task: make dialog to be displayed (for test)

import android.app.Activity;

import android.app.AlertDialog;

import android.app.FragmentManager;

import android.content.ActivityNotFoundException;

import android.content.ContentResolver;

import android.content.DialogInterface;

import com.android.calendar.event.EditEventActivity;

import com.android.calendar.event.ExtendedProperty;

import com.android.calendar.event.PickCalendarDialogFragment;

import com.android.calendar.icalendar.Attendee;

import com.android.calendar.icalendar.IcalendarUtils;

import com.android.calendar.icalendar.VCalendar;

public class ImportActivity extends Activity {

    private PickCalendarDialogFragment mPickCalendarDialog;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

            VEvent event = calendar.getAllEvents().getFirst();

            startInsertEventActivity(event);

        } else {

            final FragmentManager fragmentManager = getFragmentManager();

            if (fragmentManager != null) {

                mPickCalendarDialog = new PickCalendarDialogFragment();

                mPickCalendarDialog.show(fragmentManager, PickCalendarDialogFragment.FRAGMENT_TAG);

            }

            //todo handle multi event  insertion

        }

    }

import android.app.Activity;

import android.app.AlertDialog;

import android.app.Dialog;

import androidx.fragment.app.DialogFragment;

import android.app.DialogFragment;

import android.content.Context;

import android.os.Bundle;

import android.view.LayoutInflater;

public class PickCalendarDialogFragment extends DialogFragment {

    private static final String TAG = "PickCalendarDialogFragment";

    public static final String FRAGMENT_TAG = "PICK_CALENDAR_DIALOG";

    private AlertDialog mAlertDialog;

    Spinner mCalendarsSpinner;