How to create datePicker and timePicker dialogs in fragment class?

Expanding on Codejoy’s answer:

Here is my DatePickerDialogFragment class:

public class DatePickerDialogFragment extends DialogFragment {
    private Fragment mFragment;

    public DatePickerDialogFragment(Fragment callback) {
        mFragment = callback;
    }

     public Dialog onCreateDialog(Bundle savedInstanceState) {
         return new DatePickerDialog(getActivity(), (OnDateSetListener) mFragment, 1980, 7, 16);
     }
}

(Notice that the constructor accepts the fragment that is using this dialog – and that we use this reference for the callback listener field for DatePickerDialog)

My fragment then just implements onDateSetListener:

public class SignupFragment extends Fragment implements OnDateSetListener {
...
public void onDateSet(DatePicker view, int year, int monthOfYear,
            int dayOfMonth) {
    // do stuff with the date the user selected
}
}

… and then I show the dialog from my Fragment like so:

FragmentTransaction ft = getFragmentManager().beginTransaction();
DialogFragment newFragment = new DatePickerDialogFragment(this);
newFragment.show(ft, "dialog");

Not sure if this is the best way to do it, but seems to work fine.