How One Developer Built an Auto-Silent App Using Android Geofencing

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A developer built an Android app called Muffle after an embarrassing phone interruption during Friday prayers prompted the idea of location-based sound profile automation. The app uses Google Play Services' GeofencingClient to automatically silence a phone when the user enters a defined location, without requiring manual input. To balance battery life and accuracy, a 60-second loitering delay was implemented so the app only triggers when the user is confirmed to be present, not just passing by. A key technical challenge was GPS signal drift inside concrete-heavy buildings, which caused false exit events and premature volume restoration, requiring a buffer-time workaround. The app also registers a BroadcastReceiver for system reboots to ensure geofences are re-registered and the silent mode continues to function after a device restart.

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