Hello World Self-Aware

This is a small 121 KB Hello World app that lets the Android device introduce itself by "name" (serial number), Android version and API Level.

Hello World apps are usually not supposed to be useful. However, you may use this tiny app to quickly find out the Android version and API Level of a device; all displayed information can be copied to the clipboard with a simple long-press. Because it's so tiny and doesn't need any permissions, it's very easy to install even on older and less powerful hardware.

Screenshot

Download

You can download the latest version from the GitHub Releases page. This app is not available on the Google Play Store. You will download an .apk file that can be installed directly on your Android device.

Building from Source

If you'd like to build the app yourself:

1. Clone the repository: git clone https://github.com/Appliberated/HelloWorldSelfAware.git

2. Open the project in Android Studio.

3. Let Gradle sync the project.

4. Click Run 'app'.

The project is configured to work with a minimum API level of 9 (Android 2.3 Gingerbread).

Technical Notes

This project is intentionally kept simple as a learning example. It is written in Java and uses the classic, plain Android SDK (android.app.Activity, android.widget.TextView, etc.) without any modern androidx libraries or Jetpack Compose. In fact, the dependencies section in the build file is empty.

This direct-to-the-SDK approach is the main reason the final .apk is only 121 KB. While this is not the recommended architecture for complex, modern applications, it serves as a clear example of a minimal, dependency-free Android app. The original code was written in 2017 and has been maintained to run on the latest Android versions while preserving this original, lightweight approach.

Contributing

Thank you for contributing! Hello World Self-Aware is designed to be as simple as possible, but you can still help with:

• testing and reporting bugs
• creating a nice Android app icon to replace the current one

Support my work

Hello World Self-Aware is a free app, and I enjoy creating and sharing learning projects like this, along with other useful free apps. If you'd like to support my work, consider checking out the following Pro applications:

Pitch Black Wallpaper Pro	RGB Color Wallpaper Pro
Pitch black & dark wallpapers AI-generated wallpapers Enhances battery life Reduces eyestrain	Set any color as wallpaper Endless color options, built-in & custom Reduce visual clutter Enhanced device aesthetics

License

Hello World Self-Aware is released under the MIT License.