/*************************Service代码****************************************
/public class LocalService extends Service {
private final IBinder binder = new LocalBinder(); 
public class LocalBinder extends Binder { 
LocalService getService() { 
return LocalService.this; 
} 
} public IBinder onBind(Intent intent) { 
return binder; 
} 
} 
/*****************************Activity代码*************************************/public class BindingActivity extends Activity { 
LocalService localService; 
private ServiceConnection mConnection = new ServiceConnection() { 
public void onServiceConnected(ComponentName className,IBinder localBinder) { localService = (LocalBinder) localBinder.getService(); 
} 
public void onServiceDisconnected(ComponentName arg0) { 
localService = null; 
} 
}; 
protected void onStart() { 
super.onStart(); 
Intent intent = new Intent(this, LocalService.class); 
bindService(intent, mConnection, Context.BIND_AUTO_CREATE); 
} 
protected void onStop() { 
super.onStop(); 
unbindService(mConnection); 
} 
public void printRandomNumber{ 
int num = localService.getRandomNumber(); 
System.out.println(num); 
}
}

context.bindService()->onCreate()->onBind()->Service running
onUnbind() -> onDestroy() ->Service stop