android - 如何 bundle 以前的 DatePicker 字符串？

Question

我使用 DatePicker fragment 从用户那里获取日期。

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

DatePickerDialog picker = new DatePickerDialog(getActivity(),
    this, year, month, day);
return picker;

public void onDateSet(DatePicker view, int year, int month, int day) {

    final EditText txtDate;

    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.YEAR,year);
    calendar.set(Calendar.MONTH,month);
    calendar.set(Calendar.DAY_OF_MONTH,day);
    txtDate = (EditText) getActivity().getWindow().getDecorView().getRootView().findViewById(R.id.FEditText);

    String myFormat = "MM/dd/yy" + " ";  \\ *** formatted with "yy" to fit on EditText line rather than "yyyy"
    SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US);
    txtDate.setText(sdf.format(calendar.getTime()));        
}

在 MainActivity 中，我想获取原始的 DatePicker 日期，比如在 EditText 行上设置的 2017 年 2 月 28 日，并在用户单击日期进行编辑时将其作为当前日期放回 DatePicker fragment 中。 EditText 行将日期显示为年份的“yy”，因此为 02/28/17。我假设我需要将 EditText 数据从“yy”转换回“yyyy”以将日期部分放入一个包中，然后将日期设置到 DatePicker fragment 中。

fListenerEditText.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
    Calendar c = Calendar.getInstance();
    // Extract the previously entered date from the EditText line as a string
    String dateStr = fListenerEditText.getText().toString().replace(" ", "");

    String myFormat2 = "MM/dd/yyyy" + " ";  \\ *** I assume I need to put "yyyy" back into the DatePicker not "yy" so need to re-format the Date
    SimpleDateFormat sdf2 = new SimpleDateFormat(myFormat2, Locale.US);
    String formattedDate = sdf2.format(dateStr); \\ *** wrong here?

    String[]dateParts = formattedDate.split("/");
    c.set(Integer.parseInt(dateParts[2]),Integer.parseInt(dateParts[0])-1,Integer.parseInt(dateParts[1]));
    Bundle argsbundle = new Bundle();
    argsbundle.putInt("year", c.get(Calendar.YEAR));
    argsbundle.putInt("month", c.get(Calendar.MONTH));
    argsbundle.putInt("day", c.get(Calendar.DAY_OF_MONTH));
    DatePickerFragment newFragment = new DatePickerFragment();
    newFragment.setArguments(argsbundle);
    newFragment.show(getSupportFragmentManager(), "datePicker");

当我点击 EditText 行时，DatePicker 按预期打开，但我没有得到之前的日期，我得到的是 1900 年 1 月 1 日。我在这里缺少什么格式？

Answer 1

您可以使用 updateDate(yourSelectedDate) 方法更新您的 DatePickerDialog，如下所示:

在您的Activity 类中创建DatePickerDialog 的全局实例:

public class CustomDatePicker extends Activity implements DatePickerDialog.OnDateSetListener {


    private DatePickerDialog mDatePickerDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(...);
        //....
        Calendar uCal = Calendar.getInstance();

        mDatePickerDialog = new DatePickerDialog(this,
            this,
            uCal.get(Calendar.YEAR),
            uCal.get(Calendar.MONTH),
            uCal.get(Calendar.DAY_OF_MONTH));
    }

    @Override
    public void onDateSet(DatePicker view, int year, int month, int day) {
        mDatePickerDialog.updateDate(year, month, day);
    }
}

之后，使用 onDateSet 方法更新您的 mDPDialog 值(selectedYear、selectedMonth 和 selectedDay)