QR Code Scanner and Generator Low-Level System

Dhairya Pandya — Tue, 26 Nov 2024 16:22:21 +0000

Introduction

The QR Code Scanner and Generator is a cutting-edge mobile application designed to offer a seamless and efficient experience for scanning and generating QR codes. Built entirely using Jetpack Compose, the app adopts a declarative UI approach and integrates Material Design 3 components to deliver a responsive, user-friendly interface.

Whether scanning QR codes to access websites, coupons, or contact information, or generating custom QR codes for personal or professional use, the application ensures simplicity and reliability. It caters to a wide audience, from tech enthusiasts to everyday users, with its intuitive design and robust functionality.

Highlights

Modern UI/UX: Designed with Jetpack Compose for a minimalist and visually appealing experience.
Improved Performance: Faster load times and smoother interactions compared to traditional XML-based layouts.
Dynamic Theming: Adapts seamlessly to both light and dark modes.
Feature-Rich: Offers a comprehensive suite of tools for scanning, generating, saving, and sharing QR codes.

Key Features

Fast QR Code Scanning

Quickly scan QR codes with high accuracy.
Supports a variety of QR code types, including URLs, text, contact details, and more.

Effortless QR Code Generation

Generate custom QR codes for any input like text, URLs, and business cards.
Save or share QR codes directly from the app.

Enhanced User Interface

Intuitive navigation and easy-to-use controls.
Designed with materialized components for consistency and elegance.

Smart Features

Instant feedback on successful scans or errors.
Scanning history to access previously scanned or generated QR codes.

Utility Integration

Works seamlessly across multiple Android devices.
Lightweight and optimized for performance.

Architechure

Jetpack Compose: Core framework for UI development, eliminating XML layouts.
Material Design 3: Ensures consistency with modern design guidelines.
MVVM Architecture: Utilized for scalability and separation of concerns.
CameraX Library: Provides efficient access to the device camera for scanning QR codes.
ZXing Library: Decodes QR codes with high accuracy and performance.

Mainactivity.java

QRCodeGenerator.java

SocialMediaSharer.java

QRCodeTypehandler.java

QRCodeScanner.java

Singleton Design Pattern

MainActivity.java

Checkout Github Repo: click here
Demo Link: click here

Zeep Service -Your Travel Partner(Low-Level Design)

Dhairya Pandya — Sat, 17 Aug 2024 05:21:03 +0000

Introduction

Zeep Service is a mobile application designed to facilitate commuting for students between their homes and campus. It provides a unified platform for both drivers and passengers, enabling efficient travel management. Drivers can view and manage their passenger lists for each trip, while students can book rides either through subscriptions or on a per-day basis, with the flexibility to cancel if needed.

The app also features real-time notifications for both drivers and passengers, allowing drivers to see the total number of riders for upcoming trips, and passengers to accept or decline rides. Additionally, it includes a WhatsApp bot for easy communication with customer support and a dashboard for monitoring app usage.

For reliability, Zeep Service integrates Crashlytics, which monitors and reports application errors, including detailed crash data. Automation processes within the app are powered by Quickwork, a Mumbai-based automation company.

Highlights

Seamlessly integrated WhatsApp messaging with QuickWork and Google Sheets to create interactive dashboards, enhancing data visualization and user engagement.
Developed a robust SaaS architecture using Google Firebase, leveraging its ecosystem to ensure a reliable and scalable platform.
Designed an intuitive user interface with Material UI, making trip approvals and cancellations straightforward and user-friendly.
Built a Dialogflow NLP chatbot that accurately understands customer intents, extracts key information, and integrates with Google Calendar for automated scheduling.
Applied proven design patterns such as Adapter, Builder, and Singleton to optimize database connections and ensure a scalable application architecture.

Screenshots

Usecase diagram of the Application

When building a Van Service application, it's essential to map out how each part of the system interacts. A flowchart provides a clear and concise visualization of these interactions, helping both developers and stakeholders understand the entire process. Let’s explore the flowchart for a typical Van Service application, highlighting the key steps and decision points.

Requirements for Each Actor in the Van Service Application

Customer

Registration:
- Must provide a name, email, mobile number, and password.
Login:
- Authenticate using email and password.
Passenger Information:
- Specify type of user (Driver, Passenger), gender, city, and subscription type.
Location Details:
- Provide college name, boarding point, and dropping point.
Ride Management:
- Can generate a Customer ID using name, email, mobile number, and password.
- Can cancel a ride on a specific date.
- Must be able to submit a complaint to the Complain Registry if necessary.

Driver

Profile Management:
- Provide driver-specific details: name, age, driving license (as an image), conductor name, vehicle registration details, and rating.
- Validate driver's information: name, age, license, and vehicle registration.
Vehicle Details:
- Specify vehicle information including model name, company name, type, seating capacity, and number plate.
- Upload vehicle-related images: pictures of the vehicle, driving license, and number plate.
- Validate vehicle details.

Passenger

Registration:
- Must provide the same registration details as a customer, including name, email, mobile number, password, and city.
- Additional details include type of user, subscription type, and boarding point string.
Journey Management:
- Can select and verify the time of dropping and boarding point details.
- Calculate journey time based on start and drop-off times.

Admin (Customer_Mngr)

Customer Management:
- Oversee and validate customer data including customer number, selected driver, and manager ID.
- Validate drivers assigned to customers.
Matching Algorithm:
- Execute the matchmaking algorithm to pair customers with available drivers.
- Manage a list of customer IDs and driver IDs for matching purposes.

Complaint Registry

Complaint Management:
- Register complaints with details such as complaint ID, type of complaint, status, and the customer who raised the complaint.
- Handle the status updates and resolutions of complaints.

Location Details

Location Information:
- Provide and update location details such as the college name, city, and both boarding and dropping points.

Signin/Signup Process

User Signup:
- Collect essential signup information, including name, email, mobile number, user type, gender, and password.
User Login:
- Authenticate using the provided email and password.

Dropping and Boarding Points

Journey Management:
- Specify the dropping point details like time and location.
- Calculate journey time based on start and dropping times.
- For boarding points, provide information on the number of other people, boarding time, and journey time.

Given below is the Use case diagram for the application

(Zoomed in)

Class Diagram

In developing a robust and efficient Van Service application, having a well-structured class diagram is essential. The class diagram serves as a blueprint, providing a detailed view of the system's structure and the relationships between its components. Below is an overview of the class diagram for our Van Service application, highlighting the key entities and their interactions.

Here are some of the classes that are formed here

NotificationSystem.java

PaymentSystem.java

TripDetails.java

RatingSystem.java

CustomerMngr.java

Customer.java

VehicleDetails.java

Driver.java

LocationDetails.java

BoardingPoint.java

DroppingPoint.java

Passenger.java

SignIn.java

This is the overall class Diagram of the application

Main Design Pattern

Observer Design Pattern

DriversChennel.java

Student's Subscription

Main.java

Simplifying the Analogy

Supporting Links
Github
Youtube Video Link

DEV Community: Dhairya Pandya

QR Code Scanner and Generator Low-Level System

Introduction

Highlights

Key Features

Fast QR Code Scanning

Effortless QR Code Generation

Enhanced User Interface

Smart Features

Utility Integration

Architechure

Singleton Design Pattern

Zeep Service -Your Travel Partner(Low-Level Design)

Introduction

Highlights

Screenshots

Usecase diagram of the Application

Requirements for Each Actor in the Van Service Application

Customer

Driver

Passenger

Admin (Customer_Mngr)

Complaint Registry

Location Details

Signin/Signup Process

Dropping and Boarding Points

Class Diagram

Main Design Pattern