how to use greenrobot to pass data to activity or fragment that has not been initialized yet?

I tried to use greenrobot pass data between activities and fragment,but I couldn't find a suitable tutorial that show how do it in detail. Based on what I have read so far I wrote some thing like this,but it doesn't work.how can I use green robot to pass data to an activity or fragment that has not been inialized yet?

MainActivity :

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    EventBus.getDefault().post(new String("We are the champions"));
    Intent intent = new Intent("com.test.Activity_Lessons");
    startActivity(intent);
}

Activity_Lessons :

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //Some initializations
    EventBus.getDefault().register(this);
    //Other Stuff
}

public void onEventMainThread(String s){
    Toast.makeText(getActivity(), s, Toast.LENGTH_LONG).show();
}

The event handler is never called here.what am I doing wrong?