Android之二维码的生成

public class BitmapUtil {

  /**
  * 生成一个二维码图像
  *
  * @param url
  * 传入的字符串,通常是一个URL
  * @param QR_WIDTH
  * 宽度(像素值px)
  * @param QR_HEIGHT
  * 高度(像素值px)
  * @return bitmap
  */
  public static final Bitmap create2DCoderBitmap(String url, int QR_WIDTH,int QR_HEIGHT) {
    try {
      // 判断URL合法性
      if (url == null || "".equals(url) || url.length() < 1) {
        return null;
      }
      Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
      hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
      // 图像数据转换,使用了矩阵转换
      BitMatrix bitMatrix = new QRCodeWriter().encode(url,
      BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
      int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
      // 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 < QR_HEIGHT; y++) {
        for (int x = 0; x < QR_WIDTH; x++) {
          if (bitMatrix.get(x, y)) {
            pixels[y * QR_WIDTH + x] = 0xff000000;
          } else {
            pixels[y * QR_WIDTH + x] = 0xffffffff;
          }
        }
      }
      // 生成二维码图片的格式,使用ARGB_8888
      Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
      Bitmap.Config.ARGB_8888);
      bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);
      // 显示到一个ImageView上面
      // sweepIV.setImageBitmap(bitmap);
      return bitmap;
    } catch (WriterException e) {
      //Log.i("log", "生成二维码错误" + e.getMessage());
      return null;
    }
  }

  private static final int BLACK = 0xff000000;

  /**
  * 生成一个二维码图像
  *@param str
  *
  * @param widthAndHeight
  * 图像的宽高
  * @return bitmap
  */
  public static Bitmap createQRCode(String str, 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];

    for (int y = 0; y < height; y++) {
      for (int x = 0; x < width; x++) {
        if (matrix.get(x, y)) {
          pixels[y * width + x] = BLACK;
        }
      }
    }
    Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);
    bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
    return bitmap;
  }
}

原文地址:https://www.cnblogs.com/awandxx/p/5283892.html