HarmonyOS 鸿蒙Next条形码生成示例

HarmonyOS鸿蒙Next中生成条形码可以使用Zxing库。首先，在build.gradle文件中添加依赖：

dependencies {
    implementation 'com.google.zxing:core:3.4.1'
}

接着，创建一个工具类BarcodeUtil，用于生成条形码：

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import ohos.agp.components.Image;
import ohos.agp.render.Canvas;
import ohos.agp.render.PixelMapHolder;
import ohos.media.image.PixelMap;
import ohos.media.image.PixelMapInitializer;

import java.util.HashMap;
import java.util.Map;

public class BarcodeUtil {
    public static PixelMap generateBarcode(String data, int width, int height) {
        QRCodeWriter writer = new QRCodeWriter();
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

        try {
            BitMatrix bitMatrix = writer.encode(data, BarcodeFormat.CODE_128, width, height, hints);
            PixelMap pixelMap = PixelMapInitializer.create(width, height);
            Canvas canvas = new Canvas(new PixelMapHolder(pixelMap));

            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    if (bitMatrix.get(x, y)) {
                        canvas.drawPixel(x, y, Color.BLACK.getValue());
                    } else {
                        canvas.drawPixel(x, y, Color.WHITE.getValue());
                    }
                }
            }

            return pixelMap;
        } catch (WriterException e) {
            e.printStackTrace();
            return null;
        }
    }
}

最后，在UI中显示生成的条形码：

Image barcodeImage = (Image) findComponentById(ResourceTable.Id_barcode_image);
PixelMap barcodePixelMap = BarcodeUtil.generateBarcode("123456789", 300, 150);
barcodeImage.setPixelMap(barcodePixelMap);

此示例展示了如何在HarmonyOS鸿蒙Next中生成并显示条形码。