setPictureSize method
set the size of the picture
Implementation
Future<void> setPictureSize(int width, int height) async {
// TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
var x = await channel.invokeMethod(
'setPictureSize', {"pictureWidth": width, "pictureHeight": height});
print("setPictureSize => $x");
}