I overwrite ArrayList into ArrayAdapter, how to do it right?

Question

Java

Good, I wrote my own adapter for AppCompatAutoCompleteTextView, the search works, but I overwrite the data in the ArrayList when searching, and if I delete the text from the field, the search result remains the same, how to do a search by input? here is the code

package www.finefood.ExpansionEditText;


import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.TextView;

import java.util.ArrayList;

import www.finefood.R;

public class MyArrayAdapter extends ArrayAdapter<MyForArrayAdapter> {

    private ArrayList<MyForArrayAdapter> list = new ArrayList<>();
    private Activity context;
    private Integer resource;
    private LayoutInflater inflater;

    public MyArrayAdapter(Context context, int resource,
                          ArrayList<MyForArrayAdapter> list1) {
        super(context, resource, list1);
        this.resource = resource;
        this.context = (Activity) context;
        this.list = list1;
        inflater = this.context.getLayoutInflater();
    }

    private MyFilter filter;

    @Override
    public Filter getFilter() {
        if (filter == null)
            filter = new MyFilter();
        return filter;
    }

    static class ViewHolder {
        protected TextView text;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view;
        String str = list.get(position).getNameProduct();
        ViewHolder viewHolder;
        if (convertView == null) {
            view = inflater.inflate(resource, null);
            viewHolder = new ViewHolder();
            viewHolder.text = (TextView) view.findViewById(R.id.text_view_array_adapter);
            view.setTag(viewHolder);
        } else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }
        if (viewHolder != null)
            viewHolder.text.setText(str);
        return view;
    }

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

    @Override
    public MyForArrayAdapter getItem(int position) {
        return list.get(position);
    }

    private class MyFilter extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence charSequence) {
            charSequence = charSequence.toString().toLowerCase();
            FilterResults results = new FilterResults();
            if (charSequence.toString().length() > 0) {
                ArrayList<MyForArrayAdapter> tempList = new ArrayList<>();
                for (int i = 0; list.size() > i; ++i) {
                    MyForArrayAdapter myArrayAdapter = list.get(i);
                    if (myArrayAdapter.getNameProduct().toLowerCase().contains(charSequence))
                        tempList.add(myArrayAdapter);
                }
                results.count = tempList.size();
                results.values = tempList;
            } else {
                synchronized (this) {
                    results.count = list.size();
                    results.values = list;
                }
            }
            return results;
        }
//этот код содрал с какого-то сайта, но там использовался  ArrayAdapter<String>
        @Override
        protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
            if (filterResults.values != null) {
                list = (ArrayList<MyForArrayAdapter>) filterResults.values;
                notifyDataSetChanged();
//проблема тут, тут очищается ArrayList, тем самым 
//затирается, если не очищать, то начинает заполняться 
//разрастаться после каждого введённого символа
                clear(); 
//
                    for (int i = 0; list.size() > i; i++)
                        add(list.get(i));
                notifyDataSetInvalidated();
            }
        }
    }
}

Answer 1

It is possible to create 2 arrayList in which there will be filtered elements and a copy of all elements. As soon as the user erases his request, we fill the array from the array with a copy. Example:

public class ItemAdapter extends RecyclerView.Adapter<ItemViewHolder> {
  private List<Item> mItemList = new ArrayList<>();
  private List<Item> mItemsCopy = new ArrayList<>();

   /**
   * Фильтрует отображаемые пользователю данные при вводе текста в поиск
   *
   * @param query the query
   */
  void filter(String query) {
    mItemList.clear();
    if (query.isEmpty()) {
      mItemList.addAll(mItemsCopy);
    } else {
      query = query.toLowerCase();
      for (Item item : mItemsCopy) {
          if (item.getUserName().toLowerCase().contains(query)) {
            mItemList.add(item);
          }
      }
    }
    notifyDataSetChanged();
  }

We hang a text watcher on the EditText and call the filter method of the adapter in onTextChanged and pass what the user entered.
The whole source of my adapter