Android设置alarmManager每天触发 [英] Android set alarmManager to trigger daily

问题描述

在我的应用中，我需要在每天下午 2:00 启动一项服务.现在我写了一次触发警报的代码，每次打开应用程序都会运行这段代码:

In my app, I need to start a service at 2:00pm daily. Right now I wrote the code to trigger the alarm once, this code is ran every time I open the app:

    AlarmManager alarmMgr = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

    Intent intent = new Intent(this, DownloadReceiver.class);
    PendingIntent pIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    alarmMgr.cancel(pIntent);

    Calendar cal= Calendar.getInstance();
    cal.setTimeInMillis(System.currentTimeMillis());
    cal.set(Calendar.HOUR_OF_DAY,refreshhour);
    cal.set(Calendar.MINUTE,refreshmin);
    cal.set(Calendar.SECOND, 0);
    // if the scheduler date is passed, move scheduler time to tomorrow
    if (System.currentTimeMillis() > cal.getTimeInMillis()) {        
        cal.add(Calendar.DAY_OF_YEAR, 1);
       }


    if(android.os.Build.VERSION.SDK_INT>=23) {
        alarmMgr.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,
        cal.getTimeInMillis(), pIntent);    
        }
    else{
         alarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
                        AlarmManager.INTERVAL_DAY, pIntent);
        }

Q1. 我使用 setAndAllowWhileIdle() 来处理 23 以上的 sdk，以防设备在 打盹 模式.我在此功能中找不到任何可以将闹钟设置为每天重复的选项.

Q1. I used setAndAllowWhileIdle() for sdk above 23 in case the device is in Doze mode. I cannot find any option in this function that I can set the alarm to repeat every day.

Q2. 我也有关于 setInexactRepeating() 的问题，通常通过设置参数 INTERVAL_DAY 将它设置为每天重复，但是在 文档，上面写着

Q2. I also have questions about setInexactRepeating() , normally it is set to repeat every day by setting the parameter INTERVAL_DAY , but in the docs, it says

从 API 19 开始，所有重复的警报都将不准确并受制于与其他警报一起批处理，而不管它们规定的重复间隔如何.

As of API 19, all repeating alarms will be inexact and subject to batching with other alarms regardless of their stated repeat interval.

这是否意味着 INTERVAL_DAY 不再起作用，那么如何在不重新运行此功能并重置 alarmManager 的情况下每天设置闹钟?

Does this mean INTERVAL_DAY does not work anymore, so how can I set the alarm daily without rerunning this function and reset alarmManager?

推荐答案

试试下面的代码就能解决你的问题-

Try below code will solve your problem-

AlarmManager alarmMgr = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

boolean flag = (PendingIntent.getBroadcast(this, 0,
                            new Intent("totime.action.string"),
                            PendingIntent.FLAG_NO_CREATE) != null);

if(!flag)
{
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 14);
    calendar.set(Calendar.MINUTE, 0);
    calendar.set(Calendar.SECOND, 0);
    Intent intent = new Intent("totime.action.string");
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager alarmManager = (AlarmManager) Data_Graph.this.getSystemService(Context.ALARM_SERVICE);
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),(24*60*60*1000), pendingIntent);

  }

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