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Developer Builds Battery-Efficient Android Geofencing App to Auto-Silence Phones

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After repeatedly disrupting prayers and meetings with an unsilenced phone, a developer set out to automate sound-profile changes based on location. Existing apps either drained batteries, relied on cloud tracking, or failed to restore audio settings correctly. The developer built Muffle, which uses Google Play Services' GeofencingClient so the operating system handles boundary detection instead of constant GPS polling. To avoid false triggers from brief signal bounces, a dwell-time threshold was added, and geofence data is stored in a local Room database so rules reload after a reboot. The article describes the approach as focused on local processing, privacy, and a lightweight design.

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