How to make FadeInImage Circular?

Set the width and height property of FadeInImage and it should work.

ClipOval(
  child: CachedNetworkImage(
      fit: BoxFit.cover,
      width: 50,
      height: 50,
      placeholder: AssetImage("images/alex.jpg"),
      imageUrl:"https://cdn1.thr.com/sites/default/files/imagecache/scale_crop_768_433/2018/02/gettyimages-862145286_copy_-_h_2018.jpg",
  ),
)

I created a custom widget for this:

import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';

class CircleCachedNetworkAvatar extends StatelessWidget {
  final String url;
  final double size;

  CircleCachedNetworkAvatar({@required this.url, this.size = 50.0});

  @override
  Widget build(BuildContext context) {
    return Container(
        height: size,
        width: size,
        child: url != null
            ? ClipOval(
                child: CachedNetworkImage(
                  fadeInDuration: const Duration(seconds: 0),
                  fadeOutDuration: const Duration(seconds: 0),
                  imageUrl: url,
                  placeholder: Container(
                      color: Colors.greenAccent, child: Icon(Icons.person)),
                  fit: BoxFit.cover,
                ),
              )
            : CircleAvatar(
                backgroundColor: Colors.greenAccent,
                child: Icon(Icons.person)));
  }
}

What do you think about this code?

Wrap FadeInImage widget with ClipOval then wrao ClipOval widget with AspectRatio:

AspectRatio(
      aspectRatio: 1/1,
      child: ClipOval(
        child: FadeInImage.assetNetwork(
            fit: BoxFit.cover,
            placeholder: "Your-placeholder-path",
            image: "Your-Image-Url"),
      ),
    );