title: Remove notification icon when user open app through launcher Icon
body: <p>Hello I am developing an app in which i want to give push notifications to user when Sms receives. Now the problem is that the notification icon still does not remove when app open by user through launcher icon
  Here is my code:</p>
  
  <pre><code>NotificationCompat.Builder notify = new NotificationCompat.Builder(context);
              notify.setSmallIcon(R.drawable.appicon);
              notify.setContentTitle(title);
              notify.setContentText(msgBody);
              notify.setAutoCancel(true);
              Notification notification = new Notification();
              notification.defaults |= Notification.DEFAULT_VIBRATE;
  
              //notify.setVibrate(new long[]{1000, 1000, 1000, 1000, 1000});
              notify.setLights(Color.GREEN, 2000, 2000);
              notify.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));
              Intent notificationIntent = new Intent(Intent.ACTION_MAIN);
              notificationIntent.addCategory(Intent.CATEGORY_DEFAULT);
              notificationIntent.setType("vnd.android-dir/mms-sms");
              notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
              PendingIntent intentt = PendingIntent.getActivity(context, 0,notificationIntent, 0);
              notify.setContentIntent(intentt);
              NotificationManager notificationManager = (NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);
              notificationManager.notify(0, notify.build());
  </code></pre>
  
  <p>I tried like this too:</p>
  
  <pre><code>notificationManager.cancel(0);
  </code></pre>
  
  <p>and also tried this:</p>
  
  <pre><code>notificationManager.cancelAll();
  </code></pre>
  
  <p>but both these doesnot work. They doesnot allow notification to occur. Maybe they are cancelling the push notification before its creation.
  Please Help!</p>