Error prompt:

android.app.RemoteServiceException: Bad notification for startForeground: java.lang.RuntimeException: invalid channel for service notification: Notification(channel=null

After 8.0, you need to add channel to distinguish notifications, so it needs to be written as follows:

/**
     * Set the service to be visible in the foreground
     */
    private void startForeground(){
        /**
         * Notification bar click to jump the intent
         */
        PendingIntent pendingIntent = PendingIntent.getActivity(this,0, new Intent(this, WelcomeActivity.class), PendingIntent.FLAG_CANCEL_CURRENT);

        /**
         * Create Notification
         */
        NotificationChannel notificationChannel;
        Notification notification;
        if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.O){
            notificationChannel= new NotificationChannel(CHANNEL_ID,
                    CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
            notificationChannel.enableLights(true);
            notificationChannel.setLightColor(Color.RED);
            notificationChannel.setShowBadge(true);
            notificationChannel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
            NotificationManager manager= (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            manager.createNotificationChannel(notificationChannel);

            notification = new NotificationCompat.Builder(this, CHANNEL_ID)
                    .setContentTitle(mMusicModel.getName())
                    .setContentText(mMusicModel.getAuthor())
                    .setSmallIcon(R.mipmap.logo)
                    .setContentIntent(pendingIntent)
                    .build();
        }else{
            notification = new Notification.Builder(this)
                    .setContentTitle(mMusicModel.getName())
                    .setContentText(mMusicModel.getAuthor())
                    .setSmallIcon(R.mipmap.logo)
                    .setContentIntent(pendingIntent)
                    .build();
        }

        /**
         * Set notification to be displayed in the foreground
         */
        startForeground(NOTIFICATION_ID, notification);
    }