https://github.com/daohoangson/flutter_widget_from_html/issues/76

main.dart

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

const html = """
<figure>
  <img src="https://media.giphy.com/media/6VoDJzfRjJNbG/giphy-downsized.gif" width="250" height="171" />
  <figcaption>Source: <a href="https://gph.is/QFgPA0">https://gph.is/QFgPA0</a></figcaption>
</figure>
""";

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
        home: Scaffold(
          appBar: AppBar(title: Text('Image.network')),
          body: SingleChildScrollView(
            child: HtmlWidget(
              html,
              factoryBuilder: (hwc) => _MyWidgetFactory(hwc),
            ),
          ),
        ),
      );
}

class _MyWidgetFactory extends WidgetFactory {
  _MyWidgetFactory(HtmlWidgetConfig config) : super(config);

  @override
  Widget buildImageFromUrl(String url) =>
      url?.isNotEmpty == true ? Image.network(url, fit: BoxFit.cover) : null;
}

In v0.2.3+2, the buildImageFromUrl method signature have changed. The sample code must be updated to avoid build error:

  @override
  ImageProvider buildImageFromUrl(String url) =>
      url?.isNotEmpty == true ? NetworkImage(url) : null;