private void addListener() {
vl = new VideoListener();
gyro = new AttitudeGetter();
bar = new BarcodeListener();
// heg=new HeightGetter();
bg = new BatteryGetter();
pg = new PositionGetter();
drone.getNavDataManager().addAttitudeListener(gyro);
// drone.getNavDataManager().addAltitudeListener(heg);
drone.getNavDataManager().addBatteryListener(bg);
drone.getVideoManager().addImageListener(vl);
drone.getVideoManager().addImageListener(bar);
}
