String message = "You should click come back now. It is time out more than 10 minutes.";

//            MessageDialog.showMessageDialog(MainActivity.act, message);

            Intent intent = new Intent(MainActivity.this, MainActivity.class);

//        intent.setAction(Intent.ACTION_MAIN);

//        intent.addCategory(Intent.CATEGORY_LAUNCHER);

//        intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);

            PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this, 0 /* Request code */, intent,

                    PendingIntent.FLAG_CANCEL_CURRENT); //PendingIntent.FLAG_UPDATE_CURRENT

//            Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

            NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(MainActivity.this)

                    .setDefaults(Notification.DEFAULT_ALL)

                    .setSmallIcon(R.drawable.ba)

                    .setContentTitle(getString(R.string.app_name))

                    .setContentText(message)

                    .setAutoCancel(true)

                    .setPriority(Notification.PRIORITY_MAX)

//                    .setSound(defaultSoundUri)

                    .setContentIntent(pendingIntent);

            NotificationManager notificationManager =

                    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

            long time = new Date().getTime();

            String tmpStr = String.valueOf(time);

            String last4Str = tmpStr.substring(tmpStr.length() - 5);

            int mId = Integer.valueOf(last4Str);

            notificationManager.notify(mId /* ID of notification */, notificationBuilder.build());