getArtworkImage method
Returns the album cover if it has already been downloaded.
Implementation
Future<Image?> getArtworkImage() async {
final byteData = await _metadataArtworkChannel.send(ByteData(0));
Image? image;
if (byteData != null)
image = Image.memory(byteData.buffer.asUint8List(),
key: UniqueKey(), fit: BoxFit.cover);
return image;
}