Flutter时间处理插件helix_timex的使用
Flutter时间处理插件helix_timex的使用
本项目是一个用于Flutter的时间处理插件包，包含针对Android和iOS平台的特定实现代码。
获取开始
对于想要开始使用Flutter的开发者，可以访问Flutter官方文档，其中提供了教程、示例、移动开发指导和完整的API参考。
示例代码
以下是一个使用helix_timex插件的完整示例代码：
import 'package:flutter/material.dart';
import 'package:flutter_bluetooth_serial/flutter_bluetooth_serial.dart';
import 'package:helix_timex/helix_timex.dart';
import 'dart:async';
import 'package:permission_handler/permission_handler.dart';
import 'location_service.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
bool isScanning = false;
TimexConnectionState conState = TimexConnectionState.disconnected;
HelixTimex timex = HelixTimex();
String heartRate = '';
String spo2 = '';
String sis = '';
String dis = '';
late Timer _timer;
@override
void initState() {
super.initState();
initPlatformState();
}
// 平台消息异步初始化
Future<void> initPlatformState() async {
timex.getScanningStateStream.listen((event) {
print('My Scanning State ' + event.toString());
isScanning = event;
setState(() {});
});
timex.getConnectionStateStream.listen((event) {
print('My Connection State' + event.connectionState.toString());
conState = event.connectionState!;
setState(() {});
});
timex.getHeartRateStream.listen((event) {
print('My Heart Rate' + event.toString());
heartRate = event.toString();
setState(() {});
});
timex.getSpo2Stream.listen((event) {
print('My SpO2' + event.toString());
spo2 = event.toString();
setState(() {});
});
timex.getBloodPressureStream.listen((event) {
print('My Blood Pressure' + event.toString());
sis = event['sbp'].toString();
dis = event['dbp'].toString();
setState(() {});
});
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Plugin example app'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
conState == TimexConnectionState.connected ? 'Connected' :
conState == TimexConnectionState.connecting ? 'Connecting' : 'Disconnected',
style: TextStyle(
color: conState == TimexConnectionState.connected ? Colors.green : Colors.red,
),
),
StreamBuilder<DeviceData>(
stream: timex.deviecFoundStream,
builder: (context, snapshot) {
return snapshot.data == null ?
const Text('No Device Found')
: Column(
children: [
Text((snapshot.data!.deviceName ?? '0').toString()),
Text((snapshot.data!.macAddress ?? '0').toString()),
TextButton(
onPressed: () {
timex.connect(macAddress: snapshot.data!.macAddress ?? '', deviceName: snapshot.data!.deviceName ?? '');
},
child: const Text('Connect'),
),
TextButton(
onPressed: () {
timex.disConnect();
},
child: const Text('DisConnect'),
),
TextButton(
onPressed: () {
timex.measureDynamicRate();
},
child: const Text('Measure Dynamic'),
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('Heart Rate: ' + heartRate.toString()),
TextButton(
onPressed: () {
timex.measureHeartRate();
},
child: const Text('Measure'),
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('SpO2: ' + spo2.toString()),
TextButton(
onPressed: () {
timex.measureSpo2();
},
child: const Text('Measure'),
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Column(
children: [
Text('Sis BP: ' + sis.toString()),
Text('Dis BP: ' + dis.toString()),
],
),
TextButton(
onPressed: () {
timex.measureBloodPressure();
},
child: const Text('Measure'),
),
],
),
],
);
}
),
const SizedBox(height: 10,),
isScanning ?
