Flutter - Google Maps custom marker icon BitmapDescriptor.asset() is not showing

Question

I'm trying to set a custom marker icon for an app that uses google maps. Right now, the marker icons are suck on the default red pin icon even when I've set them to use a custom png asset.

I load the assets with BitmapDescriptor.asset and it still shows the default icon. This is based off of this answer.

// Assets
late BitmapDescriptor redPin;
late BitmapDescriptor bluePin;

@override
  void initState() {
    WidgetsBinding.instance.addPostFrameCallback((_) async {
      redPin = await BitmapDescriptor.asset(
          const ImageConfiguration(size: Size(55, 55)), AppAssets.pinred);
      bluePin = await BitmapDescriptor.asset(
          const ImageConfiguration(size: Size(55, 55)), AppAssets.pinblue);
      setState(() {});
    });

    super.initState();
  }

where AppAssets.pinRed and AppAssets.pinBlue are equal to assets/icons/pinRed.png and assets/icons/pinBlue.png respectively.

I use the icons like this in the UI:

GoogleMaps(
 ....
 markers: {
    Marker(
      icon: isSelected ? bluePin : redPin
   )
 }
)

and I made sure to include them inside my pubspec.yaml:

flutter:
  uses-material-design: true
  assets:
    - assets/icons/

I notice that if were to put a breakpoint next to where I try to assign the icon inside the Marker declaration, in VSCode the bluePin variable data in the side looks like this:

notice that the _json field is empty. I'm assuming that has something to do with this.

No matter what I try, they are continually stuck on the default red marker when I want my custom ones instead. Why are my custom marker icons not showing up?

A-E · Accepted Answer · 2024-06-10 19:54:38Z

1

Try the following code:

void initState(){
  initiateMarkers();
}

void initiateMarkers()async{
  
  red = await getImage('pass path here');
  blue = await getImage('pass path here');
}

and here's how getImage works:

  Future<BitmapDescriptor> getImage(String assetPath)async{
    final asset = await rootBundle.load(assetPath);
    final icon = BitmapDescriptor.fromBytes(asset.buffer.asUint8List());
    return icon;
  }

answered Jun 10, 2024 at 19:54

A-E

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Comments

zh24 · Accepted Answer · 2024-06-10 21:18:07Z

1

Fixed by updating google_maps_flutter from 2.4.0 to 2.7.0. Newest version works fine

answered Jun 10, 2024 at 21:18

zh24

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1 Comment

aymen Braham Sep 2 at 20:49

i have this version 2.9.0 and doesn't work !!

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