嘿，你可以像这样插入图片

import 'package:arcore_flutter_plugin/arcore_flutter_plugin.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(HelloWorld());
}

class HelloWorld extends StatefulWidget {
  @override
  _HelloWorldState createState() => _HelloWorldState();
}

class _HelloWorldState extends State<HelloWorld> {
  late ArCoreController arCoreController;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Hello World'),
        ),
        body: ArCoreView(
          onArCoreViewCreated: _onArCoreViewCreated,
        ),
      ),
    );
  }

  void _onArCoreViewCreated(ArCoreController controller) {
    arCoreController = controller;
    _addImage(arCoreController);
  }

  Future<Uint8List> getImageBytes(String imageName) async {
    final ByteData data = await rootBundle.load('assets/$imageName');
    return data.buffer.asUint8List();
  }

  void _addImage(ArCoreController controller) async {
    final imagebytes = await getImageBytes("harry.png");
    final node = ArCoreNode(
      image:ArCoreImage(bytes:imagebytes,width:50,height:50),
      position: vector.Vector3(-0.5, 0.5, -3.5),
    );
    controller.addArCoreNode(node);
  }

  @override
  void dispose() {
    arCoreController.dispose();
    super.dispose();
  }
}