Flutter生长发育标准插件growth_standards的使用
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。