将事件动态添加到日历

Question

我正在为一个应用程序编写代码，我可以在其中创建事件，这些事件将以我写的标题和说明显示在日历中。问题是我似乎无法不覆盖前一个就创建它们。我尝试过的每个解决方案都只能覆盖它们，或者不起作用。这是日历代码的相关部分：

import static com.example.alumnos.alumni.Fragments.CreateEventsFragments.EventsTypesFragment3.eventDescription;
import static com.example.alumnos.alumni.Fragments.CreateEventsFragments.EventsTypesFragment3.eventTile;
import static com.example.alumnos.alumni.Fragments.CreateEventsFragments.EventTypesFragment.idTypeEvent;

public class Calendar_Fragment extends Fragment {
    public GregorianCalendar cal_month, cal_month_copy;
    private HwAdapter hwAdapter;
    private TextView tv_month;
    private String tipo;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        switch (idTypeEvent){
            case 1: tipo = "Evento";
                break;
            case 2: tipo = "Oferta de trabajo";
                break;
            case 3: tipo = "Notificación";
                break;
            case 4: tipo = "Noticias";
                break;

        }
        View view = inflater.inflate(R.layout.fragment_calendary, container, false);

        HomeCollection.date_collection_arr=new ArrayList<HomeCollection>();
          HomeCollection.date_collection_arr.add( new HomeCollection("2019-03-12" ,eventTile,tipo,eventDescription));

使用此代码显然会在每次创建事件时将其覆盖，但我不知道如何使它不会。