Android：DatePickerDialog和TimePickerDialog没有传递选择

Question

DatePickerDialog和TimePickerDialog都存在问题。用户可以使用加号或减号按钮选择日期和时间。这有效。但是当用户点击该字段时，他可以通过键盘设置值：

但这根本不起作用。当用户键入新值并单击“确定”按钮时，当前所选字段的值将不会传递给onDateSet方法。这既不适用于DatePickerDialog也不适用于TimePickerDialog。相反，用户需要单击键盘上的绿色前进按钮才能真正设置DatePickerDialog中的值。当他按“OK”然后，价值通过，但这是一个非常愚蠢的可用性。没有人会这样做。这就是我实现片段的方式：

public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener
{
    private final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    @Override
    public void onDateSet(DatePicker view, int year, int month, int day)
    {
        final Calendar calendar = Calendar.getInstance(Locale.getDefault());
        calendar.set(year, month, day);
        String pickedDate = dateFormat.format(calendar.getTime());

        ((MenuEditActivity)getActivity()).setMenuDate(pickedDate);
    }

    @Override
    public void onCancel(DialogInterface dialog)
    {
        super.onCancel(dialog);
    }
}

是否有人遇到同样的问题并且已经实施了一些快速的解决方法？ （我宁愿不想重新实现整个Picker对话框，只是这个半生不熟的实现）。

Answer 1

我找到DatePickerDialog的解决方法来禁用键盘，因此用户无法通过键盘输入日期。 （另见[Disable keyboard input on Android TimePicker）

   public class MyDatePickerDialog extends DatePickerDialog
    {
        public MyDatePickerDialog(Context context, OnDateSetListener listener, int year, int month, int dayOfMonth)
        {
            super(context, listener, year, month, dayOfMonth);
        }

        @NonNull
        @Override
        public DatePicker getDatePicker()
        {
            return super.getDatePicker();
        }
    }

片段中的

....

final MyDatePickerDialog datePickerDialog = new MyDatePickerDialog(getActivity(), this, year, month, day);
datePickerDialog.getDatePicker().setDescendantFocusability(DatePicker.FOCUS_BLOCK_DESCENDANTS);

但TimePickerDialog无法实现这一点，因为没有方法可以获取TimePicker，所以我使用了另一种解决方法来解决时间问题，感谢Mike M.

public class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener
{
    private TimePickerDialog timePickerDialog;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        //Default 6:00
        timePickerDialog = new TimePickerDialog(getActivity(), this, 6, 0, android.text.format.DateFormat.is24HourFormat(getActivity()));

        return timePickerDialog;
    }

    @Override
    public void onStart()
    {
        super.onStart();

        final View hourView = timePickerDialog.findViewById(Resources.getSystem().getIdentifier("hour", "id", "android"));
        final View minuteView = timePickerDialog.findViewById(Resources.getSystem().getIdentifier("minute", "id", "android"));

        if (hourView != null && hourView instanceof NumberPicker)
        {
            ((NumberPicker) hourView).setDescendantFocusability(TimePicker.FOCUS_BLOCK_DESCENDANTS);
        }

        if (minuteView != null && minuteView instanceof NumberPicker)
        {
            ((NumberPicker) minuteView).setDescendantFocusability(TimePicker.FOCUS_BLOCK_DESCENDANTS);
        }
    }

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute)
    {
        ((MenuEditActivity) getActivity()).setRecipeTime(hourOfDay, minute);
    }

    @Override
    public void onCancel(DialogInterface dialog)
    {
        super.onCancel(dialog);
    }
}

Answer 2

这对我有用：

@SuppressWarnings("deprecation")
@Override
public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
    timePicker.requestFocus();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        hour = timePicker.getHour();
        minute = timePicker.getMinute();
    } else {
        hour = timePicker.getCurrentHour();
        minute = timePicker.getCurrentMinute();
    }
}