How to Display Multiple Markers on Google Maps with Flutter

Описание: Learn how to easily display multiple markers on Google Maps in your Flutter application using Dart. Follow our step-by-step guide for a seamless experience.
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This video is based on the question https://stackoverflow.com/q/63676234/ asked by the user 'Jessica' ( https://stackoverflow.com/u/4861207/ ) and on the answer https://stackoverflow.com/a/63676522/ provided by the user 'Payam Asefi' ( https://stackoverflow.com/u/1656813/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Display Multiple Markers on Google Maps with Flutter

Creating interactive maps in your Flutter applications can add significant value to your user experience. One of the most exciting features of Google Maps is the ability to display multiple markers. However, many developers encounter challenges when trying to display more than one marker on the map. If you’ve found yourself in this situation, don't worry! Here’s a comprehensive guide on how to effectively show multiple markers on Google Maps using Flutter.

Understanding the Problem

When working with Google Maps in Flutter, a common issue arises when you attempt to add multiple markers to the map. Often, developers find that only the first marker appears, leaving the others behind.

The initial attempts to create multiple markers generally look like this:

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When returning the markers to the GoogleMap widget, you may only see the first marker rendered.

The Solution

To resolve this issue and successfully display multiple markers on Google Maps, follow these organized steps:

1. Create a List for Markers

Instead of using a Set, start by defining a List for the markers. This allows for proper management and visualization of multiple items.

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2. Populate the Marker List

Next, inside your loop where you process the locations, make sure you add each marker to your new markers list.

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Key Point: Validate that your marker data is accurate. If the LatLng coordinates are invalid, Google Maps will not display the markers. Testing with dummy data can be helpful during development.

3. Implement the GoogleMap Widget

With your list of markers correctly populated, you can now return it to the GoogleMap widget. Ensure the parameters are properly set, as shown below:

[[See Video to Reveal this Text or Code Snippet]]

Final Tips

Test with Sample Data: If you face ongoing issues, test your implementation with hardcoded coordinates to ensure markings display as expected.

Debugging: Check console outputs for any anomalies in data entries, especially if markers fail to show.

User Experience: Consider adding visual enhancements like animations or clustering for a better user experience, especially when displaying numerous markers.

By following these steps, your Flutter application should now seamlessly display multiple markers on your Google Map. Happy coding!