Append new Arraylist in arrayadapter

I have a problem that I want to append or add a new arraylist in an arrayadapter which is already running. Means I want to retain its previous list an开发者_开发技巧d want to add more items through an another arraylist. How it will possible? Means suggest me the right solution for this problem.

Thanks in advance.

ArrayList.addAll();

The docs usually help. Just add them.