cached_image_problems.dart

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
        title: 'CachedNetworkImage Demo',
        theme: ThemeData(primarySwatch: Colors.blue),
        home: MyHomePage(),
      );
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) => Scaffold(
        appBar: AppBar(title: Text('CachedNetworkImage')),
        body: _testContent(),
      );

  _testContent() {
    return SingleChildScrollView(
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            CachedNetworkImage(
              placeholder: (context, url) =>
                  CircleAvatar(radius: 200, backgroundColor: Colors.purple),
              imageBuilder: (context, provider) {
                print('image builder');
                return CircleAvatar(
                  backgroundImage: provider,
                  radius: 200,
                );
              },
              imageUrl:
                  'https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Dr_John_Zoidberg.png/200px-Dr_John_Zoidberg.png',
            ),
          ],
        ),
      ),
    );
  }

}