Repeated items with different amounts in a Listview

Question

I have a Listview (lsvProduct) with some items that comes from a request and an Edittext of amount that the user can change (by default, I bring the value of 0). By adding this item, I send it to another Listview (lsvCarrinho) with a very similar structure and with an Edittext that tbm can be changed, like the images below ():

Problem: If I add an item in lsvCarrinho (2x or more) but with different quantities, instead of adding up the amount of items added in a single row, I would like it to leave in separate rows. My Listview already does that. In my case, if the same item is added more than 1x, it repeats the last quantity placed (the item is repeated but with the amount value equal to the last item that was added and it had been added with a different amount value). What do I do to differentiate the quantity even if the item is being repeated in the listview? It does not repeat the amount if I add a different item between them.

Ex.: I added a Clock - with quantity equal to 2, then added the same Clock with quantity equal to 3. In my Listview there are 2 lines with quantity equal to 3. Then add the same Clock with quantity equal to 5, In my Listview there are 3 Clock lines with 5 in quantity (Clock = 5 / Clock = 5 / Clock = 5 but it should stay Clock = 2 / Clock = 3 / Clock = 5). If I put a Cap and then a Clock again looks like this (Clock = 5 / Clock = 5 / Clock = 5 / Cap = 1 / Clock = 1)

Code of the Trolley’s Adapter:

public class LancarVendaCarrinhoListViewAdapter extends BaseAdapter {

private Context mContext;
private List<PesquisarProdutoObjetoRetorno> mDataSource;

public LancarVendaCarrinhoListViewAdapter(Context context, List<PesquisarProdutoObjetoRetorno> items)
{
    mContext = context;
    mDataSource = items;
}

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

@Override
public Object getItem(int position) {
    return mDataSource.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent)
{
    try
    {
        LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View sView = mInflater.inflate(R.layout.activity_lancarvenda_carrinho_list_view_item, parent, false);

        PesquisarProdutoObjetoRetorno sItem = (PesquisarProdutoObjetoRetorno) getItem(position);

        TextView descricao = (TextView)sView.findViewById(R.id.lancarvenda_carrinho_item_txtdescricao);
        descricao.setText(sItem.getDescricao());

        TextView preco = (TextView)sView.findViewById(R.id.lancarvenda_carrinho_item_txvpreco);
        preco.setText(Texto.FormatarValor(sItem.getPreco()));

        NumberPicker quantidade = (NumberPicker)sView.findViewById(R.id.lancarvenda_carrinho_item_etquantidade);
        quantidade.setValue((int)sItem.getQuantidade());

        return sView;
    }
    catch (Exception e)
    {
        e.printStackTrace();
        return null;
    }
}

public List<PesquisarProdutoObjetoRetorno> getItemList()
{
    return mDataSource;
}

public void setItemList(List<PesquisarProdutoObjetoRetorno> itemList)
{
    this.mDataSource = itemList;
}

}

Code that adds items to the list:

Button adicionar = (Button)sView.findViewById(R.id.lancarvenda_produto_item_btnadicionar);
        adicionar.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                sAdaptador = (LancarVendaCarrinhoListViewAdapter)lsvCarrinho.getAdapter();
                sCarrinhoAuxiliar = sAdaptador.getItemList();

                LancarVendaProdutosFragment.sProdutos.getDadosProduto().setQuantidade(Double.valueOf(quantidade.displayTextView.getText().toString()));

                sCarrinhoAuxiliar.add(LancarVendaProdutosFragment.sProdutos.getDadosProduto());

                LancarVendaProdutosTabBarActivity sActivity = ((LancarVendaProdutosTabBarActivity)mContext);

                LancarVendaCarrinhoFragment sFragment =
                        (LancarVendaCarrinhoFragment)sActivity.getSupportFragmentManager().getFragments().get(1);
                sFragment.CarregarDados();

                Toast toast = Toast.makeText(v.getContext(),"Produto adicionado ao carrinho", Toast.LENGTH_LONG);
                View toastView = toast.getView();
                toastView.setBackgroundResource(R.drawable.toast_message_style);
                toast.show();
                notifyDataSetChanged();
            }
        });