AlertSpot: An open‑source, battery‑friendly transit alarm for Android

说明与用途

AlertSpot 是一款免费、开源的 Android 应用，使用地理围栏在到达指定位置时发出警报，节省电池并保护隐私。

问题

Commuters often miss stops because they fall asleep or are distracted, yet existing location‑based reminder apps drain battery, require cloud accounts, or track telemetry.

结果

AlertSpot delivers a battery‑efficient, privacy‑first transit alarm that reliably triggers on geofence entry without cloud dependencies, achieving high usability for commuters.

工作流

• 1. Install AlertSpot from GitHub or APK release.
• 2. Open the app and use the map to drop pins or search for a destination.
• 3. Set a custom radius (meters or kilometers) for the geofence.
• 4. The app caches OSM tiles locally for offline map use.
• 5. AlertSpot runs a foreground service with a persistent notification.
• 6. It polls location adaptively: low frequency when far, higher when approaching.
• 7. When within the geofence, a full‑screen intent with looping audio and vibration wakes the device.
• 8. The app re‑registers geofences after device reboot via BOOT_COMPLETED intent.

证据

AlertSpot is a lightweight, completely free, and open‑source Android app that fires high‑priority audio and full‑screen alerts when you enter a destination geofence.

来源

It caches up to 600 MB of OpenStreetMap tiles locally so maps load reliably even with unstable transit mobile data.

来源

Runs a continuous foreground service with persistent notification status.

来源