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copied!<p>I found the solution myself. I'm sure that this is not the best way to do it, but at least it works for me.</p> <p>Create a singleton class that derives <code>Handler</code> to store the active <code>ConversationActivity</code>. In the <code>handleMessage</code> method, handle message that will be dispatched from the service that tells the handler to tell the activity to refresh the conversation.</p> <pre><code>public class ActiveMessageHandler extends Handler { private static ActiveMessageHandler _instance = new ActiveMessageHandler(); private Activity _activity = null; @Override public void handleMessage(Message message) { if(message.obj.toString().equals("gcmNewMessage") && _activity != null) ((ConversationActivity)_activity).repopulateList(); super.handleMessage(message); } public static ActiveMessageHandler instance() { return _instance; } public void setActivity(Activity activity) { _activity = activity; } public Activity getActivity() { return _activity; } } </code></pre> <p>Then, in <code>ConversationActivity</code>, set the activity attribute in the handler.</p> <pre><code>public class ConversationActivity extends Activity { @Override public void onStart() { super.onStart(); ActiveMessageHandler.instance().setActivity(this); } @Override public void onStop() { super.onStop(); ActiveMessageHandler.instance().setActivity(null); } } </code></pre> <p>Finally, in the service, check if the activity in the handler is not null and send a message to the handler to refresh the conversation.</p> <pre><code>public class GCMIntentService extends GCMBaseIntentService { @Override protected void onMessage(Context context, Intent intent) { Bundle extras = intent.getExtras(); String sender = extras.getString("sender"); String message = extras.getString("message"); ConversationModel model = new ConversationModel(context); model.open(); model.createMessage(sender, message.trim(), true, true, ConversationMessage.STATUS_SENT); model.close(); // if ConversationActivity is active, send a message to handler to refresh the conversation if(ActiveMessageHandler.instance().getActivity() != null) { Message msg = Message.obtain(ActiveMessageHandler.instance()); msg.obj = "gcmNewMessage"; ActiveMessageHandler.instance().sendMessage(msg); // Optionally, play a notification sound Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION); Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification); r.play(); } else createMessageNotification(context, sender, message); } } </code></pre>

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