如何在特定时间开始活动? [英] How to start an activity on a certain time?

问题描述

此问题可能与此有关和这个问题，但与我想要的那些问题不同在特定时间启动它们(例如，2014年3月15日11:12:13).

This question might be related to this and this question, but unlike those question I want to start them on a specific time, (say 11:12:13 on 15/03/2014).

我实际上正在研究一个在给定时间发送消息的项目(SMS).

I am actually working on a project (SMS) that sends messages on a given time.

推荐答案

尝试以下代码，我对其进行了测试:

try this code, I tested it:

Calendar calendar = Calendar.getInstance();

• 并通过以下一种方式设置时间:

  • And set time by one of this ways:

    calendar.set(year, month, day, hourOfDay, minute);
    // be careful month start form "0" so for "May" put "4"
    

  • 或:

  • or:

    calendar.set(Calendar.HOUR_OF_DAY, hour);
    calendar.set(Calendar.MINUTE, minute);
    

  Intent intent = new Intent(MainActivity.this, NextActivity.class);
  PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
  ((AlarmManager) getSystemService(ALARM_SERVICE)).set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
  

  注意:如果需要计时器，可以在上面的代码中将alendar.getTimeInMillis()替换为System.currentTimeMillis() + x. (x是您要等待的毫秒数int)

  Note: If you need a timer, you can replace alendar.getTimeInMillis() to System.currentTimeMillis() + x in above code. (x is an int of milliseconds that you want make wait)

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