How one developer built a battery-efficient geofencing app to auto-silence Android phones

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A developer built an Android app called Muffle after his phone vibrated loudly during Friday prayers, prompting him to automate sound profile switching based on location rather than time. The app uses Android's Geofencing API and FusedLocationProviderClient to detect when a user enters or exits a defined area, such as an office or place of worship. A key design choice was decoupling the monitoring service from the UI via a Foreground Service, with a 30-second loitering delay to avoid false triggers near zone boundaries. To guard against aggressive OEM battery optimisation killing background processes, the developer routed geofence events through a lightweight BroadcastReceiver that hands off work to WorkManager, ensuring reliable execution even if the OS reclaims memory. The project highlights the real-world complexity of building trustworthy location-aware Android utilities that balance responsiveness with battery efficiency.

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