Unable to start activity componentinfo java.lang.nullpointerexception?

Have you declared the Activity named activity3 in your AndroidManifest. Xml?

Its not possible because the other class does't know there something called SharedPreference.. so.

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.