Now I am able to retrieve ActivityStreamService of an user, I am getting all files and folders. I am getting file and folder names here. My Question now is how can I get all information of files & folders retrieved using either name of file or identifier for file.
Your question is very vague - can you provide more specific details about the problems you're having please? We also need to know: the platform iOS or Android), whether you've seen the relevant documentation at http://docs.alfresco.com and if you've looked through the source code for the store apps on GitHub?