Picking date with Fragment.

DatePickerFragment.java

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.DialogFragment;

import java.util.Calendar;

public class DatePickerFragment extends DialogFragment {

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle params) {

        int year, month, day;

        final Calendar c;
        if (getArguments() != null) {
            // set the date that is sent with params
            c = (Calendar) getArguments().getSerializable("date");
        } else {
            // set the date to the current date
            c = Calendar.getInstance();
        }

        year = c.get(Calendar.YEAR);
        month = c.get(Calendar.MONTH);
        day = c.get(Calendar.DAY_OF_MONTH);

        try {
            return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) getTargetFragment(), year, month, day);
        } catch (ClassCastException cce) {
            throw new RuntimeException("The fragment that uses the DatePickerFragment must implement DatePickerDialog.OnDateSetListener.");
        }
    }
}

EditProfileFragment.java

public class EditProfileFragment extends Fragment implements DatePickerDialog.OnDateSetListener {

    private final String TAG = "CompleteProfileInfoFragment";

    private Calendar birthDate;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_complete_profile, container, false);

        vBirthDate = (Button) view.findViewById(R.id.birthdate);
        vBirthDate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showDatePickerDialog();
            }
        });
        
        return view;
    }

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

        birthDate = Calendar.getInstance();
        birthDate.set(Calendar.YEAR, year);
        birthDate.set(Calendar.MONTH, monthOfYear);
        birthDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);

        vBirthDate.setText(new SimpleDateFormat("dd-MM-y").format(birthDate.getTime()));
        vBirthDate.setHint("");
    }

    public void showDatePickerDialog() {
        DialogFragment newFragment = new DatePickerFragment();
        if (birthDate != null) {
            Bundle bundle = new Bundle();
            bundle.putSerializable("date", birthDate);
            newFragment.setArguments(bundle);
        }
        newFragment.setTargetFragment(this, 0);
        newFragment.show(getActivity().getSupportFragmentManager(), "datePicker");
    }

}