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    <p>The deprecated <code>GCMRegistrar</code> was just a helper client class that stored the RegistrationID locally on the device. <code>GCMRegistrar.isRegistered()</code> never called the GCM server to find if the device is registered (since there is no such API). It just checked if a previously received RegistrationID is locally stored on the device for a specific app (and invalidated the stored RegistrationId on some occassions, such as when the app version changes).</p> <p>In fact, you can see the code of GCMRegistrar <a href="http://code.google.com/p/gcm/source/browse/gcm-client/src/com/google/android/gcm/GCMRegistrar.java?r=87275a7eaab265c60b17f178b0c5cdd2983dc686" rel="nofollow">here</a>:</p> <pre><code>/** * Gets the current registration id for application on GCM service. * &lt;p&gt; * If result is empty, the registration has failed. * * @return registration id, or empty string if the registration is not * complete. */ public static String getRegistrationId(Context context) { final SharedPreferences prefs = getGCMPreferences(context); String registrationId = prefs.getString(PROPERTY_REG_ID, ""); // check if app was updated; if so, it must clear registration id to // avoid a race condition if GCM sends a message int oldVersion = prefs.getInt(PROPERTY_APP_VERSION, Integer.MIN_VALUE); int newVersion = getAppVersion(context); if (oldVersion != Integer.MIN_VALUE &amp;&amp; oldVersion != newVersion) { Log.v(TAG, "App version changed from " + oldVersion + " to " + newVersion + "; resetting registration id"); clearRegistrationId(context); registrationId = ""; } return registrationId; } /** * Checks whether the application was successfully registered on GCM * service. */ public static boolean isRegistered(Context context) { return getRegistrationId(context).length() &gt; 0; } </code></pre> <p>Therefore, if you store the registration ID in your app, you would achieve the exact same functionality you had when you used <code>GCMRegistrar</code>. The only way to know for sure in the client app that the device is registered or not registered to GCM is to call <code>GoogleCloudMessaging.register</code> or <code>GoogleCloudMessaging.unregister</code>. </p>
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    1. COhey thats a really straight forward ans.. thanks!
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    2. COYou're welcome!
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