RetroHA is a lightweight and efficient dashboard for Home Assistant, specifically designed for legacy Android tablets intended to serve as wall-mounted home control panels.

Key Features

Bauhaus Canvas Engine: A custom graphics engine. The interface does not use standard Android XML views but is manually rendered on a Canvas. This ensures extreme fluidity even on decade-old devices.
Low-End Hardware Optimization: Minimal RAM usage, no unnecessary libraries, and aggressive caching of graphical layouts.
Bauhaus Design: A minimalist aesthetic inspired by the Bauhaus school—high contrast, geometric shapes, and maximum legibility.
Kiosk Mode: Built-in "Wake Lock" support to prevent the screen from turning off while the panel is active.
Rapid Control:
- Tile Click: Toggle or Execute.
- Light Long Press: Brightness menu with "slide and release" gesture (auto-save).

Libraries & Acknowledgments

This project utilizes the following Open Source libraries (compliant with F-Droid requirements):

Retrofit (Square Inc.) — Apache License 2.0: Type-safe HTTP client for Android and Java.
OkHttp (Square Inc.) — Apache License 2.0: An efficient HTTP client for Android.
Gson (Google) — Apache License 2.0: A Java library that can be used to convert Java Objects into their JSON representation.
MPAndroidChart (PhilJay) — Apache License 2.0: A powerful Android chart view / graph view library.
AndroidX Libraries (Google) — Apache License 2.0: Component libraries for Android.

Technical Requirements

Android: minSdk 14 (Support back to Android 4.0 ICS), optimized for Android 4.4+.
Home Assistant: Requires Server URL and a Long-Lived Access Token.

Roadmap

The current project status and planned features are detailed in TASKS.md.

License

This project is licensed under the GNU GPL v3. See the repository for details.