接收类型为"List<系列<动态，动态>>"的运行时错误不是'List< Series< dynamic，num>>'类型的子类型chart_flutter [英] Receiving runtime error with type 'List<Series<dynamic, dynamic>>' is not a subtype of type 'List<Series<dynamic, num>>' charts_flutter

问题描述

我正在尝试使 charts_flutter 变得扑朔迷离，并且我已经使用 LineChart 示例进行了修改，以适合我的应用程序.我没有收到任何构建错误，但是，我收到了

I'm trying to get the charts_flutter for flutter, and I've used the LineChart example with modifications to fit into my app. I'm not receiving any build errors, however, I'm receiving a run time error of

'List<Series<dynamic, dynamic>>' is not a subtype of type 'List<Series<dynamic, num>>' 

这是构建图表的代码

  _buildChart() {


    if (seriesList == null) {
      return Container();
    } else {
      return new charts.LineChart(seriesList, animate: true);
    }
  }

我将系列填充为:

setState(() {
                  seriesList = [
                    charts.Series<Stat, num>(
                      id: 'Income',
                      colorFn: (_, __) =>
                          charts.MaterialPalette.blue.shadeDefault,
                      domainFn: (Stat stat, _)=> stat.month,
                      measureFn: (Stat stat, _) => stat.amount,
                      data: stats.monthlyIncomes.data,
                    )
                  ];

从我看到的内容来看，我确实在执行示例所显示的内容，但是我收到此错误-我需要解决什么问题?

From what I can see I'm doing exactly what the example is showing, but I'm receiving this error - what would i need to resolve this ?

推荐答案

将您的 seriesList 声明更改为

List<charts.Series<Stat, num>> seriesList= []

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