All 7 Maps & Geolocation in Flutter questions
More in Maps & Geolocation in Flutter
How does the google_maps_flutter package let you actually embed an interactive Google Map directly within your Flutter app? How does the geolocator package let you actually properly request and retrieve a user's own genuine current GPS location within a Flutter app? How should you properly and correctly handle requesting location permissions across the several genuinely different possible permission states, including denied, granted, and permanently denied, using the geolocator or permission_handler packages? How does geocoding let you convert between a genuine human readable street address and its own corresponding precise latitude and longitude coordinates, and what package genuinely provides this particular specific capability? What are important battery usage and privacy considerations when continuously tracking a user's own real time location in the background, such as for a genuine fitness tracking app or a delivery driver app? How can you properly implement geofencing, meaning triggering a specific action whenever a user's own device actually enters or exits a genuinely predefined specific geographic area, within a Flutter app?
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Flutter › Maps & Geolocation in Flutter

How can you properly display custom markers and draw a polyline route directly on a map, such as showing a delivery driver's own current position together with their planned route to a customer?

Intermediate

Answer

Displaying a custom marker on a GoogleMap involves creating a Marker object with a specific given position and an optionally genuinely fully custom icon, while drawing a route requires creating a Polyline object defined by a genuinely ordered list of individual LatLng coordinate points representing that particular route's own actual path, and both of these can genuinely be updated dynamically in real time as a driver's own actual position continues to genuinely change, letting a customer watch that particular delivery's own progress update live directly on the map.
Polyline(
  polylineId: PolylineId('route'),
  points: [LatLng(37.7749, -122.4194), LatLng(37.7849, -122.4094)],
  color: Colors.blue,
)
Real-world example A food delivery app draws a blue polyline directly on the map showing a driver's own current planned route to a customer's address, continuously and dynamically updating both that driver's own marker position and the polyline itself in genuine real time as they actually physically drive.

Common follow-ups: How do you actually properly obtain the required detailed turn by turn route data specifically needed to draw an accurate polyline?;How do you actually properly customize a marker's own specific visual icon beyond the map's own default marker appearance?

Custom Widgets & Reusable Components;WebSockets & Real Time Data in Flutter
All 7 Maps & Geolocation in Flutter questions