ServiceApi.dart

Purpose 

ServiceApi.dart provides a platform channel interface to communicate reference ID numbers and app version information to the native Android/iOS layers of the HealthyWear application.

Imports 

import 'package:flutter/services.dart';
import 'dart:async';

Used to define and invoke asynchronous method channel communication between Flutter and native code.

Platform Channel Definition 

static const _platform = MethodChannel('com.example.healthywear/service');

Defines a method channel with the name com.example.healthywear/service used to communicate with the platform-specific code.

Methods 

`sendIdNumber(String refNumber)`

static Future<void> sendIdNumber(String refNumber) async {
  try {
    await _platform.invokeMethod('sendIdNumber', {'refNumber': refNumber});
  } on PlatformException catch (e) {
    print("Failed to send Id ref number: '${e.message}'.");
  }
}

Sends a reference number (refNumber) to the native layer.
Catches and logs any errors from the platform side.

`sendAppVersion(String appVersion)`

static Future<void> sendAppVersion(String appVersion) async {
  await _platform.invokeMethod('sendAppVersion', {'appVersion': appVersion});
}

Sends the app version string to the native layer for logging or analytics.
Does not handle exceptions explicitly here.

Notes 

Native implementations must define methods for sendIdNumber and sendAppVersion under the given channel.
Typically used during app initialization or user identification flow.