Values of counter changes after scrolling ExpendableListView

Question

I have an ExpandableListView of items and on list item I have TextView with two buttons to increment or decrements the value in TextView on clicks. The problem occurs every

Answer 1

Try this adapter:

public class ExpandableListAdapter extends BaseExpandableListAdapter {

class ViewHolder {
    TextView childText;
    TextView counterText;
    Button addItemButton;
    Button deleteItemButton;
}

class ChildItem{
    String name;
    int quantity;
    ChildItem(String name, int quantity){
        this.name = name;
        this.quantity = quantity;
    }
}

class Pos{
    int group;
    int child;
    Pos(int group, int child){
        this.group = group;
        this.child = child;
    }
}

private Context context;
private List listDataHeader;
//private HashMap> listHashMap;
private HashMap> listChildMap;

public ExpandableListAdapter(Context context, List listDataHeader, HashMap> listHashMap) {
    this.context = context;
    this.listDataHeader = listDataHeader;
    listChildMap = new HashMap<>();
    for(int i=0; i listTemp = new ArrayList<>();
        for(int j=0; j