Smart Community Living App Development Based on HarmonyOS Next

Smart Community Living App Development Based on HarmonyOS Next

1. Application Scenario and Functional Planning

We will create a community living service app addressing residents' daily needs:

1. Smart Access Control: Mobile NFC emulates access cards
2. Community Bulletin System: Real-time notifications
3. Convenient Repair Service: Photo uploads for faulty equipment
4. Neighborhood Social Platform: Event registration and communication
5. Smart Parcel Lockers: QR code pickup and package tracking

Technical Architecture:

• Frontend: ArkUI + ArkTS
• Backend: AGC CloudDB + Cloud Storage + Push Messaging
• Device Integration: HarmonyOS Distributed Capabilities

---

2. Quick Project Setup

ohos create project CommunityLife --template empty:latest --model stage

Project Structure:

entry/src/main/
  ├── ets/
  │   ├── pages/       # Functional pages
  │   ├── components/  # Custom components
  │   ├── service/     # Service modules
  │   └── model/       # Data models
  ├── resources/       # Assets
  └── module.json5     # Configuration

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3. Core Function Implementation

1. NFC Smart Access (System Service Integration)

// service/DoorAccessService.ts
import { nfc } from '@ohos.nfc'; 
import { cardEmulation } from '@ohos.nfc.cardEmulation';

// Simulate access card
export function enableVirtualAccessCard() {
  try {
    const ceService = cardEmulation.getHceService();

    // Register access card AID
    ceService.registerAidsForService({
      type: cardEmulation.AidType.ACCESS,
      aids: ['F0010203040506']
    }).then(() => {
      console.info('Access card activated');
    });

    // Handle reader events
    ceService.on('hceCmd', (event) => {
      const response = new Uint8Array([0x90, 0x00]);
      ceService.sendResponse(response);
    });

  } catch (err) {
    console.error(`Activation failed: ${err.message}`);
  }
}

2. Community Bulletin System (CloudDB Integration)

// pages/NoticePage.ets
import { cloud } from '@agconnect/cloud';

@Entry
@Component
struct NoticePage {
  @State notices: Array<Notice> = [];

  loadNotices() {
    const query = cloud.cloudDB()
      .createQuery(Notice)
      .orderByDesc("publishTime");

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

  build() {
    Column() {
      List({ space: 10 }) {
        ForEach(this.notices, (item) => {
          ListItem() {
            Column() {
              Text(item.title).fontSize(18)
              Text(item.content).fontColor(Color.Gray)
              Text(`Published: ${new Date(item.publishTime).toLocaleString()}`)
            }
            .padding(15)
          }
        })
      }
    }
    .onAppear(() => this.loadNotices())
  }
}

3. Property Repair Service (Cloud Storage + OCR)

// pages/RepairPage.ets
import { cloud } from '@agconnect/cloud';
import { image } from '@ohos.multimedia.image';

@Component
struct RepairUploader {
  @State selectedImage?: image.PixelMap;

  async takeRepairPhoto() {
    try {
      const camera = await cameraManager.getCameraInstance();
      const photo = await camera.takePhoto();

      const compressed = await image.createImageSource(photo.uri)
        .createPixelMap({ desiredSize: { width: 800 } });

      this.selectedImage = compressed;

      const storage = cloud.storage();
      const fileRef = storage.ref(`repairs/${new Date().getTime()}.jpg`);
      await fileRef.put(compressed);

      analyzeRepairType(photo.uri); // OCR analysis
    } catch (err) {
      console.error('Upload failed', err);
    }
  }

  build() {
    Column() {
      if (this.selectedImage) {
        Image(this.selectedImage)
          .width('100%')
          .height(200)
      }

      Button('Report Issue')
        .onClick(() => this.takeRepairPhoto())
    }
  }
}

4. Neighborhood Social Platform (Real-time Messaging)

// service/CommunityChat.ts
import { cloud } from '@agconnect/cloud';
import { push } from '@agconnect/push';

export function initChatService() {
  push.on('message', (msg) => {
    showMessageNotification(msg);
  });

  push.subscribe('community_events');
}

export async function sendCommunityAlert(title: string, content: string) {
  const message = {
    title: title,
    body: content,
    data: { type: 'community_alert' }
  };

  await push.send({
    message: message,
    topic: 'all_residents'
  });
}

---

4. Complete Case: Community Event System

// pages/EventPage.ets
import { cloud } from '@agconnect/cloud';

@Entry
@Component
struct EventPage {
  @State events: Array<CommunityEvent> = [];
  @State joinedEvents: Set<string> = new Set();

  loadEvents() {
    const query = cloud.cloudDB()
      .createQuery(CommunityEvent)
      .whereGreaterThan('endTime', Date.now());

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

  joinEvent(eventId: string) {
    cloud.cloudDB().executeUpsert(new Participation({
      eventId: eventId,
      userId: getCurrentUser().uid
    })).then(() => {
      this.joinedEvents.add(eventId);
      console.log('Registration successful');
    });
  }

  build() {
    Column() {
      Text('Community Events').fontSize(24).margin(15)

      List() {
        ForEach(this.events, (event) => {
          ListItem() {
            Row() {
              Image(event.coverUrl).width(80).height(80)

              Column() {
                Text(event.title).fontSize(18)
                Text(`Date: ${new Date(event.startTime).toLocaleDateString()}`)
                Text(`Location: ${event.location}`)
              }

              if (!this.joinedEvents.has(event.id)) {
                Button('Join Now')
                  .onClick(() => this.joinEvent(event.id))
              } else {
                Text('Registered').fontColor(Color.Green)
              }
            }
            .padding(10)
          }
        })
      }
    }
    .onAppear(() => this.loadEvents())
  }
}

---

5. Performance Optimization

1. Lazy Data Loading

const query = cloud.cloudDB()
  .createQuery(Notice)
  .limit(10)
  .offset(this.notices.length);

1. Local Caching

import { dataStorage } from '@ohos.data.storage';

const storage = await dataStorage.getStorage('community_cache');
await storage.put('notices', JSON.stringify(this.notices));

1. Cross-device Coordination

import { distributedDeviceManager } from '@ohos.distributedHardware.deviceManager';

const deviceList = await distributedDeviceManager.getAvailableDeviceListSync();
deviceList[0].callMethod('openDoor', { doorId: 'main_gate' });

---

6. Testing and Deployment

Key Tests:

1. Access card simulation (requires NFC-enabled device)
2. Large file upload stability (50MB+ images)
3. Multi-device message synchronization

Cloud Configuration:

1. Enable CloudDB (CommunityDB) in AGC Console
2. Configure push certificates (iOS/Android)
3. Cloud Storage rules:

   {
     "rules": {
       "repairs": {
         "read": true,
         "write": "auth != null"
       }
     }
   }

---

Conclusion: HarmonyOS Advantages in Living Services

1. Seamless Device Integration: Real-time sync across phones/tablets/smart screens
2. Cloud Service Integration: One-stop backend solution with AGC
3. Peformance Excellence: Sub-second response with ArkTS engine

Extension Ideas:

• Community group buying system
• Smart waste sorting guide
• Home service booking