Android中生成彩色位置探测点的二维码

来源：互联网发布：淘宝店的信誉怎么算的编辑：程序博客网时间：2024/05/04 04:31

Android中生成彩色位置探测点的二维码

　　前段时间项目有需要要显示彩色探测点的二维码，网上搜了下，有基于java,c等的源码。网上的java源码直接照搬有些问题，自己改了改。不说废话，先上结果图。

　　原理其实很简单，利用zxing的写二维码功能生成二维码图片时，对相应像素点进行着色即可。关键是如何准确获取到二维码探测点在matrix里的位置。
　　

二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号）最高Version 40，(40-1)*4+21 = 177，所以最高是177 x 177 的正方形。……而三个角的探测点的长度相对来讲是固定的。

　　上面这段话是对二维码的尺寸规格的说明。另外，探测点在任何尺寸的二维码中，单边长度都是8个模块（包含外围的一条白边）。根据这些，我们就可以计算出探测点在像素矩阵中的具体位置了。

探测点长度说明

　　利用zxing生成二维码，是先生成Matrix，再由BarcodeEncoder转成Bitmap。看BarcodeEncoder中代码：

    public Bitmap createBitmap(BitMatrix matrix) {        int width = matrix.getWidth();        int height = matrix.getHeight();        int[] pixels = new int[width * height];        for (int y = 0; y < height; y++) {            int offset = y * width;            for (int x = 0; x < width; x++) {                pixels[offset + x] = matrix.get(x, y) ? BLACK : WHITE;            }        }        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);        return bitmap;    }

　　其中重要的一句

　　pixels[offset + x] = matrix.get(x, y) ? BLACK : WHITE;

　　根据矩阵中的0，1做颜色转换，由此我们可以自己来设定自己所需要的颜色。现在我们的任务就是确定探测点的准确位置。

确定生成的二维码探测点位置

　　
要想确定生成的二维码探测点位置，首先要确定生成的二维码的尺寸。看zxing中的QRCodeWriter类，其中

public BitMatrix encode(String contents,                      BarcodeFormat format,                      int width,                      int height,                      Map<EncodeHintType,?> hints) throws WriterException {if (contents.isEmpty()) {  throw new IllegalArgumentException("Found empty contents");}if (format != BarcodeFormat.QR_CODE) {  throw new IllegalArgumentException("Can only encode QR_CODE, but got " + format);}if (width < 0 || height < 0) {  throw new IllegalArgumentException("Requested dimensions are too small: " + width + 'x' +      height);}ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.L;int quietZone = QUIET_ZONE_SIZE;if (hints != null) {  ErrorCorrectionLevel requestedECLevel = (ErrorCorrectionLevel) hints.get(EncodeHintType.ERROR_CORRECTION);  if (requestedECLevel != null) {    errorCorrectionLevel = requestedECLevel;  }  Integer quietZoneInt = (Integer) hints.get(EncodeHintType.MARGIN);  if (quietZoneInt != null) {    quietZone = quietZoneInt;  }}QRCode code = Encoder.encode(contents, errorCorrectionLevel, hints);return renderResult(code, width, height, quietZone);}

主要是调用Encoder中的encode生成一个QRCode，再由renderResult方法生成一个BitMatrix。而生成的QRCode中包含了我们所需要的Version信息。所以我们可以自己改写一个QRCodeWriter类，拿到QRCode。直接将QRCodeWriter复制出来，重写几个方法即可。如我写的ColorQRCodeWriter：

