Android Open Handset Developers Community

Hi Experts,
I am new in the field of android development. I am having an application which uses function provided in my own created dll. I would like to read or write a file in android. But wihout inheriting Activity class , I cant do the same . But if I used Activity class in my dll, then it might conflict with my main application 's Activity class too. So is there anyway by which I can create (read/write) the file in android without using Activity class ?

Thanks & Regards
Vikas