Personal Safety SOS App with Live Location Sharing

In an emergency, nobody opens an app, navigates menus and types a message. Safety apps fail when they ask for fine motor control and attention under stress — the correct interface is one big button and everything else automatic. This project builds that: a press-and-hold SOS that broadcasts live location to a trusted circle every 15 seconds, sends each contact their configured channel (SMS, push notification, phone call), opens an audio channel, and keeps running with the screen locked through a foreground service. A check-in timer covers the quieter case: set it when heading out, and a missed check-in raises the same alert with the last known location automatically.

1. The user builds a trusted circle of contacts, each with their preferred SOS notification channels.
2. Pressing and holding SOS starts a foreground service that captures the current location and opens the alert session.
3. The alert pipeline notifies each contact through their configured channels with a live-tracking link.
4. Every 15 seconds the service broadcasts a fresh location fix; the active-alert screen shows elapsed time, battery and delivery status.
5. Contacts opening the link see the live map with the user's moving position and accuracy radius.
6. The check-in timer runs independently: on expiry without check-in, the same alert pipeline fires with the last known location.
7. The user cancels from the alert screen with a confirmation step to prevent accidental dismissal.

Tech stack:

• Kotlin (Android app)
• Foreground Service (lock-screen-resilient alerts)
• Fused Location Provider (location fixes)
• Firebase Cloud Messaging (push notifications)
• SMS Manager API (fallback SMS alerts)
• Room (contacts, timers, alert history)
• Google Maps SDK (live tracking view)
• Material 3 UI components

• [One-press SOS] Press-and-hold the SOS button (2 seconds) to raise an alert — no menus, no typing, works from the lock screen widget.
• [Live location broadcast] Location updates every 15 seconds to the trusted circle for the duration of the alert, with accuracy shown honestly.
• [Per-contact channels] Each trusted contact configures SMS, push, phone call or any combination for SOS events.
• [Check-in timer] Set a timer when heading out; a missed check-in auto-raises an alert with the last known location.
• [Foreground service] The alert survives screen lock and app backgrounding; a persistent notification shows elapsed time.
• [Delivery confirmations] Per-contact sent/delivered status is shown in the active-alert screen.
• [Safe places] Saved locations (home, hostel, office) with arrival detection that can auto-resolve an active timer.

• Complete Android app source (Kotlin) with SOS flow
• Alert pipeline with per-contact channel dispatch
• Trusted-circle and check-in timer management
• Live tracking view for contacts
• Test plan for the alert flow (staged drills documented)
• Project report PDF (background, alert-pipeline design, Android service architecture, methodology)
• PPT presentation for final review
• Viva Q&A preparation document (foreground services, location APIs, FCM, SMS fallbacks)

• SMS delivery depends on the carrier and needs SMS permission granted; delivery is best-effort and reported honestly per contact.
• Location accuracy depends on the device GPS and environment — fixes carry their accuracy radius, never a false precision.
• The app assists contacting trusted people; it is not a replacement for calling local emergency services, and the report states this clearly.
• Battery impact during an active alert is real (GPS + radio every 15 seconds); measured drain is documented from test runs.
• iOS is out of scope — this is an Android build.