title: android open app with touch on notification
body: <p>at the moment i set an notification in my android app like this:</p>
  
  <pre><code>private Notification getNotification(String content) {
      Notification.Builder builder = new Notification.Builder(this);
      builder.setContentTitle(getString(R.string.app_name));
      builder.setContentText(content);
      builder.setTicker(content);
      builder.setSmallIcon(R.drawable.ic_notification_appicon);
      builder.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));
      builder.setDefaults(Notification.DEFAULT_VIBRATE);
      builder.setAutoCancel(true);
      builder.setLights(Color.GREEN, 500, 500);
      return builder.getNotification();
  }
  </code></pre>
  
  <p>Problem is, that i would like to press on the notification which should  open the app. but if i touch on the notification, nothing happens.
  any ideas?</p>