如何仅显示当前月份并预览在 datePickerDialog 中可选择的月份日期？答案

【问题标题】：How to show only current month and previews month's dates selectable in datePickerDialog?如何仅显示当前月份并预览在 datePickerDialog 中可选择的月份日期？
【发布时间】：2019-03-08 13:30:27
【问题描述】：

在日期选择器对话框中仅显示当前和上个月。

  datePickerDialog = new DatePickerDialog(DateConvertActivity.this, new DatePickerDialog.OnDateSetListener() {
  @Override
   public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
                    String s = "" + dayOfMonth + "-" + (month + 1) + "-" + year;
                    edtDate.setText(s);
            }
      }, mDay, mMonth, mYear);
            datePickerDialog.getDatePicker().updateDate(mYear, mMonth, mDay);

【问题讨论】：

标签： android datetimepicker datetimeformatinfo

【解决方案1】：

试试这个解决方案。从上个月的第一天到今天。

在 Kotlin 中：

private fun setupUi() {
    // Get calendar instance
    val calendar = Calendar.getInstance()

    // Get current time
    val currentYear = calendar.get(Calendar.YEAR)
    val currentMonth = calendar.get(Calendar.MONTH)
    val currentDay = calendar.get(Calendar.DAY_OF_MONTH)

    // Create listener
    val listener = DatePickerDialog.OnDateSetListener { view, year, month, day ->
        // Show Toast after selection
        Toast.makeText(this, "Selected: $day.$month.$year", Toast.LENGTH_SHORT).show()
    }

    // Max = current
    val maxTime = calendar.timeInMillis

    // Move day as first day of the month
    calendar.set(Calendar.DAY_OF_MONTH, 1)
    // Move "month" for previous one
    calendar.add(Calendar.MONTH, -1)

    // Min = time after changes
    val minTime = calendar.timeInMillis

    // Create dialog
    val datePickerDialog = DatePickerDialog(
        this,
        listener,
        currentYear,
        currentMonth,
        currentDay
    ).apply {
        // Set dates
        datePicker.maxDate = maxTime
        datePicker.minDate = minTime
    }

    // Show dialog
    datePickerDialog.show()
}

在 Java 中：

private void setupUi() {
    // Get calendar instance
    Calendar calendar = Calendar.getInstance();

    // Get current time
    int currentYear = calendar.get(Calendar.YEAR);
    int currentMonth = calendar.get(Calendar.MONTH);
    int currentDay = calendar.get(Calendar.DAY_OF_MONTH);

    // Create listener
    DatePickerDialog.OnDateSetListener listener = new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker view, int year, int month, int day) {
            // Show Toast after selection
            Toast.makeText(MainActivity.this, String.format("Selected: %s.%s.%s", day, month, year), Toast.LENGTH_SHORT).show();
        }
    };

    // Max = current
    long maxTime = calendar.getTimeInMillis();

    // Move day as first day of the month
    calendar.set(Calendar.DAY_OF_MONTH, 1);
    // Move "month" for previous one
    calendar.add(Calendar.MONTH, -1);

    // Min = time after changes
    long minTime = calendar.getTimeInMillis();

    // Create dialog
    DatePickerDialog datePickerDialog = new DatePickerDialog(
            this,
            listener,
            currentYear,
            currentMonth,
            currentDay
    );

    // Set dates
    datePickerDialog.getDatePicker().setMaxDate(maxTime);
    datePickerDialog.getDatePicker().setMinDate(minTime);

    // Show dialog
    datePickerDialog.show();
}

如果您需要整个当月（从第一天到最后一天），您可以将 par 替换为此 Kotlin 代码：

// Move day as first day of the month
calendar.set(Calendar.DAY_OF_MONTH, 1)
// Move "month" for previous one
calendar.add(Calendar.MONTH, -1)

// Min = time after changes
val minTime = calendar.timeInMillis


// Move day as first day of the month
calendar.set(Calendar.DAY_OF_MONTH, 1)
// Move to next month
calendar.add(Calendar.MONTH, +2)
// Go back one day (so last day of current month)
calendar.add(Calendar.DAY_OF_MONTH, -1)

// Max = current
val maxTime = calendar.timeInMillis

在 Java 中：

// Move day as first day of the month
calendar.set(Calendar.DAY_OF_MONTH, 1);
// Move "month" for previous one
calendar.add(Calendar.MONTH, -1);

// Min = time after changes
long minTime = calendar.getTimeInMillis();

// Move day as first day of the month
calendar.set(Calendar.DAY_OF_MONTH, 1);
// Move to next month
calendar.add(Calendar.MONTH, +2);
// Go back one day (so last day of current month)
calendar.add(Calendar.DAY_OF_MONTH, -1);

// Max = current
long maxTime = calendar.getTimeInMillis();

【讨论】：

【解决方案2】：

在时间戳中选择日期见下面的代码

Long tsLong = System.currentTimeMillis()

然后将tsLong 转换为任何特定格式并提取您需要的格式。

供参考：Android TimeStamp

【讨论】：

【解决方案3】：

datePickerDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);

【讨论】：

这不起作用。它仅显示当前日期和任何日期。