Question

下面的代码片段“正常”，正确地更新了statusDateID。我遇到的问题是，虽然它正确设置了statusDateID，但日期不会持久，当我更新mh.entryDate时，它始终是当前日期。

如何在对话框之外获取日期。这样我就可以用所选日期更新mh.entryDate，而不是当前日期。

感谢您的时间。

fun changeDate(view: View) {

    var date: Calendar = Calendar.getInstance()
    var thisAYear = date.get(Calendar.YEAR).toInt()
    var thisAMonth = date.get(Calendar.MONTH).toInt()
    var thisADay = date.get(Calendar.DAY_OF_MONTH).toInt()

    val dpd = DatePickerDialog(this, DatePickerDialog.OnDateSetListener { view2, thisYear, thisMonth, thisDay ->
        // Display Selected date in textbox
        thisAMonth = thisMonth + 1
        thisADay = thisDay
        thisAYear = thisYear

        statusDateID.setText("Date: " + thisAMonth + "/" + thisDay + "/" + thisYear)
        val newDate:Calendar =Calendar.getInstance()
        newDate.set(thisYear, thisMonth, thisDay)

    }, thisAYear, thisAMonth, thisADay)
    dpd.show()

    mh.entryDate = date.timeInMillis
    println("DATE DATA: "+thisAYear+ " "+thisAMonth+" " + thisADay)
    println("DATE CHANGED MILLISECS = "+mh.entryDate)
}

mh.entryDate被定义为全局，并且是LONG。使用调试println语句，DATE DATA和DATE CHANGED MILLISECS都显示当前日期。

Answer 1

只需在DatePickerDialog.OnDateSetListener方法中设置日期即可 mh.entryDate = newDate.timeInMillis

val dpd = DatePickerDialog(this, DatePickerDialog.OnDateSetListener { view2, thisYear, thisMonth, thisDay ->
    // Display Selected date in textbox
    thisAMonth = thisMonth + 1
    thisADay = thisDay
    thisAYear = thisYear

    statusDateID.setText("Date: " + thisAMonth + "/" + thisDay + "/" + thisYear)
    val newDate:Calendar =Calendar.getInstance()
    newDate.set(thisYear, thisMonth, thisDay)
    mh.entryDate = newDate.timeInMillis // setting new date
}, thisAYear, thisAMonth, thisADay)
dpd.show()

Answer 2

您正在将date对象作为日历中的新实例进行实例化，但您不会使用选择器中的日期更新它。 date已创建，查询，但从未更新。

从Kotlin Android中的DatePickerDialog获取日期

2 个答案: