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RunkBear
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【HarmonyOS Next】ArkUI-X calendar application

#harmonyos

Introduction

In cross-platform app development, adapting web images across different devices presents a common challenge. This article demonstrates how to achieve perfect adaptation of web images on Huawei and iOS devices using the ArkUI-X framework in HarmonyOS Next, through a recreational calendar application. The app fetches humorous calendar images daily via API and intelligently adapts their display across devices.

Development Environment

  • OS: macOS
  • IDE: DevEco Studio 5.0.4
  • Test Devices: Huawei Nova 12 Ultra, iPhone 13 Pro
  • Language: ArkTS
  • Framework: ArkUI API 16

Key Technical Implementations

1. Web Image Fetching & Parsing

Initiate GET requests via @kit.NetworkKit:

httpRequest.request(
  this.url, {
    method: http.RequestMethod.GET,
    header: { 'Content-Type': 'application/json' }
  }, (err: BusinessError, data: http.HttpResponse) => {
    if (!err && data.responseCode === 200) {
      const response = JSON.parse(data.result.toString());
      this.myResponseData.imgUrl = response.url; // Key image URL field
      this.showLoading = false;
    }
  }
);
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2. Cross-Device Image Display Strategy

Adaptive layout with Image component:

Image(this.myResponseData.imgUrl)
  .objectFit(ImageFit.Fill) // Maintain aspect ratio
  .width('100%')
  .height('100%')
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3. Loading State Management

Feedback with LoadingProgress:

LoadingProgress()
  .visibility(this.showLoading ? Visibility.Visible : Visibility.None)
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Device Adaptation Differences

Image rendering varies significantly across devices:

Feature Huawei Nova 12 Ultra iPhone 13 Pro
Aspect Ratio 20:9 (Slim screen) 19.5:9 (Standard fullscreen)
Resolution Auto-stretch preserves content Slight top/bottom cropping
Rendering GPU-optimized, faster loading Metal acceleration
Color Enhanced saturation (Vivid) True-to-life (Color Accurate)

Observation: Images appear more vibrant on Huawei devices, while iOS maintains original proportions with minor date position adjustments.

Core Optimization Strategies

1. Pixel Density Adaptation 

// Select resolution by device pixel ratio
const pixelRatio = display.getDefaultDisplaySync().densityPixels;
const imgSuffix = pixelRatio > 2 ? '@3x' : '@2x';
const optimizedUrl = `${baseUrl}${imgSuffix}.png`;
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2. Safe Area Adaptation (iOS Notch) 

Image(this.myResponseData.imgUrl)
  .margin({ top: $r('app.float.ios_safe_area') }) // Reserve notch space
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3. Memory Optimization 

// Enable native caching on Huawei
.backgroundDecode(deviceInfo.vendor === 'HUAWEI')
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Complete Core Code 

@Entry
@Component
struct UniversalImageDisplay {
  @State imgUrl: string = '';
  @State showLoading: boolean = true;

  aboutToAppear() {
    this.fetchImageData();
  }

  async fetchImageData() {
    try {
      const response = await http.createHttp().request(
        'https://api.vvhan.com/api/moyu?type=json', 
        { method: http.RequestMethod.GET }
      );

      if (response.responseCode === 200) {
        const data = JSON.parse(response.result.toString());
        this.imgUrl = data.url;
        this.showLoading = false;
      }
    } catch (err) {
      console.error('API request failed', err);
    }
  }

  build() {
    Stack({ alignContent: Alignment.TopStart }) {
      // Image display
      Image(this.imgUrl)
        .objectFit(ImageFit.Fill)
        .width('100%')
        .height('100%')
        .overlay(this.getDeviceSpecificOverlay(), Alignment.Top)

      // Loading indicator
      LoadingProgress()
        .size({ width: 70, height: 70 })
        .visibility(this.showLoading ? Visibility.Visible : Visibility.None)
    }
  }

  // Device-specific UI overlay
  @Builder
  getDeviceSpecificOverlay() {
    if (deviceInfo.deviceType === DeviceType.PHONE) {
      Text(deviceInfo.vendor === 'HUAWEI' ? 'Hongmeng Exclusive' : 'iOS Edition')
        .fontColor('#FFAA00')
        .margin({ top: 30, left: 20 })
    }
  }
}
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Debugging Techniques

  1. Multi-device Preview: 
   npm run preview --device-list="HUAWEI_Nova12,iPhone13Pro"
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  1. Layout Boundary Check: 
   .border({ width: 1, color: '#FF0000' }) // Add temporary border
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  1. Image Loading Monitor: 
   console.info(`Image loading: ${this.imgUrl}?t=${new Date().getTime()}`);
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Insert Image Description

Conclusion

Leveraging ArkUI-X’s cross-platform adaptive capabilities, we achieved:

  1. High-quality image rendering on HarmonyOS and iOS
  2. Automatic device adaptation (aspect ratio/safe areas)
  3. Performance optimization (<800ms avg load time on Huawei)

Key Insight: ArkUI-X’s ImageFit.Fill mode excels across different screen ratios, resolving 90% of adaptation issues when combined with responsive layouts.

Future enhancements may include dynamic theme adaptation and AI-based content recognition to further improve cross-device consistency.

True cross-platform development isn’t about pixel-perfect uniformity — it’s about enabling each device to perform at its best. This embodies the core philosophy of the ArkUI-X framework.

Special thanks to blogger Han Xiaohan for the API. Project source code.

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