Java Android Calendar 获取当前星期几作为字符串

Android Calendar get current day of week as string

提问by ntm

i tried to get a string with the name of the actual weekday this way:

我试图以这种方式获取带有实际工作日名称的字符串：

            Calendar c = Calendar.getInstance();
            int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);

            if (c.get(Calendar.MONDAY) == dayOfWeek) weekDay = "monday";
            else if (c.get(Calendar.TUESDAY) == dayOfWeek) weekDay = "tuesday";
            else if (c.get(Calendar.WEDNESDAY) == dayOfWeek) weekDay = "wednesday";
            else if (c.get(Calendar.THURSDAY) == dayOfWeek) weekDay = "thursday";
            else if (c.get(Calendar.FRIDAY) == dayOfWeek) weekDay = "friday";
            else if (c.get(Calendar.SATURDAY) == dayOfWeek) weekDay = "saturday";
            else if (c.get(Calendar.SUNDAY) == dayOfWeek) weekDay = "sunday";

but weekDaystays always null and i actually have no idea why because the debugger says that dayOfWeekis 5 so i should be equal to c.get(Calendar.THURSDAY)

但weekDay始终为空，我实际上不知道为什么，因为调试器说这dayOfWeek是 5，所以我应该等于c.get(Calendar.THURSDAY)

回答by arun_gopalan

You are supposed to compare dayOfWeek directly with Calendar.MONDAY etc. See code below

您应该将 dayOfWeek 直接与 Calendar.MONDAY 等进行比较。请参阅下面的代码

Also, I have put brackets around if else. Do not rely on indentation for code flow, explicitly put brackets even if your if-else has only one statement.

另外，我在 if else 周围放了括号。不要依赖缩进来处理代码流，即使你的 if-else 只有一个语句，也要显式地放置括号。

    public static void main(String[] args) {

    String weekDay = "";

    Calendar c = Calendar.getInstance();
    int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);

    if (Calendar.MONDAY == dayOfWeek) {
        weekDay = "monday";
    } else if (Calendar.TUESDAY == dayOfWeek) {
        weekDay = "tuesday";
    } else if (Calendar.WEDNESDAY == dayOfWeek) {
        weekDay = "wednesday";
    } else if (Calendar.THURSDAY == dayOfWeek) {
        weekDay = "thursday";
    } else if (Calendar.FRIDAY == dayOfWeek) {
        weekDay = "friday";
    } else if (Calendar.SATURDAY == dayOfWeek) {
        weekDay = "saturday";
    } else if (Calendar.SUNDAY == dayOfWeek) {
        weekDay = "sunday";
    }

    System.out.println(weekDay);

}

回答by Oscerd

There was no need to use the c.get

没有必要使用 c.get

    Calendar c = Calendar.getInstance();
    int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);                

    if (Calendar.MONDAY == dayOfWeek) weekDay = "monday";
    else if (Calendar.TUESDAY == dayOfWeek) weekDay = "tuesday";
    else if (Calendar.WEDNESDAY == dayOfWeek) weekDay = "wednesday";
    else if (Calendar.THURSDAY == dayOfWeek) weekDay = "thursday";
    else if (Calendar.FRIDAY == dayOfWeek) weekDay = "friday";
    else if (Calendar.SATURDAY == dayOfWeek) weekDay = "saturday";
    else if (Calendar.SUNDAY == dayOfWeek) weekDay = "sunday";

    System.out.println(weekDay);

and output:

和输出：

thursday

You can see your error if you try to print the values with c.getwith this code

如果您尝试c.get使用此代码打印值，您会看到错误

    System.out.println(c.get(Calendar.MONDAY));
    System.out.println(c.get(Calendar.TUESDAY));
    System.out.println(c.get(Calendar.WEDNESDAY));
    System.out.println(c.get(Calendar.THURSDAY));
    System.out.println(c.get(Calendar.FRIDAY));
    System.out.println(c.get(Calendar.SATURDAY));
    System.out.println(c.get(Calendar.SUNDAY));

For example I get:

例如我得到：

7
33
3
15
227
5
2013

And the result will be incorrect, in my case I get Sundayas weekDayif I use your code.

其结果将是不正确的，在我的情况，我得到Sunday的weekDay，如果我用你的代码。

回答by gifpif

try this

尝试这个

import java.text.DateFormatSymbols;
import java.util.Date;
...
String[] weekdays = new DateFormatSymbols().getWeekdays();
String[] month = new DateFormatSymbols().getMonths();
System.outprintln(weekdays[date.getDay()+1]+","+month[date.getMonth()]+" "+date.getDate());

回答by Don Gossett

I accomplished this by doing the following:

我通过执行以下操作来完成此操作：

String weekDay;
SimpleDateFormat dayFormat = new SimpleDateFormat("EEEE", Locale.US);

Calendar calendar = Calendar.getInstance();
weekDay = dayFormat.format(calendar.getTime());

• Use the day format for "EEEE" will return the full weekday name, i.e. Tuesday
• Use the day format for "E" will return the the abbreviated name, i.e. Tue
• Another benefit to returning this format in Android is that it will translate the weekday based on the locale.

• 使用“EEEE”的日期格式将返回完整的工作日名称，即星期二
• 使用“E”的日期格式将返回缩写名称，即 Tue
• 在 Android 中返回此格式的另一个好处是它将根据区域设置转换工作日。

You will want to review the SimpleDateFormatto learn more. I think this is the cleanest approach in that you do not need a switchor ifstatement if your only need is to get the string value.

您将需要查看SimpleDateFormat以了解更多信息。我认为这是最干净的方法，因为如果您只需要获取字符串值，则不需要switch或if语句。

回答by sandalone

As simple as this

就这么简单

sCalendar = Calendar.getInstance();
String dayLongName = sCalendar.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.getDefault());

回答by Muhammed Refaat

just do the following:

只需执行以下操作：

    Date date = new Date();
    CharSequence time = DateFormat.format("EEEE", date.getTime()); // gives like (Wednesday)