调用颤振中的多个不同图表-图表颤振0.5.0包

我有一个简单的条形图,来自包装图,我想在另一个页面这样叫它,或者我的目标是,让更多的图表像饼图和其他一些图表一样进入它。

 Widget build(BuildContext context) {

    List<Series> seriesList;

    return Scaffold(
      appBar: AppBar(
        elevation: 0,
        title: Text(
          "Charts",
          style: TextStyle(color: Colors.blueGrey),
          textAlign: TextAlign.center,
        ),
        backgroundColor: Colors.transparent,
        iconTheme: IconThemeData(color: Colors.blueGrey),
      ),
      body: ListView(
        children: <Widget>[
          SimpleBarChart(seriesList), //<-- I've added this line
        ],
      ),
    );
  }

图表的代码如下:在此处查找更多信息: https://google.github.io/charts/flutter/gallery.html

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

class SimpleBarChart extends StatelessWidget {
  final List<charts.Series> seriesList;
  final bool animate;

  SimpleBarChart(this.seriesList, {this.animate});

  /// Creates a [BarChart] with sample data and no transition.
  factory SimpleBarChart.withSampleData() {
    return new SimpleBarChart(
      _createSampleData(),
      // Disable animations for image tests.
      animate: false,
    );
  }


  @override
  Widget build(BuildContext context) {
    return new charts.BarChart(
      seriesList,
      animate: animate,
    );
  }

  /// Create one series with sample hard coded data.
  static List<charts.Series<OrdinalSales, String>> _createSampleData() {
    final data = [
      new OrdinalSales('2014', 5),
      new OrdinalSales('2015', 25),
      new OrdinalSales('2016', 100),
      new OrdinalSales('2017', 75),
    ];

    return [
      new charts.Series<OrdinalSales, String>(
        id: 'Sales',
        colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
        domainFn: (OrdinalSales sales, _) => sales.year,
        measureFn: (OrdinalSales sales, _) => sales.sales,
        data: data,
      )
    ];
  }
}

/// Sample ordinal data type.
class OrdinalSales {
  final String year;
  final int sales;

  OrdinalSales(this.year, this.sales);
}

目前我收到一个白页,有这个错误

e/flutter(14450):[错误:flutter/shell/common/shell.cc(184)]dart错误:未处理的异常:

e/flutter(14450):无法对从未布置的渲染框进行测试。

e/flutter(14450):在此renderbox上调用了hitest()方法:

e/flutter(14450):渲染器rorbox 20CD4需求-布局需求-油漆

e/flutter(14450):不幸的是,目前还不知道这个物体的几何结构,可能是因为它从未被布置好。这意味着它不能被准确的命中测试。如果试图在布局阶段本身执行命中测试,请确保只命中已完成布局的测试节点(例如,在调用了节点的layout()方法之后,节点的子节点)。

这是包装: https://pub.dartlang.org/packages/charts_flutter#-readme-tab-