项目中要实现环形图、饼图、柱形图、折线图，用到了charts_flutter，先看实现效果吧。项目中在使用折线图时自定义了横坐标。

pub.dev的地址
github地址
案例页面
1、在pubspec.yaml中添加依赖：

dependencies:
  charts_flutter: ^0.12.0

2、创建文件并使用，完整代码如下

import 'dart:math';

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

class DataStatistics2 extends StatefulWidget {
  final Map param;

  DataStatistics2({this.param});

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

class _DataStatisticsState extends State<DataStatistics2> {
  @override
  Widget build(BuildContext context) {
    return Container(
        color: Colors.white,
        margin: EdgeInsets.all(20.0),
        child: SingleChildScrollView(
            child: Column(children: [
          Container(height: 180, width: double.infinity, child: _lineChart()),
          Container(height: 180, width: double.infinity, child: _barChart()),
          Container(height: 180, width: double.infinity, child: _pieChart()),
          Container(height: 180, width: double.infinity, child: _pieChart1())
        ])));
  }

  Widget _lineChart() {
    List _list = ['1', '2', '3', '4'];
    var serial1data = [
      new SeriesData(0, 10),
      new SeriesData(1, 3),
      new SeriesData(2, 2),
      new SeriesData(3, 1),
      // new SeriesData(5, 10),
    ];
    //自定义x轴
    final ticks = [
      charts.TickSpec(0, label: _list[0]),
      charts.TickSpec(1, label: _list[1]),
      charts.TickSpec(2, label: _list[2]),
      charts.TickSpec(3, label: _list[3]),
    ];
    var seriesList = [
      charts.Series<SeriesData, int>(
        id: '登录次数',
        colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
        domainFn: (SeriesData sales, _) => sales.day,
        measureFn: (SeriesData sales, _) => sales.count,
        data: serial1data,
      ),
    ];
    return charts.LineChart(
      seriesList,
      animate: true,
      domainAxis: new charts.NumericAxisSpec(
        tickProviderSpec: new charts.StaticNumericTickProviderSpec(ticks),
        tickFormatterSpec: charts.BasicNumericTickFormatterSpec(
            (measure) => exp(measure).round().toString()),
      ),
    );
  }

  //柱形图
  Widget _barChart() {
    var data = [
      PieSales(
          0, 10, 'item1', charts.ColorUtil.fromDartColor(Color(0xFF265AFD))),
      PieSales(
          1, 3, 'item2', charts.ColorUtil.fromDartColor(Color(0xFF265AFD))),
      PieSales(
          2, 2, 'item3', charts.ColorUtil.fromDartColor(Color(0xFF265AFD))),
      PieSales(
          3, 1, 'item4', charts.ColorUtil.fromDartColor(Color(0xFF265AFD))),
    ];

    int num = 10 + 3 + 2 + 1;

    var seriesList = [
      charts.Series<PieSales, String>(
        id: 'Sales',
        colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
        domainFn: (PieSales sales, _) => sales.name,
        measureFn: (PieSales sales, _) => sales.sales,
        fillColorFn: (PieSales sales, _) => sales.color,
        data: data,
        labelAccessorFn: (PieSales sales, _) =>
            '${sales.sales}人,${(sales.sales / num * 100).toStringAsFixed(0)}%',
      )
    ];

    return charts.BarChart(
      seriesList,
      //进来动画效果
      animate: false,
      // 横向展示
      barGroupingType: charts.BarGroupingType.stacked,
      // 文本显示
      barRendererDecorator: new charts.BarLabelDecorator<String>(),
    );
  }

  //饼图
  Widget _pieChart() {
    var data = [
      PieSales(
          0, 10, 'item1', charts.ColorUtil.fromDartColor(Color(0xFF58A3FF))),
      PieSales(
          1, 3, 'item2', charts.ColorUtil.fromDartColor(Color(0xFF51DBB6))),
      PieSales(
          2, 2, 'item3', charts.ColorUtil.fromDartColor(Color(0xFF58A3FF))),
      PieSales(
          3, 1, 'item4', charts.ColorUtil.fromDartColor(Color(0xFF51DBB6))),
    ];

    int num = 10 + 3 + 2 + 1;

    var seriesList = [
      charts.Series<PieSales, int>(
        id: 'Sales',
        domainFn: (PieSales sales, _) => sales.domain,
        measureFn: (PieSales sales, _) => sales.sales,
        colorFn: (PieSales sales, _) => sales.color,
        data: data,
        displayName: '57',
        labelAccessorFn: (PieSales row, _) =>
            '${row.name}${row.sales}人\n ${(row.sales / num * 100).toStringAsFixed(0)}%',
      )
    ];

    return Stack(
      children: [
        charts.PieChart(seriesList,
            animate: false, //进来动画效果
            // 下方圆点
            // behaviors: [new charts.DatumLegend(
            //   position: charts.BehaviorPosition.bottom,
            // )],
            defaultRenderer: new charts.ArcRendererConfig(
                // 线
                arcRendererDecorators: [
                  new charts.ArcLabelDecorator(
                    labelPosition: charts.ArcLabelPosition.outside,
                  )
                ]))
      ],
    );
  }

  //环形图
  Widget _pieChart1() {
    List _pieList = [10, 3, 2, 1];
    var data = [
      PieSales(0, _pieList[0], 'item1',
          charts.ColorUtil.fromDartColor(Color(0xFF58A3FF))),
      PieSales(1, _pieList[1], 'item2',
          charts.ColorUtil.fromDartColor(Color(0xFF51DBB6))),
      PieSales(2, _pieList[2], 'item3',
          charts.ColorUtil.fromDartColor(Color(0xFF58A3FF))),
      PieSales(3, _pieList[3], 'item4',
          charts.ColorUtil.fromDartColor(Color(0xFF51DBB6))),
    ];
    int _personNum = 0;
    _pieList.forEach((element) {
      _personNum += element;
    });
    var seriesList = [
      charts.Series<PieSales, int>(
        id: 'Sales',
        domainFn: (PieSales sales, _) => sales.domain,
        measureFn: (PieSales sales, _) => sales.sales,
        colorFn: (PieSales sales, _) => sales.color,
        data: data,
        displayName: '50',
        labelAccessorFn: (PieSales row, _) =>
            "${row.name}\n${(row.sales / _personNum * 100).toStringAsFixed(0)}%",
        // labelAccessorFn: (PieSales row, _) =>
        // '${row.name} ${row.sales}人 ${(row.sales / _personNum * 100).toStringAsFixed(0)}%',
      )
    ];

    return Stack(
      children: [
        charts.PieChart(seriesList,
            animate: false, //进来动画效果
            // 下方圆点
            // behaviors: [new charts.DatumLegend(
            //   position: charts.BehaviorPosition.bottom,
            // )],
            defaultRenderer: new charts.ArcRendererConfig(arcWidth: 20,
                // 线
                arcRendererDecorators: [
                  new charts.ArcLabelDecorator(
                    labelPosition: charts.ArcLabelPosition.outside,
                  )
                ])),
        // 中心文字
        Center(
            child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              '$_personNum',
              style: TextStyle(fontSize: 15),
            ),
            Text(
              '人员统计',
              style: TextStyle(fontSize: 14),
            ),
          ],
        ))
      ],
    );
  }
}

class SeriesData {
  final int day;
  final int count;

  SeriesData(this.day, this.count);
}

//饼状图 自定义颜色
class PieSales {
  final int domain;
  final int sales;
  final String name;
  final charts.Color color;

  PieSales(this.domain, this.sales, this.name, this.color);
}