36 Flutter仿京东商城项目 用户登录 退出登录 事件广播更新状态

Login.dart

import 'dart:convert';

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter_jdshop/config/Config.dart';
import 'package:flutter_jdshop/pages/tabs/Tabs.dart';
import 'package:flutter_jdshop/services/ScreenAdapter.dart';
import 'package:flutter_jdshop/services/Storage.dart';
import 'package:flutter_jdshop/widget/JdButton.dart';
import 'package:fluttertoast/fluttertoast.dart';
import '../widget/JdText.dart';
import '../widget/JdText.dart';

import '../services/EventBus.dart';

class LoginPage extends StatefulWidget {
  LoginPage({Key key}) : super(key: key);

  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  //监听登录页面销毁的事件：
  dispose(){
    super.dispose();
    eventBus.fire(new UserEvent("登录成功..."));
  }


  String username = "";
  String password = '';
  doLogin() async {
    RegExp reg = new RegExp(r"^1d{10}$");
    if (!reg.hasMatch(this.username)) {
      Fluttertoast.showToast(
          msg: "手机号格式不正确",
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER);
    } else if (password.length < 6) {
      Fluttertoast.showToast(
          msg: "密码不正确",
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER);
    } else {
      var api = "${Config.domain}api/doLogin";
      var response = await Dio().post(api,
          data: {"username": this.username, "password": this.password});
      if (response.data["success"]) {
        print(response);
        //保存信息，
        Storage.setString('userInfo',json.encode(response.data["userinfo"]));
       Navigator.pop(context);
      } else {
        Fluttertoast.showToast(
          msg: "${response.data["message"]}",
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER,
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.close),
          onPressed: () {
            Navigator.pop(context);
          },
        ),
        title: Text('登录页面'),
        actions: <Widget>[
          FlatButton(
            child: Text('客服'),
            onPressed: () {},
          )
        ],
      ),
      body: Container(
        padding: EdgeInsets.all(ScreenAdapter.width(20)),
        child: ListView(
          children: <Widget>[
            Center(
              child: Container(
                margin: EdgeInsets.only(top: 30),
                height: ScreenAdapter.width(160),
                 ScreenAdapter.width(160),
                child: Image.asset('images/login.png',fit: BoxFit.cover),
                // child: Image.network(
                //     'https://www.iting.com/images/flutter/list5.jpg'),
              ),
            ),
            JdText(
              text: "请输入用户名",
              onChanged: (value) {
                print(value);
                this.username = value;
              },
            ),
            SizedBox(height: 20),
            JdText(
              text: "请输入密码",
              password: true,
              onChanged: (value) {
                print(value);
                this.password = value;
              },
            ),
            SizedBox(height: 20),
            Container(
              padding: EdgeInsets.all(ScreenAdapter.width(20)),
              child: Stack(
                children: <Widget>[
                  Align(
                    alignment: Alignment.centerLeft,
                    child: Text("忘记密码"),
                  ),
                  Align(
                    alignment: Alignment.centerRight,
                    child: InkWell(
                      onTap: () {
                        Navigator.pushNamed(context, '/RegisterFirst');
                      },
                      child: Text("新用户注册"),
                    ),
                  )
                ],
              ),
            ),
            SizedBox(height: 20),
            JdButton(
              text: "登录",
              color: Colors.red,
              cb: doLogin,
            )
          ],
        ),
      ),
    );
  }
}

User.dart

import 'package:flutter/material.dart';
import 'package:flutter_jdshop/services/ScreenAdapter.dart';
import 'package:flutter_jdshop/services/Storage.dart';
import 'package:flutter_jdshop/services/UserServices.dart';
import 'package:flutter_jdshop/widget/JdButton.dart';
import '../../services/EventBus.dart';

class UserPage extends StatefulWidget {
  UserPage({Key key}) : super(key: key);

  _UserPageState createState() => _UserPageState();
}

class _UserPageState extends State<UserPage> {
  bool isLogin = false;
  List userInfo = [];
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    this._getUserinfo();
    //监听登录页面改变的事件：
    eventBus.on<UserEvent>().listen((event) {
      print(event.str);
      this._getUserinfo();
    });
  }

