Key Mapper

An Android app to remap the buttons on your devices

Mobile App DevelopmentKotlinGPL-3.0

Abstract

Key Mapper is an open-source Mobile App Development project. An Android app to remap the buttons on your devices. Make custom macros on your keyboard or gamepad, make on-screen buttons in any app, and unlock new functionality from your volume buttons! It is built using Kotlin, Android. The complete source code is publicly available on GitHub under the GNU General Public License v3.0, making it a useful reference for students building a Mobile App Development mini project or final-year project.

1. Introduction

Make custom macros on your keyboard or gamepad, make on-screen buttons in any app, and unlock new functionality from your volume buttons!

Most devices are already supported, with new devices being added over time. Let us know if it's not working for you and we can prioritize your device.

Not enough keys? Design your own on-screen button layouts and remap those just like real keys!

2. Objective

An Android app to remap the buttons on your devices

This project demonstrates how Kotlin, Android can be applied to a real-world Mobile App Development problem.

4. Technology Stack

KotlinAndroid

5. System Requirements

General requirements for this technology stack — check the README for exact versions.

  • Android Studio (latest)
  • JDK 17
  • Android device or emulator
  • Git (to clone the repository)

6. Installation & Setup

git clone https://github.com/keymapperorg/KeyMapper.git
cd KeyMapper

Full setup instructions are in the project README.

7. Future Enhancements

Suggested extensions you can add to make this your own project.

  • Add push notifications with Firebase Cloud Messaging
  • Add offline support with local caching
  • Publish an internal test build on the Play Store

8. Viva / Review Questions

Common questions examiners ask for projects in this domain.

  1. Which framework is used and why (native vs cross-platform)?
  2. How is app state managed across screens?
  3. Where is the data stored — locally, Firebase or a REST backend?
  4. How are permissions (camera, location, storage) handled?
  5. How would you publish this app to the Play Store / App Store?

9. Source Code & License

This project is developed by keymapperorg and published on GitHub under the GNU General Public License v3.0. Please follow the license terms and credit the original author when you use or modify this code.

View Source on GitHubDownload ZIP

Want to build this as your internship project?

Work on a Mobile App Development project like this with mentor guidance, weekly reviews and an internship certificate from Training Trains, Erode — online or offline.

Apply for Mobile App Development Internship