鸿蒙跨端智能车辆停放计时系统开发指南 原创

鸿蒙跨端智能车辆停放计时系统开发指南

一、项目概述

本文基于HarmonyOS的分布式能力和传感器技术，开发一套智能车辆停放计时系统。该系统通过地磁传感器检测车辆停放状态，自动计算停车费用，并借鉴《鸿蒙跨端U同步》中的多设备同步技术，实现与微信小程序的联动支付和状态查询。

二、系统架构

±--------------------+ ±--------------------+ ±--------------------+
地磁检测终端 <-----> 分布式数据总线 <-----> 微信小程序
(停车场节点) (Distributed Bus) (用户终端)
±---------±---------+ ±---------±---------+ ±---------±---------+

±---------v----------+ ±---------v----------+ ±---------v----------+
车辆检测模块 计费管理模块 用户交互模块
(地磁传感器) (计时/费用计算) (支付/状态同步)

±--------------------+ ±--------------------+ ±--------------------+

三、核心代码实现
地磁传感器服务实现

// src/main/ets/service/ParkingSensorService.ts
import { distributedData } from ‘@ohos.data.distributedData’;
import { BusinessError } from ‘@ohos.base’;
import { sensor } from ‘@ohos.sensor’;
import { geoLocationManager } from ‘@ohos.geoLocationManager’;
import { notification } from ‘@ohos.notification’;

interface ParkingEvent {
eventId: string;
parkingId: string;
timestamp: number;
eventType: ‘arrival’ | ‘departure’;
vehicleId?: string;
isSynced: boolean;
interface ParkingRecord {

recordId: string;
parkingId: string;
vehicleId: string;
arrivalTime: number;
departureTime?: number;
fee?: number;
isPaid: boolean;
isSynced: boolean;
export class ParkingSensorService {

private static instance: ParkingSensorService;
private kvStore: distributedData.KVStore | null = null;
private readonly STORE_ID = ‘parking_store’;
private geomagneticSensorId: number = -1;
private parkingEvents: ParkingEvent[] = [];
private parkingRecords: ParkingRecord[] = [];
private lastSyncTime: number = 0;
private readonly SYNC_INTERVAL = 5 60 1000; // 5分钟同步一次

private constructor() {
this.initKVStore();
this.initGeomagneticSensor();
public static getInstance(): ParkingSensorService {

if (!ParkingSensorService.instance) {
  ParkingSensorService.instance = new ParkingSensorService();

return ParkingSensorService.instance;

private async initKVStore(): Promise<void> {

try {
  const options: distributedData.KVManagerConfig = {
    bundleName: 'com.example.parking',
    userInfo: {
      userId: '0',
      userType: distributedData.UserType.SAME_USER_ID

};

  const kvManager = distributedData.createKVManager(options);
  this.kvStore = await kvManager.getKVStore({
    storeId: this.STORE_ID,
    options: {
      createIfMissing: true,
      encrypt: false,
      backup: false,
      autoSync: true,
      kvStoreType: distributedData.KVStoreType.SINGLE_VERSION

});

  this.kvStore.on('dataChange', distributedData.SubscribeType.SUBSCRIBE_TYPE_REMOTE, (data) => {
    this.handleRemoteDataChange(data);
  });

catch (e) {

  console.error(Failed to initialize KVStore. Code: {e.code}, message: {e.message});

}

private async initGeomagneticSensor(): Promise<void> {
try {
this.geomagneticSensorId = await sensor.on(sensor.SensorId.GEOMAGNETIC_FIELD, {
interval: sensor.SensorFrequency.SENSOR_DELAY_NORMAL,
callback: (data) => {
this.handleGeomagneticData(data);
});

catch (e) {

  console.error(Failed to initialize geomagnetic sensor. Code: {e.code}, message: {e.message});

