How One Developer Built a Battery-Friendly Geofencing Sound Manager for Android

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A developer built an Android app called Muffle after an embarrassing phone ringtone incident in a lecture hall inspired a practical solution to manual sound management. The app uses Android's GeofencingClient API to automatically adjust sound profiles based on the user's physical location, without relying on cloud services or subscriptions. To avoid excessive battery drain, the app offloads location signal processing to the OS rather than polling GPS continuously. A priority system stored in a local Room database resolves conflicts when multiple rules, such as time-based and location-based triggers, overlap. All sound profile changes are handled via WorkManager to ensure reliable execution even if the app process is terminated by the system.

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