How One Developer Built a Battery-Efficient Geofencing App to Auto-Silence Phones

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A developer built Muffle, an Android app that automatically silences phones based on location, after a disruptive ringtone incident at a public library highlighted the limits of manual phone management. The app uses Android's GeofencingClient API, which offloads location tracking to Google Play Services, avoiding the battery drain caused by continuous GPS polling. A key technical challenge was ensuring geofences persisted after device restarts, solved by implementing a BroadcastReceiver that re-registers boundaries on boot. The developer found that battery drain stemmed less from GPS hardware and more from context switching and network requests tied to location metadata. Tuning the geofencing radius and loitering delay parameters proved critical to avoiding false triggers, such as the phone silencing while the user merely drove past a registered location.

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