Have you looked into Google AppEngine?  It tracks the users by their
Google ID and also does a lot of other nice things for you.

On Jun 7, 8:18 pm, Dani <[email protected]> wrote:
> Thank you for the answer and sorry for my English,
> I don't mean to protect data stored in the device, but I mean to
> protect the communication between client (my app) and server:
> for example, I want my web service is accessible only by my app. I
> don't want that someone, simply stealing the url, has the chance of
> showing this data on a website.
> So I thought about registration (to track clients behaviour), but I
> think that is annoying for the user.
> Is there a  way to identify (server side) an android device, like
> using google account or a device id?
> Thank you
> Dani
>
> On 7 Giu, 12:58, Mark Murphy <[email protected]> wrote:
>
>
>
> > On Tue, Jun 7, 2011 at 5:23 AM, Dani <[email protected]> wrote:
> > > What is the best way to make data visibile only for your clients app?
> > What is a "bad client"?
>
> > > So is there a way to make this without
> > > stressing the user?
>
> > What is "this"?
>
> > --
> > Mark Murphy (a Commons 
> > Guy)http://commonsware.com|http://github.com/commonsguyhttp://commonsware.com/blog|http://twitter.com/commonsguy
>
> > _Android Programming Tutorials_ Version 3.4 Available!- Hide quoted text -
>
> - Show quoted text -

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