Flutter提示之Navigator operation requested with a context that does not include a Navigator.

1 、问题

用Flutter写了页面跳转，提示错误如下

Navigator operation requested with a context that does not include a Navigator.

2 、我的代码

void main() {
  runApp(MyApp1());
}

class MyApp1 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'open url',
      home: Scaffold(
          appBar: AppBar(
            title: Text('hello flutter'),
          ),
          body: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              FlatButton(
                child: Text("go to new page"),
                textColor: Colors.blue,
                onPressed: () {
                    Navigator.push(context, MaterialPageRoute(
                      builder:(context) => NewPage()));
                },
              ),
            ],

          ),
      ),
    );
  }
}

class NewPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
      return Scaffold(
        appBar: AppBar(
            title: Text("hello word"),
        ),
        body: Center(
           child: Text("this is new page"),
        ),
      );
  }
}

3、原因

Navigator operation requested with a context that does not include a Navigator.

说明这个context上下文不一致，我们看下Navigator的继承关系

class Navigator extends StatefulWidget {
}

但是我的代码是这样的

class MyApp1 extends StatelessWidget {
}

我们需要使用StatefulWidget的Context

4、解决办法

void main() {
    runApp(MaterialApp(
    title: "Navigation basics",
    home: MyApp1(),
  ));
}

用MaterialApp启动

class MaterialApp extends StatefulWidget {
***
}
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