Get date from datepicker using dialogfragment

I'm using the google example to insert a datepicker inside my app using a dialogfragment
http://developer.android.com/guide/topics/ui/controls/pickers.html

But I'm not sure how to get date after set it (not java expert). Dialog and datepicker runs ok and I can log that date is correctely set but, how can i do to get a callback executed on parent activity?

This is my Dialog fragment

public class DatePickerFragment extends DialogFragment implements
        DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        **Log.w("DatePicker","Date = " + year);**
    }
}

...and I call dialog from my activity with...

public void showDatePickerDialog(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getSupportFragmentManager(), "datePicker");
}

What is the correct way to call a method in my parent activity instead Log.w? I suppose that is something related with passing a callback as parameter or something but most of references I found on internet are about previous versions without dialogfragments

EDIT: not sure if it's important but parent activity is declared as:

public class EditSessionActivity extends FragmentActivity {

SOLUTION: thanks to Lecho user this is the way to do it

DatePickerFragmennt.class

public class DatePickerFragment extends DialogFragment{

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day);
    }

}

...and parent activity EditSessionActivity.class...

public class EditSessionActivity extends FragmentActivity implements OnDateSetListener {
...
    @Override
    public void onDateSet(DatePicker view, int year, int month, int day) {
        //do some stuff for example write on log and update TextField on activity
        Log.w("DatePicker","Date = " + year);
        ((EditText) findViewById(R.id.tf_date)).setText("Date = " + year);
    }

Constructor fo DatePickerDialog takes DatePickerDialog.OnDateSetListener as second parameter, so maybe you should implement that interface in your parent activity EditSessionActivity (not in DatePickerFragment ) and change this line:

return new DatePickerDialog(getActivity(), this, year, month, day);

into this:

return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day);

And then your activity should looks like this:

public class EditSessionActivity extends FragmentActivity implements
        DatePickerDialog.OnDateSetListener{

    public void onDateSet(DatePicker view, int year, int month, int day) {
        //use date in your activity
    }
    ...
}

I simple override onDateSet in date picker creation in my class that shows a date picker. See code below:

  private OnClickListener onDateClicked() {
    return new OnClickListener() {
          @Override
          public void onClick(View v) {
             DialogFragment newFragment = new DatePickerFragment() {
                @Override
                public void onDateSet(DatePicker view, int year, int month, int day) {
                  salePaymentCustomView.setBtDateText("" + day + "/" + month+1 + "/" + year);
                }
             };
             newFragment.show(getActivity().getSupportFragmentManager(), "datePicker");
    }
  };
 } 

The problem can also be solved without moving the onDateSet method to the parent activity. You just have to tell the DatePickerFragment where to search for the view:

public class DatePickerFragment extends DialogFragment implements
    DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        // do some stuff for example write on log and update TextField on activity
        Log.w("DatePicker","Date = " + year);
        ((TextView) getActivity().findViewById(R.id.tf_date)).setText("Date = " + year);
    }
}

I also changed the target of the cast from EditText to TextView. This way, you can reuse your implementation for different kinds of views, not only for an EditText.

i have one correction to the above answer. instead of return the DatePickerDialog like this

return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day);

you should return it in a more generic way

return new DatePickerDialog(getActivity(), (OnDateSetListener)getActivity(), year, month, day);

just make sure your activity implements OnDateSetListener interface and override the function onDateSet

@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth)