在flutter页面中显示一个显示随机数据的曲线图

要在Flutter页面中显示一个随机数据的曲线图，可以使用Flutter中的charts_flutter库。以下是实现的步骤：

1. 在pubspec.yaml文件中添加charts_flutter库的依赖：

dependencies:
  charts_flutter: ^0.9.0

2. 导入charts_flutter库：

import 'package:charts_flutter/flutter.dart' as charts;

3. 创建一个随机数据的List：

List<charts.Series> _createRandomData() {
  final data = [
    new MyData(0, _getRandomInt()),
    new MyData(1, _getRandomInt()),
    new MyData(2, _getRandomInt()),
    new MyData(3, _getRandomInt()),
    new MyData(4, _getRandomInt()),
    new MyData(5, _getRandomInt()),
  ];

  return [
    new charts.Series<MyData, int>(
      id: 'Data',
      domainFn: (MyData data, _) => data.index,
      measureFn: (MyData data, _) => data.value,
      data: data,
    )
  ];
}

class MyData {
  final int index;
  final int value;

  MyData(this.index, this.value);
}

int _getRandomInt() {
  return new Random().nextInt(100);
}

4. 创建一个LineChart：

charts.LineChart(
  _createRandomData(),
  animate: true,
  animationDuration: Duration(milliseconds: 500),
)

完整的示例代码如下：

import 'dart:math';

import 'package:flutter/material.dart';
import 'package:charts_flutter/flutter.dart' as charts;

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

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

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: charts.LineChart(
          _createRandomData(),
          animate: true,
          animationDuration: Duration(milliseconds: 500),
        ),
      ),
    );
  }

  List<charts.Series> _createRandomData() {
    final data = [
      new MyData(0, _getRandomInt()),
      new MyData(1, _getRandomInt()),
      new MyData(2, _getRandomInt()),
      new MyData(3, _getRandomInt()),
      new MyData(4, _getRandomInt()),
      new MyData(5, _getRandomInt()),
    ];

    return [
      new charts.Series<MyData, int>(
        id: 'Data',
        domainFn: (MyData data, _) => data.index,
        measureFn: (MyData data, _) => data.value,
        data: data,
      )
    ];
  }

  int _getRandomInt() {
    return new Random().nextInt(100);
  }
}

class MyData {
  final int index;
  final int value;

  MyData(this.index, this.value);
}

注意：由于图表是随机生成的，每次运行应用程序时都会有不同的结果。