Not Working Spinner

AddServiceDialogFragment.java

package com.innozones.mms.liveartists.MyServices;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.TextInputLayout;
import android.support.v4.app.DialogFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
import com.innozones.mms.liveartists.R;
import com.innozones.mms.liveartists.data.model.serviceTypes.ServiceType;
import com.innozones.mms.liveartists.data.model.serviceTypes.ServiceTypesResponse;
import com.innozones.mms.liveartists.util.UrlBuilder;
import com.koushikdutta.async.future.FutureCallback;
import com.koushikdutta.ion.Ion;

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

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import butterknife.Unbinder;

public class AddServiceDialogFragment extends DialogFragment implements OnItemSelectedListener {
    private final String TAG = this.getClass().getSimpleName();

    @BindView(R.id.add_service_name_edit_text)
    TextInputLayout addServiceNameEditText;
    @BindView(R.id.add_service_type_spinner)
    Spinner addServiceTypeSpinner;
    @BindView(R.id.add_service_price_edti_text)
    TextInputLayout addServicePriceEdtiText;
    @BindView(R.id.add_service_button)
    Button addServiceButton;
    Unbinder unbinder;
    List<String> spinnerArray = new ArrayList<>();

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater,
                             @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_add_service_dialog, container, false);
        unbinder = ButterKnife.bind(this, v);

        fillSpinnerWithServiceTypes();
        addServiceTypeSpinner.setOnItemSelectedListener(this);
        return v;
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int i, long l) {
        Log.d(TAG, "onItemSelected: " + parent.getItemAtPosition(i).toString());
        addServiceTypeSpinner.setSelection(i);
    }

    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {
        Log.d(TAG, "onNothingSelected: NothingSelected");
    }

    private void fillSpinnerWithServiceTypes() {
        spinnerArray = getServiceTypes();

        ArrayAdapter<String> adapter =
                new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, spinnerArray);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        addServiceTypeSpinner.setAdapter(adapter);
    }

    @NonNull
    private List<String> getServiceTypes() {
        final List<String> spinnerArrayX = new ArrayList<>();
        Log.d(TAG, "Request to get Service Types");
        Ion.with(getActivity())
                .load(UrlBuilder.getServiceTypesUrl())
                .as(ServiceTypesResponse.class)
                .setCallback(new FutureCallback<ServiceTypesResponse>() {
                    @Override
                    public void onCompleted(Exception e, ServiceTypesResponse result) {
                        for(ServiceType serviceType: result.getServiceType())
                            spinnerArrayX.add(serviceType.getTitle());
                    }
                });
        return spinnerArrayX;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }

    @OnClick(R.id.add_service_button)
    public void onViewClicked() {
        // TODO network call
    }
}