Android -条形码的生成

主要思路

• 1.导入Zxing包，根据架包MultiFormatWriter类 ，将字符串宽高，计算出一定时间内x,y偏移量 生成对应的黑白图片。

1.客户端代码

Button generateQRCodeButton = (Button) this
          .findViewById(R.id.btn_add_qrcode);
 generateQRCodeButton.setOnClickListener(new OnClickListener(){
    @Override
   public void onClick(View view) {
           String contentString = qrStrEditText.getText().toString();
           if (!contentString.equals("")) {
                // 根据字符串生成条形码图片并显示在界面上，第二个参数为图片的大小（350*350）
                Bitmap qrCodeBitmap=null;
                qrCodeBitmap= BarcodeCreater.creatBarcode(contentString, 120, 60);
                bg.setImageBitmap(qrCodeBitmap); 
            } else {
               Toast.makeText(MainActivity.this, "Text can not be empty", Toast.LENGTH_SHORT.show();
           }
    }

2.条形码生成代码

private static final int BLACK = 0xff000000;
private static final int WHITE = 0xFFFFFFFF; 
private static BarcodeFormat barcodeFormat= BarcodeFormat.CODE_128;
public  static Bitmap creatBarcode(String contents, int desiredWidth,int desiredHeight) {
      MultiFormatWriter writer = new MultiFormatWriter();
    BitMatrix result=null;
        try {
              result = writer.encode(contents, barcodeFormat, desiredWidth,
                      desiredHeight);
        } catch (WriterException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
        }
            int width = result.getWidth();
          int height = result.getHeight();
          int[] pixels = new int[width * height];
          // All are 0, or black, by default
          for (int y = 0; y < height; y++) {
              int offset = y * width;
              for (int x = 0; x < width; x++) {
                  pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
              }
          }
          Bitmap bitmap = Bitmap.createBitmap(width, height,
                  Bitmap.Config.ARGB_8888);
          bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
          return bitmap;
  }