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copied!<p>What i'm writing here i originally got from many pages but the best one that did it for me is <a href="http://www.vogella.de/articles/AndroidCloudToDeviceMessaging/article.html#example_server" rel="nofollow">http://www.vogella.de/articles/AndroidCloudToDeviceMessaging/article.html#example_server</a> at start i watched the Google I/O 2010 c2dm intro and then i watched this nice lecture <a href="http://marakana.com/forums/android/general/272.html" rel="nofollow">http://marakana.com/forums/android/general/272.html</a> but at last that link up there had all i need to make my application work.</p> <p><strong>The answer:</strong> in the manifest where you specified your receiver like this (this is an element inside the application tag):</p> <pre><code> <receiver android:name="com.google.android.c2dm.C2DMBroadcastReceiver" android:permission="com.google.android.c2dm.permission.SEND">  <intent-filter> <action android:name="com.google.android.c2dm.intent.RECEIVE" /> <category android:name="de.vogella.android.c2dm" /> </intent-filter>  <intent-filter> <action android:name="com.google.android.c2dm.intent.REGISTRATION" /> <category android:name="de.vogella.android.c2dm" /> </intent-filter> </receiver> </code></pre> <p>Notice the category tag, I think you didn't assign a category with your Package name either that or one of this permission is missing from (this is an element inside the manifest root tag):</p> <pre><code><permission android:name="de.vogella.android.c2dm.permission.C2D_MESSAGE" android:protectionLevel="signature" /> </code></pre> <p>as you already guessed the category specifies that only an apllication with that package or sub packages can read the c2dm messages while the android:protectionLevel="signature" specifies that your c2dm messages are protected by a signature (which is the package).</p> <p>Have a nice day i hope i helped</p>

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