java如何使用2项筛选我的recyclerview？

Question

我有一个recyclerview和2个城市列表（出发城市和目的地城市列表）。我想从第一个列表中选择一个城市，然后从第二个列表中选择目的地城市，然后recyclerview已被筛选，仅显示带有此起点和目的地城市的项目。问题是：当我选择“起点城市”时，recyclerview变为空，而在选择“终点城市”后，它会工作。当我选择第一个城市时，我希望recyclerview显示具有此原始城市的项目，并且不会变为空。 这是我的过滤器功能：

public void filter()
{
    String filterOrigin = txtOriginCity.getText().toString();
    String filterDestination = txtDestinationCity.getText().toString();

    for (int i = 0; i < freightsList.size(); i++)
        hold.add(freightsList.get(i));

    freightsList.clear();

    if (filterDestination.equals("allCities") && filterOrigin.equals("allCities"))

        freightsList.addAll(hold);

    else if (filterDestination.equals("allCities") || filterOrigin.equals("allCities"))
    {
        for (int i = 0; i < hold.size(); i++)
        {
            if (hold.get(i).getDestination_city().equals(filterDestination)
                    ||
                    hold.get(i).getOrigin_city().equals(filterOrigin))
            {
                freightsList.add(hold.get(i));
            }
        }
    } else if (!(filterDestination.equals("allCities") && filterOrigin.equals("allCities")))
    {
        for (int i = 0; i < hold.size(); i++)
        {
            if (hold.get(i).getDestination_city().equals(filterDestination)
                    &&
                    hold.get(i).getOrigin_city().equals(filterOrigin))
            {
                freightsList.add(hold.get(i));
            }
        }
    }

    adapter.notifyDataSetChanged();
}

Answer 1

您要查找的代码如下：

public void filter()
{
    String filterOrigin = txtOriginCity.getText().toString();
    String filterDestination = txtDestinationCity.getText().toString();

    for (int i = 0; i < freightsList.size(); i++)
        hold.add(freightsList.get(i));

    freightsList.clear();

    if (filterDestination.equals("allCities") && filterOrigin.equals("allCities"))

        freightsList.addAll(hold);

    else 
    {
        for (int i = 0; i < hold.size(); i++)
        {
            if (hold.get(i).getDestination_city().equals(filterDestination)
                    ||
                    hold.get(i).getOrigin_city().equals(filterOrigin))
            {
                freightsList.add(hold.get(i));
            }
        }
    }

    adapter.notifyDataSetChanged();
}