cameraManager.openDriver(surfaceHolder)，也就是camera.open(),抛出IOException

在代码前加// check Android 6 permission        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)                == PackageManager.PERMISSION_GRANTED) {            Log.i("TEST","Granted");            //init(barcodeScannerView, getIntent(), null);        } else {            ActivityCompat.requestPermissions(this,                    new String[]{Manifest.permission.CAMERA}, 1);//1 can be another integer        }