Project Overview
Stopwatch for WearOS is a specialized application built to deliver accurate and efficient time tracking on wearable devices. This project was developed entirely in Kotlin with Jetpack Compose for UI, implementing modern Android development practices.
Key Features
- Precision timing with millisecond accuracy
- Battery-efficient implementation for extended sessions
- Lap recording and history tracking
- Adaptive UI for both circular and square watch faces
- Customizable display options and complications
Technical Implementation
MVVM Architecture Diagram
The app is structured using the MVVM (Model-View-ViewModel) architecture for a clean separation of concerns and maintainability. Kotlin Coroutines power precise timing, Jetpack Compose provides a modern, adaptive UI, and StateFlow enables reactive state updates across the interface. Integrations with Wear OS APIs ensure seamless performance and compatibility with watch hardware.
Core Technologies
Kotlin Coroutines
Asynchronous operations and precise timing
Jetpack Compose
Modern, declarative UI for WearOS
StateFlow
Reactive state management with real-time updates
Wear OS APIs
Platform features and device integration
Adaptive UI & Accessibility
- Optimized for circular and square watch faces
- Large touch targets and clear hierarchy for glanceability
- High-contrast theme and a11y-friendly color usage
- Haptic feedback cues for start/stop/lap interactions
Battery Optimization
- Tick updates via Coroutines with efficient scheduling
- Composition scoped recompositions to avoid overdraw
- Ambient mode handling to reduce refresh rate
- Wake locks avoided; leverages system time for accuracy
Complications & Customization
- Configurable display (elapsed, laps, split)
- Wear OS complications for quick access
- Customizable haptics and animation intensity
- Persistent state across sessions
Testing & Quality
- Unit-tested ViewModels and timing logic
- UI tests for start/stop/lap flows
- Performance profiling on emulator and physical devices
- Crash monitoring during closed beta; 99.8% crash‑free since launch
Performance Highlights
Get the App
Join the beta to test new features early and help improve performance across WearOS devices.