Class</A>&lt;? extends <A target="_top" HREF="http://developer.android.com/reference/android/app/Activity.html?is-external=true" title="class or interface in android.app">Activity</A>&gt;&nbsp;cls)</PRE>
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<DD>Helper function to subscribe to push notifications with the default application icon.
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<DT><B>Parameters:</B><DD><CODE>context</CODE> - This is used to access local storage to cache the subscription, so it must currently
          be a viable context.<DD><CODE>channel</CODE> - A string 