Thanks a lot for your Reply.
Now I am trying with shared preference. I have some design issues.
1. I am not able to acess outside the package<which contains main Activity>. It shows stack overflow error in runtime. Is there any option i can access outside the application package ?
2. How can I edit the <prefs.xml> in adb shell ? I am able to see the file and shared preference values using cat command. what is the command to edit the file? " vi" is not working in the shell.