Recyclerview：如何将原始列表中的原始适配器位置保留在已过滤的列表中？

Question

我在Adapter文件中有一个CardView项目的RecyclerView列表和一个onClickListener（），通过onItemClick（）在MainActivity中使用它来启动CardViewDetails活动。一切正常。然后我添加了一个Spinner来根据一个标准过滤CardViews。过滤按预期工作。但是，现在当我点击过滤列表中的CardView时，CardViewDetails活动中向用户显示了错误的CardView。

例如，假设我在RecyclerView列表中有15个CardView项目。并假设我在Spinner下拉列表中进行选择，将列表过滤为三个CardView。假设我现在点击过滤列表中的第二个CardView，并且CardView项目是原始RecyclerView列表中的最后 CardView。用户界面按预期进入CardViewDetails活动，但返回原始列表中的第二个CardView，而不是原始列表中我预期的最后一个CardView。

在使用微调器选择过滤列表后适配器更新时，如何使用原始RecyclerView列表返回ViewHolder中的原始适配器位置？我应该制作原始列表的副本，并以某种方式使用适配器文件中的复制列表吗？

public class MyRecylerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    public List<ListItem> listItems;
    public Context context;
    private RecyclerItemClickListener recyclerItemClickListener;

    public MyRecylerAdapter(Context context) {
        this.context = context;
        this.listItems = new ArrayList<>();
    }

    public Context getContext() {
        return context;

    public void setOnItemClickListener(RecyclerItemClickListener recyclerItemClickListener) {
        this.recyclerItemClickListener = recyclerItemClickListener;
    }

    // Do R. list filtering from MainActivity.
    public ArrayList<ListItem> filter2(List<ListItem> listItems, String filterType) {

        final ArrayList<ListItem> filteredModelList2 = new ArrayList<>();
        for (ListItem item : listItems) {
            final String cardTypeTest = item.getType();

            if (cardTypeTest.equals(filterType)) {
                filteredModelList2.add(item);
            }
        }
        return filteredModelList2;
    }

    public void setFilter(ArrayList<ListItem> listItem) {
        listItems = new ArrayList<>();
        listItems.addAll(listItem);
        notifyDataSetChanged();
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_contact_item, parent,false);
        final ItemHolder itemHolder = new ItemHolder(view);

        // Attach a Click listener to the items's (row) view.
        // onItemClick is the click method in MainActivity.
        itemHolder.itemView.setOnClickListener(new View.OnClickListener() {
            // Handles the row being clicked.
            @Override
            public void onClick(View view) {

                int adapterPos = itemHolder.getAdapterPosition(); // get the item position.
                if (adapterPos != RecyclerView.NO_POSITION) {
                    if (recyclerItemClickListener != null) {
                        recyclerItemClickListener.onItemClick(itemHolder.itemView,adapterPos);
                    }
                }
            }
        });
    return itemHolder;
    }

RecyclerItemClickListener.java

public interface RecyclerItemClickListener {

    void onItemClick(View view, int position);

}

MainActivity

public class MainActivity extends AppCompatActivity implements
    RecyclerItemClickListener {

    private MyRecylerAdapter adapter;
    private List<ListItem> allList = null; 
    private Spinner spinner2;    
    private ArrayList<ListItem> filteredModelList0 = null;

    ...
    // Set up a spinner instance and apply an OnItemSelectedListener on it.
    spinner2 = (Spinner) findViewById(R.id.skycard_filter);
    final String[] spinnerItems2 = getResources().getStringArray(R.array.skycard_filters);
    // Create an ArrayAdapter using the string array and a default spinner layout        
    final CustomAdapter<String> adapter2 = new CustomAdapter<>
            (this,android.R.layout.simple_spinner_item, spinnerItems2);
    adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    // Apply the adapter to the spinner
    spinner2.setAdapter(adapter2);

    spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view,
            int position, long id) {

            final String type = "CardView Type";
            filteredModelList0 = adapter.filter2(adapter.listItems,type);
            ...

            switch (position) {                        
                    case 0:
                        adapter.clear();
                        adapter.addAll(allList);
                        // Need to filter the entire R. list
                        filteredModelList0 = adapter.filter2(adapter.listItems, type);
                        adapter.setFilter(filteredModelList0);
                    break;
    ...
    }

    @Override
    public void onItemClick(View view,int position) {        

        // Create a new intent to send data from this MainActivity to the CardViewDetails Activity.
        Intent intent = new Intent(this,CardViewDetails.class);
        // Send the position of the CardView item that was clicked on through 
        // the intent.
        intent.putExtra("position",position);
        startActivity(intent);
        finish();
    }