ExpandableListAdapter with searchView only Group

Question

I am preparing an app for our city to help people find what they want fast and offline. I am using ExpandableListAdapter with SearchView and I need to make only group items searchable.Is it possible to do that please ? ...

Here´s my code:

MainActivity.java

package com.martin.icmt;

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

import android.app.Activity;
import android.os.Bundle;
import android.widget.ExpandableListView;
import android.widget.SearchView;

import com.martin.icmt.com.martin.icmt.expandablelist.ExpandableListAdapter;

public class MainActivity extends Activity {
    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    SearchView search;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // get the listview
        expListView = (ExpandableListView) findViewById(R.id.lvExp);

        // preparing list data
        prepareListData();

        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

        // setting list adapter
        expListView.setAdapter(listAdapter);
    }

    /*
     * Preparing the list data
     */
    private void prepareListData() {
        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();

        // Adding child data
        listDataHeader.add("Nemocnica");
        listDataHeader.add("AKB Martinská Kaliareň");
        listDataHeader.add("TESCO Informačné Centrum");
        listDataHeader.add("Pizzeria Venezia");
        listDataHeader.add("Pizzeria Milano");
        listDataHeader.add("OC Tulip");

        // Adding child data
        List<String> Nemocnica = new ArrayList<String>();
        Nemocnica.add("Otváracie hodiny:                                            nonstop");
        Nemocnica.add("Telefón"+"                   0432 545 684");

        List<String> AKB = new ArrayList<String>();
        AKB.add("Otváracie hodiny:                                    06:00-18:00");
        AKB.add("Telefón"+"                 0524 456 545");

        List<String> TescoIC = new ArrayList<String>();
        TescoIC.add("Otváracie hodiny:                                            nonstop");
        TescoIC.add("Telefón"+"                 043 / 421 81 11");

        List<String> Venezia = new ArrayList<String>();
        Venezia.add("Otváracie hodiny:                                    06:00-18:00");
        Venezia.add("Telefón"+"                 043 / 430 4916");

        List<String> Milano = new ArrayList<String>();
        Milano.add("Otváracie hodiny:                                    08:00-22:00");
        Milano.add("Telefón"+"                 0907 391 404");

        List<String> Tulip = new ArrayList<String>();
        Tulip.add("Otváracie hodiny:                                    09:00-21:00");
        Tulip.add("Telefón" + "               043 / 424 15 00");

        listDataChild.put(listDataHeader.get(0), Nemocnica); // Header, Child data
        listDataChild.put(listDataHeader.get(1), AKB);
        listDataChild.put(listDataHeader.get(2), TescoIC);
        listDataChild.put(listDataHeader.get(3), Venezia);
        listDataChild.put(listDataHeader.get(4), Milano);
        listDataChild.put(listDataHeader.get(5), Tulip);
    }
}

ExpandableListAdapter.java

package com.martin.icmt.com.martin.icmt.expandablelist;

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

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.Filter;
import android.widget.TextView;

import com.martin.icmt.R;

public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Context _context;
    private List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap<String, List<String>> _listDataChild;

    public ExpandableListAdapter(Context context, List<String> listDataHeader,
                                 HashMap<String, List<String>> listChildData) {
        this._context = context;
        this._listDataHeader = listDataHeader;
        this._listDataChild = listChildData;
    }

    @Override
    public Object getChild(int groupPosition, int childPosititon) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .get(childPosititon);
    }

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

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

        final String childText = (String) getChild(groupPosition, childPosition);

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item, null);
        }

        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);

        txtListChild.setText(childText);
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .size();
    }

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

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

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

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        String headerTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group, null);
        }

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

        return convertView;
    }

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

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