Project Overview

This project re-implemented an existing iOS sales and inventory management application for Android, preserving feature parity and ensuring stable operation on Android smartphones.
After analyzing the source code and business flows of the current app, we streamlined the UI and implemented a mechanism to write data directly to the production database on the server, enabling on-site users to check inventory and product information instantly.
Finally, we validated all functions on an emulator and confirmed behavior equivalent to the existing iOS app.

Technology Stack & Development Tools Used

• Programming Language: Java
• Database: Oracle
• Task Management Tools: Excel / Backlog
• Communication Tools: Chatwork / Backlog / Zoom
• Other Tools: Android Studio

Client Challenges

Migrate the iOS-based sales and inventory app to Android without compromising functionality.

Client Requirements

Stable operation on Android smartphones
The iOS app already used in daily operations needed to run as-is on Android devices. Operational stability without disrupting business was mandatory.

Preserve all existing features
All operational features in use—such as sales and inventory management—had to be retained. Migration without any functional gaps was a key requirement.

Simple and intuitive usability
Because the app is used in the field, complex operations would burden users. A simple, easy-to-understand UI was required.

Instant verification on site
It was important to enable immediate checks of inventory status and product information on the spot. Fast, on-site usability was essential.

Our Proposal & Approach

Started with analysis of the existing app
We investigated the iOS app’s source code and business flows to accurately capture functional requirements before development.

Re-implemented for Android
We prioritized a simple, easy-to-understand screen structure for intuitive use on Android devices.

Improved data persistence approach
Replacing the iOS method of “temporarily saving to SQLite and then syncing to the server DB,” the new app writes directly to the production database on the server, enabling instant on-site confirmation of inventory and product information.

Comprehensive functional testing
Post-development, we tested all functions on an emulator and confirmed behavior equivalent to the iOS app, enabling a smooth and confident migration to Android.