对于其他可能需要这个的人，这里有一个答案。

使用adb shell dumpsys警报

你可以知道闹铃已经设置好了，什么时候闹铃和间隔时间。还有这个警报被触发的次数。

我的印象是没有办法做到这一点，尽管这将是很好的。

你可以通过在某个地方记录Alarm_last_set_time来实现类似的结果，并有一个On_boot_starter BroadcastReciever:BOOT_COMPLETED之类的东西。

    Intent intent = new Intent("com.my.package.MY_UNIQUE_ACTION");
            PendingIntent pendingIntent = PendingIntent.getBroadcast(
                    sqlitewraper.context, 0, intent,
                    PendingIntent.FLAG_NO_CREATE);

FLAG_NO_CREATE不是创建挂起意图，因此它给出布尔值false。

            boolean alarmUp = (PendingIntent.getBroadcast(sqlitewraper.context, 0,
                    new Intent("com.my.package.MY_UNIQUE_ACTION"),
                    PendingIntent.FLAG_NO_CREATE) != null);

            if (alarmUp) {
                System.out.print("k");

            }

            AlarmManager alarmManager = (AlarmManager) sqlitewraper.context
                    .getSystemService(Context.ALARM_SERVICE);
            alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
                    System.currentTimeMillis(), 1000 * 60, pendingIntent);

在AlarmManager检查Pending Intent的值后，它给出true，因为AlarmManager更新了Pending Intent的标志。

            boolean alarmUp1 = (PendingIntent.getBroadcast(sqlitewraper.context, 0,
                    new Intent("com.my.package.MY_UNIQUE_ACTION"),
                    PendingIntent.FLAG_UPDATE_CURRENT) != null);
            if (alarmUp1) {
                System.out.print("k");

            }

我做了一个简单(愚蠢与否)的bash脚本，从adb shell中提取long，将它们转换为时间戳并以红色显示。

echo "Please set a search filter"
read search

adb shell dumpsys alarm | grep $search | (while read i; do echo $i; _DT=$(echo $i | grep -Eo 'when\s+([0-9]{10})' | tr -d '[[:alpha:][:space:]]'); if [ $_DT ]; then echo -e "\e[31m$(date -d @$_DT)\e[0m"; fi; done;)

试试吧;)

刚找到另一个解决办法，似乎对我有用

Intent myIntent = new Intent(MainActivity.this, MyReceiver.class);

boolean isWorking = (PendingIntent.getBroadcast(MainActivity.this, 0, myIntent, PendingIntent.FLAG_NO_CREATE) != null);
if (isWorking) {Log.d("alarm", "is working");} else {Log.d("alarm", "is not working");}

if(!isWorking) {
    pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent,    PendingIntent.FLAG_UPDATE_CURRENT);
    alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    int timeNotif = 5 * 60 * 1000;//time in ms, 7*24*60*60*1000 for 1 week
    Log.d("Notif", "Notification every (ms): " + timeNotif);
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), timeNotif, pendingIntent);
    }

根据ron发表的评论，下面是详细的解决方案。让我们假设你已经注册了一个重复的警报，它的意图是这样的:

Intent intent = new Intent("com.my.package.MY_UNIQUE_ACTION");
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, 
                                      intent, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.MINUTE, 1);

AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60, pendingIntent);

检查它是否处于活动状态的方法是:

boolean alarmUp = (PendingIntent.getBroadcast(context, 0, 
        new Intent("com.my.package.MY_UNIQUE_ACTION"), 
        PendingIntent.FLAG_NO_CREATE) != null);

if (alarmUp)
{
    Log.d("myTag", "Alarm is already active");
}

关键是在javadoc中描述的FLAG_NO_CREATE:如果所描述的PendingIntent **不**已经存在，那么简单地返回null(而不是创建一个新的)