I have to make an android app to upload a picture from mobile to Flickr. I started reading API Flickr Documentation, but still miss understanding how to autenticate and how to upload. I also read similar questions here, but they show incomplete code snippet, so I can't test them. Can anyone help me? Any link to start?
Have a look at the flickrj library. It's designed to work with Android. It comes with source code to a sample app available in the Google Play market.