const CircularProgressIndicator()
: TextButton(
onPressed: () async {
startScan();
},
child: const Text('Start Scan'),
),
TextButton(
onPressed: () async {
bool isConnected = await timex.isConnected();
print(isConnected);
},
child: const Text('See If Connected'),
)
],
),
),
),
);
}
void startScan() async {
bool locationEnable = await LocationService().enableGPS();
await FlutterBluetoothSerial.instance.requestEnable();
await Permission.location.request();
if (locationEnable) {
bool bluetoothEnable = (await FlutterBluetoothSerial.instance.isEnabled) ?? false;
if (bluetoothEnable) {
if (await Permission.location.isGranted) {
timex.startScanDevice();
} else {
alertToast(context, 'Location Permission is required to use this feature');
}
} else {
alertToast(context, 'Please enable Bluetooth to use this feature');
}
} else {
alertToast(context, 'Please enable Location to use this feature');
}
}
}
示例代码解释
-
导入必要的库:
import 'package:flutter/material.dart'; import 'package:flutter_bluetooth_serial/flutter_bluetooth_serial.dart'; import 'package:helix_timex/helix_timex.dart'; import 'dart:async'; import 'package:permission_handler/permission_handler.dart'; -
初始化应用:
void main() { runApp(const MyApp()); } -
定义状态管理类:
class MyApp extends StatefulWidget { const MyApp({Key? key}) : super(key: key); @override State<MyApp> createState() => _MyAppState(); } class _MyAppState extends State<MyApp> { bool isScanning = false; TimexConnectionState conState = TimexConnectionState.disconnected; HelixTimex timex = HelixTimex(); String heartRate = ''; String spo2 = ''; String sis = ''; String dis = ''; late Timer _timer; @override void initState() { super.initState(); initPlatformState(); } -
异步初始化平台状态:
Future<void> initPlatformState() async { timex.getScanningStateStream.listen((event) { print('My Scanning State ' + event.toString()); isScanning = event; setState(() {}); }); timex.getConnectionStateStream.listen((event) { print('My Connection State' + event.connectionState.toString()); conState = event.connectionState!; setState(() {}); }); timex.getHeartRateStream.listen((event) { print('My Heart Rate' + event.toString()); heartRate = event.toString(); setState(() {}); }); timex.getSpo2Stream.listen((event) { print('My SpO2' + event.toString()); spo2 = event.toString(); setState(() {}); }); timex.getBloodPressureStream.listen((event) { print('My Blood Pressure' + event.toString()); sis = event['sbp'].toString(); dis = event['dbp'].toString(); setState(() {}); }); } -
构建UI:
@override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: const Text('Plugin example app'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ Text( conState == TimexConnectionState.connected ? 'Connected' : conState == TimexConnectionState.connecting ? 'Connecting' : 'Disconnected', style: TextStyle( color: conState == TimexConnectionState.connected ? Colors.green : Colors.red, ), ), StreamBuilder<DeviceData>( stream: timex.deviecFoundStream, builder: (context, snapshot) { return snapshot.data == null ? const Text('No Device Found') : Column( children: [ Text((snapshot.data!.deviceName ?? '0').toString()), Text((snapshot.data!.macAddress ?? '0').toString()), TextButton( onPressed: () { timex.connect(macAddress: snapshot.data!.macAddress ?? '', deviceName: snapshot.data!.deviceName ?? ''); }, child: const Text('Connect'), ), TextButton( onPressed: () { timex.disConnect(); }, child: const Text('DisConnect'), ), TextButton( onPressed: () { timex.measureDynamicRate(); }, child: const Text('Measure Dynamic'), ), Row( mainAxisAlignment: MainAxisAlignment.center, children: [ Text('Heart Rate: ' + heartRate.toString()), TextButton( onPressed: () { timex.measureHeartRate(); }, child: const Text('Measure'), ), ], ), Row( mainAxisAlignment: MainAxisAlignment.center, children: [ Text('SpO2: ' + spo2.toString()), TextButton( onPressed: () { timex.measureSpo2(); }, child: const Text('Measure'), ), ], ), Row( mainAxisAlignment: MainAxisAlignment.center, children: [ Column( children: [ Text('Sis BP: ' + sis.toString()), Text('Dis BP: ' + dis.toString()), ], ), TextButton( onPressed: () { timex.measureBloodPressure(); }, child: const Text('Measure'), ), ], ), ], ); } ), const SizedBox(height: 10,), isScanning ? const CircularProgressIndicator() : TextButton( onPressed: () async { startScan(); }, child: const Text('Start Scan'), ), TextButton( onPressed: () async { bool isConnected = await timex.isConnected(); print(isConnected); }, child: const Text('See If Connected'), ) ], ), ), ), ); } -
开始扫描设备:
void startScan() async { bool locationEnable = await LocationService().enableGPS(); await FlutterBluetoothSerial.instance.requestEnable(); await Permission.location.request(); if (locationEnable) { bool bluetoothEnable = (await FlutterBluetoothSerial.instance.isEnabled) ?? false; if (bluetoothEnable) { if (await Permission.location.isGranted) { timex.startScanDevice(); } else { alertToast(context, 'Location Permission is required to use this feature'); } } else { alertToast(context, 'Please enable Bluetooth to use this feature'); } } else { alertToast(context, 'Please enable Location to use this feature'); } }
更多关于Flutter时间处理插件helix_timex的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter时间处理插件helix_timex的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
helix_timex 是一个用于 Flutter 的时间处理插件，它提供了丰富的功能来处理日期和时间。以下是如何在 Flutter 项目中使用 helix_timex 插件的基本步骤和示例。
1. 安装插件
首先，你需要在 pubspec.yaml 文件中添加 helix_timex 插件的依赖：
dependencies:
flutter:
sdk: flutter
helix_timex: ^1.0.0 # 请检查最新版本
然后运行 flutter pub get 来安装插件。
2. 导入插件
在你的 Dart 文件中导入 helix_timex 插件：
import 'package:helix_timex/helix_timex.dart';
3. 使用插件
helix_timex 提供了多种功能来处理日期和时间。以下是一些常见的用法示例：
3.1 获取当前时间
DateTime now = HelixTimex.now();
print('当前时间: $now');
3.2 格式化时间
String formattedTime = HelixTimex.format(now, 'yyyy-MM-dd HH:mm:ss');
print('格式化后的时间: $formattedTime');
3.3 解析时间字符串
DateTime parsedTime = HelixTimex.parse('2023-10-05 14:30:00');
print('解析后的时间: $parsedTime');
3.4 时间加减
DateTime futureTime = HelixTimex.add(now, Duration(days: 7));
print('一周后的时间: $futureTime');
DateTime pastTime = HelixTimex.subtract(now, Duration(days: 7));
print('一周前的时间: $pastTime');
3.5 时间比较
bool isAfter = HelixTimex.isAfter(futureTime, now);
print('一周后的时间是否在当前时间之后: $isAfter');
bool isBefore = HelixTimex.isBefore(pastTime, now);
print('一周前的时间是否在当前时间之前: $isBefore');
3.6 计算时间差
Duration difference = HelixTimex.difference(futureTime, now);
print('时间差: $difference');
4. 其他功能
helix_timex 还提供了其他一些实用功能，比如：
- 获取某个月的第一天和最后一天
- 判断某一天是否是工作日或周末
- 计算两个日期之间的工作日天数
- 等等
你可以查阅插件的官方文档或源代码来了解更多详细的功能和用法。
5. 注意事项
- 确保你使用的
helix_timex版本是最新的，并且与你的 Flutter SDK 版本兼容。 - 如果你在使用过程中遇到任何问题，可以查看插件的 GitHub 仓库或向社区寻求帮助。
6. 示例代码
以下是一个完整的示例代码，展示了如何使用 helix_timex 插件：
import 'package:flutter/material.dart';
import 'package:helix_timex/helix_timex.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('HelixTimex 示例'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ElevatedButton(
onPressed: () {
DateTime now = HelixTimex.now();
print('当前时间: $now');
String formattedTime = HelixTimex.format(now, 'yyyy-MM-dd HH:mm:ss');
print('格式化后的时间: $formattedTime');
DateTime futureTime = HelixTimex.add(now, Duration(days: 7));
print('一周后的时间: $futureTime');
bool isAfter = HelixTimex.isAfter(futureTime, now);
print('一周后的时间是否在当前时间之后: $isAfter');
},
child: Text('测试 HelixTimex'),
),
],
),
),
),
);
}
}