android - 如何在不通知的情况下在 Android 中更新通知？

Question

所以我有一个通过 MQTT 接收温度的应用程序。为了避免被通知发送垃圾邮件，我希望应用程序通知一次，即振动，播放声音，然后接下来的 3 次(如果通知没有被关闭)它只会更新温度值。所以:

通知

更新温度

更新温度

更新温度
5(或1，如果你愿意)通知

这是我的代码:

 private final NotificationCompat.Builder builder = new NotificationCompat.Builder(this, id);

 private void handleNotification(String message, String topic) {
        if (notifManager == null) {
            notifManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        }

        if (isNotifRunning() && ticker < 3) {
            updateNotif(message);
            ticker++;
        } else {
            createNotif(message);
            ticker = 0;
        }
    }

    private void createNotif(String message) {

        Intent intent;
        PendingIntent pendingIntent;


        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            int importance = NotificationManager.IMPORTANCE_HIGH;
            NotificationChannel mChannel = notifManager.getNotificationChannel(id);
            if (mChannel == null) {
                mChannel = new NotificationChannel(id, name, importance);
                mChannel.setDescription(description);
                mChannel.enableVibration(true);
                mChannel.setVibrationPattern(new long[]{100, 200});
                notifManager.createNotificationChannel(mChannel);
            }
            intent = new Intent(this, MainActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
            pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

            builder.setContentTitle(getString(R.string.notifTmpLowTitle))
                    .setSmallIcon(R.drawable.ic_ac_unit_black_24px)
                    .setContentText(getString(R.string.notifTmpLowText) + " " + message + Constants.CELSIUS)
                    .setDefaults(Notification.DEFAULT_ALL)
                    .setAutoCancel(true)
                    .setContentIntent(pendingIntent)
                    .setTicker(message)
                    .setColor(getResources().getColor(R.color.colorCold))
                    .setVibrate(new long[]{100, 200});

        } else {

            intent = new Intent(this, MainActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
            pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

            builder.setContentTitle(getString(R.string.notifTmpLowTitle))
                    .setSmallIcon(R.drawable.ic_ac_unit_black_24px)
                    .setContentText(getString(R.string.notifTmpLowText) + " " + message + Constants.CELSIUS)
                    .setDefaults(Notification.DEFAULT_ALL)
                    .setAutoCancel(true)
                    .setContentIntent(pendingIntent)
                    .setTicker(message)
                    .setVibrate(new long[]{100, 200})
                    .setColor(getResources().getColor(R.color.colorCold))
                    .setPriority(Notification.PRIORITY_HIGH);
        }
        Notification notification = builder.build();
        notifManager.notify(NOTIFY_ID, notification);
    }

    //TODO Doesn't update, posts a new notification.
    private void updateNotif(String message) {
        builder.setContentText(getString(R.string.notifTmpLowText) + " " + message + Constants.CELSIUS);
        Notification notification = builder.build();
        notification.flags = Notification.FLAG_ONGOING_EVENT;
        notifManager.notify(NOTIFY_ID, notification);
    }
    //---------------------------------------------

有了这段代码，我总能得到一个带有声音和振动的全新通知。我已经查看了有关此问题的先前问题，他们都说使用相同的构建器很重要，正如您所看到的，我已经这样做了。较新的 Android 版本是否有一些我不知道的变化？我已经在 7.1.1 和 8.1 上进行了测试。

Answer 1

您需要调用 setOnlyAlertOnce(true)导致通知更新不发送声音/振动。