https://github.com/appliberated/helloworldselfaware
A small Hello World app with self awareness. Tells Android version & API Level.
https://github.com/appliberated/helloworldselfaware
android android-api-level android-version hello-world hello-world-android hello-world-app learning-project serial-number version-number
Last synced: about 19 hours ago
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A small Hello World app with self awareness. Tells Android version & API Level.
- Host: GitHub
- URL: https://github.com/appliberated/helloworldselfaware
- Owner: Appliberated
- License: mit
- Created: 2025-06-21T09:06:01.000Z (7 days ago)
- Default Branch: main
- Last Pushed: 2025-06-21T09:45:00.000Z (7 days ago)
- Last Synced: 2025-06-21T10:35:15.058Z (7 days ago)
- Topics: android, android-api-level, android-version, hello-world, hello-world-android, hello-world-app, learning-project, serial-number, version-number
- Language: Java
- Homepage:
- Size: 285 KB
- Stars: 2
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Hello World Self-Aware
[](app/build.gradle.kts)
[](app/build.gradle.kts)
[](https://github.com/Appliberated/HelloWorldSelfAware/releases/latest)
[](https://github.com/Appliberated/HelloWorldSelfAware)
[](LICENSE)
[](https://github.com/Appliberated/HelloWorldSelfAware/releases)
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](https://en.wikipedia.org/wiki/%22Hello,_World!%22_program) 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](https://github.com/Appliberated/HelloWorldSelfAware/releases/latest) 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](app/src/main/java/com/appliberated/helloworldselfaware/MainActivity.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](app/build.gradle.kts) 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](app/src/main/res/mipmap-xxxhdpi/ic_launcher.png)
## 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](https://www.appliberated.com/). If you'd like to support my work, consider checking out the following Pro applications:
[Pitch Black Wallpaper Pro](https://www.tecdrop.com/pitchblackwallpaperpro/) | [RGB Color Wallpaper Pro](https://www.tecdrop.com/rgbcolorwallpaperpro/) |
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## License
Hello World Self-Aware is released under the [MIT License](LICENSE).