}

private async handleGeomagneticData(data: sensor.GeomagneticResponse): Promise<void> {
// 车辆检测算法 (简化版)
const fieldStrength = Math.sqrt(
data.x * data.x +
data.y * data.y +
data.z * data.z
);

// 检测车辆到达或离开 (实际应用中应使用更复杂的算法)
const isVehiclePresent = this.detectVehicle(fieldStrength);
const lastEvent = this.parkingEvents[this.parkingEvents.length - 1];

if (isVehiclePresent && (!lastEvent || lastEvent.eventType === 'departure')) {
  // 车辆到达
  const newEvent: ParkingEvent = {
    eventId: 'event_' + Date.now(),
    parkingId: this.getParkingId(),
    timestamp: Date.now(),
    eventType: 'arrival',
    isSynced: false
  };
  
  this.parkingEvents.push(newEvent);
  this.createParkingRecord(newEvent);

else if (!isVehiclePresent && lastEvent && lastEvent.eventType === ‘arrival’) {

  // 车辆离开
  const newEvent: ParkingEvent = {
    eventId: 'event_' + Date.now(),
    parkingId: this.getParkingId(),
    timestamp: Date.now(),
    eventType: 'departure',
    isSynced: false
  };
  
  this.parkingEvents.push(newEvent);
  this.updateParkingRecord(newEvent);

// 定期同步数据

const now = Date.now();
if (now - this.lastSyncTime > this.SYNC_INTERVAL) {
  await this.syncData();
  this.lastSyncTime = now;

}

private detectVehicle(fieldStrength: number): boolean {
// 简化版车辆检测算法 (实际应用中应使用更复杂的算法)
const baseStrength = 50; // 基准磁场强度 (μT)
return Math.abs(fieldStrength - baseStrength) > 10; // 磁场变化超过阈值
private getParkingId(): string {

// 实际应用中应获取真实停车位ID
return 'parking_' + Math.random().toString(36).substr(2, 6);

private createParkingRecord(event: ParkingEvent): void {

const newRecord: ParkingRecord = {
  recordId: 'record_' + event.timestamp,
  parkingId: event.parkingId,
  vehicleId: event.vehicleId || 'unknown',
  arrivalTime: event.timestamp,
  isPaid: false,
  isSynced: false
};

this.parkingRecords.push(newRecord);
this.notifyParkingStart(newRecord);

private updateParkingRecord(event: ParkingEvent): void {

const activeRecord = this.parkingRecords.find(

=> r.parkingId === event.parkingId && !r.departureTime

);

if (activeRecord) {
  activeRecord.departureTime = event.timestamp;
  activeRecord.fee = this.calculateFee(activeRecord);
  activeRecord.isSynced = false;
  
  this.notifyParkingEnd(activeRecord);

}

private calculateFee(record: ParkingRecord): number {
if (!record.departureTime) return 0;

const durationHours = (record.departureTime - record.arrivalTime) / (1000  60  60);
const hourlyRate = 5; // 5元/小时
return Math.ceil(durationHours * hourlyRate);

private async notifyParkingStart(record: ParkingRecord): Promise<void> {

try {
  await notification.publish({
    id: 1,
    contentType: notification.ContentType.NOTIFICATION_CONTENT_BASIC_TEXT,
    normal: {
      title: '车辆停放检测',
      text: 停车位 ${record.parkingId} 检测到车辆到达,
      additionalText: new Date(record.arrivalTime).toLocaleTimeString()

});

catch (e) {

  console.error(Failed to publish notification. Code: {e.code}, message: {e.message});

}

private async notifyParkingEnd(record: ParkingRecord): Promise<void> {
try {
await notification.publish({
id: 2,
contentType: notification.ContentType.NOTIFICATION_CONTENT_BASIC_TEXT,
normal: {
title: ‘车辆离开检测’,
text: 停车位 {record.parkingId} 车辆离开，费用: {record.fee}元,
additionalText: new Date(record.departureTime!).toLocaleTimeString()
});

catch (e) {

  console.error(Failed to publish notification. Code: {e.code}, message: {e.message});

