase.com/docs/android/api/