Push notification 推送通知在API的后台不起作用<=25

我试图显示一个通知类型，它可以正常工作，但我只在API上得到通知

@Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
       

        PendingIntent pendingIntent = PendingIntent.getActivity(
                this, 0, new Intent(this, MainActivity.class), PendingIntent.FLAG_ONE_SHOT);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, getString(R.string.notification_channel_id))
                .setSmallIcon(R.drawable.ic_stat_notify)
                .setContentTitle(getString(R.string.app_name))
                .setContentText(remoteMessage.getNotification().getBody())
                .setAutoCancel(true)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_stat_notify))
                .setSound(Settings.System.DEFAULT_NOTIFICATION_URI)
                .setDefaults(NotificationCompat.DEFAULT_VIBRATE)
                .setDefaults((NotificationCompat.PRIORITY_MAX))
                .setContentIntent(pendingIntent);;
        ((NotificationManager) getSystemService(NOTIFICATION_SERVICE)).notify(remoteMessage.hashCode(), builder.build());
    }