flutter google maps custom marker
import 'dart:typed_data';
import 'dart:ui';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
class MarkerInfo extends StatefulWidget {
final Function getBitmapImage;
final String text;
MarkerInfo({Key key, this.getBitmapImage, this.text}) : super(key: key);
@override
_MarkerInfoState createState() => _MarkerInfoState();
}
class _MarkerInfoState extends State<MarkerInfo> {
final markerKey = GlobalKey();
void initState() {
super.initState();
WidgetsBinding.instance.addPostFrameCallback((_) => getUint8List(markerKey)
.then((markerBitmap) => widget.getBitmapImage(markerBitmap)));
}
Future<Uint8List> getUint8List(GlobalKey markerKey) async {
RenderRepaintBoundary boundary =
markerKey.currentContext.findRenderObject();
var image = await boundary.toImage(pixelRatio: 2.0);
ByteData byteData = await image.toByteData(format: ImageByteFormat.png);
return byteData.buffer.asUint8List();
}
@override
Widget build(BuildContext context) {
return RepaintBoundary(
key: markerKey,
child: Container(
padding: EdgeInsets.only(bottom: 29),
child: Container(
width: 100,
height: 100,
color: Color(0xFF000000),
child: Text(
widget.text,
style: TextStyle(
color: Color(0xFFFFFFFF),
),
),
),
),
);
}
}
