Question

所以我试图制作一个假设在特定时间发布的AlarmManager。问题是，当我设置时间时，tt不起作用。我认为主要的问题是，在我更改了Calendar上的时间后，在日志中对象值“时间”显示了吗？

timeOff = Calendar.getInstance();
System.out.println(timeOff);
timeOff.add(Calendar.DAY_OF_WEEK,Calendar.FRIDAY);
timeOff.set(Calendar.HOUR_OF_DAY, 16);
timeOff.set(Calendar.MINUTE, 30);
timeOff.set(Calendar.SECOND, 0);
System.out.println(timeOff);
System.out.println("TIME:: "+timeOff.getTimeInMillis());
Intent intent = new Intent(TabsActivity.this, Receiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(TabsActivity.this, 1122, intent, 0);
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
am.setRepeating(am.RTC_WAKEUP, timeOff.getTimeInMillis(),timeOff.getTimeInMillis()+ 1000,pendingIntent);// + 604800000L,pendingIntent);

日志显示：改变之前：

java.util.GregorianCalendar[time=1406899765159,areFieldsSet=true,lenient=true,zone=Europe/Riga,firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2014,MONTH=7,WEEK_OF_YEAR=31,WEEK_OF_MONTH=1,DAY_OF_MONTH=1,DAY_OF_YEAR=213,DAY_OF_WEEK=6,DAY_OF_WEEK_IN_MONTH=1,AM_PM=1,HOUR=4,HOUR_OF_DAY=16,MINUTE=29,SECOND=25,MILLISECOND=159,ZONE_OFFSET=7200000,DST_OFFSET=3600000]

变更后：

java.util.GregorianCalendar[time=?,areFieldsSet=false,lenient=true,zone=Europe/Riga,firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2014,MONTH=7,WEEK_OF_YEAR=32,WEEK_OF_MONTH=2,DAY_OF_MONTH=7,DAY_OF_YEAR=219,DAY_OF_WEEK=5,DAY_OF_WEEK_IN_MONTH=1,AM_PM=1,HOUR=4,HOUR_OF_DAY=16,MINUTE=30,SECOND=0,MILLISECOND=159,ZONE_OFFSET=7200000,DST_OFFSET=3600000]

如您所见 -

Time=?

所以我的问题是，我做错了什么，为什么在我设定时间之后，它没有表现出来。即使我尝试注销普通timeOff.getTimeInMillis()，它也根本没有显示任何内容。

解决方案

将timeOff.add(Calendar.DAY_OF_WEEK,Calendar.FRIDAY)更改为timeOff.set(Calendar.DAY_OF_WEEK,Calendar.FRIDAY)

Answer 1

因为calendar.add（）方法是抽象的，所以可以像这样使用

        Calendar timeOff = Calendar.getInstance();
        System.out.println(timeOff);
        timeOff.add(Calendar.DAY_OF_WEEK,Calendar.FRIDAY);
        timeOff.getTime()
        //System.out.println(timeOff.getTime());
        timeOff.set(Calendar.HOUR_OF_DAY, 16);
        timeOff.set(Calendar.MINUTE, 30);
        timeOff.set(Calendar.SECOND, 0);
        System.out.println(timeOff);
        System.out.println("TIME:: "+timeOff.getTimeInMillis());

日历设置后。不能得到timeinMillis（）

解决方案

1 个答案: