Round CachedNetworkImage in Flutter

You can use the imageBuilder of the CachedNetworkImage:

CachedNetworkImage(
    imageUrl: imageUrl,
    imageBuilder: (context, imageProvider) => Container(
        height: 100,
        width: 100,
        decoration: BoxDecoration(
            borderRadius: BorderRadius.all(Radius.circular(50)),
            image: DecorationImage(
                image: imageProvider,
                fit: BoxFit.cover,
            ),
        ),
    ),
    placeholder: (context, url) => placeholder,
    errorWidget: (context, url, error) => errorWidget,
)

In order to have a rounded image, set the width and height to the same value and set the borderRadius to half the height.

You can use

ClipRRect(borderRadius: BorderRadius.circular(10000.0),
child: CachedNetworkImage(...))

Since CachedNetworkImageProvider is not a Widget, it doesn't work in place of a CachedNetworkImage. Meaning it won't have the placeholder widget option.

You can use the CachedNetworkImageProvider like this:

new Container(
    width: 80.0,
    height: 80.0,
    decoration: new BoxDecoration(
        shape: BoxShape.circle,
        image: new DecorationImage(
            fit: BoxFit.fill,
            image: new CachedNetworkImageProvider(widget.profile_picture),
            ),
          ),
        ),