Keyboard not coming for edit text when a back operation is done

In my first page, I have an edittext for the purpose开发者_如何学编程 of searching. Below this edittext i have a set of values shown in a list. When I give a search key n press search button, searching is done and the result is shown in another page as a list of values. If I press device back button and come back to my 1st page, I am not able to type anything in this edittext for doing another search. What may be the reason for this? If anyone knows please reply.

I got it worked. I cleared focus of the edit text when we move to another page.