修改android zxing包中 中CameraManager.java的一個方法，將框的計算和手機的螢幕實際解析度結合，，這樣不管在什麼樣的手機上使用，框的大小都會顯示大小適中；

<span style="font-size:18px;">  public Rect getFramingRect() {
    Point screenResolution = configManager.getScreenResolution();
    if (framingRect == null) {
      if (camera == null) {
        return null;
      }
int width = screenResolution.x * 3 / 5;        //（1）取得當前螢幕寬的
 
3/5

//      if (width < MIN_FRAME_WIDTH) {
//        width = MIN_FRAME_WIDTH;
//      } else if (width > MAX_FRAME_WIDTH) {
//        width = MAX_FRAME_WIDTH;
//      }
      int height = screenResolution.y * 3 / 5;    //（2）取得當前螢幕高的3/5

//      if (height < MIN_FRAME_HEIGHT) {
//        height = MIN_FRAME_HEIGHT;
//      } else if (height > MAX_FRAME_HEIGHT) {
//        height = MAX_FRAME_HEIGHT;
//      }
      
      /* 對比（1）（2）中的值，以其中一個小的為正方形的邊長 */
      width = (width>height?height:width);
      height = (width<height?width:height);
     <span style="color:#ff6666;"> int leftOffset = (screenResolution.x - width) / 2;</span>
      //int topOffset = (screenResolution.y - height) / 2;
      int topOffset = (screenResolution.y - height) / 2 - 40;  /*將掃描框在螢幕中的位置，放上一點 */
      framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
      Log.d(TAG, "Calculated framing rect: " + framingRect);
    }
    return framingRect;   
  }</span>