CustomPaint(
      size: Size(double.infinity, 49),
      painter: ContainnerColor(color: Colors.red),
    );

import 'dart:ui';
import 'package:flutter/material.dart';

class ContainnerColor extends CustomPainter {
  ContainnerColor({
    this.color = Colors.red,
  }) {
    _drawPaint = Paint()
      ..color = this.color
      ..isAntiAlias = true
      ..style = PaintingStyle.fill;
  }

  final Color color;
  Paint _drawPaint;

  @override
  void paint(Canvas canvas, Size size) {
    canvas.drawRect(Offset(0, -1) & size, _drawPaint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) => false;
}

import 'package:flutter/material.dart';

import 'image_network_stub.dart'
if (dart.library.html) 'image_network_web.dart'
if (dart.library.io) 'image_network_io.dart';

class ImageNetwork extends StatelessWidget {
  final String src;

  const ImageNetwork({Key key, this.src}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return imageWithUrl(src);
  }
}

import 'package:flutter/widgets.dart';

StatefulWidget imageWithUrl(String src) => Image.network(src);

// ignore: avoid_web_libraries_in_flutter
import 'dart:html';
import 'dart:io' if (dart.library.html) 'dart:ui' as ui;
import 'package:flutter/widgets.dart';

StatefulWidget imageWithUrl(String src) => HtmlElementImage(src: src,);


class HtmlElementImage extends StatefulWidget {
  final String src;

  const HtmlElementImage({Key key, this.src}) : super(key: key);

  @override
  _HtmlElementImageState createState() => _HtmlElementImageState();
}

class _HtmlElementImageState extends State<HtmlElementImage> {
  Widget build(BuildContext context) {
    // ignore: undefined_prefixed_name
    ui.platformViewRegistry.registerViewFactory(
      widget.src,
          (int viewId) => ImageElement()..src = widget.src,
    );
    return HtmlElementView(
      viewType: widget.src,
    );
  }
}

import 'package:flutter/widgets.dart';

StatefulWidget imageWithUrl(String src) => throw UnsupportedError('No implementation for imageWithUrl');

import 'image_network.dart';

Container(
                  width: 100,
                  height: 100,
                  child: ImageNetwork(
                      src: 'https://img.pokemondb.net/artwork/bulbasaur.jpg'),
                ),

    final response = await http.get(_baseUrl);
    return _parseXML(response.body);

    final response = await http.get(_baseUrl);
    return _parseXML(utf8.decode(response.bodyBytes));