}

public async syncData(): Promise<void> {
if (!this.kvStore) return;

try {
  // 同步未同步的停车事件
  const unsyncedEvents = this.parkingEvents.filter(e => !e.isSynced);
  if (unsyncedEvents.length > 0) {
    await this.kvStore.put('parking_events', { value: unsyncedEvents });
    this.parkingEvents.forEach(e => {
      if (!e.isSynced) e.isSynced = true;
    });

// 同步未同步的停车记录

  const unsyncedRecords = this.parkingRecords.filter(r => !r.isSynced);
  if (unsyncedRecords.length > 0) {
    await this.kvStore.put('parking_records', { value: unsyncedRecords });
    this.parkingRecords.forEach(r => {
      if (!r.isSynced) r.isSynced = true;
    });

} catch (e) {

  console.error(Failed to sync data. Code: {e.code}, message: {e.message});

}

private handleRemoteDataChange(data: distributedData.ChangeData): void {
data.insertEntries.forEach((entry: distributedData.Entry) => {
if (entry.key === ‘parking_events’) {
const remoteEvents = entry.value.value as ParkingEvent[];
this.mergeParkingEvents(remoteEvents);
else if (entry.key === ‘parking_records’) {

    const remoteRecords = entry.value.value as ParkingRecord[];
    this.mergeParkingRecords(remoteRecords);

});

private mergeParkingEvents(remoteEvents: ParkingEvent[]): void {

remoteEvents.forEach(remote => {
  const existing = this.parkingEvents.find(local => local.eventId === remote.eventId);
  
  if (!existing) {
    this.parkingEvents.push(remote);

});

private mergeParkingRecords(remoteRecords: ParkingRecord[]): void {

remoteRecords.forEach(remote => {
  const existing = this.parkingRecords.find(local => local.recordId === remote.recordId);
  
  if (!existing) {
    this.parkingRecords.push(remote);

else {

    // 合并支付状态
    if (remote.isPaid && !existing.isPaid) {
      existing.isPaid = true;

}

});

public getActiveParkingRecords(): ParkingRecord[] {

return this.parkingRecords.filter(r => !r.departureTime);

public getCompletedParkingRecords(): ParkingRecord[] {

return this.parkingRecords.filter(r => r.departureTime);

public async destroy(): Promise<void> {

if (this.geomagneticSensorId !== -1) {
  await sensor.off(this.geomagneticSensorId);
  this.geomagneticSensorId = -1;

if (this.kvStore) {

  this.kvStore.off('dataChange');

}

微信小程序联动服务

// src/main/ets/service/WeChatMiniProgramService.ts
import { BusinessError } from ‘@ohos.base’;
import { distributedData } from ‘@ohos.data.distributedData’;
import { http } from ‘@ohos.net.http’;

export class WeChatMiniProgramService {
private static instance: WeChatMiniProgramService;
private kvStore: distributedData.KVStore | null = null;
private readonly STORE_ID = ‘wechat_store’;
private readonly API_BASE_URL = ‘https://api.weixin.qq.com’;

private constructor() {
this.initKVStore();
public static getInstance(): WeChatMiniProgramService {

if (!WeChatMiniProgramService.instance) {
  WeChatMiniProgramService.instance = new WeChatMiniProgramService();

return WeChatMiniProgramService.instance;

private async initKVStore(): Promise<void> {

try {
  const options: distributedData.KVManagerConfig = {
    bundleName: 'com.example.parking',
    userInfo: {
      userId: '0',
      userType: distributedData.UserType.SAME_USER_ID

};

  const kvManager = distributedData.createKVManager(options);
  this.kvStore = await kvManager.getKVStore({
    storeId: this.STORE_ID,
    options: {
      createIfMissing: true,
      encrypt: false,
      backup: false,
      autoSync: true,
      kvStoreType: distributedData.KVStoreType.SINGLE_VERSION

