1. 例如，下面的代码中的加号按钮可以工作并且可以更新文本，但是减号按钮不能。
2. 但是，如果我们按FloatingActionButton，则状态将刷新。
3. 减号按钮正在更改变量的值，但未更新父窗口小部件的状态。

这是代码…

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

int number;

EdgeInsets globalMargin = const EdgeInsets.symmetric(horizontal: 20.0, vertical: 20.0);
TextStyle textStyle = const TextStyle(
  fontSize: 100.0,
  color: Colors.black,
);

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  void initState() {
    super.initState();
    number = number ?? 0;
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: new Column(
        children: <Widget>[
          new Text(
            number.toString(),
            style: textStyle,
          ),
          new GridView.count(
            crossAxisCount: 2,
            shrinkWrap: true,
            scrollDirection: Axis.vertical,
            children: <Widget>[
              new InkResponse(
                child: new Container(
                    margin: globalMargin,
                    color: Colors.green,
                    child: new Center(
                      child: new Text(
                        "+",
                        style: textStyle,
                      ),
                    )),
                onTap: () {
                  setState(() {
                    number = number + 1;
                  });
                },
              ),
              new Sub(),
            ],
          ),
        ],
      ),
      floatingActionButton: new FloatingActionButton(
        onPressed: () {
          setState(() {});
        },
        child: new Icon(Icons.update),
      ),
    );
  }
}

class Sub extends StatefulWidget {
  @override
  _SubState createState() => new _SubState();
}

class _SubState extends State<Sub> {
  @override
  Widget build(BuildContext context) {
    return new InkResponse(
      child: new Container(
          margin: globalMargin,
          color: Colors.red,
          child: new Center(
            child: new Text(
              "-",
              style: textStyle,
            ),
          )),
      onTap: () {
        setState(() {
          number = number - 1;
        });
      },
    );
  }
}