image_network_error_handling.dart

class _MyHomePageState extends State<MyHomePage> {
  final String myImageUrl =
      "https://images.unsplash.com/photo-1485841890310-6a055c88698a?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80"; // <- defines the url path of our image

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      body: Container(
        color: Colors.red,
        child: Center(
          child: Image.network(myImageUrl,
              semanticLabel: "This is an image of a row of plants", // <- A description of the image for voice  applications.
              errorBuilder: (BuildContext context, Object exception,
                  StackTrace stackTrace) {
            return Text(
              'Sorry, cannot load image', // <- What we show when image fails to load
              style: TextStyle(color: Colors.white, fontSize: 30),  // <- Styling for default text 
            );
          }),
        ),
      ),
    );
  }
}