The original title is "Engineering Geofencing: Lessons in Android Battery and Location Accuracy"

Short summary

This article documents building Muffle, an Android app leveraging Google's GeofencingClient API to automatically silence phones in specific locations. Key lessons: delegate location tracking to OS-level APIs to preserve battery rather than polling GPS; handle GPS jitter at geofence edges with dwell-time logic and calendar fallbacks to prevent rapid mode-toggling; use WorkManager instead of custom AlarmManager for reliable background execution across manufacturer-specific battery policies.

• •Battery efficiency requires delegating location tracking to OS-level APIs, not polling GPS directly
• •Geofence jitter causes false triggers at zone edges; dwell-time debouncing and calendar integration prevent mode-toggling
• •WorkManager ensures background tasks execute reliably across different OEM battery management policies

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