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Samsung Health Sensor Implementation Checklist

✅ Already Completed

  • Samsung Health Sensor SDK AAR file added
  • Android permissions configured in AndroidManifest.xml
  • Method Channel and Event Channel set up
  • WatchBridgeService (Flutter) implemented
  • HealthTrackingManager (Kotlin) implemented
  • MainActivity (Kotlin) updated with full implementation
  • HeartRateData model updated with IBI support
  • Kotlin coroutines dependency added
  • Error handling and logging implemented

🔧 Before You Start Testing

1. Build the Project

cd android
./gradlew clean
./gradlew build
cd ..

2. Check Device Requirements

  • Galaxy Watch4 or higher
  • Watch is paired and connected
  • Samsung Health app is installed on watch
  • Watch is charged (>20% battery)

3. Deploy to Watch

# List connected devices
flutter devices

# Run on watch
flutter run -d <watch-device-id>

📝 Testing Steps

Step 1: Permission Check

final watchBridge = WatchBridgeService();
final status = await watchBridge.checkBodySensorPermission();
print('Permission status: $status');

Expected: PermissionStatus.notDetermined or PermissionStatus.granted

Step 2: Request Permission

final granted = await watchBridge.requestBodySensorPermission();
print('Permission granted: $granted');

Expected: Permission dialog appears, user grants permission

Step 3: Connect to Service

final connected = await watchBridge.connectToWatch();
print('Connected: $connected');

Expected: true (connection successful)

Step 4: Start Tracking

final started = await watchBridge.startHeartRateTracking();
print('Tracking started: $started');

Expected: true (tracking started)

Step 5: Receive Data

watchBridge.heartRateStream.listen((data) {
  print('HR: ${data.bpm} bpm');
  print('IBI: ${data.ibiValues}');
  print('Status: ${data.status}');
});

Expected: Heart rate data every 1-2 seconds

Step 6: Stop Tracking

await watchBridge.stopHeartRateTracking();
await watchBridge.disconnectFromWatch();

Expected: Tracking stops, no more data

🐛 Debugging

Check Logcat

# Filter for health-related logs
adb logcat | grep -i "health\|MainActivity\|HealthTrackingManager"

# Or specific tags
adb logcat MainActivity:D HealthTrackingManager:D *:S

Common Issues

Issue: "Health tracking manager not initialized"

  • Solution: Restart the app, check MainActivity.onCreate()

Issue: "Not connected to Health Tracking Service"

  • Solution: Call connectToWatch() before startHeartRateTracking()

Issue: "Permission denied"

  • Solution: Check Settings → Apps → FlowFit → Permissions

Issue: "Sensor not supported"

  • Solution: Device doesn't support continuous HR tracking (need Watch4+)

Issue: No data received

  • Solution: Wear watch on wrist, ensure good skin contact

🎯 Integration Points

Update Your UI

wear_dashboard.dart

// Add heart rate display
StreamBuilder<HeartRateData>(
  stream: watchBridge.heartRateStream,
  builder: (context, snapshot) {
    if (snapshot.hasData) {
      return Text('${snapshot.data!.bpm} BPM');
    }
    return Text('--');
  },
)

activity_tracker.dart

// Start tracking when workout begins
await watchBridge.connectToWatch();
await watchBridge.startHeartRateTracking();

// Stop when workout ends
await watchBridge.stopHeartRateTracking();

Save to Supabase

watchBridge.heartRateStream.listen((data) async {
  if (data.bpm != null) {
    await supabaseService.insertHeartRate(
      bpm: data.bpm!,
      timestamp: data.timestamp,
      ibiValues: data.ibiValues,
    );
  }
});

📊 Data Analysis

Heart Rate Zones

String getHeartRateZone(int bpm) {
  if (bpm < 100) return 'Resting';
  if (bpm < 120) return 'Light';
  if (bpm < 140) return 'Moderate';
  if (bpm < 160) return 'Hard';
  return 'Maximum';
}

Heart Rate Variability (HRV)

double calculateHRV(List<int> ibiValues) {
  if (ibiValues.length < 2) return 0;
  
  // Calculate RMSSD (Root Mean Square of Successive Differences)
  double sumSquaredDiffs = 0;
  for (int i = 1; i < ibiValues.length; i++) {
    double diff = (ibiValues[i] - ibiValues[i-1]).toDouble();
    sumSquaredDiffs += diff * diff;
  }
  
  return sqrt(sumSquaredDiffs / (ibiValues.length - 1));
}

🚀 Next Features

  • Background heart rate monitoring
  • Heart rate alerts (too high/low)
  • Workout heart rate zones
  • HRV tracking and trends
  • Resting heart rate calculation
  • Heart rate recovery after exercise
  • Integration with sleep tracking

📚 Reference

  • Samsung Health Sensor SDK: Provides heart rate data
  • HealthTrackingService: System service for sensor access
  • HealthTracker: Manages individual sensor tracking
  • DataPoint: Contains sensor readings (HR + IBI)
  • ValueKey: Keys for extracting values from DataPoint

✨ Tips

  1. Wear the watch properly - Snug fit, sensor on wrist bone
  2. Wait for stabilization - First readings may be inaccurate
  3. Handle null BPM - During measurement, bpm can be null
  4. Use IBI for HRV - More accurate than just BPM
  5. Test on real device - Emulator doesn't support sensors
  6. Check battery impact - Continuous tracking drains battery
  7. Implement foreground service - For background tracking