how to show loading for image.network in flutter code example

Example: flutter network image show loading indicator

Image.network(
          'https://previews.123rf.com/images/blueringmedia/blueringmedia1701/blueringmedia170100692/69125003-colorful-kite-flying-in-blue-sky-illustration.jpg',
          loadingBuilder: (BuildContext context, Widget child,
              ImageChunkEvent loadingProgress) {
            if (loadingProgress == null) return child;
            return Center(
              child: CircularProgressIndicator(
                value: loadingProgress.expectedTotalBytes != null
                    ? loadingProgress.cumulativeBytesLoaded /
                        loadingProgress.expectedTotalBytes
                    : null,
              ),
            );
          },
        ),