Android 生成二维码

一、生成二维码工具类封装

1、二维码库

  // 二维码implementation 'com.journeyapps:zxing-android-embedded:4.3.0'

2、工具类


/*** 二维码* 处理工具*/public class QRCodeDealUtils {/*** @param content     字符串内容* @param size        位图宽&高(单位:px)* @param logo        二维码logo* @param logoPercent 二维码logo的占比 [0,1]* @return*/public static Bitmap createQRCodeBitmapLogo(String content, int size, Bitmap logo, float logoPercent) {Bitmap qrCodeBitmap = null;Bitmap bitmap;try {// 不带logo二维码qrCodeBitmap = generateQRCodeWithoutMargin(content, size, size);// 带logo 二维码bitmap = addLogoToQRCode(qrCodeBitmap, logo, logoPercent);} catch (WriterException e) {throw new RuntimeException(e);}return bitmap;}/*** 生成* 无白色边框* 二维码*/public static Bitmap generateQRCodeWithoutMargin(String text, int width, int height) throws WriterException {QRCodeWriter qrCodeWriter = new QRCodeWriter();Map<EncodeHintType, Object> hints = new HashMap<>();hints.put(EncodeHintType.MARGIN, 0); // 设置边距为0BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);int[] pixels = new int[width * height];for (int y = 0; y < height; y++) {for (int x = 0; x < width; x++) {if (bitMatrix.get(x, y)) {pixels[y * width + x] = Color.BLACK; // 黑色像素} else {pixels[y * width + x] = Color.TRANSPARENT; // 透明像素，去除白边}}}Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;}/*** 给二维码* 添加logo*/public static Bitmap addLogoToQRCode(Bitmap srcBitmap, Bitmap logoBitmap, float logoPercent) {// 计算Logo相对于二维码的尺寸int logoWidth = Math.round(srcBitmap.getWidth() * logoPercent);int logoHeight = Math.round(srcBitmap.getHeight() * logoPercent);// 确保Logo尺寸不会超过二维码尺寸if (logoWidth > srcBitmap.getWidth() || logoHeight > srcBitmap.getHeight()) {throw new IllegalArgumentException("Logo size is too large for the QR code.");}// 创建一个新的Bitmap来保存带Logo的二维码Bitmap resultBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());Canvas canvas = new Canvas(resultBitmap);// 绘制原始二维码canvas.drawBitmap(srcBitmap, 0, 0, null);// 创建一个Matrix对象来缩放LogoMatrix matrix = new Matrix();matrix.postScale(logoWidth / (float) logoBitmap.getWidth(),logoHeight / (float) logoBitmap.getHeight());// 计算Logo应该放置的位置（中心）int xOffset = (srcBitmap.getWidth() - logoWidth) / 2;int yOffset = (srcBitmap.getHeight() - logoHeight) / 2;// 在二维码上绘制Logocanvas.drawBitmap(logoBitmap, xOffset, yOffset, null);return resultBitmap;}}

二、方法说明

1、不带logo

   /*** 生成* 无白色边框* 二维码*/public static Bitmap generateQRCodeWithoutMargin(String text, int width, int height) throws WriterException {QRCodeWriter qrCodeWriter = new QRCodeWriter();Map<EncodeHintType, Object> hints = new HashMap<>();hints.put(EncodeHintType.MARGIN, 0); // 设置边距为0BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);int[] pixels = new int[width * height];for (int y = 0; y < height; y++) {for (int x = 0; x < width; x++) {if (bitMatrix.get(x, y)) {pixels[y * width + x] = Color.BLACK; // 黑色像素} else {pixels[y * width + x] = Color.TRANSPARENT; // 透明像素，去除白边}}}Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;}

2、给二维码添加logo的方法

   /*** 给二维码* 添加logo*/public static Bitmap addLogoToQRCode(Bitmap srcBitmap, Bitmap logoBitmap, float logoPercent) {// 计算Logo相对于二维码的尺寸int logoWidth = Math.round(srcBitmap.getWidth() * logoPercent);int logoHeight = Math.round(srcBitmap.getHeight() * logoPercent);// 确保Logo尺寸不会超过二维码尺寸if (logoWidth > srcBitmap.getWidth() || logoHeight > srcBitmap.getHeight()) {throw new IllegalArgumentException("Logo size is too large for the QR code.");}// 创建一个新的Bitmap来保存带Logo的二维码Bitmap resultBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());Canvas canvas = new Canvas(resultBitmap);// 绘制原始二维码canvas.drawBitmap(srcBitmap, 0, 0, null);// 创建一个Matrix对象来缩放LogoMatrix matrix = new Matrix();matrix.postScale(logoWidth / (float) logoBitmap.getWidth(),logoHeight / (float) logoBitmap.getHeight());// 计算Logo应该放置的位置（中心）int xOffset = (srcBitmap.getWidth() - logoWidth) / 2;int yOffset = (srcBitmap.getHeight() - logoHeight) / 2;// 在二维码上绘制Logocanvas.drawBitmap(logoBitmap, xOffset, yOffset, null);return resultBitmap;}

3、调用方式

/*** @param content     字符串内容* @param size        位图宽&高(单位:px)* @param logo        二维码logo* @param logoPercent 二维码logo的占比 [0,1]* @return*/public static Bitmap createQRCodeBitmapLogo(String content, int size, Bitmap logo, float logoPercent) {Bitmap qrCodeBitmap = null;Bitmap bitmap;try {// 不带logo二维码qrCodeBitmap = generateQRCodeWithoutMargin(content, size, size);// 带logo 二维码bitmap = addLogoToQRCode(qrCodeBitmap, logo, logoPercent);} catch (WriterException e) {throw new RuntimeException(e);}return bitmap;}

到此结束