code: public QrCodeEncoder addBytes(byte[] data) {
  		StringBuilder builder = new StringBuilder(data.length);
  		for (int i = 0; i < data.length; i++) {
  			builder.append((char)data[i]);
  		}
  
  		MessageSegment segment = new MessageSegment();
  		segment.message = builder.toString();
  		segment.data = data;
  		segment.length = data.length;
  		segment.mode = QrCode.Mode.BYTE;
  
  		segment.encodedSizeBits += 4;
  		segment.encodedSizeBits += 8*segment.length;
  
  		segments.add(segment);
  
  		return this;
  	}
docs: Creates a QR-Code which encodes data in the byte format.
  
  @param data Data to be encoded
  @return The QR-Code