Flutter里StatefulWidge组件的含义为 有状态的组件类,StatelessWidget为无状态的组件,这篇只说StatelessWidget
效果图
图示中 就是一个简单的弹窗和一个点击后的吐司以及背景的渐变,没有做过多的介绍,因为StatelessWidget比较StatefulWidget 还是相对容易些
贴一下代码
吐司用的是一个依赖库 fluttertoast: ^4.0.1 需要看效果的可以添加一下这个依赖库
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:fluttertoast/fluttertoast.dart';
class StateLessLearn extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter stateless学习',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(title: Text('Flutter stateless学习'),),
body: Container(
decoration: BoxDecoration(
color: Colors.blueGrey,
gradient: LinearGradient(
colors: [Colors.blueGrey,Colors.black]
)
),
/**
* 内容
*/
child: Column(
verticalDirection: VerticalDirection.down,
children: [
AlertDialog(
title: Text("弹窗"),
backgroundColor: Colors.amber,
content: Text("这是我的第一个弹窗"),
actions: [
FlatButton(
onPressed: () {
},
child: Text('确定')),
FlatButton(
onPressed: () {
Fluttertoast.showToast(
msg: "我来了flutter",
gravity: ToastGravity.CENTER,
toastLength: Toast.LENGTH_LONG,
);
},
child: Text('取消')),
],
)
],
),
),
),
);
}
}