h2. Foreword As mentioned in part 1 (Developing an android client for a business application - part 1), I won't be able to present fully functioning code, only some snippet, and I'll try to focus on the interface between ABAP and Android/Java.Since it's coming out pretty long, I had to put the Android specific stuff in part 3 (Developing an android client for a business application - part 3) . h2. Web service On the SAP side, I wrote a simple web service.This consists in a class implementing interface IF_HTTP_EXTENSION and an ICF entry:The link between the two is in the details of the web service: