I am trying to build an Android app using liferay mobile sdk and liferay screens and I want to implement Push Notification.
I have followed the steps in the tuotrial :https://www.youtube.com/watch?v=4LjutX0dcRw&feature=youtu.be.

And i have arrived to a step where I find my device registered in my liferay Portal in device section But still dont receive notifications.

This is my Activity Code .What Am i missing?? Please any help :

public class MainActivity extends PushScreensActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Session session = new SessionImpl("xxxxxxxxxxxxxxxxxxxxxxxxxxx", new BasicAuthentication("xxxxxx", "xxx"));

try {
Push.with(session).register(this, "xxx");
Push.with(session).onPushNotification(new Push.OnPushNotification() {
@Override
public void onPushNotification(JSONObject pushNotification) {
System.out.println("NOtification !"+pushNotification);
}
});
} catch (Exception e) {
System.out.println(" Error While Registring!");
e.printStackTrace();
}
}

@Override
protected Session getDefaultSession() {
Session session = new SessionImpl("xxxxxxxxxxxxxxxxxxxxx", new BasicAuthentication("rxxxx", "xxx"));

return session;
}

@Override
protected void onPushNotificationReceived(JSONObject jsonObject) {
System.out.println("Receiving :"+jsonObject);
}

@Override
protected void onErrorRegisteringPush(String message, Exception e) {
System.out.println("Problem Registration");
}

@Override
protected String getSenderId() {
return "xxxxxxxxxxxx";
}