  _getUserinfo() async {
    var isLogin = await UserServices.getUserLoginState();
    var userInfo = await UserServices.getUserInfo();
    print(userInfo);
    print(isLogin);
    setState(() {
      this.userInfo = userInfo;
      this.isLogin = isLogin;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("用户中心"),
      ),
      body: ListView(
        children: <Widget>[
          Container(
            height: ScreenAdapter.height(220),
             double.infinity,
            decoration: BoxDecoration(
                image: DecorationImage(
                    image: AssetImage('images/user_bg.jpg'),
                    fit: BoxFit.cover)),
            child: Row(
              children: <Widget>[
                Container(
                  margin: EdgeInsets.fromLTRB(10, 0, 10, 0),
                  child: ClipOval(
                    child: Image.asset(
                      'images/user.png',
                      fit: BoxFit.cover,
                       ScreenAdapter.width(100),
                      height: ScreenAdapter.width(100),
                    ),
                  ),
                ),
                !this.isLogin
                    ? Expanded(
                        flex: 1,
                        child: InkWell(
                          onTap: () {
                            Navigator.pushNamed(context, '/login');
                          },
                          child: Text('登录/注册',
                              style: TextStyle(color: Colors.white)),
                        ),
                      )
                    : Expanded(
                        flex: 1,
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: <Widget>[
                            Text("用户名:${this.userInfo[0]["username"]}",
                                style: TextStyle(
                                    color: Colors.white,
                                    fontSize: ScreenAdapter.size(32))),
                            Text("普通会员",
                                style: TextStyle(
                                    color: Colors.white,
                                    fontSize: ScreenAdapter.size(32)))
                          ],
                        ),
                      ),
              ],
            ),
          ),
          ListTile(
              leading: Icon(Icons.home, color: Colors.red), title: Text('首页')),
          Divider(),
          ListTile(leading: Icon(Icons.home), title: Text('首页')),
          ListTile(leading: Icon(Icons.home), title: Text('首页')),
          ListTile(leading: Icon(Icons.home), title: Text('首页')),
          this.isLogin
              ? Container(
                padding: EdgeInsets.all(20),
                  child: JdButton(
                    color: Colors.red,
                    text: "退出登录",
                    cb: () {
                      UserServices.loginOut();
                      this._getUserinfo();
                    },
                  ),
                )
              : Text("")
        ],
      ),
    );
  }
}

EventBus.dart

import 'package:event_bus/event_bus.dart';


//Bus 初始化 

EventBus eventBus = EventBus();
//商品详情广播数据：
class ProductContentEvent{
  String str;
  ProductContentEvent(String str){
    this.str=str;
  }
}

//用户中心广播：
class UserEvent{
  String str;
  UserEvent(String str){
    this.str=str;
  }
}

UserServices.dart

import 'dart:convert';

import '../services/Storage.dart';

class UserServices {
  static getUserInfo() async {
    List userinfo;
    try {
      List userInfoData = json.decode(await Storage.getString("userInfo"));
      userinfo = userInfoData;
    } catch (e) {
      userinfo = [];
    }
    return userinfo;
  }

  static getUserLoginState() async{
    var userInfo =await UserServices.getUserInfo();
    if (userInfo.length > 0 && userInfo[0]['username'] != "") {
      return true;
    }
    return false;
  }

  static loginOut() {
    Storage.remove("userInfo");
  }
}

RegisterThird.dart

import 'dart:convert';

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter_jdshop/config/Config.dart';
import 'package:flutter_jdshop/widget/JdButton.dart';
import 'package:flutter_jdshop/widget/JdText.dart';
import 'package:fluttertoast/fluttertoast.dart';
import '../services/Storage.dart';

//引入Tabs:
import '../pages/tabs/Tabs.dart';
class RegisterThirdPage extends StatefulWidget {
  Map arguments;
  RegisterThirdPage({Key key, this.arguments}) : super(key: key);

  _RegisterThirdPageState createState() => _RegisterThirdPageState();
}

class _RegisterThirdPageState extends State<RegisterThirdPage> {
  String tel;
  String code;
  String password='';
  String rpassword='';
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    this.tel = widget.arguments["tel"];
    this.code = widget.arguments["code"];
  }

  //注册：
  doRegister() async {
    if (password.length < 6) {
      Fluttertoast.showToast(
        msg: "密码长度不能小于6位",
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
      );
    } else if (password != rpassword) {
        Fluttertoast.showToast(
          msg: "密码和确认密码不一致",
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER,
        );
    }else{
       var api = '${Config.domain}api/register';
      var responses = await Dio().post(api, data: {
        "tel": this.tel,
        "code": this.code,
        "password": this.password
      });
      if (responses.data["success"]) {
        //保存信息，
        Storage.setString('userInfo',json.encode(responses.data['userinfo']) );
        //返回到根：
        Navigator.of(context).pushAndRemoveUntil(
          new MaterialPageRoute(builder: (context)=>new Tabs()),
          (route)=>route==null);
      } else {
        Fluttertoast.showToast(
          msg: "${responses.data["message"]}",
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER,
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('用户注册-第三步'),
      ),
      body: Container(
        padding: EdgeInsets.all(20),
        child: ListView(
          children: <Widget>[
            SizedBox(height: 10),
            JdText(
              text: "请输入密码",
              password: true,
              onChanged: (value) {
                this.password=value;
                print(value);
              },
            ),
            SizedBox(height: 10),
            JdText(
              text: "请输入确认密码",
              password: true,
              onChanged: (value) {
                this.rpassword=value;
                print(value);
              },
            ),
            SizedBox(height: 10),
            JdButton(
              text: "注册",
              color: Colors.red,
              cb: doRegister,
            )
          ],
        ),
      ),
    );
  }
}
//