Hi there! I am indian Android developer with 1+ year of experience in android app development.
I have recently completed on project called "Maatritva", in which i have implemented offline feature to allow app to store data locally whenever there is no internet connectivity. So, i have pretty good idea about offline functionality. I will be glad to work for you :).
I have added my bid duration/fees as formality. After deciding the project scope, we can discuss about actual fees and time duration.
Thank you :0