Android zxing二维码扫描 扫描框适应各种分辨率

public synchronized Rect getFramingRect() {           if (framingRect == null) {               if (camera == null) {                   return null;               }               Point screenResolution = configManager.getScreenResolution();               if (screenResolution == null) {                   // Called early, before init even finished                   return null;               }                  // int width = findDesiredDimensionInRange(screenResolution.x,               // MIN_FRAME_WIDTH, MAX_FRAME_WIDTH);               // int height = findDesiredDimensionInRange(screenResolution.y,               // MIN_FRAME_HEIGHT, MAX_FRAME_HEIGHT);                  /* 扫描框修改 */               DisplayMetrics metrics = context.getResources().getDisplayMetrics();               int width = (int) (metrics.widthPixels * 0.6);               int height = (int) (width * 0.9);                  int leftOffset = (screenResolution.x - width) / 2;               int topOffset = (screenResolution.y - height) / 4;               framingRect = new Rect(leftOffset, topOffset, leftOffset + width,                       topOffset + height);               Log.d(TAG, "Calculated framing rect: " + framingRect);           }           return framingRect;       }