linking android application with google app engine datastore - java

i am looking for a link through a web service between an android application and an application that is deployed on google app engine.the user inputs data in the android application which has to be passed to the jsp and jpa application deployed on the google app engine.Can anyone please help...

See this article for how to authenticate against App Engine from inside your Android app. From there, how you interface is up to you: You can write a RESTful API, or use any number of HTTP-based RPC protocols to communicate between the Android app and the site. Which you choose depends on your needs, which you haven't detailed.

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Maybe I need to create another service in the google app engine application, is there any way to be created?
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importing contacts from gmail,yahoo,msn etc from other services using java/j2ee

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here I have to mention that I am using Amazon web services simple emailing service to send out emails using there java api's.
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The best API is Smack API. Click Here

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I created a Facebook API using PHP and MySQL and hosted it on a domain. Now I would like to host it on Google App Engine, however, Google App Engine does not support PHP. I would like to learn how to write a Java application that can invoke Facebook's API through HTTP and host the Java application on Google App Engine.
If you have any advice or links on how I can accomplish this, it would be a big help.
FYI GAE does support PHP Now: https://developers.google.com/appengine/docs/php/gettingstarted/introduction

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