Zxing生成二維碼(可帶圖標)

Zxing生成二維碼(可帶圖標)

SwetakeQRCode、BarCode4j、Zxing…… 生成二維碼的開源項很多,在下不才只目前只瞭解這幾個,
選擇Zxing的原因可能是因爲google吧,還一個就是Zxing網絡上解決方案比較多

首先要在build.gradle中添加 compile ‘com.google.zxing:core:3.2.1’
Zxing官網地址點我

private void Create2QR2(String urls,ImageView imageView) {
  String uri = urls;
  int mScreenWidth = 0;
  Bitmap bitmap;
  try {
  /**
  * 獲取屏幕信息的區別
  * 只有activity可以使用WindowManager否則應該使用Context.getResources().getDisplayMetrics()來獲取。
  * Context.getResources().getDisplayMetrics()依賴於手機系統,獲取到的是系統的屏幕信息;
  * WindowManager.getDefaultDisplay().getMetrics(dm)是獲取到Activity的實際屏幕信息。
  */
  DisplayMetrics dm = new DisplayMetrics();
  aty.getWindowManager().getDefaultDisplay().getMetrics(dm);
  mScreenWidth = dm.widthPixels;

  bitmap = BitmapUtil.createQRImage(uri, mScreenWidth,
  BitmapFactory.decodeResource(getResources(), R.mipmap.applogo));//自己寫的方法

  if (bitmap != null) {
          imageView.setImageBitmap(bitmap);
  }
  } catch (Exception e) {
                 e.printStackTrace();
  }

  }
//生成二維碼圖片(不帶圖片)
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];
  //畫黑點
  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;
  }
帶圖片的二維碼
public static Bitmap createQRImage(String content, int heightPix, Bitmap logoBm) {
  try {
// if (content == null || "".equals(content)) {
// return false;
// }

  //配置參數
  Map<EncodeHintType, Object> hints = new HashMap<>();
  hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
  //容錯級別
  hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
  //設置空白邊距的寬度
  // hints.put(EncodeHintType.MARGIN, 2); //default is 4

  // 圖像數據轉換,使用了矩陣轉換
  BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, heightPix, heightPix, hints);
  int[] pixels = new int[heightPix * heightPix];
  // 下面這裏按照二維碼的算法,逐個生成二維碼的圖片,
  // 兩個for循環是圖片橫列掃描的結果
  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;
  }
  }
  }

  // 生成二維碼圖片的格式,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);
  }

  //必須使用compress方法將bitmap保存到文件中再進行讀取。直接返回的bitmap是沒有任何壓縮的,內存消耗巨大!
  return bitmap;
  } catch (WriterException e) {
  e.printStackTrace();
  }

  return null;
  }

  /**
  * 在二維碼中間添加Logo圖案
  */
  private static Bitmap addLogo(Bitmap src, Bitmap logo) {
  if (src == null) {
  return null;
  }

  if (logo == null) {
  return src;
  }

  //獲取圖片的寬高
  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大小爲二維碼整體大小的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;
  }
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