import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:wx_advmanager/common/event/eventbus.dart';
import 'package:wx_advmanager/pages/user/loginevent.dart';class SplashScreen extends StatelessWidget{@overrideWidget build(BuildContext context) {// 隐藏状态栏、虚拟键SystemChrome.setEnabledSystemUIOverlays([]);return MaterialApp(title: '启动图demo',color: Colors.white,theme: new ThemeData(brightness: Brightness.light,backgroundColor: Colors.white,platform: TargetPlatform.android),home: new _SplashScreen(),//      routes: <String, WidgetBuilder>{//        '/home': (BuildContext context) => new MyApp()//      },);}
}class _SplashScreen extends StatefulWidget {@override_SplashScreenState createState() => new _SplashScreenState();
}class _SplashScreenState extends State<_SplashScreen> {startTime() async {//设置启动图生效时间var _duration = new Duration(seconds: 3);return new Timer(_duration, navigationPage);}void navigationPage() {// Navigator.of(context).pushReplacementNamed('/home');// 由于上述路由到主页面之后，showDialog后，无法通过pop隐藏（反而是把当前界面给干掉了，导致进度条一直转）；// 所以这里发送消息到主页面，进行启动画面的隐藏处理eventBus.fire(new SplashToHomeEvent(126, "toHome"));}@overridevoid initState() {super.initState();startTime();}@overrideWidget build(BuildContext context) {return new Scaffold(body: new Center(child: new Image.asset('assets/images/splash.jpg'),),);}
}

import 'package:event_bus/event_bus.dart';EventBus eventBus = new EventBus();

 @overridevoid initState() {super.initState();// 注销监听事件eventBus.on<SplashToHomeEvent>().listen((event) {setState(() {bShowHome = true;});});}

   Future<bool> _onWillPop() {// 如果是启动画面的情况下，不触发返回弹窗；但是不允许点击退出！if (!bShowHome) {return Future.value(false);}return showDialog(context: context,builder: (context) => new AlertDialog(title: new Text('提示'),content: new Text('您确定要退出应用?'),actions: <Widget>[new FlatButton(onPressed: () => Navigator.of(context).pop(false),child: new Text('取消'),),new FlatButton(onPressed: () async {await quit();},child: new Text('退出'),),],),) ?? false;}// 退出的一种方式static Future<void> quit() async {await SystemChannels.platform.invokeMethod('SystemNavigator.pop');}