Work with motion, location, and environmental measurements as fallible streams of data. This outline emphasizes permissions, coordinate systems, signal quality, and lifecycle cleanup. The titles are ready for future articles; no article content is published here yet.
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1. Availability and Permissions
- Checking Sensor Availability Before Starting Work
- Requesting Motion and Location Permissions in Context
- Handling Permission Changes and Reduced Accuracy
- Device Testing vs. Simulator Capabilities
2. Motion and Orientation
- Accelerometer and Gyroscope Measurements
- Device Motion, Gravity, and User Acceleration
- Attitude, Reference Frames, and Coordinate Conversion
- Pedometer Data and Activity Recognition
- Altitude, Pressure, and Relative Measurements
- Sampling Rates, Noise, Filtering, and Drift
3. Location and Heading
- Location Updates and Accuracy Requirements
- Distance Filters and Energy-Aware Tracking
- Heading, Compass Calibration, and Magnetic Interference
- Region Monitoring and Geofencing
- Visits and Significant Location Changes
- Geocoding, Reverse Geocoding, and Request Limits
- Background Location and App Lifecycle Boundaries
4. Interpreting Sensor Streams
- Timestamps, Stale Samples, and Out-of-Order Events
- Combining Motion and Location Without Shared-State Races
- Distinguishing Missing Data from a Valid Zero Reading
- Designing Features Around Uncertainty and Accuracy
5. Testing and Resource Use
- Injecting Recorded Sensor Data for Deterministic Tests
- Testing Unavailable Hardware and Denied Permissions
- Stopping Updates When a Feature Ends
- Profiling Sensor Work and Battery Usage
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