显示一种网络图片

import 'package:flutter/material.dart';
main(){runApp(MaterialApp(theme: ThemeData.dark(),home:Home(),));}class Home extends StatelessWidget{@overrideWidget build(BuildContext context) {// TODO: implement buildreturn Scaffold(appBar:AppBar(title: Text("python"),centerTitle: true ,backgroundColor:Colors.red,),body: Image.network('https://pic2.zhimg.com/50/v2-060cd30fd5251c238ce5be1f9baa3741_hd.jpg?source=1940ef5c',height: 120,width: 120,fit: BoxFit.cover));}}

 GestureDetector(首饰探测器)

import 'package:flutter/material.dart';
main(){runApp(MaterialApp(theme:ThemeData.dark(),home:Home(),));}class Home extends StatefulWidget{@override_HomeState  createState()=>_HomeState();}class _HomeState extends State<Home>{var count=0;@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(backgroundColor: Color(0xFFFF0000),title:Text("这是一个标题") ,),body: GestureDetector(child:Text('ddd',style:TextStyle(fontSize: 50),),onTap: (){print('您点击了一次');},));}
}

给按钮设置点击事件

import 'package:flutter/material.dart';
main(){runApp(MaterialApp(theme:ThemeData.dark(),home:Home(),));}class Home extends StatefulWidget{@override_HomeState  createState()=>_HomeState();}class _HomeState extends State<Home>{var c1=TextEditingController();var count=0;@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(backgroundColor: Color(0xFFFF0000),title:Text("这是一个标题") ,),body: Column(children: [TextField(controller: c1,),ElevatedButton(onPressed:(){print(c1.text);}, child:Text('click'))],),);}
}