How do I determine the width and height of an image in Flutter?

Question

Assume I have declared my image in my pubspec.yaml like this:

  assets:
    - assets/kitten.jpg

And my Flutter code is this:

Answer 1

The other answers seem overly complicated if you just want the width and height of an image in an async function. You can get the image resolution using flutter lib directly like this:

import 'dart:io';

File image = new File('image.png'); // Or any other way to get a File instance.
var decodedImage = await decodeImageFromList(image.readAsBytesSync());
print(decodedImage.width);
print(decodedImage.height);