Question

在我的适配器类中，我使用了两个全局变量。

public static String prevYearSelected =“”，currentYearSelected =“”;

如果我的方法，基于两个条件，我将值分配给两个变量。

代码：

public static String prevYearSelected = "",currentYearSelected = "";

if (selectedMonth.equalsIgnoreCase("01")) {

    if(isCurrentYearSelected == true)
    {
        currentYearSelected = selectedDate + " " + "Januari" + " " + selectedYear;
    }
    else
    {
        prevYearSelected = selectedDate + " " + "Januari" + " " + selectedYear + " " + "-";
    }
    selectedDateTV.setText(prevYearSelected+currentYearSelected);
}
if (selectedMonth.equalsIgnoreCase("02")) {
    if(isCurrentYearSelected == true)
    {
        currentYearSelected = selectedDate + " " + "Februari" + " " + selectedYear;

    }
    else
    {
        prevYearSelected = selectedDate + " " + "Februari" + " " + selectedYear + " " + "-";
    }
    selectedDateTV.setText(prevYearSelected+currentYearSelected);
}

实际上，根据日历中的年份选择，我将值传递给全局参数。例如，如果我选择了2018年3月5日，那么我将在当前年份中通过该值，如果我选择2017年3月8日，那么我将该值传递给prevYearSelected。

但问题是当我将两个值都设置为textview时，它显示其中一个值为null ...即如果我选择2017日期，则当前值显示为null，如果我选择2018 date然后显示prev值为null。我真的不明白为什么全局变量返回空值而不是持久化数据。

我真的非常感谢你们的帮助。

谢谢

Answer 1

试试这个：

public static String prevYearSelected = "",currentYearSelected = "";

if (selectedMonth.equalsIgnoreCase("01")) {

    if(isCurrentYearSelected == true)
    {
        currentYearSelected = selectedDate + " " + "Januari" + " " + selectedYear;
        prevYearSelected = selectedDate + " " + "Januari" + " " + (selectedYear - 1) + " " + "-";
    }
    else
    {
        prevYearSelected = selectedDate + " " + "Januari" + " " + selectedYear + " " + "-";
        currentYearSelected = selectedDate + " " + "Januari" + " " + (selectedYear + 1);
    }
    selectedDateTV.setText(prevYearSelected+currentYearSelected);
}
if (selectedMonth.equalsIgnoreCase("02")) {
    if(isCurrentYearSelected == true)
    {
        currentYearSelected = selectedDate + " " + "Februari" + " " + selectedYear;
        prevYearSelected = selectedDate + " " + "Februari" + " " + (selectedYear - 1) + " " + "-";
    }
    else
    {
        prevYearSelected = selectedDate + " " + "Februari" + " " + selectedYear + " " + "-";
        currentYearSelected = selectedDate + " " + "Februari" + " " + (selectedYear + 1);
    }
    selectedDateTV.setText(prevYearSelected+currentYearSelected);
}

全球价值数据不持久

1 个答案: