使用RemoteViews自定义通知栏布局，发送通知不显示的问题

由于我用的AS版本比较高，创建布局文件时默认使用ConstraintLayout布局作为根布局，再用RemoteViews加载自定义布局就会出现发送通知不显示的情况。
解决办法就是将根布局换成RelativeLayout或者LinearLayout这两个常用的都行，反正通知栏也不会用到太复杂的布局。
下面贴上创建通知栏以及RemoteViews使用的代码：

            val intent = Intent(this@TestCustomViewActivity,MainActivity::class.java)
            val pendingIntent = PendingIntent.getActivity(this@TestCustomViewActivity,0,intent,PendingIntent.FLAG_UPDATE_CURRENT)
            val channelId = "channelId"
            val channelName = "channelName"
            val channel = NotificationChannel(channelId,channelName,NotificationManager.IMPORTANCE_LOW)

            val remoteViews = RemoteViews(packageName,R.layout.test_notification_custom_layout)
            remoteViews.setTextViewText(R.id.content_tv,"自定义通知栏文字内容")
            remoteViews.setImageViewResource(R.id.notification_iv,R.drawable.abc_vector_test)
            remoteViews.setOnClickPendingIntent(R.id.custom_btn,pendingIntent)


            val notification = NotificationCompat.Builder(this,channelId)
//                .setContentTitle("hello world")
//                .setContentText("我是一个notification")
                .setWhen(System.currentTimeMillis())
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setAutoCancel(true)
                .setDefaults(Notification.DEFAULT_LIGHTS)
                .setContentIntent(pendingIntent)
                .setCustomContentView(remoteViews)
                .build()

            val manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            manager.createNotificationChannel(channel)
            manager.notify(1,notification)