如何从我的DatePickerFragment传输日期字符串？

public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
    private OnDateSelectedListener mListener;

    public interface OnDateSelectedListener {
        void onDateSelected(String date);
    }

    // ...

    @Override
    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
        // 将日期转换为字符串
        String date = year + "-" + (month + 1) + "-" + dayOfMonth;

        // 调用回调方法传递日期字符串
        mListener.onDateSelected(date);
    }

    public void setOnDateSelectedListener(OnDateSelectedListener listener) {
        mListener = listener;
    }
}

public class MainActivity extends AppCompatActivity implements DatePickerFragment.OnDateSelectedListener {
    // ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // ...

        // 创建DatePickerFragment实例
        DatePickerFragment datePickerFragment = new DatePickerFragment();

        // 设置日期选择监听器
        datePickerFragment.setOnDateSelectedListener(this);

        // 显示DatePickerFragment
        datePickerFragment.show(getSupportFragmentManager(), "datePicker");
    }

    @Override
    public void onDateSelected(String date) {
        // 在这里处理接收到的日期字符串
        Log.d("Selected Date", date);
    }
}