• 有状态widget：StatefulWidget和无状态widget：StatelessWidget 前者不需要实现Widget build(BuildContext context)。

  具体的选择取决于widget是否需要管理一些状态

• 在Dart语言中使用下划线前缀标识符，会强制其变成私有的。

• Icons.favorite Icons类里面有很多默认图标

• isOdd 是否奇数 2.isOdd -> false 1.isOdd -> true

• pushSaved “”开头的自动转成私有（方法和变量）

• 导航栏添加按钮和事件

     @overrideWidget build(BuildContext context) {return new Scaffold(appBar: new AppBar(title: new Text('Startup Name Generator'),actions: <Widget>[// AppBar 添加一个按钮 样式为list 事件是_pushSavednew IconButton(icon: new Icon(Icons.list), onPressed: _pushSaved)],),body: _buildSuggestions(),);}// tooltip 长时间按下的提示文字IconButton(icon: new Icon(Icons.search), tooltip: 'Search', onPressed: null)

    Navigator.of(context).push(new MaterialPageRoute(builder: (context) {},),);

    // 多行void main() {runApp(new Center(child: new Text('Hello, world!',textDirection: TextDirection.ltr,),))}// 一行void main() => runApp(new MyApp());

    child: new Row(children: <Widget>[new ...,new ...,new ...,],)

    child: new Column(children: <Widget>[new ...,new ...,new ...,],),

    Navigator.push(context,new MaterialPageRoute(builder: (context) => new 新界面),);// 如果需要传值：新界面({Key key, @required this.接收字段的名字}) : super(key: key);popNavigator.pop(context);

new Post.fromJson(json);

import 'package:web_socket_channel/io.dart';import 'package:multi_server_socket/multi_server_socket.dart';

Future<Post> fetchPost() async {final response = await http.get('[http://jsonplaceholder.typicode.com/posts/1](http://jsonplaceholder.typicode.com/posts/1)');final responseJson = json.decode(response.body);return new Post.fromJson(responseJson);}// 请求添加headers/*Future<Post> fetchPost() async {final response = await http.get('[https://jsonplaceholder.typicode.com/posts/1](https://jsonplaceholder.typicode.com/posts/1)',headers: {HttpHeaders.AUTHORIZATION: "Basic your_api_token_here"},);final json = jsonDecode(response.body);return new Post.fromJson(json);}*/new FutureBuilder<Post>(future: fetchPost(),builder: (context, snapshot) {return new CircularProgressIndicator();})

// 连接长连接IOWebSocketChannel.connect('[ws://echo](ws://echo/).[websocket.org](http://websocket.org/)’)// 接收消息new StreamBuilder(stream: widget.channel.stream,builder: (context, snapshot) {return new Padding(child: new Text(snapshot.hasData ? '${snapshot.data}' : ''),padding: const EdgeInsets.symmetric(vertical: 20.0));})// 发送消息widget.channel.sink.add(_textController.text);// 关闭长连接widget.channel.sink.close();

Container添加 padding, margins, borders, background color, 或将其他装饰添加到widget.GridView将 widgets 排列为可滚动的网格.ListView将widget排列为可滚动列表Stack将widget重叠在另一个widget之上.Material Components：Card将相关内容放到带圆角和投影的盒子中。ListTile将最多3行文字，以及可选的行前和和行尾的图标排成一行

-asset 路径是与pubspec.yaml平级的文件路径flutter:# Include the Material Design fonts.uses-material-design: truefonts:- family: Rock Saltfonts:# [https://fonts.google.com/specimen/Rock+Salt](https://fonts.google.com/specimen/Rock+Salt)- asset: fonts/Arial-Unicode.ttf- family: VT323fonts:# [https://fonts.google.com/specimen/VT323](https://fonts.google.com/specimen/VT323)- asset: fonts/Arial-Unicode.ttf- family: Ewertfonts:# [https://fonts.google.com/specimen/Ewert](https://fonts.google.com/specimen/Ewert)- asset: fonts/Ewert-Regular.ttf

new Row(mainAxisAlignment: MainAxisAlignment.end, children: <Widget>[new FlatButton(onPressed: () {}, child: Icon(Icons.close))],);

