Ajuda no desenvolvimento de uma expandable list view

package com.example.sesi2018.busu.Activity;

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.TextView;

import com.example.sesi2018.busu.R;

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

/**
 * Created by sesi2018 on 26/04/2018.
 */

public class ExpandableListAdapter extends BaseExpandableListAdapter {
    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 lblListHeader = (TextView)convertView.findViewById(R.id.lblListHeader);
        lblListHeader.setTypeface(null, Typeface.BOLD);
        lblListHeader.setText(headerTitle);
        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
      final String childText = (String)getChild(groupPosition, childPosition);
        if (convertView == null){
            LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.list_item,null);
        }

        TextView txtListChild = (TextView)convertView.findViewById(R.id.lblListItem);
        txtListChild.setText(childText);
        return convertView;
    }

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

package com.example.sesi2018.busu.Activity;

import android.content.Intent;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ExpandableListView;

import com.example.sesi2018.busu.R;

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

public class Turi extends AppCompatActivity {

    private ExpandableListView listView;
    private  ExpandableListAdapter listAdapter;
    private List<String> listDataHeader;
    private HashMap<String, List<String>> listHash;


    private ArrayAdapter<String> horariosadap;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_turi);

        listView = (ExpandableListView) findViewById(R.id.lvExp);

        initData();
        listAdapter = new ExpandableListAdapter(this,listDataHeader,listHash);
        listView.setAdapter(listAdapter);




   getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setTitle("Linhas - Turi");



        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                int posicaoClick = position;
                String conteudoClick = (String) listView.getItemAtPosition(posicaoClick);
                if(conteudoClick.equals("Isso é uma Expandable ListView")){

                    Intent bla2 = new Intent(Turi.this, MainActivity.class);
                    startActivity(bla2);

                }
            }
        });






    }

    private void initData() {
        listDataHeader = new ArrayList<>();
        listHash = new HashMap<>();

        listDataHeader.add("Alvorada");
        listDataHeader.add("Barreiro");
        listDataHeader.add("Bela Vista");
        listDataHeader.add("Catavento");

        List<String> lista1 = new ArrayList<>();
        lista1.add("Alvorada -> Centro");
        lista1.add("Alvorada -> Shopping");

        List<String> lista2 = new ArrayList<>();
        lista2.add("1");
        lista2.add("2");
        lista2.add("3");


        List<String> lista3 = new ArrayList<>();
        lista3.add("33");
        lista3.add("22");


        List<String> lista4 = new ArrayList<>();
        lista4.add("5");
        lista4.add("4");
        lista4.add("3");
        lista4.add("2");
        lista4.add("1");

        listHash.put(listDataHeader.get(0),lista1);
        listHash.put(listDataHeader.get(1),lista2);
        listHash.put(listDataHeader.get(2),lista3);
        listHash.put(listDataHeader.get(3),lista4);


    }




    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public boolean onOptionsItemSelected(MenuItem item){
        switch(item.getItemId()){
            case android.R.id.home:
                startActivity(new Intent(Turi.this,Horarios.class));
                finishAffinity();
                break;
            default:
                break;
        }
        return true;
    }


}