fodome promo video
fodome is an Android app that connects food donors with people in need. Each food post captures location details during upload.
How it works
- When a user first enters the home feed page, all posts are shown (location access not yet enabled)
- After enabling location, the user confirms their current position
- Posts are then filtered by proximity with a default range of 20km
- Users can customize the range from 1km to 1000km
- For easier access, frequently used ranges (10km, 20km, 50km) are displayed as chip filters
- A "custom range" option reveals a slider for precise distance selection (1-1000km)
Technical Implementation
The app implements a custom geo-query function that:
- Compares the user's current location (latitude/longitude) with each post's location
- Calculates the distance between these points
- Filters out posts beyond the specified range
- Re-runs this calculation whenever the range is updated
The function has a time complexity of O(n) where n is the number of posts. For performance optimization with large datasets, we could implement pagination - computing only the first 50-100 posts initially and loading more as the user scrolls. This approach would significantly improve performance once the app reaches a million+ posts.