问AlarmManger setRepeating停止运行

EN

public class MyReceiver extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

        Notification notification = new NotificationCompat.Builder(context, "notify_001")
                .setContentTitle("URL Database")
                .setSmallIcon(R.drawable.ic_launcher)
                .setStyle(new NotificationCompat.BigTextStyle())
                .setContentText("You didn't use the URLDatabase app for a while.\nYour urls feel lonely.")
                .setContentIntent(pendingIntent).build();

        NotificationManager manager = (NotificationManager) context.getSystemService(Service.NOTIFICATION_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
        {
            NotificationChannel channel = new NotificationChannel("notify_001",
                    "URLDatabaseNotification",
                    NotificationManager.IMPORTANCE_DEFAULT);
            manager.createNotificationChannel(channel);
        }

        manager.notify(0, notification);
        Log.i("URLDatabase", "Received");
    }
}

calendar = Calendar.getInstance();
intent = new Intent(this, MyReceiver.class);
pendingIntent = PendingIntent.getBroadcast(this, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
am = (AlarmManager) this.getSystemService(ALARM_SERVICE);

am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000*60*60, pendingIntent);