二维码扫描慢解决办法
CameraManager.java
public Rect getFramingRect()//预览区域。也就是扫面是画的那个框
public Rect getFramingRectInPreview()//扫描采集区。也就是你的扫描区
这两个方法一个设置预览框大小，一个设置实际扫描区域，把实际扫描区域弄成全屏，把扫描框自定义下大小，让用户将二维码放入识别框，这就让用户不得不拉远距离，实际上从二维码进入镜头就开始识别了，提高了识别率。下面给出调整大小的方法：
public Rect getFramingRect(){Point screenResolution = configManager.getScreenResolution();if(framingRect == null){if(camera == null){return null;}DisplayMetrics metrics = context.getResources().getDisplayMetrics();// 控制宽高int width = (int) (metrics.widthPixels * 0.3);int height = (int) (width * 0.9);// 控制位置int leftOffset = (screenResolution.x - width) / 2;int topOffset = (screenResolution.y - height) / 2;framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);Log.d(TAG, "Calculated framing rect: " + framingRect);}return framingRect;}/*** 扫描识别采集区。也就是你的扫描区* Like {@link #getFramingRect} but coordinates are in terms of the preview frame,* not UI / screen.*/public Rect getFramingRectInPreview(){if(framingRectInPreview == null){Point screenResolution = configManager.getScreenResolution();DisplayMetrics metrics = context.getResources().getDisplayMetrics();// 控制宽高int width = (int) (metrics.widthPixels * 1);int height = (int) (metrics.heightPixels * 1);// 控制位置int leftOffset = (screenResolution.x - width) / 2;int topOffset = (screenResolution.y - height) / 2;framingRectInPreview = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);}return framingRectInPreview;}
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