Flutter Image Widget:如何将Image小部件转换为Byte数组

import 'dart:typed_data';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';

GlobalKey imageKey = GlobalKey();

RepaintBoundary(
  key: imageKey,
  child: Image.network('https://example.com/image.jpg'),
)

Future<Uint8List> imageToByte() async {
  RenderRepaintBoundary boundary = imageKey.currentContext.findRenderObject();
  ui.Image image = await boundary.toImage(pixelRatio: 1.0);
  ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);
  return byteData.buffer.asUint8List();
}

Uint8List byteData = await imageToByte();