How to attach .db file with another .apk android?

Well, yopu cant simply copy any files from one private storage, to another. I suppose you can archive this using different ways, for example.

You can get resources from other package with PackageManager. GetResourcesForApplication() method. Also you can share user id between your apps and sign them with share sertificate.

In this case you can even share code base. +@Evos' suggestions.

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.