flutter - 如何确定缓存网络图像的宽度和高度？

Question

有没有办法获得 CachedNetworkImage 的高度。我找到了 this获取常规网络图像高度的解决方案。有没有办法为缓存的图像实现这个？

Answer 1

对现有的解决方案稍作修改 https://stackoverflow.com/a/57640169/5882307工作。

代码:

  Future<Size> _calculateImageDimension() {
  Completer<Size> completer = Completer();
  Image image = new Image(image: CachedNetworkImageProvider("/image/lkd0a.png")); // I modified this line
  image.image.resolve(ImageConfiguration()).addListener(
    ImageStreamListener(
      (ImageInfo image, bool synchronousCall) {
        var myImage = image.image;
        Size size = Size(myImage.width.toDouble(), myImage.height.toDouble());
        completer.complete(size);
      },
    ),
  );
  return completer.future;
}

用作:

_calculateImageDimension().then((size) => print("size = ${size}")); // 487.0,696.0

所有应得的感谢原作者: https://stackoverflow.com/a/57640169/5882307