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我正在开发一个应用程序，并希望通过添加正在进行的通知为用户提供功能的快捷方式。这有点像一些字典应用程序这样做，他们提供快捷方式作为快速搜索的通知。
问题是，即使我有setOngoing（true）和setAutoCancel（false），它仍然会被删除，一旦应用程序从多任务窗格关闭。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            CharSequence name = "C1";
            String description = "C1 is C1";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
            channel.setDescription(description);
            // Register the channel with the system; you can't change the importance
            // or other notification behaviors after this
            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }


NotificationCompat.Builder builder = new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle("XXXX")
                .setContentText("XXXXXXXX")
                .setPriority(NotificationCompat.PRIORITY_MAX)
                .setContentIntent(pendingIntent)
                .setOngoing(true) 
                .setAutoCancel(false);
        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(MainActivity.this);

        // notificationId is a unique int for each notification that you must define
        notificationManager.notify(NOTIFICATION_ID_2, builder.build());