});

catch (e) {

  console.error(Failed to initialize KVStore. Code: {e.code}, message: {e.message});

}

public async syncParkingRecordsToWeChat(records: ParkingRecord[]): Promise<boolean> {
try {
// 获取访问令牌
const accessToken = await this.getWeChatAccessToken();
if (!accessToken) return false;

  // 同步停车记录到微信小程序
  const response = await this.sendRequest({
    url: ${this.API_BASE_URL}/wxa/parking/sync,
    method: 'POST',
    header: {
      'Content-Type': 'application/json',
      'Authorization': Bearer ${accessToken}
    },
    body: {
      records: records.map(r => ({
        record_id: r.recordId,
        parking_id: r.parkingId,
        arrival_time: r.arrivalTime,
        departure_time: r.departureTime,
        fee: r.fee,
        is_paid: r.isPaid
      }))

});

  return response.code === 200;

catch (e) {

  console.error(Failed to sync records to WeChat. Code: {e.code}, message: {e.message});
  return false;

}

private async getWeChatAccessToken(): Promise<string | null> {
try {
// 从本地缓存获取令牌
const cachedToken = await this.kvStore?.get(‘wechat_access_token’);
if (cachedToken && cachedToken.expires_at > Date.now()) {
return cachedToken.token;
// 从微信服务器获取新令牌

  const response = await this.sendRequest({
    url: ${this.API_BASE_URL}/cgi-bin/token,
    method: 'GET',
    params: {
      grant_type: 'client_credential',
      appid: 'YOUR_APPID',
      secret: 'YOUR_SECRET'

});

  if (response.access_token) {
    // 缓存令牌
    await this.kvStore?.put('wechat_access_token', {
      token: response.access_token,
      expires_at: Date.now() + (response.expires_in * 1000)
    });
    
    return response.access_token;

return null;

catch (e) {

  console.error(Failed to get WeChat access token. Code: {e.code}, message: {e.message});
  return null;

}

private async sendRequest(options: {
url: string;
method: ‘GET’ | ‘POST’;
header?: Record<string, string>;
params?: Record<string, string>;
body?: any;
}): Promise<any> {
const httpRequest = http.createHttp();

try {
  let url = options.url;
  if (options.method === 'GET' && options.params) {
    const params = new URLSearchParams(options.params).toString();
    url += ?${params};

const response = await httpRequest.request(url, {

    method: options.method,
    header: options.header,
    extraData: options.method === 'POST' ? JSON.stringify(options.body) : undefined
  });
  
  return JSON.parse(response.result as string);

catch (e) {

  throw e;

finally {

  httpRequest.destroy();

}

停车计费组件实现

// src/main/ets/components/ParkingTimer.ets
@Component
export struct ParkingTimer {
private parkingService = ParkingSensorService.getInstance();
private wechatService = WeChatMiniProgramService.getInstance();
@State activeRecords: ParkingRecord[] = [];
@State completedRecords: ParkingRecord[] = [];
private timer: number = 0;

aboutToAppear(): void {
this.loadData();
this.startAutoRefresh();
aboutToDisappear(): void {

this.stopAutoRefresh();

private loadData(): void {

this.activeRecords = this.parkingService.getActiveParkingRecords();
this.completedRecords = this.parkingService.getCompletedParkingRecords();

private startAutoRefresh(): void {

this.timer = setInterval(() => {
  this.loadData();
}, 10000); // 每10秒刷新一次

private stopAutoRefresh(): void {

if (this.timer) {
  clearInterval(this.timer);
  this.timer = 0;

}

build() {
Column() {
// 标题
Text(‘智能停车计时系统’)
.fontSize(24)
.fontWeight(FontWeight.Bold)
.margin({ bottom: 20 });

