Hosting multiple NativeViews in a Flutter app

Question

I'm doing the good old native view hosting (codes at the end, which is basically copied from Flutter website) for a video chat app. I want to show video feed of each user in one of these.

For that I tried to pass different creationParams, but it seems only one View can exist at a time; no new "view creation" occur after the first one.

Do I have to register each view in advance, passing different viewType for each? Or is there a better way for having unknown number of NativeViews?

Flutter

const String viewType = '<platform-view-type>';
final Map<String, dynamic> creationParams = <String, dynamic>{};

switch (defaultTargetPlatform) {
  case TargetPlatform.android:
    return AndroidView(
      viewType: viewType,
      layoutDirection: TextDirection.ltr,
      creationParams: creationParams,
      creationParamsCodec: const StandardMessageCodec(),
    );
  case TargetPlatform.iOS:
    return UiKitView(
      viewType: viewType,
      layoutDirection: TextDirection.ltr,
      creationParams: creationParams,
      creationParamsCodec: const StandardMessageCodec(),
    );
  default:
    throw UnsupportedError('Unsupported platform view');

iOS

registrar.register(nativeViewFactory, withId: "<platform-view-type>")

Android

flutterPluginBinding.platformViewRegistry.registerViewFactory("<platform-view-type>", nativeViewFactory)

Edit: This is how I tried to create different views by passing different params:

ViewFactory (android)

class NativeViewFactory : PlatformViewFactory(StandardMessageCodec.INSTANCE) {
    private lateinit var selfVideoView: NativeView
    private val remoteVideoViews: MutableMap<String, NativeView> = HashMap()

    fun getSelfVideo(): NativeView {
        return selfVideoView
    }

    override fun create(context: Context?, viewId: Int, args: Any?): PlatformView {
        val creationParams = args as Map<String?, Any?>?
        return if (context != null) {
            val videoView = NativeView(context, viewId, creationParams)
            if (creationParams == null || creationParams.isEmpty()) {
                selfVideoView = videoView
            } else {
                val username = creationParams["username"] as String
                remoteVideoViews[username] = videoView

                /// ...
                /// Connect video feed of 'username' to videoView
                /// ...
            }
            videoView
        } else {
            throw IllegalStateException("Context is null")
        }
    }
}