安卓日期选择器（微调器）无法正确显示

Question

我按如下所示初始化日期选择器：

    if (question.getAnswers().size() > 0) {
        EBotAnswer ans = question.getAnswers().get(0);

        try {
            if (ans.hasMinDate()) {
                picker.setMinDate(ans.getMinDateInLocalDate().getTimeInMillis());
            }
        } catch (IllegalArgumentException e) {
        }
        try {
            if (ans.hasMaxDate()) {
                picker.setMaxDate(ans.getMaxDateInLocalDate().getTimeInMillis());
            }
        } catch (IllegalArgumentException e) {
        }

        Calendar startWithDate = null;
        if (ans.hasStartWithDate()) {
            startWithDate = ans.getStartWithDateInLocalDate();
        } else if (ans.defaultCalendarDateMin()) {
            startWithDate = ans.getMinDateInLocalDate();
        } else if (ans.defaultCalendarDateMax()) {
            startWithDate = ans.getMaxDateInLocalDate();
        } else if (ans.defaultCalendarDateStartWith()) {//This is somewhat redundant
            startWithDate = ans.getStartWithDateInLocalDate();
        }
        if (startWithDate != null) {
            picker.updateDate(
                    startWithDate.get(Calendar.YEAR),
                    startWithDate.get(Calendar.MONTH),
                    startWithDate.get(Calendar.DAY_OF_MONTH));
        }
    }

但是最初，布局看起来像这样：

如果我开始转动日间微调器，则会显示7月8日。

为什么会这样？

我尝试致电picker.invalidate()或picker.requestLayout()甚至是picker.requestFocus()，但似乎没有任何作用。

Answer 1

检查startWithDate.get(Calendar.DAY_OF_MONTH)的值。对于您应用于DatePicker的情况，例如最大范围，可能无效。

为正确处理，您可以显示最小日期或最大日期，以防输入超出范围

if (startWithDate != null
        && (startWithDate.getTimeInMillis() < picker.getMaxDate())
        && (startWithDate.getTimeInMillis() > picker.getMinDate())) {
    picker.updateDate(
            startWithDate.get(Calendar.YEAR),
            startWithDate.get(Calendar.MONTH),
            startWithDate.get(Calendar.DAY_OF_MONTH));
} else {
    // In case of invalid date set it to minimum
    startWithDate.setTimeInMillis(picker.getMinDate());
    // Or if you want to set it to maximum
    // startWithDate.setTimeInMillis(picker.getMaxDate());
    picker.updateDate(
            startWithDate.get(Calendar.YEAR),
            startWithDate.get(Calendar.MONTH),
            startWithDate.get(Calendar.DAY_OF_MONTH));
}