Me gustaría recibir notificaciones automáticas cuando mi aplicación esté abierta pero en segundo plano. Por ahora, he cambiado la demostración de Estimote, y mi aplicación me avisa cuando mi aplicación está en primer plano, lo que no es muy útil. Publico aquí mi código de la clase NotifyDemoActivity que se llama tan pronto como abro la aplicación

public class NotifyDemoActivity extends Activity {
  private static final String TAG = NotifyDemoActivity.class.getSimpleName();
  private static final int NOTIFICATION_ID = 123;
  private BeaconManager beaconManager;
  private NotificationManager notificationManager;
  private Region region;
  private long[] mVibratePattern = { 0, 200, 200, 300 };

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.notify_demo);
    getActionBar().setDisplayHomeAsUpEnabled(true);

    beacon.getMinor());
    region = new Region("rid", null, null, null);
    notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    beaconManager = new BeaconManager(this);

    beaconManager.setBackgroundScanPeriod(TimeUnit.SECONDS.toMillis(1), 0);

    beaconManager.setMonitoringListener(new MonitoringListener() {
      @Override
      public void onEnteredRegion(Region region, List<Beacon> beacons) {
        postNotification("Entered region");
      }

      @Override
      public void onExitedRegion(Region region) {
        postNotification("Exited region");
      }
    });
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
      finish();
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  @Override
  protected void onResume() {
    super.onResume();
    notificationManager.cancel(NOTIFICATION_ID);
    beaconManager.connect(new BeaconManager.ServiceReadyCallback() {
      @Override
      public void onServiceReady() {
        try {
          beaconManager.startMonitoring(region);
        } catch (RemoteException e) {
          Log.d(TAG, "Error while starting monitoring");
        }
      }
    });
  }

  @Override
  protected void onDestroy() {
    notificationManager.cancel(NOTIFICATION_ID);
    beaconManager.disconnect();
    super.onDestroy();
  }

  private void postNotification(String msg) {
    Intent notifyIntent = new Intent(NotifyDemoActivity.this, NotifyDemoActivity.class);
    notifyIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivities(
      NotifyDemoActivity.this,
      0,
      new Intent[]{notifyIntent},
      PendingIntent.FLAG_UPDATE_CURRENT);
    Notification notification = new Notification.Builder(NotifyDemoActivity.this)
    .setSmallIcon(R.drawable.beacon_gray)
    .setContentTitle("Notify Demo")
    .setContentText(msg)
    .setAutoCancel(true)
    .setContentIntent(pendingIntent)
    .setVibrate(mVibratePattern)
    .build();
    notification.defaults |= Notification.DEFAULT_SOUND;
    notification.defaults |= Notification.DEFAULT_LIGHTS;
    notificationManager.notify(NOTIFICATION_ID, notification);

    TextView statusTextView = (TextView) findViewById(R.id.status);
    statusTextView.setText(msg);
  }
}