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    <p>Yes you do need a key. Look at this <a href="http://developer.android.com/google/gcm/gs.html" rel="noreferrer">http://developer.android.com/google/gcm/gs.html</a></p> <p><strong>First, we need to send data to/from the client</strong> for the example you set up (<a href="https://developers.google.com/eclipse/docs/endpoints-androidconnected-gae" rel="noreferrer">App engine connected with Android App</a>) using</p> <pre><code>com.google.android.gcm.server.Sender helper class </code></pre> <p>Again, that helper class is step #4 and how to use it is in <a href="http://developer.android.com/google/gcm/gs.html#server-app" rel="noreferrer">Writing the Server-side Application Server-side Application</a> </p> <p><strong>Naturally then you want to persist or look up data.</strong> You can do that in the whatever class is used to send/receive messages (which of course uses the Sender helper class above)</p> <p><em>Then the easiest and maybe best way for AppEngine if you are using Java is to use Objectify.</em> Trust me or google it to see how good it is. <a href="https://code.google.com/p/objectify-appengine/" rel="noreferrer">https://code.google.com/p/objectify-appengine/</a></p> <p>The docs for Objectify are really good and I didn't really have any trouble the first times.</p> <p>Their simple example is:</p> <pre><code>@Entity class Car { @Id String vin; // Can be Long, long, or String String color; } ofy().save().entity(new Car("123123", "red")).now(); Car c = ofy().load().type(Car.class).id("123123").get(); ofy().delete().entity(c); </code></pre> <p>I think you are good to go.</p> <p>Summary:</p> <ul> <li><p>YourMessageClass (on Appengine)</p> <p>-- uses com.google.android.gcm.server.Sender to send/recieve data</p> <p>-- uses Objectify to persist data.</p></li> </ul> <p>The next question is where are you putting YourMessageClass. Will it be in a Servlet that is handling a short-lived request? (<a href="https://developers.google.com/appengine/docs/java/runtime#Requests_and_Servlets" rel="noreferrer">https://developers.google.com/appengine/docs/java/runtime#Requests_and_Servlets</a>) Will it be in a long-running backend? (<a href="https://developers.google.com/appengine/docs/java/backends/" rel="noreferrer">https://developers.google.com/appengine/docs/java/backends/</a>) but that is beyond the scope of this discussion.</p>
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    1. POHow to use the Google App Engine as a backend database for Android applications
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    1. COThanks, dear friend;....thanks a lot
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