How to search and send notifications to people nearby in flutter firebase app?

Question

I need a way to search for people nearby and send them a push notification. Doesn't seem like I can use topics for this, so probably need a way to query for users?

Answer 1

1. save users locations in firestore (using geolocator plugin)

2. get current user location (using geolocator plugin)

3. Calculate the distance between the user and other users (using geolocator plugin)

   Geolocator().distanceBetween();
   

4. Put a condition as example if(distance < 200) show users

5. send a notification to the selected user (Firebase Cloud Messaging)

Sorry I couldn't give more details because they are many questions.