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

1 、問題

用Flutter寫了頁面跳轉(zhuǎn)，提示錯誤如下

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

 
2 、我的代碼

    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.

說明這個context上下文不一致，我們看下Navigator的繼承關(guān)系

    class Navigator extends StatefulWidget {
    }

但是我的代碼是這樣的

    class MyApp1 extends StatelessWidget {
    }

我們需要使用StatefulWidget的Context


 
4、解決辦法

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

用MaterialApp啟動

    class MaterialApp extends StatefulWidget {
    ***
    }



作者：chen.yu
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