public boolean addNetworkConnectedListener(
			NetworkConnectedListener listener) {
		synchronized (this) {
			if (connectedListeners.contains(listener)) {
				return true;
			}
			return connectedListeners.add(listener);
		}
	}
public boolean addNetworkConnectedListener ( NetworkConnectedListener listener ) { synchronized ( this ) { if ( connectedListeners . contains ( listener ) ) { return true ; } return connectedListeners . add ( listener ) ; } }
Registers Network Connection Listener<br>
Once registered, connection listeners can be alerted when the device
comes to have network connection

@param listener
Listener which implements INetworkConnectedListener
@return true if already that listener is registered; false otherwise