public boolean onOrientationChanged(int orientation) {
   for (IExternalDeviceCtrl iDeviceConnected : mIDeviceConnected) {
     iDeviceConnected.onOrientationChanged(orientation);
   }
   return false;
 }
 public void removeListener(Object listenr) {
   for (IExternalDeviceCtrl iDeviceConnected : mIDeviceConnected) {
     iDeviceConnected.removeListener(listenr);
   }
 }
 public boolean onDestory() {
   for (IExternalDeviceCtrl iDeviceConnected : mIDeviceConnected) {
     iDeviceConnected.onDestory();
   }
   return false;
 }