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

PictureActivity

Responsibilities	Collaborators
Contains a Hash object, photo with geolocation, and name of the QRCode	Hash
Takes photo	FireStore
Asks for permission before taking photo	QRCodeActivity
	UserHomeActivity
	LeaderboardAcitvity
	UserManager
	UtilityFunctions

ScanActivity

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
Add the data and details to the firebasefirestore collection	ScanActivity
	Player
	QR_Code
	FirebaseFireStore

SignUpActivity

Responsibilities	Collaborators
Allows user to sign up	LandingPageActivity
Getting the information of the user	LeaderboardActivity
Storing the user's information to FirestoreFirebase	Map
Remember the user, so that the user does not have to log in again	UserHomeActivity
Getting the information such as username, userPhoneNumber, userEmail	UserProfileActivity
Add the data and details to the firebasefirestore collection	ScanActivity
	Player
	QR_Code
	FirebaseFireStore

MapActivity

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	Hash
Ask for permission before accessing the exact location	FirestoreDBHelper
Getting the address through the longitude and latitude

UserHomeActivity

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	Hash
Ask for permission before accessing the exact location	FirebaseFirestore
Getting the address through the longitude and latitude	MapActivity
Set the preference for the permission about the geolocation, take photo	LeaderboardActivity
Perform command	FaceActivity
	UserManager

UserProfileActivity

Responsibilities	Collaborators
Show user's profile	Player
Show user's total score	QR_Code
Show user's ranking and the leaderboard	Hash
Search query	FirebaseFirestore
See scanned QRCodes	LeaderboardActivity
	UserSearchActivity
	FaceActivity

UserSearchActivity

Responsibilities	Collaborators
Search for friends	Player
Search for QRCodes	QR_Code
Query	Hash
Search query	FirestoreDBHelper
LeaderboardActivity
	UserSearchActivity
	FaceActivity
	Friend
	Player
	LeaderboardManager

QRCodeManger

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_Adapter

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

Comment

Responsibilities	Collaborators
Comment on the scanned qrcodes	QRCode
The ability to comment	CommentAdapter

CommentAdapter

Responsibilities	Collaborators
Give the ability and function to comment	QRCode
	Comment

LeaderboardManager

Responsibilities	Collaborators
Show the ranking of top 3	FirestoreDBHelper
	LeaderboardAcitivity

UserManager

|Control and perform the whole task on the user's end| UtilityFunctions| |Sign up on the app| UserHomeActivity| |Add friends|UserProfileActivity| |Take photo|Comment| |Scan QRCodes|Comment_Adapter| |Add comment|| |Remove QRCodes||

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

FirestoreDBHelper

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
	DatabaseHelper
	DatabaseResultCallback