Zxing生成自定义二维码样式
现在几乎每个app都带有二维码，但是google提供的zxing包，只给我们提供了核心的二维码算法，而开发过程中经常有自定义二维码的样式的需求，这时候我们就要自己写工具类封装。
先看效果图：
上源码：主要就一个QRUilt.class
“`
/**
* 二维码工具类
*/
public class QRUtils {
private static final int transparency = 0x00000000;
private static final int BLACK = 0xFF000000;
/*** 根据指定内容生成自定义宽高的二维码图片* <p>* param logoBm* logo图标* param content* 需要生成二维码的内容* param width* 二维码宽度* param height* 二维码高度* throws WriterException* 生成二维码异常*/public static Bitmap makeColorQRImage(String content, int QR_WIDTH) throws WriterException {int QR_HEIGHT = QR_WIDTH;try {// 图像数据转换，使用了矩阵转换Hashtable<EncodeHintType, Object> hints = new Hashtable<>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 容错率hints.put(EncodeHintType.MARGIN,0);//设置二维码白边的大小BitMatrix bitMatrix = new QRCodeWriter().encode(content,BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);int[] pixels = new int[QR_WIDTH * QR_HEIGHT];for (int y = 0; y < QR_HEIGHT; y++) {// 下面这里按照二维码的算法，逐个生成二维码的图片，//两个for循环是图片横列扫描的结果for (int x = 0; x < QR_WIDTH; x++) {if (bitMatrix.get(x, y)) {if (x < QR_WIDTH / 2 && y < QR_HEIGHT / 2) {pixels[y * QR_WIDTH + x] = 0xFF0094FF;// 蓝色Integer.toHexString(new Random().nextInt());} else if (x < QR_WIDTH / 2 && y > QR_HEIGHT / 2) {pixels[y * QR_WIDTH + x] = 0xFFFF0000;// 红色} else if (x > QR_WIDTH / 2 && y > QR_HEIGHT / 2) {pixels[y * QR_WIDTH + x] = 0xFF5ACF00;// 绿色} else {pixels[y * QR_WIDTH + x] = 0xFF000000;// 黑色}} else {pixels[y * QR_WIDTH + x] = 0x00ffffff;// 白色}}}// ------------------添加图片部分------------------//Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,Bitmap.Config.ARGB_8888);// 设置像素点bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);try {Canvas canvas = new Canvas(bitmap);canvas.drawBitmap(bitmap, 0, 0, null);canvas.save(Canvas.ALL_SAVE_FLAG);canvas.restore();return bitmap;} catch (Exception e) {bitmap = null;e.getStackTrace();}} catch (WriterException e) {e.printStackTrace();}return null;}/*** 获取十六进制的颜色代码.例如 "#6E36B4" , For HTML ,** @return String*/public static String getRandColorCode() {String r, g, b;Random random = new Random();r = Integer.toHexString(random.nextInt(256)).toUpperCase();g = Integer.toHexString(random.nextInt(256)).toUpperCase();b = Integer.toHexString(random.nextInt(256)).toUpperCase();r = r.length() == 1 ? "0" + r : r;g = g.length() == 1 ? "0" + g : g;b = b.length() == 1 ? "0" + b : b;return r + g + b;}/*** 从资源文件中获取图片转化成bitmap类型** @param context 上下文* @param drawableId 资源文件id* @return*/public static Bitmap gainBitmap(Context context, int drawableId) {Bitmap bmp = BitmapFactory.decodeResource(context.getResources(),drawableId);return bmp;}/*** 在图片右下角添加水印** @param srcBMP 原图* @param markBMP 水印88图片* @return 合成水印后的图片*/public static Bitmap composeWatermark(Bitmap srcBMP, Bitmap markBMP) {if (srcBMP == null) {return null;}// 创建一个新的和SRC长度宽度一样的位图Bitmap newb = Bitmap.createBitmap(srcBMP.getWidth(),srcBMP.getHeight(), Bitmap.Config.ARGB_8888);Canvas cv = new Canvas(newb);// 在 0，0坐标开始画入原图cv.drawBitmap(srcBMP, 0, 0, null);// 在原图的右下角画入水印cv.drawBitmap(markBMP, srcBMP.getWidth() - markBMP.getWidth() * 4 / 5,srcBMP.getHeight() * 2 / 7, null);// 保存cv.save(Canvas.ALL_SAVE_FLAG);// 存储cv.restore();return newb;}/*** 给二维码图片加背景*/public static Bitmap addBackground(Bitmap foreground, Bitmap background) {int fgWidth = foreground.getWidth();int fgHeight = foreground.getHeight();Bitmap newmap = Bitmap.createBitmap(fgWidth, fgHeight, Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(newmap);canvas.drawBitmap(resizeImage(background,fgWidth,fgHeight), 0, 0, null);canvas.drawBitmap(foreground, 0, 0, null);canvas.save(Canvas.ALL_SAVE_FLAG);canvas.restore();return newmap;}//使用Bitmap加Matrix来缩放public static Bitmap resizeImage(Bitmap bitmap, int w, int h){int width = bitmap.getWidth();int height = bitmap.getHeight();int newWidth = w;int newHeight = h;float scaleWidth = ((float) newWidth) / width;float scaleHeight = ((float) newHeight) / height;Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);// if you want to rotate the Bitmap// matrix.postRotate(45);Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width,height, matrix, true);return resizedBitmap;}//TODO 生成二维码public static Bitmap encodeToQRWidth(String contentsToEncode, int dimension) throws Exception {if (TextUtils.isEmpty(contentsToEncode)) return null;BarcodeFormat format = BarcodeFormat.QR_CODE;Map hints = new EnumMap(EncodeHintType.class);hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 容错率hints.put(EncodeHintType.MARGIN,0);//设置二维码白边的大小BitMatrix result = new MultiFormatWriter().encode(contentsToEncode, format, dimension, dimension, hints);int width = result.getWidth();int height = result.getHeight();boolean isFirstBlack = true;int startX = 0;int startY = 0;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] = result.get(x, y) ? BLACK : transparency;if (result.get(x, y) && isFirstBlack) {isFirstBlack = false;startX = x;startY = y;}}}Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);Matrix m = new Matrix();float sx = (width + 2f * startX) / width;float sy = (height + 2f * startY) / height;m.postScale(sx, sy);Bitmap qrBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(qrBitmap);canvas.translate(-startX, -startY);Paint paint = new Paint();paint.setAntiAlias(true);canvas.drawBitmap(bitmap, m, paint);canvas.save();return qrBitmap;}//生成带logo的二维码public static Bitmap encodeToQRWithLogo(String contentsToEncode, int dimension, Bitmap logo) throws Exception {return addLogo(encodeToQRWidth(contentsToEncode, dimension), logo);}//add logo on picprivate static Bitmap addLogo(Bitmap src, Bitmap logo) {if (src == null) {return null;}if (logo == null) {return src;}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;}//set logo width 1/5 of pic width.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;}
}
“`代码里面一些比较关键的技术点，都有比较详细的注释。y如果y
有什么问题的话，可以留言。我有看到都会解答的。
附录：demo下载地址：(/download/as4399/9772388)
