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{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return 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;
  @override
  Widget 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;
  @override
  Widget 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'))
        ],),
      );
    }
}