Simple date picker dialog implementation

DateUtils.java

public class DateUtils {

    private static final String TAG = DateUtils.class.getSimpleName();

    public static String toddmmYYYY(Date date) {
        if (date != null) {
            SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
            return dateFormat.format(date);
        }
        return null;
    }

    public static String toYYYYmmdd(Date date) {
        if (date != null) {
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
            return dateFormat.format(date);
        }
        return null;
    }
    
}

TestActivity.java

public class TestActivity extends AppCompatActivity {

    // ---------------------------------------------------------------------------------------------
    // ---------------------------------------------------------------------------------------------
    // Constants
    // ---------------------------------------------------------------------------------------------
    // ---------------------------------------------------------------------------------------------

    private final static String TAG = TestActivity.class.getSimpleName();

    // ---------------------------------------------------------------------------------------------
    // ---------------------------------------------------------------------------------------------
    // Fields
    // ---------------------------------------------------------------------------------------------
    // ---------------------------------------------------------------------------------------------
    
    private Calendar mCalendar;

    // ---------------------------------------------------------------------------------------------
    // ---------------------------------------------------------------------------------------------
    // Methods
    // ---------------------------------------------------------------------------------------------
    // ---------------------------------------------------------------------------------------------

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

        mCalendar = Calendar.getInstance();
    }
    
    public void showDateDialog(View view) {
        DatePickerDialog mDatePicker =
                new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {

                    public void onDateSet(DatePicker datepicker,
                                          int selectedYear,
                                          int selectedMonth,
                                          int selectedDay) {
                        mCalendar.set(Calendar.YEAR, selectedYear);
                        mCalendar.set(Calendar.MONTH, selectedMonth);
                        mCalendar.set(Calendar.DAY_OF_MONTH, selectedDay);
                        mEditText.setText(DateUtils.toddmmYYYY(mCalendar.getTime()));
                    }

                }, mCalendar.get(Calendar.YEAR),
                        mCalendar.get(Calendar.MONTH), mCalendar.get(Calendar.DAY_OF_MONTH));

        mDatePicker.show();
    }

}