public class ColorQRCodeWriter {private static final int QUIET_ZONE_SIZE = 4;public Map<String,Object> encode(String contents, BarcodeFormat format, int width, int height)        throws WriterException {    return encode(contents, format, width, height, null);}public Map<String,Object> encode(String contents,                                 BarcodeFormat format,                                 int width,                                 int height,                                 Map<EncodeHintType,?> hints) throws WriterException {    if (contents.isEmpty()) {        throw new IllegalArgumentException("Found empty contents");    }    if (format != BarcodeFormat.QR_CODE) {        throw new IllegalArgumentException("Can only encode QR_CODE, but got " + format);    }    if (width < 0 || height < 0) {        throw new IllegalArgumentException("Requested dimensions are too small: " + width + 'x' +                height);    }    ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.L;    int quietZone = QUIET_ZONE_SIZE;    if (hints != null) {        ErrorCorrectionLevel requestedECLevel = (ErrorCorrectionLevel) hints.get(EncodeHintType.ERROR_CORRECTION);        if (requestedECLevel != null) {            errorCorrectionLevel = requestedECLevel;        }        Integer quietZoneInt = (Integer) hints.get(EncodeHintType.MARGIN);        if (quietZoneInt != null) {            quietZone = quietZoneInt;        }    }    QRCode code = Encoder.encode(contents, errorCorrectionLevel, hints);    return renderResult(code, width, height, quietZone);}// Note that the input matrix uses 0 == white, 1 == black, while the output matrix uses// 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap).private static Map<String,Object> renderResult(QRCode code, int width, int height, int quietZone) {    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);    // Padding includes both the quiet zone and the extra white pixels to accommodate the requested    // dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.    // If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will    // handle all the padding from 100x100 (the actual QR) up to 200x160.    int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;    int topPadding = (outputHeight - (inputHeight * multiple)) / 2;    BitMatrix output = new BitMatrix(outputWidth, outputHeight);    for (int inputY = 0, outputY = topPadding; inputY < inputHeight; inputY++, outputY += multiple) {        // Write the contents of this row of the barcode        for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {            if (input.get(inputX, inputY) == 1) {                output.setRegion(outputX, outputY, multiple, multiple);            }        }    }    Map<String,Object> map=new HashMap<>();    map.put("BitMatrix",output);    map.put("Version",code.getVersion());    return map;}public Bitmap encodeBitmap(String content, int width, int height,boolean all){    return encodeBitmap(content,width,height,null,null,null,all);}/** * 生成基点颜色不同的图片 * @param content  需要生成的二维码的内容 * @param width     二维码宽 * @param height    二维码高 * @param topLeftColor    左基点颜色 * @param topRightColor    右顶基点颜色 * @param bottomLeftColor    左底基点颜色 * @return */public Bitmap encodeBitmap(String content, int width, int height,                           Integer topLeftColor, Integer topRightColor, Integer bottomLeftColor,boolean all){    try {        int startModel=2;        int endModel=5;        if(all){            startModel=0;            endModel=7;        }        Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");        hints.put(EncodeHintType.MARGIN, 1);        Map<String,Object> map= encode(content,BarcodeFormat.QR_CODE,width,height,hints);        BitMatrix matrix= (BitMatrix) map.get("BitMatrix");        Version version= (Version) map.get("Version");        int[] tl=matrix.getTopLeftOnBit();        int totalModelNum=(version.getVersionNumber()-1)*4+5+16;    //获取单边模块数        int resultWidth=width-2*(tl[0]);        int modelWidth=resultWidth/totalModelNum;   //得到每个模块长度        //得到三个基准点的起始与终点        int topEndX=tl[0]+modelWidth*endModel;        int topStartX=tl[0]+modelWidth*startModel;        int topStartY=tl[0]+modelWidth*startModel;        int topEndY=tl[0]+modelWidth*endModel;        int rightStartX=(totalModelNum-endModel)*modelWidth+tl[0];        int rightEndX=width-modelWidth*startModel-tl[0];        int leftStartY=height-modelWidth*endModel-tl[1];        int leftEndY=height-modelWidth*startModel-tl[1];        int[] pixels=new int[width*height];        for(int y=0;y<matrix.getHeight();y++){            for (int x = 0; x < matrix.getWidth(); x++) {                if(x>=topStartX&&x<topEndX&&y>=topStartY&&y<topEndY){                    //左上角颜色                    if(topLeftColor==null){                        topLeftColor= Color.RED;                    }                    pixels[y * width + x] = matrix.get(x, y) ? topLeftColor:  Color.WHITE;                }else if(x<rightEndX&&x>=rightStartX&&y>=topStartY&&y<topEndY){                    //右上角颜色                    if(topRightColor==null){                        topRightColor= Color.RED;                    }                    pixels[y * width + x] = matrix.get(x, y) ? topRightColor:  Color.WHITE;                }else if(x>=topStartX&&x<topEndX&&y>=leftStartY&&y<leftEndY){                    //右下角颜色                    if(bottomLeftColor==null){                        bottomLeftColor= Color.BLUE;                    }                    pixels[y * width + x] = matrix.get(x, y) ? bottomLeftColor:  Color.WHITE;                }else{                    pixels[y * width  + x] = matrix.get(x, y) ? Color.BLACK : Color.WHITE;                }            }        }        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);        return bitmap;    } catch (WriterException e) {        e.printStackTrace();    }    return null;}/** * 在二维码中间添加Logo图案 */public  Bitmap addLogo(Bitmap src, Bitmap logo) {    if (src == null) {        return null;    }    if (logo == null) {        return src;    }    //获取图片的宽高    int srcWidth = src.getWidth();    int srcHeight = src.getHeight();    int logoWidth = logo.getWidth();    int logoHeight = logo.getHeight();    if (srcWidth == 0 || srcHeight == 0) {        return null;    }    if (logoWidth == 0 || logoHeight == 0) {        return src;    }    //logo大小为二维码整体大小的1/5    float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;    Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);    try {        Canvas canvas = new Canvas(bitmap);        canvas.drawBitmap(src, 0, 0, null);        canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);        canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);        canvas.save(Canvas.ALL_SAVE_FLAG);        canvas.restore();    } catch (Exception e) {        bitmap = null;        e.getStackTrace();    }    return bitmap;}}

其中的addLogo方法直接从网上找的。

下面附上源码地址：下载地址请点击

1 0