Hopefully you've solved your problem by now, but I think the issue you are running into is that you are setting the camera preview to null, and it needs a valid SurfaceView as the preview to turn the flash on (at least on a Galaxy Nexus and some other Samsung devices...).
Try putting an if statement that tests if the filepath your using is a real directory like this.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.