1. 有狀態widget：StatefulWidget和無狀態widget：StatelessWidget 前者不需要實現Widget build(BuildContext context)。

   具體的選擇取決于widget是否需要管理一些狀態

2. 在Dart語言中使用下劃線前綴標識符，會強制其變成私有的。

3. Icons.favorite Icons類里面有很多默認圖標

4. isOdd 是否奇數 2.isOdd -> false 1.isOdd -> true

5. pushSaved “”開頭的自動轉成私有（方法和變量）

6. 導航欄添加按鈕和事件

 @overrideWidget build(BuildContext context) {return new Scaffold(appBar: new AppBar(title: new Text('Startup Name Generator'),actions: <Widget>[// AppBar 添加一個按鈕 樣式為list 事件是_pushSavednew IconButton(icon: new Icon(Icons.list), onPressed: _pushSaved)],),body: _buildSuggestions(),);}// tooltip 長時間按下的提示文字IconButton(icon: new Icon(Icons.search), tooltip: 'Search', onPressed: null)

7. 界面跳轉方法

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

8. 一行函數寫法

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

9. // Material 是UI呈現的“一張紙”

10. 請確保在pubspec.yaml文件中，將flutter的值設置為：uses-material-design: true。這允許我們可以使用一組預定義Material icons。

11. Row（橫向排列）和Column（縱向排列）

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

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

12. cached_network_image 圖片占位和淡入淡出

13. push

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

14. dio網絡請求https://github.com/flutterchina/dio

15. import 'dart:convert'; // package將響應內容轉化為一個json Map

16. // 使用fromJson工廠函數，將json Map 轉化為一個Post對象

new Post.fromJson(json); 

17. future參數是一個異步的網絡請求

18. import 'dart:io'; // 添加請求的headers

19. // 長連接

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

20. // 網絡請求

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);}// 請求添加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();}) 

21. 長連接

// 連接長連接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));})// 發送消息widget.channel.sink.add(_textController.text);// 關閉長連接widget.channel.sink.close(); 

22. 在Flutter中添加資源和圖片

https://flutterchina.club/assets-and-images/

24. 標準widget：

Container添加 padding, margins, borders, background color, 或將其他裝飾添加到widget.GridView將 widgets 排列為可滾動的網格.ListView將widget排列為可滾動列表Stack將widget重疊在另一個widget之上.Material Components：Card將相關內容放到帶圓角和投影的盒子中。ListTile將最多3行文字，以及可選的行前和和行尾的圖標排成一行 

25. pubspec.yaml中添加字體 注意縮進對齊 注意縮進對齊 注意縮進對齊

-asset 路徑是與pubspec.yaml平級的文件路徑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 

26. 比如一個關閉按鈕在

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

27. 分割線

new Divider(color: Colors.lightBlue,)

28. 自定義Icon

new Image.asset(“圖片路徑", width: 20.0, height: 20.0,) 

29. 按鈕寬高

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: (){},//設置控件的高度child: new Padding(padding: new EdgeInsets.fromLTRB(0.0, 10.0, 0.0, 10.0),child: new Text("登錄",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: (){},//設置控件的高度child: new Padding(padding: new EdgeInsets.fromLTRB(0.0, 10.0, 0.0, 10.0),child: new Text("登錄",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,),);} 

30. 設備尺寸

MediaQuery.of(context).size.width 

31. 設備像素密度

MediaQuery.of(context).devicePixelRatio 

32. 狀態欄高度

MediaQuery.of(context).padding.top 

33. 擔心鍵盤擋住控件，可以使用 SingleChildScrollView，將SingleChildScrollView當做容器。

34. 一個超級簡單界面

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),);}} 

35. Flutter 按鈕總結

· InkWell // 純文字按鈕· OutLineButton // 邊框按鈕· IconButton// icon按鈕·

36. import 'package:flutter/services.dart';

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

37. 以上已經添加

38. 驗證碼按鈕

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: () {},),)), 

39. 倒計時方法

@overridevoid dispose() {super.dispose();_cancelTimer();}_startTimer() {if (_verifyStr == '重新發送' || _verifyStr == '獲取驗證碼') {_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 = '重新發送';}});}}_cancelTimer() {_timer?.cancel();} 

40. 富文本拼接： 協議

Widget _protocolWidget() {return new Container(child: new Row(children: <Widget>[new GestureDetector(onTap: () {print("選擇");},child: Icon(Icons.add_alert, color: Colors.white),),new Text.rich(new TextSpan(text: '我已閱讀并同意',style: new TextStyle(fontSize: 12.0,color: Colors.grey[500],fontWeight: FontWeight.w400,),children: [new TextSpan(recognizer: new TapGestureRecognizer()..onTap = () {print("《燎原用戶服務協議》");},text: "《燎原用戶服務協議》",style: new TextStyle(fontSize: 14.0,color: Color(0XFFB57A36),fontWeight: FontWeight.w400,),)])),],));} 

41. 陰影、圓角

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: () {}),) 

42. YYTabbarWidget

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,),),);}} 

43. ListView 添加刷新，當數量少的時候不能滾動

physics: new AlwaysScrollableScrollPhysics(), // 讓ListView一直可以滾動 

44. tabView切換 子界面都會調用initState

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

45. 路有跳轉

///不帶參數的路由表跳轉Navigator.pushNamed(context,routeName);///跳轉新頁面并且替換，比如登錄頁跳轉主頁Navigator.pushReplacementNamed(context,routeName);///跳轉到新的路由，并且關閉給定路由的之前的所有頁面Navigator.pushNamedAndRemoveUntil(context,'/calendar',ModalRoute.withName('/'));///帶參數的路由跳轉，并且監聽返回Navigator.push(context,newMaterialPageRoute(builder:(context)=>newNotifyPage())).then((res){///獲取返回處理}); 

46. flutter lib

cupertino_icons: ^0.1.2#iconflutter_spinkit: "^2.1.0"# load more loadingimport 'package:flutter_spinkit/flutter_spinkit.dart';dio: x.x.x#無網絡請求import 'package:dio/dio.dart'; 

47. dio網絡請求示例

_dioRequest() async {Dio dio = new Dio();Response response;try {String url;var params; // 請求參數Options options; // 配置：超時，請求頭，請求類型等response = await dio.request(url, data: params, options: options);} on DioError catch(e) {// 請求出錯時，返回一個DioError對象}} 

48. build_runner的使用

1、在根目錄運行2、一次性創建.g.dart文件 使用build 此時目錄內不能有.g.dart文件3、watch是監聽 有model類的文件創建 自動創建.g.dart文件flutter packages pub run build_runner buildflutter packages pub run build_runner watch 

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