Eu tenho um ExpandableListView de itens e no item da lista eu tenho o TextView com dois botões para aumentar ou diminuir o valor no TextView nos cliques. O problema ocorre toda vez que tento rolar a lista. Se eu incrementar um item e, em seguida, rolar a lista, os valores serão misturados (porque o ListView continua reciclando suas visualizações) e não sei como corrigi-lo.

Eu tentei muitas soulutions que encontrei aqui, então sim, isso pode ser uma duplicação, mas não consegui resolver meu problema com qualquer método que encontrei.

My ExpandableListAdapter.java

    import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.Button;
import android.widget.TextView;

import java.util.HashMap;
import java.util.List;


public class ExpandableListAdapter extends BaseExpandableListAdapter {

public static class ViewHolder {
    TextView childText;
    TextView counterText;
    Button addItemButton;
    Button deleteItemButton;

    int quantity = 0;

}


private Context context;
private List<String> listDataHeader;
private HashMap<String, List<String>> listHashMap;

public ExpandableListAdapter(Context context, List<String> listDataHeader, HashMap<String, List<String>> listHashMap) {
    this.context = context;
    this.listDataHeader = listDataHeader;
    this.listHashMap = listHashMap;
}

@Override
public int getGroupCount() {
    return listDataHeader.size();
}

@Override
public int getChildrenCount(int groupPosition) {
    return listHashMap.get(listDataHeader.get(groupPosition)).size();
}

@Override
public Object getGroup(int groupPosition) {
    return listDataHeader.get(groupPosition);
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    return listHashMap.get(listDataHeader.get(groupPosition)).get(childPosition);
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);

    if(convertView == null) {
        LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.list_group, null);

    }
    TextView listHeader = (TextView) convertView.findViewById(R.id.list_header);
    listHeader.setTypeface(null, Typeface.BOLD);
    listHeader.setText(headerTitle);

    return convertView;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

    final ViewHolder viewHolder;

    if(convertView == null) {
        LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.list_item, null);

        TextView textListChild = (TextView) convertView.findViewById(R.id.list_item_header);
        TextView itemsCounter = (TextView) convertView.findViewById(R.id.items_counter);
        Button addItemButton = (Button) convertView.findViewById(R.id.plus_btn);

        viewHolder = new ViewHolder();
        viewHolder.childText = textListChild;
        viewHolder.counterText = itemsCounter;
        viewHolder.addItemButton = addItemButton;

        convertView.setTag(viewHolder);


    } else {
        viewHolder = (ViewHolder) convertView.getTag();

    }

    final String childText = (String) getChild(groupPosition, childPosition);
    viewHolder.childText.setText(childText);

    viewHolder.addItemButton.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            //int itemCount = Integer.parseInt((String)viewHolder.counterText.getText());
            //itemCount++;

            viewHolder.quantity++;
            viewHolder.counterText.setText( Integer.toString(viewHolder.quantity));

            PutOrderDrinks.addOrder(childText);

        }
    });


    return convertView;
}

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
       return true;
    } 
}