  // 当前停车记录
  Text('当前停车')
    .fontSize(18)
    .fontWeight(FontWeight.Bold)
    .margin({ bottom: 10 });
  
  if (this.activeRecords.length > 0) {
    this.buildActiveRecords();

else {

    Text('暂无车辆停放')
      .fontSize(14)
      .fontColor('#666666');

// 历史停车记录

  Text('历史记录')
    .fontSize(18)
    .fontWeight(FontWeight.Bold)
    .margin({ top: 20, bottom: 10 });
  
  if (this.completedRecords.length > 0) {
    this.buildCompletedRecords();

else {

    Text('暂无历史记录')
      .fontSize(14)
      .fontColor('#666666');

}

.width('100%')
.height('100%')
.padding(20);

@Builder

private buildActiveRecords() {
ForEach(this.activeRecords, (record) => {
Column() {
Row() {
Text(停车位: ${record.parkingId})
.fontSize(16)
.fontWeight(FontWeight.Bold)
.layoutWeight(1);

      Text(已停: ${this.formatDuration(record.arrivalTime)})
        .fontSize(14)
        .fontColor('#666666');

Row() {

      Text(预计费用: ${this.calculateEstimatedFee(record)}元)
        .fontSize(16)
        .fontColor('#FF9800');
      
      Button('手动结算')
        .type(ButtonType.Capsule)
        .width(100)
        .height(30)
        .backgroundColor('#2196F3')
        .fontColor('#FFFFFF')
        .margin({ left: 20 })
        .onClick(() => {
          this.manualCheckout(record);
        });

.margin({ top: 10 });

.width(‘100%’)

  .padding(15)
  .backgroundColor('#FFFFFF')
  .borderRadius(10)
  .shadow({ radius: 5, color: '#E0E0E0', offsetX: 0, offsetY: 2 })
  .margin({ bottom: 10 });
})

@Builder

private buildCompletedRecords() {
List({ space: 10 }) {
ForEach(this.completedRecords, (record) => {
ListItem() {
Column() {
Row() {
Text(停车位: ${record.parkingId})
.fontSize(16)
.fontWeight(FontWeight.Bold)
.layoutWeight(1);

          Text({this.formatTime(record.arrivalTime)} - {this.formatTime(record.departureTime!)})
            .fontSize(12)
            .fontColor('#666666');

Row() {

          Text(费用: ${record.fee}元)
            .fontSize(16)
            .fontColor(record.isPaid ? '#4CAF50' : '#F44336');
          
          if (!record.isPaid) {
            Button('微信支付')
              .type(ButtonType.Capsule)
              .width(100)
              .height(30)
              .backgroundColor('#09BB07')
              .fontColor('#FFFFFF')
              .margin({ left: 20 })
              .onClick(() => {
                this.payWithWeChat(record);
              });

else {

            Text('已支付')
              .fontSize(14)
              .fontColor('#4CAF50')
              .margin({ left: 20 });

}

        .margin({ top: 10 });

.width(‘100%’)

      .padding(10)

.borderRadius(10)

    .backgroundColor('#FFFFFF')
    .shadow({ radius: 3, color: '#E0E0E0', offsetX: 0, offsetY: 1 });
  })

.width(‘100%’)

.height('40%');

private formatDuration(startTime: number): string {

const seconds = Math.floor((Date.now() - startTime) / 1000);
const hours = Math.floor(seconds / 3600);
const minutes = Math.floor((seconds % 3600) / 60);

return {hours}小时{minutes}分钟;

private formatTime(timestamp: number): string {

return new Date(timestamp).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });

private calculateEstimatedFee(record: ParkingRecord): number {

const durationHours = (Date.now() - record.arrivalTime) / (1000  60  60);
const hourlyRate = 5; // 5元/小时
return Math.ceil(durationHours * hourlyRate);

private async manualCheckout(record: ParkingRecord): Promise<void> {

// 标记为离开
const now = Date.now();
record.departureTime = now;
record.fee = this.calculateEstimatedFee(record);
record.isSynced = false;

