1. override
ImageStreamCompleter load(NetworkImage key)

Converts a key into an ImageStreamCompleter, and begins fetching the image.

Source

@override
ImageStreamCompleter load(NetworkImage key) {
  return new OneFrameImageStreamCompleter(
    _loadAsync(key),
    informationCollector: (StringBuffer information) {
      information.writeln('Image provider: $this');
      information.write('Image key: $key');
    }
  );
}