鸿蒙5智能跳绳多屏显示系统开发指南 原创

鸿蒙5智能跳绳多屏显示系统开发指南

一、项目概述

本文基于HarmonyOS 5的分布式能力，开发一个智能跳绳多屏显示系统，借鉴《鸿蒙跨端U同步》中游戏多设备同步的技术原理，实现跳绳运动数据的实时采集和多设备同步显示。该系统包含跳绳手柄、智能手表和手机三个终端，能够实时同步跳绳次数、运动时长、卡路里消耗等数据。

二、系统架构

±--------------------+ ±--------------------+ ±--------------------+
跳绳手柄设备 <-----> 分布式数据总线 <-----> 手机/手表设备
(Jump Rope Device) (Distributed Bus) (Phone/Watch)
±---------±---------+ ±---------±---------+ ±---------±---------+

±---------v----------+ ±---------v----------+ ±---------v----------+
运动传感器采集模块 数据同步服务 多端显示引擎
(Sensor Module) (Sync Service) (Display Engine)

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

三、核心代码实现
跳绳数据模型

// src/main/ets/model/JumpRopeModel.ts
export class JumpRopeData {
deviceId: string; // 设备ID
sessionId: string; // 运动会话ID
timestamp: number; // 时间戳
jumpCount: number; // 跳绳次数
duration: number; // 运动时长(秒)
calories: number; // 卡路里消耗
speed: number; // 当前速度(次/分钟)
rhythm: number[]; // 节奏数据(最近10次间隔ms)

constructor(deviceId: string) {
this.deviceId = deviceId;
this.sessionId = this.generateSessionId();
this.timestamp = Date.now();
this.jumpCount = 0;
this.duration = 0;
this.calories = 0;
this.speed = 0;
this.rhythm = [];
private generateSessionId(): string {

return 'session_' + Math.random().toString(36).substring(2, 15);

addJump(timeInterval: number): void {

this.jumpCount++;
this.duration += timeInterval / 1000;

// 更新节奏数据(保留最近10次)
if (this.rhythm.length >= 10) {
  this.rhythm.shift();

this.rhythm.push(timeInterval);

// 计算当前速度(次/分钟)
if (this.rhythm.length > 1) {
  const avgInterval = this.rhythm.reduce((a, b) => a + b, 0) / this.rhythm.length;
  this.speed = Math.round(60000 / avgInterval);

// 计算卡路里(假设60kg体重)

this.calories = this.jumpCount * 0.1;
this.timestamp = Date.now();

toJson(): string {

return JSON.stringify({
  deviceId: this.deviceId,
  sessionId: this.sessionId,
  timestamp: this.timestamp,
  jumpCount: this.jumpCount,
  duration: this.duration,
  calories: this.calories,
  speed: this.speed,
  rhythm: this.rhythm
});

static fromJson(jsonStr: string): JumpRopeData {

const json = JSON.parse(jsonStr);
const data = new JumpRopeData(json.deviceId);
data.sessionId = json.sessionId;
data.timestamp = json.timestamp;
data.jumpCount = json.jumpCount;
data.duration = json.duration;
data.calories = json.calories;
data.speed = json.speed;
data.rhythm = json.rhythm;
return data;

}

分布式同步服务

// src/main/ets/service/DistributedSyncService.ts
import { distributedData, DistributedData } from ‘@ohos.data.distributedData’;
import { BusinessError } from ‘@ohos.base’;
import { JumpRopeData } from ‘…/model/JumpRopeModel’;
import { deviceManager } from ‘@ohos.distributedDeviceManager’;

export class DistributedSyncService {
private static instance: DistributedSyncService;
private kvManager: distributedData.KVManager;
private kvStore: distributedData.KVStore;
private readonly STORE_ID = ‘jump_rope_store’;
private readonly SYNC_KEY_PREFIX = ‘jump_’;
private subscribers: ((data: JumpRopeData) => void)[] = [];

private constructor() {
this.initDistributedData();
public static getInstance(): DistributedSyncService {

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

return DistributedSyncService.instance;

private initDistributedData(): void {

const config: distributedData.KVManagerConfig = {
  bundleName: 'com.example.jumprope',
  userInfo: {
    userId: '0',
    userType: distributedData.UserType.SAME_USER_ID

