android 生成二维码 中间可以添加logo

package heafone.com.myjsonercodedemo; import android.graphics.Bitmap; import android.graphics.Canvas; 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 com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import java.io.FileOutputStream; import java.io.IOException; import java.util.HashMap; import java.util.Map; public class QRCodeUtil { /** * 生成二维码Bitmap * * @param content 内容 * @param widthPix 图片宽度 * @param heightPix 图片高度 * @param logoBm 二维码中心的Logo图标（可以为null） * @param filePath 用于存储二维码图片的文件路径 * @return 生成二维码及保存文件是否成功 */ public static boolean createQRImage(String content, int widthPix, int heightPix, Bitmap logoBm, String filePath) { try { if (content == null || "".equals(content)) { return false; } //配置参数 Map hints = new HashMap<>(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); //容错级别 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //设置空白边距的宽度 // hints.put(EncodeHintType.MARGIN, 2); //default is 4 // 图像数据转换，使用了矩阵转换 BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints); int[] pixels = new int[widthPix * heightPix]; // 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 y = 0; y < heightPix; y++) { for (int x = 0; x < widthPix; x++) { if (bitMatrix.get(x, y)) { pixels[y * widthPix + x] = 0xff000000; } else { pixels[y * widthPix + x] = 0xffffffff; } } } // 生成二维码图片的格式，使用ARGB_8888 Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix); if (logoBm != null) { bitmap = addLogo(bitmap, logoBm); } //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！ return bitmap != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath)); } catch (WriterException | IOException e) { e.printStackTrace(); } return false; } /** * 在二维码中间添加Logo图案 */ private static 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; } }