I am trying to do exactly this.  Did you ever find a solution?   I thought 
I would be able to pass the auth cookie in the header of the request from 
android and be able to access the User Service, however I aways get 
user==null.  I have posted a question on stackexchange :   
http://stackoverflow.com/questions/9811730/login-to-appengine-from-android-client
 

On Wednesday, May 6, 2009 10:41:28 PM UTC-4, radarcg wrote:
>
> I'm also curious about this, but perhaps slightly differently. Is it 
> possible for an android application (NOT mobile website) to access the 
> authentication token that already exists, and pass it do a web 
> application that is hosted on the Google App Engine? 
>
> On May 6, 4:37 pm, "Jason (Google)" <apija...@google.com> wrote: 
> > Hi Anil. ClientLogin might be the solution you're looking for. Read the 
> > resources below then let me know if you have any specific questions 
> about 
> > how to do this: 
> > 
> > 
> http://code.google.com/apis/accounts/docs/AuthForInstalledApps.htmlhttp://groups.google.com/group/google-appengine-java/browse_thread/th...
>  
>
> > 
> > You might want to check out the Google Data library for Java which has 
> > support for ClientLogin, although I'm not sure if it can be used to 
> connect 
> > to non-GData services. Regardless, the URL ishttp://
> code.google.com/p/gdata-java-client/ 
> > 
> > - Jason 
> > 
> > On Tue, May 5, 2009 at 12:15 AM, Anil <anil.ahir...@gmail.com> wrote: 
> > 
> > > I am communicating with app engine application with android gadget and 
> > > further app engine application will communicate with the destination 
> > > resource via SDC. 
> > > how the authentication is going to happen between app engine and 
> > > android? we would need one time authentication with android gadget to 
> > > app engine application which will be further used with SDC. 
> > 
> > > Thanks & Regards, 
> > > Anil

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