The Complete Android 16 Developer Course [Part 5] - POS App

Stop building small demo apps. Build an Android application a real business could use.

In Part 5 of The Complete Android 16 Developer Course, you’ll build a complete Point of Sale system from scratch using Kotlin and Jetpack Compose.

This isn’t a simplified checkout screen or another disconnected tutorial project. You’ll create a production-style electronics retail POS app with a responsive product catalog, live shopping cart, checkout workflow, inventory management, receipt generation, offline storage and sales analytics.

The product catalog includes smartphones, gaming consoles, computers, GPUs, laptops, accessories and other electronics—giving you a realistic project that looks impressive in a professional portfolio.

WHAT YOU’LL BUILD

• A fast, responsive electronics product catalog

• Product search, filtering and category navigation

• A live shopping cart managed through a ViewModel

• Quantity controls and automatic total calculations

• Discounts, taxes and checkout validation

• Multiple and partial payment scenarios

• Offline-first storage with Room Database

• Inventory and stock management

• Out-of-stock protection

• Receipt generation

• Refund and transaction handling

• A sales and analytics dashboard

• Clean navigation between application screens

• Loading, empty and error states

WHAT YOU’LL LEARN

You’ll learn how the parts of a modern Android application work together—not just how to create individual Compose components.

You’ll understand:

• How to structure a scalable Android project

• How MVVM separates UI, state and business logic

• Why cart state belongs in a ViewModel

• How StateFlow keeps Compose screens reactive

• How repositories connect Room to the rest of the app

• How to model products, orders, payments and inventory

• How to handle real-world checkout edge cases

• How to build reusable Material 3 components

• How to keep a growing codebase maintainable

• How to design an application that works without an internet connection

TECHNOLOGIES USED

• Kotlin

• Android 16

• Jetpack Compose

• Material 3

• Room Database

• Hilt dependency injection

• MVVM

• Clean Architecture

• Kotlin Coroutines

• StateFlow

• Compose Navigation

HOW THE COURSE WORKS

We build the application together, one feature at a time. Every architectural decision is explained, and every important line of code is written during the course.

There are no unexplained starter projects, large copy-pasted sections or sudden jumps to finished code. You’ll see how the application grows from an empty project into a complete POS system.

WHO THIS COURSE IS FOR

This course is ideal for:

• Android developers ready to move beyond beginner projects

• Students who want a strong portfolio application

• Kotlin developers learning production-style Android architecture

• Freelancers interested in creating software for local businesses

• Developers who want practical experience with Compose, Room and MVVM

• Students who completed Parts 1–4 of this series

REQUIREMENTS

You should understand Kotlin fundamentals and have basic familiarity with Jetpack Compose.

If you completed Parts 1–4 of The Complete Android 16 Developer Course, you’re ready to begin. Developers joining from elsewhere with equivalent Kotlin and Compose experience will also be able to follow along.

BY THE END OF THE COURSE

You’ll have a complete, portfolio-ready Point of Sale application and a much deeper understanding of how professional Android apps are planned, structured and built.

More importantly, you’ll develop the architectural confidence to create your next application without depending on step-by-step tutorials.

Enroll now and build the Android project that proves you can ship real software.