生成圆点二维码工具

序言

最近项目上需要生成圆点二维码图片的功能
就开发了一个工具用来生成圆点二维码。
支持不同大小，不同颜色。

效果

显示效果

识别效果

代码

依赖

只依赖zxing

implementation 'com.google.zxing:core:3.4.0'

CircularQRCodeUtil

package com.example.circular_qr_code;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.google.zxing.qrcode.encoder.ByteMatrix;
import com.google.zxing.qrcode.encoder.Encoder;
import com.google.zxing.qrcode.encoder.QRCode;

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

/** * <pre> * Created by zhuguohui * Date: 2023/5/26 * Time: 14:07 * Desc:用于生成圆形的二维码的工具 * </pre> */
public class CircularQRCodeUtil { 
   


    /** * 生成圆形二维码 * @param text 需要编码的文本 * @param width 生成图片的宽度 * @param height 生成图片的高度 * @param color 圆点的颜色 * @param quietZone 边距 * @return 生成好的二维码 * @throws WriterException */
    public static Bitmap generateQRCodeImage(String text, int width, int height, int color,int quietZone) throws WriterException { 
   
        final Map<EncodeHintType, Object> encodingHints = new HashMap<>();
        encodingHints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        QRCode code = Encoder.encode(text, ErrorCorrectionLevel.M, encodingHints);
        return renderQRImage(code, width, height, color,quietZone);
    }



    private static Bitmap renderQRImage(QRCode code, int width, int height,int color, int quietZone) { 
   
        Bitmap bitmap=Bitmap.createBitmap(width,height, Bitmap.Config.ARGB_8888);
        Canvas canvas=new Canvas(bitmap);
        Paint paint=new Paint();
        paint.setAntiAlias(true);
        paint.setColor(color);
        canvas.drawColor(Color.WHITE);

        ByteMatrix input = code.getMatrix();
        if (input == null) { 
   
            throw new IllegalStateException();
        }
        int inputWidth = input.getWidth();
        int inputHeight = input.getHeight();
        int qrWidth = inputWidth + (quietZone * 2);
        int qrHeight = inputHeight + (quietZone * 2);
        int outputWidth = Math.max(width, qrWidth);
        int outputHeight = Math.max(height, qrHeight);

        int multiple = Math.min(outputWidth / qrWidth, outputHeight / qrHeight);
        int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
        int topPadding = (outputHeight - (inputHeight * multiple)) / 2;
        final int FINDER_PATTERN_SIZE = 7;
        final float CIRCLE_SCALE_DOWN_FACTOR = 30f/30f;
        int circleSize = (int) (multiple * CIRCLE_SCALE_DOWN_FACTOR);
        float radius=circleSize*1.0f/2;
        int cxStep=multiple/2;

        for (int inputY = 0, outputY = topPadding; inputY < inputHeight; inputY++, outputY += multiple) { 
   
            for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) { 
   
                if (input.get(inputX, inputY) == 1) { 
   
                    if (!(inputX <= FINDER_PATTERN_SIZE && inputY <= FINDER_PATTERN_SIZE ||
                            inputX >= inputWidth - FINDER_PATTERN_SIZE && inputY <= FINDER_PATTERN_SIZE ||
                            inputX <= FINDER_PATTERN_SIZE && inputY >= inputHeight - FINDER_PATTERN_SIZE)) { 
   
                        int cx=outputX+cxStep;
                        int cy=outputY+cxStep;
                        canvas.drawCircle(cx,cy, radius,paint);
                    }
                }
            }
        }

        int circleDiameter = multiple * FINDER_PATTERN_SIZE;
        circleDiameter/=2;
        drawFinderPatternCircleStyle(canvas,paint,color, leftPadding, topPadding, circleDiameter);
        drawFinderPatternCircleStyle(canvas,paint, color,leftPadding + (inputWidth - FINDER_PATTERN_SIZE) * multiple, topPadding, circleDiameter);
        drawFinderPatternCircleStyle(canvas,paint, color,leftPadding, topPadding + (inputHeight - FINDER_PATTERN_SIZE) * multiple, circleDiameter);

        return bitmap;
    }

    private static void drawFinderPatternCircleStyle(Canvas canvas,Paint paint,int color, int x, int y, int circleDiameter) { 
   
        final int WHITE_CIRCLE_DIAMETER = circleDiameter*5/7;
        final int MIDDLE_DOT_DIAMETER = circleDiameter*3/7;
        x+=circleDiameter;
        y+=circleDiameter;
        paint.setColor(color);
        canvas.drawCircle(x, y, circleDiameter,paint);
        paint.setColor(Color.WHITE);
        canvas.drawCircle(x , y , WHITE_CIRCLE_DIAMETER,paint);
        paint.setColor(color);
        canvas.drawCircle(x , y , MIDDLE_DOT_DIAMETER,paint);
    }
}

用例

   ImageView ivCode2=findViewById(R.id.iv_code_2);
        try { 
   
            Bitmap bitmap = CircularQRCodeUtil.generateQRCodeImage("http://www.zhihu.com", 300, 300, Color.parseColor("#FF2A6F"), 0);
            ivCode2.setImageBitmap(bitmap);
        } catch (Exception e) { 
   
            throw new RuntimeException(e);
        }