Android, pick up id of an item from a listview through long click

Question

someone knows how to pull an ID from a Listview item through the SetOnItemLongClickListener and could tell me if this method would work with an item being displayed from the database??

The code of the Adapter:

public class ObjetoAdapter extends BaseAdapter {

private List<Objeto> objeto;

private Context context;

public ObjetoAdapter(Context context, List<Objeto> objeto) {
    this.objeto = objeto;
    this.context = context;
}

@Override
public int getCount() {
    return objeto.size();
}

@Override
public Object getItem(int arg0) {
    return objeto.get(arg0);
}

@Override
public long getItemId(int position) {
    return objeto.get(position).getId();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    View rootView = LayoutInflater.from(context).inflate(R.layout.lista_objetos, parent, false);

    TextView tvID = (TextView) rootView.findViewById(R.id.tvID);
    TextView tvNome = (TextView) rootView.findViewById(R.id.tvLvNome);
    TextView tvValor = (TextView) rootView.findViewById(R.id.tvLvValor);

    Objeto objetoDaVez = objeto.get(position);

    tvID.setText("ID: " + getItemId(position));
    tvNome.setText(" Nome" + objetoDaVez.getNome());
    tvValor.setText(" Valor: R$" + objetoDaVez.getValor());

    return rootView;
}

Answer 1

It was a little difficult to understand, but if I understand correctly, you want to take the id of your object and not simply its position in the listview, as it is received in the Listener parameter. So come on...

In the Onitemlongclicklistener interface we have the onItemLongClick method that takes an Adapterview instance as parameter. Through this instance we can capture the Adapter used in listview through the command adapterView.getAdapter(). Having the Adapter in hand we can invoke the method adapter.getItemId(int posicao), which we usually overwrite when the Adapter is customized. If you overwrite this method in your Adapter, you may have the id, whatever it is, of your object referenced by the listview item that was clicked and not necessarily the position of the item in the list.

listView.setOnItemLongClickListener(new OnItemLongClickListener() {

    @Override
    public boolean onItemLongClick(AdapterView<?> adapterView, View v, int pos, long id) {
        long codigoDoObjeto = adapterView.getAdapter().getItemId(pos);
        return true;
    }
});

I’ll put here an example of the custom Adapter:

public class MeuObjetoListListViewAdapter extends BaseAdapter {

private Context context;
private List<MeuObjeto> meuObjetoList;

public SistemaListViewAdapter(Context context, List<MeuObjeto> meuObjetoList) {
    this.context = context;
    this.meuObjetoList= meuObjetoList;
}

@Override
public long getItemId(int position) {
    return meuObjetoList.get(position).getCodigoIdOuPKQualquer();
}

//Demais métodos ...

}

If not, I apologize, but that’s what I understood =)

Answer 2

If the adapt associated with your Listview for a Cursoradaptar the parameter id passed to the method onItemLongClick(), of the interface Onitemlongclicklistener, represents the value of the field _id of the register associated with the clicked line.

private long listItemPressedId;
minhaList.setOnItemLongClickListener(new OnItemLongClickListener() {

    @Override
    public boolean onItemLongClick(AdapterView<?> adapter, View v,
            int pos, long id) {
        listItemPressedId = id; //id do registo associado à linha clicada
        return false;
    }
});