These two function are not use like this you have to use them like this.
You are not calling setPreviewDisplay() in your surfaceChanged function; this means you might not be setting your display correctly when returning to your application.
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.