Flutter生长发育标准插件growth_standards的使用

发布于 1周前 作者 sinazl 来自 Flutter

Flutter生长发育标准插件growth_standards的使用

示例代码

// ignore_for_file: avoid_print

import 'package:growth_standards/growth_standards.dart';

final birthDay = Date(year: 2022, month: Months.june, date: 30);
const weight = 11.75;
const length = 82.8;

const centimeters = Length$Centimeter(length);
const kilograms = Mass$Kilogram(weight);
final age = Age(birthDay);

final gs = GrowthStandard.who.fromBirthTo5Years;
const sex = Sex.male;

void main() {
  print(
    'Age: ${age.yearsMonthsWeeksDaysOfAgeByNow} with total ${age.ageInTotalMonthsByNow} in Months or ${age.ageInTotalDaysByNow} in Days',
  );
  // 计算站立时的长度年龄对应的调整后的z分数
  final calcLengthForAgeStanding = gs.lengthForAge(
    age: age,
    lengthHeight: centimeters,
    sex: sex,
    measure: LengthHeightMeasurementPosition.standing,
  );
  print(age.toJson());
  print(birthDay.toJson());
  print(Date.fromJson(birthDay.toJson()));
  print(Age.fromJson(age.toJson()));

  print(calcLengthForAgeStanding.zScore(Precision.two)); // 输出z分数
  print(calcLengthForAgeStanding.percentile(Precision.two)); // 输出百分位数
  print(calcLengthForAgeStanding.toJson()); // 输出json格式的结果

  // 将站立测量改为俯卧测量
  final calcLengthForAgeRecumbent = calcLengthForAgeStanding.copyWith(
    measure: LengthHeightMeasurementPosition.recumbent,
  );
  print(calcLengthForAgeRecumbent.zScore(Precision.two));
  print(calcLengthForAgeRecumbent.percentile(Precision.two));
  print(calcLengthForAgeRecumbent.toJson());

  // 计算年龄对应的体重
  final calcWeightForAge = gs.weightForAge(
    age: age,
    weight: kilograms,
    sex: sex,
  );

  print(calcWeightForAge.zScore(Precision.two));
  print(calcWeightForAge.percentile(Precision.two));
  print(calcWeightForAge.toJson());

  // 计算长度对应的体重
  final calcWeightForLength = gs.weightForLength(
    lengthMeasurementResult: centimeters,
    massMeasurementResult: kilograms,
    sex: sex,
    age: age,
    measure: LengthHeightMeasurementPosition.recumbent,
  );
  print(calcWeightForLength.zScore(Precision.two));
  print(calcWeightForLength.percentile(Precision.two));
  print(calcWeightForLength.toJson());

  // 计算年龄对应的BMI
  final calcBMIForAge = gs.bodyMassIndexForAge(
    bodyMassIndexMeasurement:
        WHOGrowthStandardsBodyMassIndexMeasurement.fromMeasurement(
      measure: LengthHeightMeasurementPosition.recumbent,
      lengthHeight: centimeters,
      weight: kilograms,
      age: age,
    ),
    sex: sex,
  );

  print(calcBMIForAge.zScore(Precision.two));
  print(calcBMIForAge.percentile(Precision.two));
  print(calcBMIForAge.toJson());
}

更多关于Flutter生长发育标准插件growth_standards的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter生长发育标准插件growth_standards的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然,以下是一个关于如何在Flutter项目中使用growth_standards插件的示例代码。growth_standards插件通常用于儿童生长发育标准数据的查询和展示。虽然具体实现可能依赖于插件的版本和功能,但以下代码提供了一个基本的使用范例。

首先,确保你已经在pubspec.yaml文件中添加了growth_standards依赖:

dependencies:
  flutter:
    sdk: flutter
  growth_standards: ^最新版本号  # 替换为实际的最新版本号

然后,运行flutter pub get来安装依赖。

接下来,在你的Flutter项目中,你可以按照以下方式使用growth_standards插件:

import 'package:flutter/material.dart';
import 'package:growth_standards/growth_standards.dart'; // 导入插件

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

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

class GrowthStandardsScreen extends StatefulWidget {
  @override
  _GrowthStandardsScreenState createState() => _GrowthStandardsScreenState();
}

class _GrowthStandardsScreenState extends State<GrowthStandardsScreen> {
  late GrowthStandardsService _growthStandardsService;

  @override
  void initState() {
    super.initState();
    // 初始化GrowthStandardsService,假设插件提供了这样的服务类
    _growthStandardsService = GrowthStandardsService();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Growth Standards Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextField(
              decoration: InputDecoration(
                labelText: 'Enter Age (in months)',
              ),
              keyboardType: TextInputType.number,
              onSubmitted: (String ageStr) async {
                int age = int.parse(ageStr);
                try {
                  // 假设插件提供了按年龄查询生长发育标准数据的方法
                  var standards = await _growthStandardsService.getStandardsByAge(age);
                  showDialog(
                    context: context,
                    builder: (context) => AlertDialog(
                      title: Text('Growth Standards for $age Months'),
                      content: SingleChildScrollView(
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: standards.map((standard) {
                            return Text('${standard.metric}: ${standard.value}');
                          }).toList(),
                        ),
                      ),
                      actions: <Widget>[
                        TextButton(
                          onPressed: () => Navigator.of(context).pop(),
                          child: Text('OK'),
                        ),
                      ],
                    ),
                  );
                } catch (e) {
                  // 处理错误
                  print('Error fetching growth standards: $e');
                }
              },
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () async {
                // 假设插件提供了获取所有生长发育标准数据的方法
                var allStandards = await _growthStandardsService.getAllStandards();
                // 这里只是简单打印数据,实际应用中可能需要在UI中展示
                print('All Growth Standards: $allStandards');
              },
              child: Text('Get All Standards'),
            ),
          ],
        ),
      ),
    );
  }
}

// 假设插件返回的数据结构类似于以下类
class GrowthStandard {
  String metric;
  double value;

  GrowthStandard({required this.metric, required this.value});
}

// 假设插件提供的服务类接口类似于以下
abstract class GrowthStandardsService {
  Future<List<GrowthStandard>> getStandardsByAge(int age);
  Future<List<GrowthStandard>> getAllStandards();
}

请注意,上述代码是一个假设性的示例,因为growth_standards插件的具体API和实现细节可能与此不同。你需要参考插件的官方文档或源代码来获取准确的API信息和使用方法。

如果插件没有提供GrowthStandardsService这样的服务类,或者API接口不同,你需要根据插件的实际文档进行相应的调整。此外,错误处理和UI展示也可能需要根据实际需求进行进一步的优化和定制。

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