How to have checkbox inside of a listview, to have a listener outside adapter activity?

So, i have menu items being displayed in listview, along with checkboxes, for the user to select which he likes. And i have an overhead cart icon which keeps track of no of checked items, by a function that is written in the adapter view.

My problem:

When i have implemented the cart increment function inside of OnItemClick listener, and then when i check a few items,it doesn't get updated unless i make a click outside of checkbox (anywhere else in the listview). I have tried disabling descendant focusability and modifying focusability as per other SO answers. They haven't solved my issue.

My calling activity

adapter = new MenuAdapter(CreateOrder.this,itemslist); listView.setAdapter(adapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                      selecteditems = adapter.getSelectedList();
                      Log.e("Selected Items",selecteditems.toString());
                      size = selecteditems.size();
                      qo.setText(String.valueOf(size));
                      Log.e("No of main items ",String.valueOf(size));


        }
    });

My Adapter class

public class MenuAdapter extends BaseAdapter {

Context mContext;
List<MainItem> linkedList;
protected LayoutInflater vi;

private boolean[] checkBoxState = null;
private int[] itemsqty;
private HashMap<MainItem, Boolean> checkedForItem = new HashMap<>();
public MenuAdapter(Context context, List<MainItem> linkedList) {
    this.mContext = context;
    this.linkedList = linkedList;
    itemsqty = new int[linkedList.size()];
    Arrays.fill(itemsqty,0);
    this.vi = (LayoutInflater)context.getSystemService(
            Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
    return linkedList.size();
}

@Override
public Object getItem(int position) {
    return null;
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    final ViewHolder holder;
    if (convertView == null) {
        convertView = vi.inflate(R.layout.row_layout, parent, false);
        holder = new ViewHolder();
        holder.iname = (TextView) convertView.findViewById(R.id.tvname);
        holder.iprice = (TextView) convertView.findViewById(R.id.tvprice);
        holder.selectionBox = (CheckBox) convertView.findViewById(R.id.checkBox);
        holder.plus = (TextView)convertView.findViewById(R.id.tvplus);
        holder.minus = (TextView)convertView.findViewById(R.id.tvminus);
        holder.qty = (TextView)convertView.findViewById(R.id.tvqty);
        convertView.setTag(holder);

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

    final MainItem item = linkedList.get(position);
    checkBoxState = new boolean[linkedList.size()];

    holder.iname.setText(item.getItemname());
    holder.iprice.setText(item.getItemprice());

    /** checkBoxState has the value of checkBox ie true or false,
     * The position is used so that on scroll your selected checkBox maintain its state **/
    if(checkBoxState != null)
        holder.selectionBox.setChecked(checkBoxState[position]);
    //new added 1
    if(itemsqty!=null)
    {
        holder.qty.setText(String.valueOf(itemsqty[position]));


    }

    holder.selectionBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(((CheckBox)v).isChecked()) {
                checkBoxState[position] = true;
                ischecked(position,true);

            }
            else {
                checkBoxState[position] = false;
                ischecked(position,false);
            }
        }
    });
    holder.plus.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Log.e("Plus clicked","at"+position);
            if(itemsqty[position]<=10)
                itemsqty[position]+=1;
            holder.qty.setText(String.valueOf(itemsqty[position]));
        }
    });
    holder.minus.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Log.e("Minus clicked ","at"+position);
            if(itemsqty[position]>0)
            {
                itemsqty[position]-=1;
                holder.qty.setText(String.valueOf(itemsqty[position]));
            }
        }
    });



    if (checkedForItem.get(item) != null) {
        holder.selectionBox.setChecked(checkedForItem.get(item));
    }

    /**Set tag to all checkBox**/
    holder.selectionBox.setTag(item);

    return convertView;
}
private class ViewHolder {
    TextView iname;
    TextView iprice;
    CheckBox selectionBox;
    TextView plus;
    TextView minus;
    TextView qty;
}

public void ischecked(int position,boolean flag )
{
    checkedForItem.put(this.linkedList.get(position), flag);
}

public int[] getselectedquantity()
{
    return itemsqty;
}

public LinkedList<MainItem> getSelectedList(){
    LinkedList<MainItem> selectedlist = new LinkedList<>();
    LinkedList<String> List = new LinkedList<>();
    for (Map.Entry<MainItem, Boolean> pair : checkedForItem.entrySet()) {
        if(pair.getValue()) {
            //List.add(pair.getKey().getItemname());
            for(int j=0;j<linkedList.size();j++)
            {
                if(linkedList.get(j).getItemname().equals(pair.getKey().getItemname()))
                {
                    pair.getKey().setQuantity(itemsqty[j]);
                    Log.e("quantity ## ",String.valueOf(itemsqty[j]));
                }
            }
            selectedlist.add(pair.getKey());
        }
    }
    return selectedlist;
}

}