I reasearched this, and this code is what I got

The app crashes when I open the MainActivity

```
 NotificationCompat.Builder builder =
   new NotificationCompat.Builder(MainActivity.this)
   .setSmallIcon(R.drawable.ic_launcher)
   .setContentTitle("Get Other APW Co. Apps on Play!")
   .setContentText("Want more? All our apps are free!");
   int mNotificationId = 001;
   NotificationManager mNotifyMgr =
            (NotificationManager) getSystemmService(NOTIFICATION_SERVICE);
   mNotifyMgr.notify(mNotificationId, builder.build());

```