How to Create Markers in Different Colors with Google Maps in React Native

Описание: Discover how to customize marker colors in React Native using Google Maps effectively. This guide explains step-by-step how to use different colored markers based on conditions.
---
This video is based on the question https://stackoverflow.com/q/62229392/ asked by the user 'CircleMisty' ( https://stackoverflow.com/u/12767910/ ) and on the answer https://stackoverflow.com/a/62231694/ provided by the user 'CevaComic' ( https://stackoverflow.com/u/13357260/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to have google maps markers in different colors in React Native?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Create Markers in Different Colors with Google Maps in React Native

If you've been working on a map application in React Native using Google Maps, you might have encountered the challenge of wanting to display markers in different colors. For instance, you may want a marker with id: 0 to be red and a marker with id: 1 to be green. However, if you are using a static marker icon, both markers might appear in the same color, either red or green, depending on the icon you set. This guide will guide you through the solution to customize marker colors in a step-by-step manner.

The Challenge: Uniform Marker Colors

In your project, you may have a basic setup that looks something like this:

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

This code simply initializes the coordinates of two markers and references two marker images (red and green). However, when rendering the markers on your map, you might see that they both use the same icon.

The Solution: Conditional Rendering

The solution lies in conditionally setting the marker icon based on the index of the mapped coordinates. You can leverage the modulo operator to alternate between the colors. Here's how you can do it:

Step-by-Step Implementation

Modify the Marker Component: When rendering the markers in the MapView, use conditional logic to select the icon based on the marker's index. This ensures that markers alternate icons based on their order. Your code will look like this:

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

Explanation of the Logic:

The index of the marker in the loop determines which icon to use.

By using the expression index % 2, you can check if the index is even or odd.

If it is even (index % 2 === 0), it will assign the greenMarker.

If it is odd, it will assign the redMarker.

Code Summary

Here’s the complete code snippet combining all the elements:

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

Conclusion

With this approach, you can effectively differentiate between markers by color in your React Native application. By leveraging the modulo operator, conditional rendering becomes an effortless task, allowing you to enhance the visual representation of your map features. Experiment with different colors and conditions for more diverse mapping solutions. Happy coding!