};

try {
  distributedData.createKVManager(config, (err: BusinessError, manager: distributedData.KVManager) => {
    if (err) {
      console.error(Failed to create KVManager. Code: {err.code}, message: {err.message});
      return;

this.kvManager = manager;

    const options: distributedData.Options = {
      createIfMissing: true,
      encrypt: true,
      backup: false,
      autoSync: true,
      kvStoreType: distributedData.KVStoreType.SINGLE_VERSION,
      schema: '',
      securityLevel: distributedData.SecurityLevel.S2
    };

    this.kvManager.getKVStore(this.SORE_ID, options, (err: BusinessError, store: distributedData.KVStore) => {
      if (err) {
        console.error(Failed to get KVStore. Code: {err.code}, message: {err.message});
        return;

this.kvStore = store;

      this.registerDataListener();
    });
  });

catch (e) {

  console.error(An unexpected error occurred. Code: {e.code}, message: {e.message});

}

private registerDataListener(): void {
try {
this.kvStore.on(‘dataChange’, distributedData.SubscribeType.SUBSCRIBE_TYPE_ALL, (data: distributedData.ChangeData) => {
if (data.key.startsWith(this.SYNC_KEY_PREFIX)) {
const jumpData = JumpRopeData.fromJson(data.value.value as string);
this.notifySubscribers(jumpData);
});

catch (e) {

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

}

public subscribe(callback: (data: JumpRopeData) => void): void {
this.subscribers.push(callback);
public unsubscribe(callback: (data: JumpRopeData) => void): void {

this.subscribers = this.subscribers.filter(sub => sub !== callback);

private notifySubscribers(data: JumpRopeData): void {

this.subscribers.forEach(callback => callback(data));

public syncJumpData(data: JumpRopeData): void {

if (!this.kvStore) {
  console.error('KVStore is not initialized');
  return;

try {

  const key = this.SYNC_KEY_PREFIX + data.sessionId;
  this.kvStore.put(key, data.toJson(), (err: BusinessError) => {
    if (err) {
      console.error(Failed to put data. Code: {err.code}, message: {err.message});

});

catch (e) {

  console.error(An unexpected error occurred. Code: {e.code}, message: {e.message});

}

跳绳手柄设备实现

// src/main/ets/device/JumpRopeDevice.ts
import { JumpRopeData } from ‘…/model/JumpRopeModel’;
import { DistributedSyncService } from ‘…/service/DistributedSyncService’;
import { sensor, SensorType, Sensor } from ‘@ohos.sensor’;
import { BusinessError } from ‘@ohos.base’;

export class JumpRopeDevice {
private sensor: Sensor | null = null;
private jumpData: JumpRopeData;
private lastJumpTime: number = 0;
private syncService: DistributedSyncService;

constructor() {
deviceManager.getLocalDeviceInfo((err: BusinessError, info) => {
if (!err) {
this.jumpData = new JumpRopeData(info.deviceId);
this.syncService = DistributedSyncService.getInstance();
this.initSensor();
});

private initSensor(): void {

try {
  sensor.on(SensorType.SENSOR_TYPE_ID_ACCELEROMETER, (data: sensor.AccelerometerResponse) => {
    // 简单的跳跃检测算法
    const acceleration = Math.sqrt(
      data.x * data.x + 
      data.y * data.y + 
      data.z * data.z
    );
    
    // 检测到加速度变化大于阈值且距离上次跳跃时间大于200ms
    const now = Date.now();
    if (acceleration > 15 && now - this.lastJumpTime > 200) {
      const interval = this.lastJumpTime > 0 ? now - this.lastJumpTime : 0;
      this.handleJump(interval);
      this.lastJumpTime = now;

});

  this.sensor = sensor.getDefaultSensor(SensorType.SENSOR_TYPE_ID_ACCELEROMETER);
  if (this.sensor) {
    this.sensor.setInterval(100000); // 100ms采样间隔
    this.sensor.run();

} catch (e) {

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

}

private handleJump(interval: number): void {
this.jumpData.addJump(interval);
this.syncService.syncJumpData(this.jumpData);
public stop(): void {

if (this.sensor) {
  this.sensor.stop();

}

手机端显示界面

// src/main/ets/pages/PhoneDisplay.ets
import { JumpRopeData } from ‘…/model/JumpRopeModel’;
import { DistributedSyncService } from ‘…/service/DistributedSyncService’;

