Flutter app 5.添加启动页

1.创建启动页

创建启动页
pages/SplashPage.dart

class SplashPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return new _SplashPageState();
  }
}

class _SplashPageState extends State<SplashPage> {


  @override
  Widget build(BuildContext context) {
    return new Container(
      color: Colors.white,
      child: new Center(
          child: new Image.asset("images/snap_icon_launcher.png", width: 60.0) ),
    );
  }


  @override
  Future initState()  {
    super.initState();
    initData();
  }

  Future getUserInfo() async {
    Map map = {};
    String result = await  NetUtils.apiRequest(Api.getUserInfo, map);
    Map<String, dynamic> resultMap = json.decode(result);

    print(resultMap);

    if( null != resultMap ){

      if( 200 == resultMap['messageCode'] || "ok" == resultMap['message']){
        var data = resultMap['data'];
        if ( null != data ){
          num id = data['id'];
          var account = data['account'];
          var nickName = data['nickName'];
          var profile = data['profile'];

          var sengledWebsite = data['sengledWebsite'];
          var privacyPolicyStatus = data['privacyPolicyStatus'];
          var upgradeAppType = data['upgradeAppType'];

          User userInfo = new User(
              id:id,
              name:nickName,
              avatar:profile,
              account:account);

          new UserHelper().setUser(userInfo) ;
          DataUtils.saveUserInfo(userInfo);

          Navigator.of(context).pushReplacementNamed('/HomePage');
        }
      } else {
        Navigator.of(context).pushReplacementNamed('/LoginPage');
      }

    }

  }

  Future initData() async {
    String  session =  await new DataHelper().getSession();
    if (null != session){
      getUserInfo();
    }else {
      Navigator.of(context).pushReplacementNamed('/LoginPage');
    }
  }

}

主页面设置路由
main.dart

void main() {
  runApp(
    new MaterialApp(
      title: 'Snap',
      home: new SplashPage(), // 闪屏页,
      routes: <String, WidgetBuilder>{ // 路由
        '/LoginPage': (BuildContext context) => new LoginPage(),
        '/HomePage': (BuildContext context) => new MainPage(),
      },
    ),
  );
}

问题

同步异步问题

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String  session =   new DataHelper().getSession();

没有 await 第一次  session  一直  获取不到