Smart Healthcare App Development Based on HarmonyOS Next: Health Data Monitoring and Cloud Synchronization

Smart Healthcare App Development Based on HarmonyOS Next: Health Data Monitoring and Cloud Synchronization

1. Scenario Overview and Functional Design

We will develop a health management app for hypertension patients, featuring:

1. Local blood pressure data collection (simulating hardware)
2. Encrypted health data storage
3. Multi-device data synchronization (via AppGallery Connect CloudDB)
4. Real-time abnormal data alerts

Tech Stack:

• Frontend: ArkUI + ArkTS
• Backend: AGC CloudDB + Cloud Functions
• Security: HarmonyOS Key Management

---

2. Environment Setup and Project Structure

# Create project  
ohos create project HealthMonitor --template empty:latest --model stage  

Project Structure:

resources/          # Resource files  
entry/src/main/  
  ├── ets/          
  │   ├── pages/    # Pages  
  │   ├── model/    # Data models  
  │   └── utils/    # Utilities  
  └── module.json5  # Configuration  

---

3. Core Module Implementation

1. Blood Pressure Data Model (ArkTS)

// model/BloodPressure.ts  
import { hilog } from '@kit.PerformanceAnalysisKit';  

export class BloodPressure {  
  systolic: number;  // Systolic pressure  
  diastolic: number; // Diastolic pressure  
  pulse: number;     // Heart rate  
  timestamp: number; // Timestamp  

  constructor(systolic: number, diastolic: number, pulse: number) {  
    this.systolic = systolic;  
    this.diastolic = diastolic;  
    this.pulse = pulse;  
    this.timestamp = new Date().getTime();  
  }  

  // Check hypertension (medical standard)  
  isHypertension(): boolean {  
    return this.systolic >= 140 || this.diastolic >= 90;  
  }  
}  

2. Local Data Collection UI

// pages/MeasurePage.ets  
import { BloodPressure } from '../model/BloodPressure';  

@Entry  
@Component  
struct MeasurePage {  
  @State currentBP: BloodPressure = new BloodPressure(0, 0, 0);  

  // Simulate Bluetooth device data  
  simulateDeviceData() {  
    setInterval(() => {  
      // Generate random BP data (systolic: 100-160, diastolic: 60-100)  
      const sys = Math.floor(Math.random() * 60) + 100;  
      const dia = Math.floor(Math.random() * 40) + 60;  
      const pulse = Math.floor(Math.random() * 40) + 60;  

      this.currentBP = new BloodPressure(sys, dia, pulse);  
    }, 3000);  
  }  

  build() {  
    Column() {  
      // Real-time data display  
      Text(`Current: ${this.currentBP.systolic}/${this.currentBP.diastolic}`)  
        .fontSize(30)  
        .margin(20)  

      // Alert  
      if (this.currentBP.isHypertension()) {  
        Text("WARNING: High Blood Pressure!")  
          .fontColor(Color.Red)  
          .fontSize(20)  
      }  

      // Save button  
      Button("Save Record")  
        .onClick(() => {  
          saveToLocalDB(this.currentBP);  
        })  
    }  
    .onAppear(() => this.simulateDeviceData())  
  }  
}  

3. Encrypted Storage (HarmonyOS Security)

// utils/SecureStorage.ts  
import { cryptoFramework } from '@kit.CryptoArchitectureKit';  
import { BusinessError } from '@kit.BasicServicesKit';  

const ALGORITHM = "AES256";  

export async function encryptData(data: string): Promise<Uint8Array> {  
  try {  
    const generator = cryptoFramework.createSymKeyGenerator(ALGORITHM);  
    const key = await generator.convertKey({  
      data: new Uint8Array(32) // Get from key management in production  
    }, null);  

    const cipher = cryptoFramework.createCipher(ALGORITHM);  
    await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, key, null);  

    const input: cryptoFramework.DataBlob = { data: new TextEncoder().encode(data) };  
    return (await cipher.doFinal(input)).data;  
  } catch (err) {  
    throw new Error(`Encryption failed: ${(err as BusinessError).message}`);  
  }  
}  