001、new Padding(padding: new EdgeInsets.fromLTRB(48.0, 20.0, 48.0, 20.0),child: new Row(children: <Widget>[new Expanded(child:new RaisedButton(onPressed: (){},//设置控件的高度child: new Padding(padding: new EdgeInsets.fromLTRB(0.0, 10.0, 0.0, 10.0),child: new Text("登录",style: TextStyle(color: Colors.white)),),color: Colors.brown,),),],),),002、new Container(width: MediaQuery.of(context).size.width - 48 * 2 ,padding: new EdgeInsets.only(top: 40.0),child: new RaisedButton(onPressed: (){},//设置控件的高度child: new Padding(padding: new EdgeInsets.fromLTRB(0.0, 10.0, 0.0, 10.0),child: new Text("登录",style: TextStyle(color: Colors.white)),),color: Colors.brown,),),003、Widget _bigButton(String text, double lSpace, double rSpace) {return new Container(width: MediaQuery.of(context).size.width - lSpace - rSpace,height: 48.0,margin: new EdgeInsets.only(left: lSpace, right: rSpace),color: Colors.white54,padding: new EdgeInsets.only(top: 0.0),child: new RaisedButton(onPressed: (){print(text);},child: new Padding(padding: new EdgeInsets.fromLTRB(0.0, 0.0, 0.0, 0.0),child: new Text(text,style: TextStyle(color: Colors.white)),),color: Colors.brown,),);}

MediaQuery.of(context).size.width

MediaQuery.of(context).devicePixelRatio

MediaQuery.of(context).padding.top

import 'package:flutter/material.dart';class RegisterPage extends StatelessWidget {@overrideWidget build(BuildContext context) {return new Scaffold(backgroundColor: Colors.black,body: new RegisterWidget(),);}}class RegisterWidget extends StatefulWidget {RegisterWidgetState createState() => RegisterWidgetState();}class RegisterWidgetState extends State<RegisterWidget> {@overrideWidget build(BuildContext context) {return new Text("RegisterPage", style: TextStyle(color: Colors.white),);}}

· InkWell   // 纯文字按钮· OutLineButton   // 边框按钮· IconButton  // icon按钮·

TextFieldinputFormatters: <TextInputFormatter> [WhitelistingTextInputFormatter.digitsOnly,],

new Positioned(child: new Container(width: 80.0,height: 27.0,alignment: Alignment.center,decoration: new BoxDecoration(border: new Border.all(color: Colors.white,width: 1.0,),borderRadius: new BorderRadius.circular(4.0),),child: InkWell(child: _mText(_verifyStr, 12.0),onTap: () {},),)),

@overridevoid dispose() {super.dispose();_cancelTimer();}_startTimer() {if (_verifyStr == '重新发送' || _verifyStr == '获取验证码') {_seconds = 5;_timer = new Timer.periodic(new Duration(seconds: 1), (timer) {if (_seconds == 0) {_cancelTimer();return;}_seconds--;_verifyStr = '$_seconds(s)';setState(() {});if (_seconds == 0) {_verifyStr = '重新发送';}});}}_cancelTimer() {_timer?.cancel();}

Widget _protocolWidget() {return new Container(child: new Row(children: <Widget>[new GestureDetector(onTap: () {print("选择");},child: Icon(Icons.add_alert, color: Colors.white),),new Text.rich(new TextSpan(text: '我已阅读并同意',style: new TextStyle(fontSize: 12.0,color: Colors.grey[500],fontWeight: FontWeight.w400,),children: [new TextSpan(recognizer: new TapGestureRecognizer()..onTap = () {print("《燎原用户服务协议》");},text: "《燎原用户服务协议》",style: new TextStyle(fontSize: 14.0,color: Color(0XFFB57A36),fontWeight: FontWeight.w400,),)])),],));}

