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;
	}