title: PendingIntent not opening Activity in Android 4.3
body: <p>In my <code>Service</code>, I open up a notification on normal run, using this code:</p>
  
  <pre><code>private final static NOTIFICATION_ID = 412434;
  private void startNotification() {
      NotificationCompat.Builder builder = new NotificationCompat.Builder(
              this);
      builder.setSmallIcon(R.drawable.notification);
      builder.setContentTitle("Running");
  
      final Intent intent = new Intent(this, MainActivity.class);
      intent.setAction(Intent.ACTION_VIEW);
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
      final PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
              intent, PendingIntent.FLAG_UPDATE_CURRENT);
      builder.setContentIntent(contentIntent);
      builder.setOngoing(true);
      builder.setAutoCancel(false);
  
      notification = builder.build();
  
      startForeground(NOTIFICATION_ID, notification);
  }
  </code></pre>
  
  <p>The <code>PendingIntent</code> is to open the <code>MainActivity</code> when the Notification is tapped. This works perfectly fine on all my test devices, using Android 2.3.3, 2.3.5 and Android 4.1.</p>
  
  <p>It does not work, however on my Nexus 7 (Android 4.3), this doesn't work at all. Nothing happens when I tap on the Notification.</p>
  
  <p>Did something change in the way these are put together that I missed?</p>