如果AlarmManager和NotificationManager不工作，可以按照以下步骤来解决问题：

1. 确保在AndroidManifest.xml文件中添加了必要的权限和声明。例如，确保添加了以下权限：

并且添加了以下声明：

2. 确保在代码中正确设置了AlarmManager和NotificationManager。

下面是一个示例代码，演示如何设置AlarmManager和NotificationManager来触发一个定时通知：

// 设置AlarmManager
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, MyNotificationReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 8); // 设置闹钟触发时间为每天早上8点
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);

// 设置重复时间间隔为一天
long interval = AlarmManager.INTERVAL_DAY;
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), interval, pendingIntent);

// 设置NotificationManager
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("提醒")
        .setContentText("该做某事了！")
        .setPriority(NotificationCompat.PRIORITY_DEFAULT);

// 发送通知
notificationManager.notify(1, builder.build());

3. 确保MyNotificationReceiver类正确实现了BroadcastReceiver，并且在接收到广播时触发通知。

public class MyNotificationReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 在收到广播时触发通知
        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                .setSmallIcon(R.drawable.notification_icon)
                .setContentTitle("提醒")
                .setContentText("该做某事了！")
                .setPriority(NotificationCompat.PRIORITY_DEFAULT);

        notificationManager.notify(1, builder.build());
    }
}

这些步骤可以帮助解决AlarmManager和NotificationManager不工作的问题。如果问题仍然存在，可能是由于其他代码逻辑或设备设置导致的，需要进一步调试和排查。