A high-level overview of the main classes and their responsibilities in the QR code hunting app using CRC cards.

LandingPageActivity

Responsibilities	Collaborators
Allows user/player to sign up to create a new account	LeaderboardActivity
Connects with the FireBase FireStore to store the data	QRCodeActivity
Views the first page of the app to the user	SignUpActivity
	Hash
	FireStore

LeaderboardActivity

Responsibilities	Collaborators
Displays the leaderboard with scores	UserProfileActivity
Connects with the FireBase FireStore to store the data	QRCodeActivity
Displays the user's friends' scores	SignUpActivity
	Hash
	FireStore
	Player

QRCodeActivity

Responsibilities	Collaborators
Scans and recognises QR codes and barcodes	LandingPageActivity
Hashes the scanned code and score it based on a scoring system	LeaderboardActivity
Takes a photo of the scanned object	Map
Records geolocation of the scanned code	UserHomeActivity
Adds the score and the hash of the scanned code to the player's account	UserProfileActivity
	ScanActivity
	Player
	QR_Code

QR_Code

Responsibilities	Collaborators
Contains a Hash object, photo with geolocation, and name of the QRCode	Hash
Creates a map of key values of attributes to be used by DB	FireStore
Gets photo of the QR_Code and geolocation	QRCodeActivity
	UserHomeActivity
	LeaderboardAcitvity

Hash

Responsibilities	Collaborators
Contains hashed string	QRCode
Calculates score from hashed string
Generates names from hashed string

Photo

Responsibilities	Collaborators
Stores geolocation of the QR Code internally	QRCode
Shows the whereabouts of the QR Code	Scanner

Player

PlayerAccount

Responsibilities	Collaborators
Store player's information, including the total score, scanned QR codes, and photos locally	QRCodeScanner
Adds new QRCodes to its collection	Map
Deletes QRCodes from its collection	FireStore
Provide a summary of the player's activity, including the highest-scoring QR codes, the number of QR codes, and the total score

FireStore

Responsibilities	Collaborators
Store player's information, including the total score, scanned QR codes, and photos	QRCodeActivity
Adds the new personal file(s) and QR codes to the database when being added	Map
Removes the QR codes from the database when being removed by the user	Player
Store the hash of the scanned QR codes to avoid duplicates	LandingPageActivity
Provide a summary of the player's activity, including the highest-scoring QR codes, the number of QR codes, and the total score	LeaderboardActivity
	UserHomeActivity
	UserProfileActivity

Map

Responsibilities	Collaborators
Show the location of the scanned QR codes on a map	Player
Show other players' activity, including their scanned QR codes and photos	QR_Code
Allow players to search for QR codes in a certain region