I read your project description & understand what you need. You want android application that use whatsapp last seen with design. I have few questions:
1) What is app fetchers ?
2) Do you want to developeDaha Fazla
I'm a web and desktop developer with 8 years of experience in this industry, I read your project description.
I can do what you want just get in touch with me and we can discuss more about your project.
Best RegDaha Fazla