I'm trying to send intent from fragment to MainActivity. But while doing startActivity(intent)

public class MainActivity extends AppCompatActivity {

    private String cityName;

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

        fragmentManage();


    }

    public void fragmentManage() {

        CityInformationFragment cityInformationFragment = new CityInformationFragment();
        CityList cityList = new CityList();


        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        fragmentTransaction.add(R.id.fragment2holder, cityList);
        fragmentTransaction.add(R.id.fragment1holder, cityInformationFragment);


        fragmentTransaction.commit();


        Intent intent = getIntent();
        cityName = intent.getStringExtra(CityList.PUT_EXTRA_KEY);

        Bundle bundle = new Bundle();
        bundle.putString(CityList.PUT_EXTRA_KEY, cityName);


        cityInformationFragment.setArguments(bundle);


    }

}

public class CityList extends Fragment implements AdapterView.OnItemClickListener {

  String[] cityList;
    ListView listView;
    protected static final String PUT_EXTRA_KEY = "city";



        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
            // arrayAdapter.addAll(cityList);

            cityList = getResources().getStringArray(R.array.cities);

            ArrayAdapter<CharSequence> arrayAdapter = new ArrayAdapter  <CharSequence>(getActivity(), android.R.layout.simple_list_item_1, cityList);
            View view = inflater.inflate(R.layout.citylistframent, container, false);

            listView = (ListView) view.findViewById(R.id.cityList);
            listView.setAdapter(arrayAdapter);
            listView.setOnItemClickListener(this);


        return view;
    }


    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        TextView textView = (TextView) view;

        String city = textView.getText().toString();
        Intent intent = new Intent(getActivity(), MainActivity.class);
        intent.putExtra(PUT_EXTRA_KEY, city);

        startActivity(intent);
    }
}

public class CityInformationFragment extends Fragment {

    String vancouver = "Vancouver, a bustling west coast seaport in British Columbia, is among Canada’s densest, most ethnically diverse cities." +
            " A popular filming location, it’s surrounded by mountains, and also has thriving art, theatre and music scenes." +
            " Vancouver Art Gallery is known for its works by regional artists, while the Museum of Anthropology houses preeminent First Nations collections.";

    String calgary = "Calgary, a cosmopolitan Alberta city with numerous skyscrapers, owes its rapid growth to its status as the centre of Canada’s oil industry. However," +
            " it’s still steeped in the western culture that earned it the nickname “Cowtown,”" +
            " evident in the Calgary Stampede, its massive July rodeo and festival that grew out of the farming exhibitions once presented here.";

    String kamloops = "Kamloops is a Canadian city in British Columbia, where the North and South Thompson rivers meet." +
            " Sun Peaks Resort’s hiking trails, bike park and numerous ski runs lie to the northeast. Cougars and bears inhabit the British Columbia Wildlife Park east of town." +
            " West, above Kamloops Lake are clay hoodoos (or spires). The riverside Secwepemc Museum & Heritage Park features the remains of a 2,000-year-old village.";

    String toronto = "Toronto, the capital of the province of Ontario, is a major Canadian city along Lake Ontario’s northwestern shore." +
            " It's a dynamic metropolis with a core of soaring skyscrapers, all dwarfed by the iconic, free-standing CN Tower. " +
            "Toronto also has many green spaces, from the orderly oval of Queen’s Park to 400-acre High Park and its trails, sports facilities and zoo.";

    String saskatoon = "Saskatoon is a city straddling the South Saskatchewan River in Saskatchewan, Canada. " +
            "North along the riverside Meewasin Trail is Wanuskewin Heritage Park, with exhibitions exploring indigenous culture. " +
            "On the trail’s southern stretch, native wildlife inhabit the prairie grasslands of Beaver Creek Conservation Area. " +
            "East of the river, the Saskatoon Forestry Farm Park & Zoo has manicured gardens and a children’s zoo.";

    TextView textView;
    String cityName = "";


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.cityinformation, container, false);

        textView = view.findViewById(R.id.cityInformation);

        cityName = getArguments().getString(CityList.PUT_EXTRA_KEY);
     //   Toast.makeText(getContext(), cityName, Toast.LENGTH_SHORT).show();
        setInformation();


        return view;
    }

    public String getVancouver() {
        return vancouver;
    }

    public String getCalgary() {
        return calgary;
    }

    public String getKamloops() {
        return kamloops;
    }

    public String getToronto() {
        return toronto;
    }

    public String getSaskatoon() {
        return saskatoon;
    }

    public void setInformation() {

        if (cityName != null) {

            if (cityName.equals("")) {
                textView.setText(getKamloops());
            } else if (cityName.equals("Calgary")) {
                textView.setText(getCalgary());
            } else if (cityName.equals("Kamloops")) {
                textView.setText(getKamloops());
            } else if(cityName.equals("Calgary")) {
                textView.setText(getCalgary());
            } else if(cityName.equals("Saskatoon")){
                textView.setText(getSaskatoon());
            } else if(cityName.equals("Toronto")) {
                textView.setText(getToronto());
            } else if(cityName.equals("Vancouver")){
                textView.setText(getVancouver());
            }

        } else {
            textView.setText(getKamloops());
        }
    }
}