Get date from datepicker using dialogfragment

Question

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);     } 

Answer 1

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     }     ... }