new Card(elevation: 4.0,shape: new RoundedRectangleBorder(borderRadius: BorderRadius.only(topLeft: Radius.circular(16.0),topRight: Radius.circular(16.0),bottomLeft: Radius.circular(12.0),bottomRight: Radius.circular(2.0),)),child: new IconButton(icon: Icon(Icons.add), onPressed: () {}),)

import 'package:flutter/material.dart';// with AutomaticKeepAliveClientMixinclass YYTabbarWidget extends StatefulWidget {List<Widget> tabItems = [];Widget title;List<Widget> tabViews = [];PageController pageController;final ValueChanged<int> onPageChanged;final Widget drawer;YYTabbarWidget({Key key,this.drawer,this.tabItems,this.title,this.tabViews,this.pageController,this.onPageChanged,}) : super(key: key);_YYTabbarWidgetState createState() => _YYTabbarWidgetState(drawer, title, tabItems, tabViews, pageController, onPageChanged);}class _YYTabbarWidgetState extends State<YYTabbarWidget> with SingleTickerProviderStateMixin {final Widget _title;final List<Widget> _tabViews;final List<Widget> _tabItems;final ValueChanged<int> _onPageChanged;final Widget _drawer;_YYTabbarWidgetState(this._drawer,this._title,this._tabItems,this._tabViews,this._pageController,this._onPageChanged,) : super();TabController _tabController;PageController _pageController;@overridevoid initState() {super.initState();_tabController = new TabController(length: _tabItems.length, vsync: this);}@overridevoid dispose() {_tabController.dispose();super.dispose();}_renderTab() {print(_tabItems);List<Widget> list = new List();for (int i = 0; i < _tabItems.length; i++) {list.add(new FlatButton(onPressed: () {print(i);_pageController.jumpTo(MediaQuery.of(context).size.width * i);}, child: _tabItems[I],));}return list;}@overrideWidget build(BuildContext context) {return new Scaffold(drawer: _drawer,appBar: new AppBar(title: _title,),body: new PageView(controller: _pageController,children: _tabViews,onPageChanged: (index) {_tabController.animateTo(index);_onPageChanged?.call(index);},),bottomNavigationBar: new Material(color: Colors.white,child: new TabBar(indicatorPadding: new EdgeInsets.only(top: 0.0),controller: _tabController,tabs: _renderTab(),indicatorColor: Colors.red,),),);}}

physics: new AlwaysScrollableScrollPhysics(), // 让ListView一直可以滚动

解决：AutomaticKeepAliveClientMixinclass HomePageState extends State<HomePage> with AutomaticKeepAliveClientMixin {@overridebool get wantKeepAlive => true;}

///不带参数的路由表跳转Navigator.pushNamed(context,routeName);///跳转新页面并且替换，比如登录页跳转主页Navigator.pushReplacementNamed(context,routeName);///跳转到新的路由，并且关闭给定路由的之前的所有页面Navigator.pushNamedAndRemoveUntil(context,'/calendar',ModalRoute.withName('/'));///带参数的路由跳转，并且监听返回Navigator.push(context,newMaterialPageRoute(builder:(context)=>newNotifyPage())).then((res){///获取返回处理});

cupertino_icons: ^0.1.2  #iconflutter_spinkit: "^2.1.0"  # load more loading  import 'package:flutter_spinkit/flutter_spinkit.dart';dio: x.x.x  #无网络请求  import 'package:dio/dio.dart';

_dioRequest() async {Dio dio = new Dio();Response response;try {String url;var params; // 请求参数Options options; // 配置：超时，请求头，请求类型等response = await dio.request(url, data: params, options: options);} on DioError catch(e) {// 请求出错时，返回一个DioError对象}}

1、在根目录运行2、一次性创建.g.dart文件 使用build 此时目录内不能有.g.dart文件3、watch是监听 有model类的文件创建 自动创建.g.dart文件flutter packages pub run build_runner buildflutter packages pub run build_runner watch