在此示例中，我将分享如何在google_maps_flutter Flutter插件中使用SVG标记。首先，创建一个函数，该函数将为您提供资产中的BitmapDescriptor。确保在pubspec文件中声明了资产。
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import ‘dart:ui’ as ui;
import ‘package:flutter/services.dart’;
import ‘package:flutter_svg/flutter_svg.dart’;
Future<BitmapDescriptor> _bitmapDescriptorFromSvgAsset(BuildContext context, String assetName) async {
String svgString = await DefaultAssetBundle.of(context).loadString(assetName);
//Draws string representation of svg to DrawableRoot
DrawableRoot svgDrawableRoot = await svg.fromSvgString(svgString, null);
ui.Picture picture = svgDrawableRoot.toPicture();
ui.Image image = await picture.toImage(26, 37);
ByteData bytes = await image.toByteData(format: ui.ImageByteFormat.png);
return BitmapDescriptor.fromBytes(bytes.buffer.asUint8List());
}
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我在应用程序的开头实例化了一个Map对象，这样我就可以使用BitmapDescriptors而不用使用很多异步/等待调用。
data_model.dart
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Map<CategoryType, BitmapDescriptor> descriptors = Map<Category, BitmapDescriptor>();
Future<void> loadBitmapDescriptors(context) async {
descriptors[CategoryType.FirstCatgory] = await _bitmapDescriptorFromSvgAsset(context, ‘assets/markers/marker-first.svg’);
descriptors[CategoryType.SecondCategory] = await _bitmapDescriptorFromSvgAsset(context, ‘assets/markers/marker-second.svg’);
descriptors[CategoryType.ThirdCategory] = await _bitmapDescriptorFromSvgAsset(context, ‘assets/markers/marker-third.svg’);
}
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DataModel.of(context).loadBitmapDescriptors(context);
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