如何防止每次创建新通知时覆盖通知？

Question

我正在尝试在数据库上注册一个项目（6小时或12小时）后的特定时间发送通知。当我只注册一个项目时，通知工作良好，但是，如果我在一段时间内注册了两个项目，第一个通知将被第二个覆盖。

我知道我必须将id添加到挂起的意图中，可能还需要将id添加到实际通知中，但是我对alarmManager类不是很熟悉，也不知道应该在哪里添加id。如何使这两个通知相互独立？

NotificationHelper类：

public static class NotificationHelper extends ContextWrapper {

        public static final String channel1ID = "channel1ID";
        public static final String channel1Name = "USER1";

        private NotificationManager mManager;


        public NotificationHelper(Context base) {
            super(base);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                createChannels();
            }
        }

        @RequiresApi(api = Build.VERSION_CODES.O)
        private void createChannels() {

            NotificationChannel channel1 = new NotificationChannel(channel1ID, channel1Name, NotificationManager.IMPORTANCE_HIGH);
            channel1.enableLights(true);
            channel1.enableVibration(true);
            channel1.shouldVibrate();
            channel1.setShowBadge(true);
            channel1.setLightColor(R.color.colorPrimary);
            channel1.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
            Uri uri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            AudioAttributes audioAttributes = new AudioAttributes.Builder()
                    .setContentType(AudioAttributes.CONTENT_TYPE_UNKNOWN)
                    .setUsage(USAGE_NOTIFICATION)
                    .build();
            channel1.setSound(uri, audioAttributes);

            getManager().createNotificationChannel(channel1);


        }

        public NotificationManager getManager() {
            if (mManager == null) {
                mManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            }
            return mManager;
        }


        public NotificationCompat.Builder getChannel1Notification() {
            return new NotificationCompat.Builder(getApplicationContext(), channel1ID)
                    .setContentTitle("Dressing")
                    .setContentText("Please scan the dressing on your: " + (et_DressingPos.getText().toString().trim()))
                    .setSmallIcon(R.drawable.ic_cnoticiation_scan);


        }


    }

 @Override
    public void onReceive(Context context, Intent intent) {
        Camera2Register.NotificationHelper notificationHelper = new Camera2Register.NotificationHelper(context);
        NotificationCompat.Builder nb = notificationHelper.getChannel1Notification();
        Intent intent2 = new Intent(context, Camera2.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 1, intent2, 0);
        nb.setContentIntent(pendingIntent);
        notificationHelper.getManager().notify(1, nb.build());
    }
}

private void startAlarmScan() {
        int requestCode = ("someString" + System.currentTimeMillis()).hashCode();

        Long time = System.currentTimeMillis();

        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this, AlarmReceiver.class);
        intent.putExtra("randomRequestCode", requestCode);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, requestCode, intent, 0);

        long milliseconds = 5000;
        alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, (time + milliseconds), pendingIntent);

        //}
    }

    private void startAlarmChange() {
        int requestCode = ("someString" + System.currentTimeMillis()).hashCode();

        Long time = System.currentTimeMillis();
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this, AlarmReceiver.class);
        intent.putExtra("randomRequestCode", requestCode);

        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, requestCode, intent, 0);

        long milliseconds = 30000;

            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, (time + milliseconds), pendingIntent2);
        //}
    }

我开始认为问题可能出在我的通知系统的结构上，是否需要一个Receiver类？在Android上的通知文档中没有提到它。

Answer 1

您在此处使用常量值“1”作为通知id:notificationhelper.getmanager().notify(1,nb.build())；

从文档：这里“如果您的应用程序已经发布了具有相同id的通知，但尚未取消，它将被更新的信息替换”

将此1更改为每个通知的唯一数字，您将看到它们全部通过。

PendingIntent pendingIntent = PendingIntent.getActivity(context, 1, intent2, 0);