Payfrit Food Android

Native Android app for the Payfrit Food product intelligence platform.

What It Does

Users scan food product barcodes, get health scores (0-100), NOVA processing classification (1-4), nutrition facts, ingredient analysis, and discover healthier alternatives from sponsors.

Stack

Language: Kotlin
UI: Jetpack Compose + Material 3
Architecture: MVVM (ViewModel + StateFlow)
Networking: Retrofit 2 + kotlinx.serialization
Image Loading: Coil
Barcode Scanning: CameraX + ML Kit
Auth Storage: EncryptedSharedPreferences (Jetpack Security)
Min SDK: 26 (Android 8.0)
Target SDK: 34

API Base URLs

Production: https://food.payfrit.com/api
Dev: https://dev.payfrit.com/api (set via BuildConfig)

Key Endpoints

GET /scan.php?barcode=X — product lookup
GET /search.php?q=X — product search
GET /alternatives.php?productID=X — healthier alternatives
POST /user/login.php — email/password login
POST /user/register.php — registration
GET /user/account.php — profile
GET /user/scans.php — scan history
GET /user/favorites.php — favorites list
POST /user/favorites.php — add favorite
DELETE /user/favorites.php?productID=X — remove favorite
DELETE /user/account.php — delete account (GDPR)

Auth

Bearer token via Authorization: Bearer <token> header
Token stored in EncryptedSharedPreferences
Public endpoints (scan, search, alternatives) work without auth
User endpoints (history, favorites, account) require auth

Project Structure

com.payfrit.food/
├── PayfritFoodApp.kt          # Application class
├── MainActivity.kt            # Single activity
├── data/
│   ├── model/Models.kt        # All data classes
│   ├── local/AuthStorage.kt   # Encrypted token storage
│   ├── remote/FoodApiClient.kt # Retrofit API client
│   └── repository/            # ProductRepository, UserRepository
├── navigation/FoodNavHost.kt  # Bottom tab + detail navigation
└── ui/
    ├── theme/                 # Material 3 theme
    ├── components/            # ScoreRing, NOVABadge, DietaryPills, ProductCard
    └── screens/
        ├── scan/              # Camera barcode scanner + manual entry
        ├── product/           # Product detail with scores, nutrition, ingredients
        ├── alternatives/      # Filtered alternatives list with sponsor cards
        ├── favorites/         # Saved products
        ├── history/           # Scan history
        └── account/           # Login/register/profile/GDPR

Building

Keystore passwords in keystore.properties (gitignored)
Debug builds point to dev API
Release builds point to production API

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