效果如图 代码   
 
import 'dart:io';  import 'package:flutter/cupertino.dart'; 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('这是我的FlutterAPP'),           centerTitle: true,           backgroundColor: Colors.red,           textTheme: TextTheme(               title: TextStyle(                   fontSize: 18,                   color: Colors.yellow,                   fontStyle: FontStyle.italic               )           ),          ),          body: HomeText(),       ), //      theme: ThemeData( //          primarySwatch: Colors.blue //      ),     );   } }  class HomeText extends StatelessWidget {   @override   Widget build(BuildContext context) {     return ConstrainedBox(       constraints: BoxConstraints.expand(),       child: Column(         children: <Widget>[           Stack(             alignment: Alignment.bottomCenter,             children: <Widget>[               Container(                 alignment: Alignment.center,                 width: 200,                 height: 100,                 color: Colors.green,                 child: Image.network(                   'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1591175847643&di=6e41a32b6e6355aacbfae14d03439a83&imgtype=0&src=http%3A%2F%2Fimgwx4.2345.com%2Fdypcimg%2Fdongman%2Fimg%2F2%2F25%2Fsup75205_223x310.jpg',                   fit: BoxFit.fill,                   width: 200,                   height: 100,                 ),               ),                Container(                 width:200,                 color: Colors.black,                 child: Text(                   '我最爱看数码宝贝',                   style: TextStyle(                     color: Colors.white,                     fontSize: 16,                   ),                   textAlign: TextAlign.center,                 ),               )             ],           ),           SizedBox(height: 20,),            ClipRRect(             borderRadius: BorderRadius.circular(20),             child: Stack(               alignment: Alignment.bottomCenter,               children: <Widget>[                 Container(                   alignment: Alignment.center,                   width: 200,                   height: 100,                   color: Colors.green,                   child: Image.network(                     'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1591175847643&di=6e41a32b6e6355aacbfae14d03439a83&imgtype=0&src=http%3A%2F%2Fimgwx4.2345.com%2Fdypcimg%2Fdongman%2Fimg%2F2%2F25%2Fsup75205_223x310.jpg',                     fit: BoxFit.fill,                     width: 200,                     height: 100,                   ),                 ),                  Container(                   width: 200,                   color: Colors.black,                   child: Text(                     '我最爱看数码宝贝',                     style: TextStyle(                       color: Colors.white,                       fontSize: 16,                     ),                     textAlign: TextAlign.center,                   ),                 )               ],             ),           ),            SizedBox(height: 20,),            ClipRRect(             borderRadius: BorderRadius.only(               topLeft: Radius.circular(20),               topRight: Radius.circular(20),             ),             child: Stack(               alignment: Alignment.bottomCenter,               children: <Widget>[                 Container(                   alignment: Alignment.center,                   width: 200,                   height: 100,                   color: Colors.green,                   child: Image.network(                     'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1591175847643&di=6e41a32b6e6355aacbfae14d03439a83&imgtype=0&src=http%3A%2F%2Fimgwx4.2345.com%2Fdypcimg%2Fdongman%2Fimg%2F2%2F25%2Fsup75205_223x310.jpg',                     fit: BoxFit.fill,                     width: 200,                     height: 100,                   ),                 ),                  Container(                   width: 200,                   color: Colors.black,                   child: Text(                     '我最爱看数码宝贝',                     style: TextStyle(                       color: Colors.white,                       fontSize: 16,                     ),                     textAlign: TextAlign.center,                   ),                 )               ],             ),           ),          ],       ),     );   } } 
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