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How One Developer Built a Battery-Efficient Geofencing Engine for Android

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A developer building Muffle, an Android app that auto-silences phones based on location, encountered severe battery drain when using 50-meter geofence radii, losing 15% battery in under four hours. To fix this, they designed a tiered proximity system that uses coarse network location to pre-warm the geofence before engaging the more power-hungry GPS chip. The number of registered geofences per user was capped to prevent the LocationManager from being overwhelmed. An hourly AlarmManager fallback was also added to maintain data integrity when geofencing intents are delayed under memory pressure. Unexpectedly, the developer found that mismanaging the BroadcastReceiver lifecycle — not GPS usage — was the single largest contributor to battery drain.

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