I wonder if I have to use the openerp android app, for the smartphone's use, or just optimize it so as to be suitable to smartphones screen ?.

If anybody has an experience with implementing openerp on android, please share it with me, any usefull links will be welcome.

I know there is some very good android apps on playstore, I need to customize it, if there is any tutorials on customizing openerp android apps, it will be very kind.

I need also to know about, the difficulties about doing this kind of implementations : 

Do I need to know a lot about XML-RPC ?

Do I need very good android developpement skills ? if yes, please give some tutorials to. or just what I need to master the openerp android app customizations.

My need is to have an android app, doing sales operations, Like CRM, sales order, very simple and usefull, and also working off connexion.

 Thanks a lot.