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);
    }

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;)

    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");

            }

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。

如果你的目标是Android 12(即目标SDK 31)，那么，对于AlarmManager, PendingIntent不能在没有Mutable或Immutable标志的情况下创建。如果没有这个可变性标志，应用程序将抛出一个运行时错误。有关这方面的更多详细信息，请参阅本文档。下面的代码片段对我来说是有用的，它将帮助那些将应用程序定位于Android 12的人。

创建告警:

public static void setupReminderServiceAlarm ( Context context ) {
    Log.d ( TAG, "Trying to setup reminder service alarm" );
    if (!isReminderServiceAlarmSet ( context )) {
        AlarmManager alarmManager = (AlarmManager) context.getApplicationContext ().getSystemService ( Context.ALARM_SERVICE );
        Intent intent = new Intent ( context.getApplicationContext (), ReminderIntentReceiver.class );
        intent.setAction ( REMINDER_INTENT_ACTION );
        PendingIntent pendingIntent;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
            pendingIntent = PendingIntent.getBroadcast ( context.getApplicationContext (), REMINDER_INTENT_REQUEST_CODE, intent, PendingIntent.FLAG_IMMUTABLE );
        } else {
            pendingIntent = PendingIntent.getBroadcast ( context.getApplicationContext (), REMINDER_INTENT_REQUEST_CODE, intent, 0 );
        }
        alarmManager.setRepeating ( AlarmManager.RTC_WAKEUP, getReminderTriggerTime (), REMINDER_INTERVAL, pendingIntent );
        Log.d ( TAG, "Reminder service alarm setup completed" );
    }
}

查询告警是否已设置:

private static boolean isReminderServiceAlarmSet ( Context context ) {
    Intent intent = new Intent ( context.getApplicationContext (), ReminderIntentReceiver.class );
    intent.setAction ( REMINDER_INTENT_ACTION );
    boolean isBackupServiceAlarmSet;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
        PendingIntent.getBroadcast ( context.getApplicationContext (), REMINDER_INTENT_REQUEST_CODE, intent, PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_NO_CREATE );
        isBackupServiceAlarmSet = (PendingIntent.getBroadcast ( context.getApplicationContext (), REMINDER_INTENT_REQUEST_CODE, intent, PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_NO_CREATE ) != null);
    } else {
        PendingIntent.getBroadcast ( context.getApplicationContext (), REMINDER_INTENT_REQUEST_CODE, intent, PendingIntent.FLAG_NO_CREATE );
        isBackupServiceAlarmSet = (PendingIntent.getBroadcast ( context.getApplicationContext (), REMINDER_INTENT_REQUEST_CODE, intent, PendingIntent.FLAG_NO_CREATE ) != null);
    }
    Log.d ( TAG, "Reminder service alarm is " + (isBackupServiceAlarmSet ? "" : "not ") + "set already" );
    return isBackupServiceAlarmSet;
}

取消之前设置的闹钟:

public static void cancelReminderServiceAlarm ( Context context ) {
    Log.d ( TAG, "Reminder service alarm canceled" );
    AlarmManager alarmManager = (AlarmManager) context.getApplicationContext ().getSystemService ( Context.ALARM_SERVICE );
    Intent intent = new Intent ( context.getApplicationContext (), ReminderIntentReceiver.class );
    intent.setAction ( REMINDER_INTENT_ACTION );
    PendingIntent pendingIntent;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
        pendingIntent = PendingIntent.getBroadcast ( context.getApplicationContext (), REMINDER_INTENT_REQUEST_CODE, intent, PendingIntent.FLAG_IMMUTABLE );
    } else {
        pendingIntent = PendingIntent.getBroadcast ( context.getApplicationContext (), REMINDER_INTENT_REQUEST_CODE, intent, 0 );
    }
    alarmManager.cancel ( pendingIntent );
    pendingIntent.cancel ();
}

希望这个答案能帮助那些瞄准Android 12 / SDK 31+应用程序的人。此外，请确保在清单中添加此权限，以调度针对上述告警的告警。

<uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM"/>

我用android jetpack workManager做了一个变通。

与其直接在alarmManager中设置警报，不如在workManager中设置work，在那里您可以设置触发时间(在workManager中设置触发时间)，并为该work添加一个标签。当工作触发时，可设置并触发报警。

为了回答您的问题，您只需通过.addTag("something")向作品添加标签，然后在检查活动作品时使用.getWorkInfosByTag("something")