4. Cloud Synchronization (AppGallery Connect)

Step 1: Create CloudDB in AGC Console

• Object Type: HealthRecord
• Fields: id(string), systolic(int), diastolic(int), timestamp(long)

Step 2: Integrate AGC SDK

// cloud/CloudDBManager.ts  
import { cloud } from '@agconnect/cloud';  

// Cloud object model  
@Class  
export class HealthRecord {  
  @Field()  
  id: string = "";  

  @Field()  
  systolic: number = 0;  

  @Field()  
  diastolic: number = 0;  

  @Field()  
  timestamp: number = 0;  
}  

// Sync method  
export async function syncToCloud(bp: BloodPressure) {  
  try {  
    const record = new HealthRecord();  
    record.id = generateUUID();  
    record.systolic = bp.systolic;  
    record.diastolic = bp.diastolic;  
    record.timestamp = bp.timestamp;  

    const cloudDB = cloud.cloudDB({ zoneName: "HealthZone" });  
    await cloudDB.executeUpsert(record);  

    console.log("Sync succeeded");  
  } catch (err) {  
    console.error(`Sync failed: ${err.message}`);  
  }  
}  

5. Alert System (Cloud Function)

AGC Cloud Function:

// health-alarm-function.js  
exports.handler = async (event) => {  
  const record = event.data;  

  if (record.systolic >= 140 || record.diastolic >= 90) {  
    sendEmergencyAlert({  
      userId: record.userId,  
      message: `Abnormal BP: ${record.systolic}/${record.diastolic}`  
    });  
  }  
  return { code: 0 };  
};  

---

4. Complete Case: Family Blood Pressure Dashboard

// pages/DashboardPage.ets  
import { HealthRecord } from '../cloud/CloudDBManager';  

@Entry  
@Component  
struct Dashboard {  
  @State records: HealthRecord[] = [];  

  // Load cloud data  
  loadCloudData() {  
    const query = cloud.cloudDB()  
      .createQuery(HealthRecord)  
      .orderByDesc("timestamp");  

    cloud.cloudDB().executeQuery(query).then(result => {  
      this.records = result.getSnapshotObjects();  
    });  
  }  

  // Visualize data  
  buildChart() {  
    ForEach(this.records, (item) => {  
      Line().point({ x: item.timestamp, y: item.systolic })  
            .strokeWidth(3)  
    })  
  }  

  build() {  
    Column() {  
      Text("Family Blood Pressure Dashboard")  
        .fontSize(26)  
        .margin(20)  

      this.buildChart()  

      List() {  
        ForEach(this.records, (item) => {  
          ListItem() {  
            Text(`${new Date(item.timestamp).toLocaleString()}  
                  | Systolic:${item.systolic} Diastolic:${item.diastolic}`)  
          }  
        })  
      }  
    }  
    .onAppear(() => this.loadCloudData())  
  }  
}  

---

5. Optimization Techniques

1. Cross-device Sync

// Listen for data changes  
cloud.cloudDB().on("upsert", (event) => {  
  event.getSnapshotObjects().forEach(updateUI);  
});  

1. Low-power Mode

import { backgroundTaskManager } from '@kit.AbilityKit';  

backgroundTaskManager.requestSuspendDelay().then(delayId => {  
  collectEmergencyData(); // Run in background  
});  

1. Security Compliance
2. Biometric auth via @ohos.userIAM.userAuth
3. Medical data encryption with @ohos.security.huks

---

6. Deployment and Testing

Testing Process:

1. Simulate data collection on emulator
2. Test multi-device sync on real devices
3. Verify cloud triggers in AGC Console

Performance Metrics:

• Encryption time < 50ms
• Cloud sync latency < 1s
• Memory usage < 80MB

---

Conclusion: HarmonyOS Advantages in Healthcare

1. Distributed Architecture: Seamless data flow across devices (phones/watches/tablets)
2. End-Cloud Collaboration: AGC provides compliant medical cloud storage
3. Hardware-backed Security: CC EAL5+ certified encryption system