解决Notification不显示问题支持Android 8.0

在使用anddroid 通知时候出现，明明代码没错，但是通知就是没有出现，更换手机后出现了，排查后，发现是因为android 版本的问题，现在适配android 8.0的版本代码如何。

tring id = "my_channel_01";String name="我是渠道名字";notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);Notification notification = null;if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {    NotificationChannel mChannel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_LOW);    Toast.makeText(this, mChannel.toString(), Toast.LENGTH_SHORT).show();    Log.i(TAG, mChannel.toString());    notificationManager.createNotificationChannel(mChannel);    notification = new Notification.Builder(this)            .setChannelId(id)            .setContentTitle("5 new messages")            .setContentText("hahaha")            .setSmallIcon(R.mipmap.ic_launcher).build();} else {    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)            .setContentTitle("5 new messages")            .setContentText("hahaha")            .setSmallIcon(R.mipmap.ic_launcher)            .setOngoing(true)            .setChannel(id);//无效    notification = notificationBuilder.build();}notificationManager.notify(111123, notification);

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