我想使用Flutter小部件在Android上显示自定义通知？我想知道这是否可行。

我所做的：

我尝试使用显示Flutter widget in an Android Fragment和显示片段使用RemoteViews for custom Android notifications。
会显示一个通知，但它不包括Flutter小部件。参见下面的屏幕截图：

代码：

var newFlutterFragment: FlutterFragment = FlutterFragment.withCachedEngine("my_engine_id")
     .shouldAttachEngineToActivity(false)
     .build()
 if (fragmentManager != null) {
     fragmentManager
         .beginTransaction()
         .add(
             R.id.fragment_container,
             newFlutterFragment,
             TAG_FLUTTER_FRAGMENT
         )
         .commit()
 }


 val notificationLayout = RemoteViews(packageName, R.layout.activity_layout)
 val notificationLayoutExpanded = RemoteViews(packageName, R.layout.activity_layout)

 var builder = NotificationCompat.Builder(this, CHANNEL_ID)
     .setSmallIcon(R.drawable.ic_bg_service_small)
     .setCustomContentView(notificationLayout)
     .setCustomBigContentView(notificationLayoutExpanded)
     .setPriority(NotificationCompat.PRIORITY_DEFAULT)

 var notificationId = 1;

 with(NotificationManagerCompat.from(this)) {
     // notificationId is a unique int for each notification that you must define
     notify(notificationId, builder.build())
 }