No Sweets App

An Expo React Native app that tracks your location in the background and sends a push notification whenever you're within 100 meters of a grocery store or restaurant — reminding you of your no-sweets goal and suggesting low-cholesterol, no-heartburn healthy snacks.

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Features

• Background GPS tracking using expo-location + expo-task-manager
• Detects grocery stores and restaurants via Google Places API
• Push notifications with snack suggestions (tap to open full list)
• 30-minute cooldown per location to avoid alert spam
• Day counter and progress bar for your 30-day challenge
• All snacks are low-cholesterol and avoid heartburn triggers

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Requirements

• Node.js 18+
• Expo CLI: npm install -g expo-cli
• A physical iOS or Android device (background location does not work on simulators)
• A Google Places API key (free tier works for personal use)

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Setup

1. Install dependencies

cd no-sweets-app
npm install

2. Add your Google Places API key

Create a .env file in the project root:

GOOGLE_PLACES_API_KEY=your_key_here

Or edit src/constants.ts and replace 'YOUR_GOOGLE_PLACES_API_KEY' directly.

To get a key:

1. Go to https://console.cloud.google.com
2. Create a project and enable the Places API
3. Generate an API key under Credentials

3. Install Expo Go on your phone

Download Expo Go from the App Store (iOS) or Google Play (Android).

4. Start the development server

npx expo start

Scan the QR code with your phone camera (iOS) or the Expo Go app (Android).

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Building for Production (optional)

To install as a standalone app on your phone:

# Install EAS CLI
npm install -g eas-cli

# Login to your Expo account
eas login

# Build for iOS (requires Apple Developer account)
eas build --platform ios

# Build for Android (generates APK you can sideload)
eas build --platform android

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Important: Background Location on iOS

iOS requires explicit permission for background location. When prompted:

1. Choose "Allow Always" — not "While Using"
2. If you chose "While Using" by mistake, go to: Settings > Privacy > Location Services > No Sweets > Always

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Adding @react-native-async-storage/async-storage

This package is required for cooldown tracking. Install it:

npx expo install @react-native-async-storage/async-storage

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File Structure

no-sweets-app/
├── App.tsx                  # Root app, navigation, notification listeners
├── app.json                 # Expo config (permissions, plugins)
├── package.json
├── babel.config.js
└── src/
    ├── constants.ts         # Geofence radius, cooldown, API key, challenge dates
    ├── snacks.ts            # Snack data (low-cholesterol, no heartburn)
    ├── locationTask.ts      # Background location task + Places API query
    ├── notifications.ts     # Push notification setup and sending
    ├── HomeScreen.tsx       # Main screen: progress, toggle, tips
    └── SnacksScreen.tsx     # Snack suggestions screen (opened via notification tap)

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Challenge Details

• Start date: March 9, 2026
• Duration: 30 days
• All snacks: low-cholesterol, no known heartburn triggers (no fried food, no spicy, no citrus, no chocolate)