GlucoDataHandler is a multi-platform Android application (phone, Wear OS, Android Auto) that aggregates continuous glucose monitoring (CGM) data from numerous sources including LibreLinkUp, Dexcom Share, Medtrum, Nightscout, xDrip+, Juggluco, AndroidAPS, and notification reading from other diabetes apps. It presents glucose values, trends, deltas, IOB/COB, and historical charts via home screen widgets, lock screen overlays, Always-On Display, Wear OS complications and tiles, and Android Auto media player. The app features a highly configurable alarm system with per-type sound/vibration/snooze settings and full-screen notifications. The codebase is organized into four Gradle modules: `common` (shared library), `mobile` (phone app), `wear` (Wear OS app), and `auto` (Android Auto companion). The common module contains core data handling, a Room database for glucose history, a custom event bus (InternalNotifier), an abstract background task framework (BackgroundTask/BackgroundTaskService), and a chart rendering pipeline with bitmap caching (ChartBitmapHandler, BitmapPool). The mobile and wear modules provide platform-specific services, activities, preferences, and UI components. Health Connect integration and a local xDrip-compatible HTTP server are also included. The application demonstrates solid engineering with reusable patterns: the notifier pattern decouples data sources from UI updates; the background task framework abstracts periodic polling with alarm-based scheduling; and the bitmap pool reduces allocation pressure for frequent widget/complication renders. However, the codebase carries significant integration surface with third-party CGM services and deprecated API usages, posing medium technical drift risk. Test coverage is limited. The project is actively maintained with recent commits and open issue triage.