public class ActivityWithoutServiceConnector extends Activity {

    //remote service interface
    private IEchoService mEchoService;

    /**
     * Service connection that gets call back when service is connected
     */
    private ServiceConnection serviceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder service) {
            //get the service 
            mEchoService = IEchoService.Stub.asInterface(service);
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            mEchoService = null;
        }
    };


    /**
     * Connect with the remote service
     */
    private void conectWithService() {
        Intent serviceIntent = new Intent("util.serviceconnector.ECHO_SERVICE");
        serviceIntent.setComponent(new ComponentName("util.serviceconnector.service", "util.serviceconnector.service.EchoService"));
        startService(serviceIntent);
        bindService(serviceIntent, serviceConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        conectWithService();
    }

}

public class ActivityWithServiceConnector extends Activity {

    @ServiceInfo(serviceIntent = "util.serviceconnector.ECHO_SERVICE")
    private IEchoService mEchoService;

    @ServiceConnectionCallback
    public void onServiceConnectionChanged(String serviceIntent, boolean connected) throws RemoteException {
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        ServiceConnector.bind(this, this);
    }
}