Android：AlarmManager每天午夜一次重述任务 [英] Android: AlarmManager recuring tasks once a day at midnight

问题描述

我试图在每天结束时（23.59）重复执行一项任务，所以我想使用alarmmanager.setRepeating（）。
在我的测试中，我想出了一些代码，我以为每秒可以重复执行一个任务，它可以正常工作，但不是每秒钟重复一次，而是每分钟重复一次任务，我不确定为什么，因此我不知道确保我将使它每天都能工作。这是我的代码：

I am trying to make a task repeat at the end of each day (23.59) to do so I would like to use alarmmanager.setRepeating(). In my test i have come up with a bit of code that i thought would repeat a task every second, it works but instead of being everyseconds it repeats the tasks every minute, I am not sure why and therefore I am not sure that I will be able to make it work for every day. Here is my code:

public class RecurringTasks extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        // add calculation logic here
        Toast.makeText(context, "happening !!!!!!!!!!", Toast.LENGTH_LONG).show(); // For example
    }

    public void setRecurringTasks(Context context)
    {
        AlarmManager am =( AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent i = new Intent(context, RecurringTasks.class);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
        am.setRepeating(AlarmManager.RTC, System.currentTimeMillis(), 1000, pi);
    }

    public void cancelRecurringTasks(Context context)
    {
        Intent intent = new Intent(context, RecurringTasks.class);
        PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.cancel(sender);
    }
}

这是导致问题的行，我认为：

This is the line that is causing problem i think:

am.setRepeating(AlarmManager.RTC, System.currentTimeMillis(), 1000, pi);

我以为1000毫秒？因此应该是1s？

I thought the 1000 was in miliseconds ? it should therefore be 1s ?

这是我在日志中看到的消息：

Here is the message I get in my logs:

D/DEBUG: im repeating
E/EGL_emulation: tid 3322: eglSurfaceAttrib(1165): error 0x3009 (EGL_BAD_MATCH)
W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0x9773e540, error=EGL_BAD_MATCH
E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb2c768a0

解决方案

Android不允许您在不到一分钟的时间内重复执行任务，这就是为什么我只在每分钟重复一次。为了使它每天在23.59.59重复，我使用了以下代码：

Android will not allow you to repeat a task in less then one minute this is why mine was only repeating every minute. To manage to make it repeat every day at 23.59.59 I used the following code:

 Calendar calendar = Calendar.getInstance();

        calendar.set(Calendar.HOUR_OF_DAY, 23); // For 1 PM or 2 PM
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);

        AlarmManager am =( AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent i = new Intent(context, RecurringTasks.class);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
        am.setRepeating(AlarmManager.RTC, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pi);

推荐答案

我以为1000是几毫秒？因此应该是1s？

I thought the 1000 was in miliseconds ? it should therefore be 1s ?

是。但是，在Android 5.1及更高版本上，您无法安排经常重复执行任务。如果您尝试这样做，则将舍入到一分钟。

It is. However, on Android 5.1 and higher, you cannot schedule a repeating task that frequently. If you try, it will be rounded up to a minute.

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