public void setCameraSettings(CameraSettings cameraSettings) {
        this.cameraSettings = cameraSettings;
    }
Set the CameraSettings. Use this to select a different camera, change exposure and torch
settings, and some other options.

This has no effect if the camera is already open.

@param cameraSettings the new settings
zxing-android-embedded/src/com/journeyapps/barcodescanner/CameraPreview.java