📍 GPS Camera

A fast, native Android GPS camera that burns your exact location onto every photo and files each shot into its own album — with a live mini-map, one-tap Open in Maps, and a stamp you can drag, move and resize before you shoot.

🌐 Website · ⬇️ Download APK

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✨ Features

• 📸 Geotagged capture — every photo is stamped with the reverse-geocoded address, decimal coordinates, altitude, accuracy and a timestamp.
• 🗺️ Live mini-map — a real OpenStreetMap thumbnail of your spot is drawn onto the photo and shown live on the viewfinder.
• 👆 Tap to open in Maps — the map thumbnail and the map button open the exact coordinates in Google Maps.
• 🎥 Photo & video — switch modes and record video (saved to Movies/GPSCamera); pinch the preview to zoom.
• 🖼️ Full-screen gallery — tap any shot to open it, swipe between photos, pinch-zoom, then Open in Maps (from EXIF) or Share.
• 🔁 Portrait & landscape — the UI rotates and reflows its controls to a side rail in landscape.
• 🧲 Move & resize the stamp — drag the info block anywhere on the frame and pinch to resize before you capture; the photo is burned exactly as you arranged it.
• 🧭 Standards-compliant EXIF — GPS latitude/longitude/altitude/timestamp + a clickable Maps URL are written into the JPEG, so Google Photos, Lightroom, etc. place it on a map automatically.
• 🗂️ Dedicated album — shots are saved to Pictures/GPSCamera and browsable in the in-app gallery.
• 🌗 Day & night — light/dark theme with a one-tap toggle (defaults to your system setting).
• 🛡️ Resilient location — merges Google Play Services fused location and the platform GPS/network providers, so it works even without Google Play Services.
• ⚡ Fast & native — Kotlin + Jetpack Compose + CameraX, no heavyweight frameworks.

📷 Screenshots

Live viewfinder + mini-map	Full-screen viewer	Landscape

A saved capture — one coordinate format, the address, altitude and a burned-in map:

🏗️ Tech stack

Area	Choice
Language / UI	Kotlin, Jetpack Compose (Material 3)
Camera	CameraX (camera-core, camera2, lifecycle, video, view)
Location	FusedLocationProviderClient + platform LocationManager
Metadata	AndroidX ExifInterface
Maps	OpenStreetMap raster tiles (no API key)
Min / target SDK	26 / 35

🚀 Build

Requirements: JDK 17 and the Android SDK.

# Debug APK
./gradlew :app:assembleDebug

# Signed (debug-key) release APK
./gradlew :app:assembleRelease

The APK is produced at app/build/outputs/apk/<type>/.

✅ Tests

The core is covered by a comprehensive automated suite so the app stays regression-free.

# Pure-JVM unit tests (GPS math, EXIF rationals, map tiling, stamp text)
./gradlew :app:testDebugUnitTest

# On-device instrumented tests (EXIF read-back, stamping, MediaStore storage)
./gradlew :app:connectedDebugAndroidTest

• Unit: GpsFormatTest, SlippyMapTest, PhotoSaverNamingTest
• Instrumented: ExifWriterInstrumentedTest, PhotoStamperInstrumentedTest, PhotoSaverInstrumentedTest

🧱 Architecture

com.gpscamera
├── model/GeoFix               immutable GPS fix
├── util/GpsFormat             DMS / EXIF-rational / stamp-text (pure, tested)
├── util/SlippyMap            web-mercator tile math + maps URLs (pure, tested)
├── location/LocationRepository fused + platform providers, reverse geocoding
├── map/StaticMapProvider      fetch + stitch OSM tiles, draw pin
├── camera/PhotoStamper        burns the info panel + map onto the bitmap
├── camera/ExifWriter          writes GPS EXIF + Maps URL
├── camera/PhotoSaver          saves JPEG to Pictures/GPSCamera (MediaStore)
├── camera/GalleryRepository   reads the album back
└── ui/…                       Compose screens + MainViewModel

🎨 Logo

The app icon was generated with Azure AI Foundry gpt-image-2 (see tooling/generate_logo.ps1).

📄 License

PolyForm Noncommercial License 1.0.0 — free for personal and other noncommercial use.

Map data © OpenStreetMap contributors.