FlutterProjectDessertDetails.dart

import 'package:flutter/material.dart';

import 'DessertList.dart';

Dessert dessert;

class DessertDetails extends StatelessWidget {
  static final routeName = '/DessertDetails';

  @override
  Widget build(BuildContext context) {
    /// you should call this in the main widget the one that has a Material App
    /// to get the passed arguments
    dessert = ModalRoute.of(context).settings.arguments;

    print(dessert);

    return MaterialApp(
      home: MyApp(),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Container(
        color: Colors.blue,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            Image.network(
              '${dessert.imgUrl}',
              fit: BoxFit.cover,
            ),
            Padding(
              padding: const EdgeInsets.all(16.0),
              child: Text(
                '${dessert?.name}',
                style: TextStyle(fontSize: 50, fontWeight: FontWeight.w900),
              ),
            ),
          ],
        ),
      ),
    );
  }
}