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

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A developer created an Android app called Muffle after witnessing repeated phone disruptions in quiet public spaces, aiming to automate ringer mode based on location. Initial attempts using GPS polling via LocationManager proved impractical, draining device battery within four hours. The final solution relied on Google Play Services' GeofencingClient API, which uses a fused location provider to wake the app only when a defined boundary is crossed, dramatically reducing power consumption. A foreground service with a persistent notification was implemented to prevent the system from terminating the app during memory pressure. Key engineering challenges included managing Android's Do Not Disturb permission requirements, resolving conflicts between calendar and location-based rules, and eliminating a 'flicker' effect caused by GPS signal jitter at geofence boundaries.

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