Zxing生成二维码（可带图标）

SwetakeQRCode、BarCode4j、Zxing…… 生成二维码的开源项很多，在下不才只目前只了解这几个，
选择Zxing的原因可能是因为google吧，还一个就是Zxing网络上解决方案比较多

首先要在build.gradle中添加 compile ‘com.google.zxing:core:3.2.1’
Zxing官网地址点我

private void Create2QR2(String urls,ImageView imageView) {  String uri = urls;  int mScreenWidth = 0;  Bitmap bitmap;  try {  /**  * 获取屏幕信息的区别  * 只有activity可以使用WindowManager否则应该使用Context.getResources().getDisplayMetrics()来获取。  * Context.getResources().getDisplayMetrics()依赖于手机系统，获取到的是系统的屏幕信息；  * WindowManager.getDefaultDisplay().getMetrics(dm)是获取到Activity的实际屏幕信息。  */  DisplayMetrics dm = new DisplayMetrics();  aty.getWindowManager().getDefaultDisplay().getMetrics(dm);  mScreenWidth = dm.widthPixels;  bitmap = BitmapUtil.createQRImage(uri, mScreenWidth,  BitmapFactory.decodeResource(getResources(), R.mipmap.applogo));//自己写的方法  if (bitmap != null) {          imageView.setImageBitmap(bitmap);  }  } catch (Exception e) {                 e.printStackTrace();  }  }

//生成二维码图片（不带图片）public static Bitmap createQRCode(String url, int widthAndHeight)  throws WriterException {  Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();  hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  BitMatrix matrix = new MultiFormatWriter().encode(str,  BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);  int width = matrix.getWidth();  int height = matrix.getHeight();  int[] pixels = new int[width * height];  //画黑点  for (int y = 0; y < height; y++) {  for (int x = 0; x < width; x++) {  if (matrix.get(x, y)) {  pixels[y * width + x] = BLACK; //0xff000000  }  }  }  Bitmap bitmap = Bitmap.createBitmap(width, height,  Bitmap.Config.ARGB_8888);  bitmap.setPixels(pixels, 0, width, 0, 0, width, height);  return bitmap;  }

带图片的二维码public static Bitmap createQRImage(String content, int heightPix, Bitmap logoBm) {  try {// if (content == null || "".equals(content)) {// return false;// }  //配置参数  Map<EncodeHintType, Object> 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, heightPix, heightPix, hints);  int[] pixels = new int[heightPix * 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 < heightPix; x++) {  if (bitMatrix.get(x, y)) {  pixels[y * heightPix + x] = 0xff000000;  } else {  pixels[y * heightPix + x] = 0xffffffff;  }  }  }  // 生成二维码图片的格式，使用ARGB_8888  Bitmap bitmap = Bitmap.createBitmap(heightPix, heightPix, Bitmap.Config.ARGB_8888);  bitmap.setPixels(pixels, 0, heightPix, 0, 0, heightPix, 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;  } catch (WriterException e) {  e.printStackTrace();  }  return null;  }  /**  * 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;  }