android - 最后选择的日期未进入日期选择器对话框

Question

在我的应用程序中，我有一个日期选择器，我可以在 textview 中选择和设置所选日期，但问题是如果我再次单击 textview 以打开日期选择器对话框，它总是显示当前日期而不是上次选择的日期。 .那么问题是什么？

  public class MainActivity extends Activity {

private TextView date_dropdown;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    date_dropdown=(TextView)findViewById(R.id.shows_dt);
    
    
    Calendar calendar = Calendar.getInstance();

    date_dropdown.setText(calendar.get(Calendar.DAY_OF_MONTH) + "-"
            + (calendar.get(Calendar.MONTH) + 1) + "-"
            + calendar.get(Calendar.YEAR));

    date_dropdown.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            showDatePickerDialog();
        }
    });
}

public void showDatePickerDialog() {

    System.out.println("show date picke dilg ");
    System.out.println("show date picke dilg");

    DialogFragment newFragment1 = new SelectDateFragment();
    newFragment1.show(getFragmentManager(), "DatePicker");
}

public class SelectDateFragment extends DialogFragment implements
        DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar calendar = Calendar.getInstance();
        int yy = calendar.get(Calendar.YEAR);
        int mm = calendar.get(Calendar.MONTH);
        int dd = calendar.get(Calendar.DAY_OF_MONTH);
        return new DatePickerDialog(getActivity(), this, yy, mm, dd);
    }

    public void onDateSet(DatePicker view, int yy, int mm, int dd) {
        populateSetDate(yy, mm + 1, dd);
    }

    public void populateSetDate(int year, int month, int day) {
        date_dropdown.setText(day + "-" + month + "-" + year);
    }

}

Answer 1

在您给出的行下方仅获取当前日期，所以你只会得到当前日期。

 date_dropdown.setText(calendar.get(Calendar.DAY_OF_MONTH) + "-"
        + (calendar.get(Calendar.MONTH) + 1) + "-"
        + calendar.get(Calendar.YEAR));

在共享首选项中保存您选择的日期，然后在您的 TextView 中显示