ZXING扫码，距离近无法识别的问题

修改扫描距离 

CameraConfigurationManager.java

void setDesiredCameraParameters(Camera camera) {  

/* Camera.Parameters parameters = camera.getParameters();  

Log.d(TAG, "Setting preview size: " + cameraResolution);  

parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);  

setFlash(parameters);  

setZoom(parameters);  

//setSharpness(parameters); /

/modify here  

camera.setDisplayOrientation(90);  

camera.setParameters(parameters);*/  

Camera.Parameters parameters = camera.getParameters();  

List<Camera.Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes();  

int position =0;  

if(supportedPreviewSizes.size()>2){  

position=supportedPreviewSizes.size()/2+1;

//supportedPreviewSizes.get();  

}else {  

position=supportedPreviewSizes.size()/2;  

}  

int width = supportedPreviewSizes.get(position).width;  

int height = supportedPreviewSizes.get(position).height;  

Log.d(TAG,"Setting preview size: " + cameraResolution);  

camera.setDisplayOrientation(90);  

cameraResolution.x=width;  

cameraResolution.y=height;  

parameters.setPreviewSize(width,height);  

setFlash(parameters);  

setZoom(parameters);  

//setSharpness(parameters);  

camera.setParameters(parameters); }