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效果图：

 

 代码：

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter 网络图片'),
        ),
        body: Container(
          padding: EdgeInsets.all(10.0),
          child: ClipRRect(
            borderRadius: BorderRadius.circular(10),
            child: Image.network(
              'https://img2018.cnblogs.com/i-beta/1383776/202001/1383776-20200117095609236-1518371407.png'
            ),
          ),
        )
      ),
    );
  }
}