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，我能够 select 并在 textview 中设置 selected 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 selected 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

您给定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

Answer 2

看起来你每次点击都在创建一个新对话框，这意味着 onCreateDialog 再次将日期设置为当前时间。你想要一个 class 变量 DialogFragment df，并在你的 showDatePickerDialog 中做这样的事情：

public void showDatePickerDialog() {
    if (df == null){
        // Only create a new fragment if one does not exist
        DialogFragment df = new SelectDateFragment();
    }
    df.show(getFragmentManager(), "DatePicker");
}

您还需要在 onPause 方法中存储用户选择的值，并在 onResume 中将 DialogFragment 设置为该值，以防您的用户离开您的应用程序正在输入信息。

Answer 3

您应该在 onCreate() 方法中定义日历实例，然后更新所有年份的月份和日期值 onDateSet()，因此当您再次打开日期选择器对话框时，它会显示之前选择的日期。

照这样做

  public class MainActivity extends Activity {

private TextView date_dropdown;

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


       final Calendar calendar = Calendar.getInstance();
        int yy1 = calendar.get(Calendar.YEAR);
        int mm1 = calendar.get(Calendar.MONTH);
        int dd1 = calendar.get(Calendar.DAY_OF_MONTH);

    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) {

        return new DatePickerDialog(getActivity(), this, yy1, mm1, dd1);
    }

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

         yy1 = yy ;
         mm1 = mm;
         dd1 = dd ;
    }

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

}

Answer 4

How to disable future date picker in android

 mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());


ed_date.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Calendar mcurrentDate=Calendar.getInstance();
                year=mcurrentDate.get(Calendar.YEAR);
                month=mcurrentDate.get(Calendar.MONTH);
                day=mcurrentDate.get(Calendar.DAY_OF_MONTH);

                final DatePickerDialog   mDatePicker =new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener()
                {
                    @Override
                    public void onDateSet(DatePicker datepicker, int selectedyear, int selectedmonth, int selectedday)
                    {
                              ed_date.setText(new StringBuilder().append(year).append("-").append(month+1).append("-").append(day));
                            int month_k=selectedmonth+1;

                    }
                },year, month, day);
                mDatePicker.setTitle("Please select date");
                // TODO Hide Future Date Here
                mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());

                // TODO Hide Past Date Here
                //  mDatePicker.getDatePicker().setMinDate(System.currentTimeMillis());
                mDatePicker.show();
            }
        });

Answer 5

 mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());


ed_date.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Calendar mcurrentDate=Calendar.getInstance();
                year=mcurrentDate.get(Calendar.YEAR);
                month=mcurrentDate.get(Calendar.MONTH);
                day=mcurrentDate.get(Calendar.DAY_OF_MONTH);

                final DatePickerDialog   mDatePicker =new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener()
                {
                    @Override
                    public void onDateSet(DatePicker datepicker, int selectedyear, int selectedmonth, int selectedday)
                    {
                              ed_date.setText(new StringBuilder().append(year).append("-").append(month+1).append("-").append(day));
                            int month_k=selectedmonth+1;

                    }
                },year, month, day);
                mDatePicker.setTitle("Please select date");
                // TODO Hide Future Date Here
                mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());

                // TODO Hide Past Date Here
                //  mDatePicker.getDatePicker().setMinDate(System.currentTimeMillis());
                mDatePicker.show();
            }
        });

Answer 6

通过在日期选择器中设置上一个选定日期来更新日期

mDatePicker.updateDate(1994, 6, 12);


mDatePicker.setTitle("Please select date");
mDatePicker.updateDate(1994, 6, 12);
mDatePicker.getDatePicker().setMaxDate(System.currentTimeMillis());

Answer 7

打印所选日期的简单方法是：

picker.addOnPositiveButtonClickListener {
    tv_date.text = "picker.headerText"
}

picker 是 DatePicker class 的对象。

最后选择的日期未进入日期选择器对话框

Last selected date is not getting in datepicker dialog

android

android-datepicker