// 同步数据
await this.parkingService.syncData();

// 通知微信小程序
await this.wechatService.syncParkingRecordsToWeChat([record]);

prompt.showToast({ message: '手动结算完成', duration: 2000 });
this.loadData();

private async payWithWeChat(record: ParkingRecord): Promise<void> {

try {
  // 调用微信支付接口
  const success = await this.wechatService.initiateWeChatPayment({
    recordId: record.recordId,
    amount: record.fee || 0,
    description: 停车费 - ${record.parkingId}
  });
  
  if (success) {
    record.isPaid = true;
    record.isSynced = false;
    
    // 同步数据
    await this.parkingService.syncData();
    
    prompt.showToast({ message: '支付成功', duration: 2000 });
    this.loadData();

else {

    prompt.showToast({ message: '支付失败', duration: 2000 });

} catch (e) {

  console.error(Failed to initiate WeChat payment. Code: {e.code}, message: {e.message});
  prompt.showToast({ message: '支付请求失败', duration: 2000 });

}

四、与游戏同步技术的结合点
实时状态同步：借鉴游戏中玩家状态实时同步机制，优化停车状态的跨设备同步

事件广播机制：类似游戏中的事件广播，实现停车事件的快速扩散

数据压缩传输：使用类似游戏中的网络优化技术，对停车数据进行高效传输

设备角色分配：参考游戏中的主机/客户端模式，确定主计费设备和从属设备

状态一致性保障：借鉴游戏中的状态同步机制，确保多设备间计费状态一致

五、关键特性实现
地磁传感器车辆检测：

  private detectVehicle(fieldStrength: number): boolean {
 // 实际应用中应使用更复杂的算法
 const baseStrength = 50; // 基准磁场强度 (μT)
 const threshold = 10; // 检测阈值
 
 // 使用滑动窗口滤波
 this.fieldStrengthHistory.push(fieldStrength);
 if (this.fieldStrengthHistory.length > 5) {
   this.fieldStrengthHistory.shift();

const avgStrength = this.fieldStrengthHistory.reduce((sum, val) => sum + val, 0) /

   this.fieldStrengthHistory.length;
 
 return Math.abs(avgStrength - baseStrength) > threshold;

动态计费策略：

  private calculateFee(record: ParkingRecord): number {
 if (!record.departureTime) return 0;
 
 const durationHours = (record.departureTime - record.arrivalTime) / (1000  60  60);
 
 // 动态计费策略
 const hour = new Date(record.arrivalTime).getHours();
 let hourlyRate = 5; // 默认5元/小时
 
 // 高峰时段加价
 if ((hour >= 7 && hour < 9) || (hour >= 17 && hour < 19)) {
   hourlyRate = 8; // 高峰时段8元/小时

// 夜间优惠

 else if (hour >= 22 || hour < 6) {
   hourlyRate = 3; // 夜间3元/小时

// 首小时优惠

 const firstHourRate = Math.min(durationHours, 1) * (hourlyRate - 2);
 const additionalHours = Math.max(durationHours - 1, 0) * hourlyRate;
 
 return Math.ceil(firstHourRate + additionalHours);

微信小程序联动支付：

  public async initiateWeChatPayment(params: {
 recordId: string;
 amount: number;
 description: string;

}): Promise<boolean> {
try {
const accessToken = await this.getWeChatAccessToken();
if (!accessToken) return false;

   const response = await this.sendRequest({
     url: ${this.API_BASE_URL}/pay/unifiedorder,
     method: 'POST',
     header: {
       'Content-Type': 'application/json',
       'Authorization': Bearer ${accessToken}
     },
     body: {
       out_trade_no: params.recordId,
       total_fee: params.amount * 100, // 转换为分
       body: params.description,
       trade_type: 'JSAPI',
       openid: await this.getCurrentUserOpenId()

