How should I decide whether my Android App needs backend?

I am a beginner in Android App Development and I am trying to make a "Photo Editing and Sharing App".This App won't have any user registration and it can save photos in the mobile gallery.And for the sharing part right now I have decided to keep only the option of sharing via email.Given these details do my App needs a backend ?

Thanks in advance.

Comments

[Keff]

If what you describe is all the app will do, then no, I don't think you need any backend. If you mean backend as in API running on a server.