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Javier fr
Asked: 2020-03-06 12:23:58 +0800 CST 2020-03-06 12:23:58 +0800 CST

Show data in ListView in reverse way

  • 772

I have an ArrayList of type ArrayList v_DtCajasTarimasLista and every time I enter new data it is correctly added and displayed in the ListView, but what happens is that the last record entered appears at the bottom of the ListView and what I need is the opposite of what appears at the top of the ListView.

How should I do to invert the order of values ​​of the ListView?

I hope you can help me. Thank you

My code:

v_DtCajasTarimas = new ListaDtCajasTarimas();
                    v_DtCajasTarimas.setV_itemCode(codigo);
                    v_DtCajasTarimas.setV_status("");
                    v_DtCajasTarimas.setIdLinea(contCajas);
                    v_DtCajasTarimasLista.add(v_DtCajasTarimas);
adaptadorListaCajaTarima = new AdaptadorListaCajaTarima(getMyActivity(), v_DtCajasTarimasLista);
                    adaptadorListaCajaTarima.setObjetosGenerales(objetosGenerales);
                    adaptadorListaCajaTarima.setAppCompatActivity(getAppCompatActivity());
                    adaptadorListaCajaTarima.setItemFragment(this);
                    listViewCajaTarima.setAdapter(adaptadorListaCajaTarima);
java

1 Answers

  1. Best Answer

    If you have a List of elements and you want to reverse the order you can use Collections.sort() or Collections.reverse() before adding the data to Adapteryour ListView:

    Collections.sort(listElementos);

    either

       Collections.reverse(listElementos);

    In the case of your code changing the order before assigning them to the Adapter, using Collections.reverse() will change the order of the elements inside the List:

    Collections.reverse(v_DtCajasTarimasLista)
adaptadorListaCajaTarima = new AdaptadorListaCajaTarima(getMyActivity(), v_DtCajasTarimasLista);
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