How to create barcode in wearable device

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Context

The barcode image generation capability can convert a string into a barcode image of a custom format.

Description

This capability can convert a string into a 1D code or 2D code of a custom format.

You can use this capability to convert a string into a contact barcode or a phone clone barcode, for example, converting string "HUAWEI" into a barcode.

Solution / Approach

@Entry
@Component
struct Index {
  @State pixelMap: image.PixelMap | undefined = undefined

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Button('generateBarcode Callback').onClick(() => {
        // Set parameters for generating a barcode image, for example, a QR code image.
        let content = 'huawei';
        let options: generateBarcode.CreateOptions = {
          scanType: scanCore.ScanType.QR_CODE,
          height: 400,
          width: 400
        }
        try {
        // Return a PixelMap-format barcode image.
          generateBarcode.createBarcode(content, options, (error: BusinessError, pixelMap: image.PixelMap) => {
            if (error) {
              hilog.error(0x0001, '[generateBarcode]',
                `Failed to get PixelMap by callback with options. Code: ${error.code}, message: ${error.message}`);
              return;
            }
            this.pixelMap = pixelMap;
          })
        } catch (error) {
          hilog.error(0x0001, '[generateBarcode]',
            `Failed to createBarcode by callback with options. Code: ${error.code}, message: ${error.message}`);
        }
      })
      // Display the obtained barcode image.
      if (this.pixelMap) {
        Image(this.pixelMap).width(300).height(300).objectFit(ImageFit.Contain)
      }
    }
    .width('100%')
    .height('100%')
  }
}

Key Takeaways

• The barcode image generation capability supports mobile phones, tablets, smart wearables (supported since 5.1.0(18)), 2-in-1 devices (supported since 5.1.1(19)), and TVs (supported since 5.1.1(19)).
• This capability can generate barcodes in 13 formats, and the generation parameters vary depending on the barcode format. The table below describes restrictions for each barcode format.

Written by Ataberk Celiktas