public class MyActivity implements Listener {	private TextView mText;	private InternetManager mInetMgr;	public void onStateChange(boolean state) {		if (state) {			mText.setText("on");		} else {			mText.setText("off");		}	}	public void onCreate() {		mInetMgr = new InternetManager();		mInetMgr.registerListener(this);		mInetMgr.doYourWork();	}}

public class InternetManager {	private Listener mListener = null;	public void registerListener(Listener listener) {		mListener = listener;	}	private boolean isInternetOn = false;	public void doYourWork() {		isInternetOn = true;		if (mListener != null)			mListener.onStateChange(isInternetOn);	}}

public interface Listener {	public void onStateChange(boolean state);}