Developer Builds Battery-Efficient Android Geofencing App to Auto-Silence Phone by Location

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A developer created Muffle, an Android app that automatically silences a phone based on the user's location, after an embarrassing incident during a final exam. The app uses Google Play Services' GeofencingClient to offload location monitoring to the system firmware level, avoiding the battery drain of a persistent GPS listener. A lightweight broadcast receiver triggers a ForegroundService to adjust audio settings only when a user enters or exits a defined zone, keeping the app dormant during transit. This architecture reportedly allowed the app to manage hundreds of location-based routines with minimal battery impact, even on older Android devices. The developer noted that managing false positives in dense urban areas proved a greater challenge than initially expected.

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