ZXing扫描的优化

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我是靠谱客的博主愉快保温杯，最近开发中收集的这篇文章主要介绍ZXing扫描的优化，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

斑马线扫描优化

将AndroidManifest中的屏幕对齐方式改为android：screenOrientation =“portrait”;
。CameraConfigurationManager类的setDesiredCameraParameters（）方法中在camera.setParameters（参数）之前加入设置相机后摄像头的方向为90 theCamera.setDisplayOrientation(90);

CameraManager 类的 getFramingRectInPreview（）方法中原来的方法注销更替为新代码，这样写的目的其实就是将相机旋转90之后，获取宽高也需要变更。

/*rect.left = rect.left * cameraResolution.x / screenResolution.x;
 rect.right = rect.right * cameraResolution.x / screenResolution.x;
 rect.top = rect.top * cameraResolution.y / screenResolution.y;
 rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;*/
rect.left = rect.left * cameraResolution.y / screenResolution.x;
rect.right = rect.right * cameraResolution.y / screenResolution.x;
rect.top = rect.top * cameraResolution.x / screenResolution.y;
rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;

DecodeHandler 类的解码 方法中在activity.getCameraManager（）。buildLuminanceSource（）之前添加以下代

byte[] rotatedData = new byte[data.length];
for (int y = 0; y < height; y++) {
  for (int x = 0; x < width; x++)
    rotatedData[x * height + height - y - 1] = data[x + y * width];

}
int tmp = width;
width = height;
height = tmp;
data = rotatedData;

解决竖屏拉伸问题
CameraConfigurationManager类的initFromCameraParameters（）方法中：
在Log.i（TAG，“屏幕分辨率”+ screenResolution）;之后添加以下代码：

Point screenResolutionForCamera = new Point();
screenResolutionForCamera.x = screenResolution.x;
screenResolutionForCamera.y = screenResolution.y;
if (screenResolution.x < screenResolution.y) {
  screenResolutionForCamera.x = screenResolution.y;
  screenResolutionForCamera.y = screenResolution.x;
}

同时修改下一句为cameraResolution = findBestPreviewSizeValue（parameters，screenResolutionForCamera）;

框扫描位置大小：修改此时的扫描框的竖直拉伸的矩形，很难看，我们可以将其修改为正方形或扁平型的。

CameraManager 类的getFramingRect（）方法中替换以下代码：

/* int width = findDesiredDimensionInRange(screenResolution.x, MIN_FRAME_WIDTH, MAX_FRAME_WIDTH);
 int height = findDesiredDimensionInRange(screenResolution.y, MIN_FRAME_HEIGHT, MAX_FRAME_HEIGHT);*/
 DisplayMetrics metrics = context.getResources().getDisplayMetrics();
 int width = (int) (metrics.widthPixels * 0.625);
 int height = (int) (width * 0.9);

此处我们根据屏幕分辨率来定扫描框大小更灵活一点，同时将偏移量topOffset修改为 int topOffset = (screenResolution.y - height) / 3;

框扫描四个角状语从句：扫描线条修改
。示例代码中的线条的英文居中且不动的，我们可以将其修改为上下移动的扫描线，可以御姐改变线条的样式
在自定义扫描布局ViewfinderView类中的的onDraw（）中方法绘制四个角，关键代码如下：

//左上角
 canvas.drawRect(frame.left,frame.top,frame.left+ CORNER_WIDTH,frame.top+ CORNER_HEIGHT,paint);
 canvas.drawRect(frame.left,frame.top,frame.left + CORNER_HEIGHT,frame.top + CORNER_WIDTH,paint);
//左下角
 canvas.drawRect(frame.left,frame.bottom - CORNER_HEIGHT,frame.left + CORNER_WIDTH,frame.bottom,paint);
 canvas.drawRect(frame.left,frame.bottom - CORNER_WIDTH,frame.left + CORNER_HEIGHT,frame.bottom,paint);
//右上角
 canvas.drawRect(frame.right- CORNER_WIDTH,frame.top,frame.right,frame.top+ CORNER_HEIGHT,paint);
 canvas.drawRect(frame.right - CORNER_HEIGHT,frame.bottom,frame.right,frame.top + CORNER_WIDTH,paint);
//右下角
 canvas.drawRect(frame.right - CORNER_HEIGHT,frame.bottom - CORNER_WIDTH,frame.right,frame.bottom,paint);
 canvas.drawRect(frame.right - CORNER_WIDTH,frame.bottom - CORNER_HEIGHT,frame.right,frame.bottom,paint);