});

   if (response.prepay_id) {
     // 返回支付参数给前端
     return true;

return false;

catch (e) {

   console.error(Failed to initiate payment. Code: {e.code}, message: {e.message});
   return false;

}

多设备状态同步：

  private async syncData(): Promise<void> {
 if (!this.kvStore) return;
 
 try {
   // 同步停车事件
   const unsyncedEvents = this.parkingEvents.filter(e => !e.isSynced);
   if (unsyncedEvents.length > 0) {
     await this.kvStore.put('parking_events', { value: unsyncedEvents });

// 同步停车记录

   const unsyncedRecords = this.parkingRecords.filter(r => !r.isSynced);
   if (unsyncedRecords.length > 0) {
     await this.kvStore.put('parking_records', { value: unsyncedRecords });

// 同步微信小程序状态

   const wechatRecords = this.parkingRecords.filter(r => 
     r.departureTime && !r.isPaid && !r.isSyncedToWeChat
   );
   
   if (wechatRecords.length > 0) {
     const success = await this.wechatService.syncParkingRecordsToWeChat(wechatRecords);
     if (success) {
       wechatRecords.forEach(r => r.isSyncedToWeChat = true);

}

catch (e) {

   console.error(Failed to sync data. Code: {e.code}, message: {e.message});

}

六、性能优化策略
传感器采样率自适应：

  private async adjustSensorRate(): Promise<void> {
 const batteryInfo = await power.getBatteryInfo();
 
 // 根据电量调整采样率
 if (batteryInfo.batterySoc < 20) {
   this.deviceStatus.sensorInterval = 500; // 低电量模式降低采样率

else {

   this.deviceStatus.sensorInterval = 100; // 正常采样率

// 重新初始化传感器

 if (this.geomagneticSensorId !== -1) {
   await sensor.off(this.geomagneticSensorId);
   this.geomagneticSensorId = await sensor.on(sensor.SensorId.GEOMAGNETIC_FIELD, {
     interval: this.deviceStatus.sensorInterval,
     callback: this.handleGeomagneticData
   });

}

本地缓存优先：

  public getActiveParkingRecords(): ParkingRecord[] {
 // 先从内存缓存读取
 return this.parkingRecords.filter(r => !r.departureTime);

批量数据处理：

  private async processBatchEvents(events: ParkingEvent[]): Promise<void> {
 // 使用任务池并行处理
 const task = new taskpool.Task(this.processEventsTask, events);
 const results = await taskpool.execute(task) as ParkingRecord[];
 
 // 合并处理结果
 results.forEach(record => {
   const existing = this.parkingRecords.find(r => r.recordId === record.recordId);
   if (!existing) {
     this.parkingRecords.push(record);

});

资源释放管理：

  public async destroy(): Promise<void> {
 if (this.geomagneticSensorId !== -1) {
   await sensor.off(this.geomagneticSensorId);
   this.geomagneticSensorId = -1;

if (this.kvStore) {

   this.kvStore.off('dataChange');

geoLocationManager.off(‘locationChange’);

七、项目扩展方向
车牌识别集成：结合摄像头实现车牌识别功能

多停车场管理：支持多个停车场的统一管理

预约停车功能：实现停车位预约和导航

会员积分系统：增加会员积分和优惠功能

数据分析报表：提供停车数据分析和报表功能

八、总结

本文实现的智能车辆停放计时系统具有以下特点：
采用地磁传感器精准检测车辆停放状态

实现动态计费策略，支持不同时段的差异化定价

与微信小程序深度联动，提供便捷的支付和查询功能

基于分布式数据同步，实现多终端协同管理

提供直观的用户界面和完整的停车管理功能

该应用展示了HarmonyOS在物联网领域的强大能力，特别是在传感器数据处理、分布式协同和支付集成方面的优势。通过借鉴游戏同步技术，实现了高效可靠的停车状态同步机制，为智能停车管理提供了完整的解决方案。