获取毫秒至午夜 [英] Get milliseconds until midnight

问题描述

我创造，我想在午夜更新，每天晚上一个Android窗口小部件。我使用的是 AlarmManager ，我需要找出多少毫秒从当前时间至午夜留。这是我的code：

I'm creating an Android widget that I want to update every night at midnight. I am using an AlarmManager and I need to find out how many milliseconds are left from the current time until midnight. Here's my code:

AlarmManager mAlarmManager = (AlarmManager)context.getSystemService(android.content.Context.ALARM_SERVICE);
mAlarmManager.set(AlarmManager.ELAPSED_REALTIME, millisecondsUntilMidnight, mSrvcPendingingIntent);

我如何计算有多少毫秒留至午夜？

How can I calculate how many milliseconds are left until midnight?

感谢你在前进。

推荐答案

使用日历来计算的：

        Calendar c = Calendar.getInstance();
        c.add(Calendar.DAY_OF_MONTH, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        long howMany = (c.getTimeInMillis()-System.currentTimeMillis());

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