@Entry
@Component
struct PhoneDisplay {
@State currentData: JumpRopeData | null = null;
@State sessionStartTime: number = 0;
@State isSessionActive: boolean = false;
private syncService: DistributedSyncService;

aboutToAppear(): void {
this.syncService = DistributedSyncService.getInstance();
this.syncService.subscribe(this.handleJumpData.bind(this));
aboutToDisappear(): void {

this.syncService.unsubscribe(this.handleJumpData.bind(this));

private handleJumpData(data: JumpRopeData): void {

if (!this.isSessionActive) {
  this.isSessionActive = true;
  this.sessionStartTime = data.timestamp;

this.currentData = data;

private formatTime(seconds: number): string {

const mins = Math.floor(seconds / 60);
const secs = Math.floor(seconds % 60);
return {mins.toString().padStart(2, '0')}:{secs.toString().padStart(2, '0')};

build() {

Column() {
  if (this.currentData) {
    // 顶部状态栏
    Row() {
      Text(会话ID: ${this.currentData.sessionId.substring(0, 8)})
        .fontSize(12)
        .opacity(0.7)
      
      Text(设备: ${this.currentData.deviceId.substring(0, 6)})
        .fontSize(12)
        .opacity(0.7)
        .margin({left: 10})

.width(‘100%’)

    .justifyContent(FlexAlign.SpaceBetween)
    .margin({bottom: 20})

    // 主数据显示
    Stack() {
      // 背景圆环
      Circle({ width: 280, height: 280 })
        .fill('#1a2a6c')
        .stroke('#FFFFFF')
        .strokeWidth(2)
      
      // 跳绳次数
      Column() {
        Text('跳绳次数')
          .fontSize(18)
          .margin({bottom: 5})
        
        Text(this.currentData.jumpCount.toString())
          .fontSize(48)
          .fontWeight(FontWeight.Bold)
          .fontColor('#FF5722')
        
        Text(速度: ${this.currentData.speed} 次/分钟)
          .fontSize(16)
          .margin({top: 15})

.alignItems(HorizontalAlign.Center)

.margin({bottom: 30})

    // 次要数据
    Row() {
      Column() {
        Text('运动时长')
          .fontSize(14)
        Text(this.formatTime(this.currentData.duration))
          .fontSize(20)
          .fontColor('#2196F3')
          .margin({top: 5})

.margin({right: 20})

      Column() {
        Text('卡路里')
          .fontSize(14)
        Text(${this.currentData.calories.toFixed(1)} kcal)
          .fontSize(20)
          .fontColor('#4CAF50')
          .margin({top: 5})

}

    .margin({bottom: 30})

    // 节奏图表
    Text('最近10次跳跃节奏(ms)')
      .fontSize(14)
      .margin({bottom: 10})
    
    Row() {
      ForEach(this.currentData.rhythm, (interval, index) => {
        Column() {
          Text(interval.toString())
            .fontSize(10)
          
          Rect()
            .width(20)
            .height(interval / 5)
            .fill(index % 2 === 0 ? '#FF9800' : '#FFC107')
            .margin({top: 5})

.margin({right: 5})

      })

.height(100)

else {

    Text('等待跳绳数据...')
      .fontSize(18)
      .margin({top: 100})

}

.width('100%')
.height('100%')
.padding(20)
.backgroundColor('#F5F5F5')

}

手表端显示界面

// src/main/ets/pages/WatchDisplay.ets
import { JumpRopeData } from ‘…/model/JumpRopeModel’;
import { DistributedSyncService } from ‘…/service/DistributedSyncService’;

@Entry
@Component
struct WatchDisplay {
@State currentData: JumpRopeData | null = null;
private syncService: DistributedSyncService;

aboutToAppear(): void {
this.syncService = DistributedSyncService.getInstance();
this.syncService.subscribe(this.handleJumpData.bind(this));
aboutToDisappear(): void {

this.syncService.unsubscribe(this.handleJumpData.bind(this));

private handleJumpData(data: JumpRopeData): void {

this.currentData = data;

build() {

Column() {
  if (this.currentData) {
    // 圆形表盘设计
    Stack() {
      Circle({ width: '100%', height: '100%' })
        .fill('#1a2a6c')
        .stroke('#FFFFFF')
        .strokeWidth(1)
      
      Column() {
        Text(this.currentData.jumpCount.toString())
          .fontSize(36)
          .fontWeight(FontWeight.Bold)
          .fontColor('#FFFFFF')
        
        Text('次')
          .fontSize(14)
          .fontColor('#FFFFFF')
          .margin({top: -10})
        
        Text(${this.currentData.speed} 次/分钟)
          .fontSize(12)
          .fontColor('#FFC107')
          .margin({top: 10})

}

    // 底部状态栏
    Row() {
      Text(${this.currentData.calories.toFixed(0)} kcal)
        .fontSize(12)
        .fontColor('#4CAF50')
      
      Text({Math.floor(this.currentData.duration / 60)}:{Math.floor(this.currentData.duration % 60).toString().padStart(2, '0')})
        .fontSize(12)
        .fontColor('#2196F3')
        .margin({left: 15})

.margin({top: 20})

else {

    Text('等待跳绳数据...')
      .fontSize(14)
      .fontColor('#FFFFFF')

}

.width('100%')
.height('100%')
.padding(10)
.backgroundColor('#000000')

}

四、与游戏同步技术的结合点
实时数据同步机制：借鉴游戏中玩家状态同步技术，实现毫秒级跳绳数据同步

分布式设备发现：使用游戏中的设备发现机制自动连接跳绳手柄和显示设备

数据压缩传输：采用游戏中的高效数据压缩算法，减少无线传输数据量

低延迟优化：应用游戏中的网络延迟优化策略，确保数据实时性

多设备渲染同步：类似游戏多屏显示技术，保持不同设备显示内容同步

五、关键特性实现
多设备协同：

  // 设备能力协商

import { deviceManager } from ‘@ohos.distributedDeviceManager’;

const devices = deviceManager.getTrustedDeviceListSync();
devices.forEach(device => {
if (device.deviceType === ‘smartWatch’) {
// 优化手表端显示格式
else if (device.deviceType === ‘phone’) {

   // 启用手机端完整功能

});

高效传感器数据处理：

  // 使用Worker线程处理传感器数据

const worker = new worker.ThreadWorker(‘ets/workers/SensorWorker.ts’);
worker.onmessage = (data: sensor.AccelerometerResponse) => {
// 处理跳跃检测
};

自适应UI布局：

  // 根据设备类型调整UI

@Builder AdaptUI(data: JumpRopeData) {
if (device.deviceType === ‘smartWatch’) {
// 手表UI
else {

   // 手机/平板UI

}

数据持久化：

  // 使用分布式数据库存储历史记录

const kvManager = distributedData.createKVManager(config);
const options = {
createIfMissing: true,
encrypt: true,
backup: false,
autoSync: true
};

六、性能优化策略
传感器采样率动态调整：

  // 根据运动状态调整采样率

if (this.currentData.speed > 150) {
this.sensor.setInterval(50000); // 50ms高频率
else {

 this.sensor.setInterval(100000); // 100ms普通频率

数据批量同步：

  // 高频数据批量处理

private batchTimer: number = 0;
private batchData: JumpRopeData[] = [];

private addToBatch(data: JumpRopeData): void {
this.batchData.push(data);
if (!this.batchTimer) {
this.batchTimer = setTimeout(() => {
this.syncBatchData();
this.batchTimer = 0;
}, 200); // 每200ms批量同步一次
}

设备端差异化处理：

  // 手表端简化数据处理

if (device.deviceType === ‘smartWatch’) {
this.syncService.subscribe((data) => {
this.currentData = {
…data,
rhythm: [] // 手表不需要节奏数据
};
});

七、项目扩展方向
多人跳绳模式：实现多人跳绳比赛数据同步和排名

训练计划：制定个性化跳绳训练计划并同步到各设备

健康数据分析：长期跟踪分析跳绳运动数据

AR跳绳游戏：结合AR技术开发互动跳绳游戏

社交分享：将运动成绩分享到社交平台

八、总结

本智能跳绳多屏显示系统实现了以下核心功能：
跳绳手柄的高精度运动检测

运动数据的实时多设备同步

手机和手表端的差异化显示

高效的数据传输和处理

直观的数据可视化展示

通过借鉴游戏中的多设备同步技术，我们构建了一个低延迟、高可靠的智能跳绳系统。该项目展示了HarmonyOS分布式能力在运动健康领域的创新应用，为开发者提供了实现多设备协同应用的参考方案。