FlutterUnityPlugin.cs

using System.Runtime.InteropServices;
using UnityEngine;

namespace FlutterUnityPlugin
{
 public class Message
 {
 public int id;
 public string data;

 public static Message FromJson(string json)
 {
 return JsonUtility.FromJson<Message>(json);
 }

 public string ToJson()
 {
 return JsonUtility.ToJson(this);
 }
 }

 public static class Messages
 {
 public static void Send(Message message)
 {
 string data = message.ToJson();

 if (Application.platform == RuntimePlatform.Android)
 {
 using (AndroidJavaClass FlutterUnityPluginClass = new AndroidJavaClass("com.glartek.flutter_unity.FlutterUnityPlugin"))
 {
 FlutterUnityPluginClass.CallStatic("onMessage", data);
 }
 }
 else
 {
 #if UNITY_IOS
 FlutterUnityPluginOnMessage(data);
 #endif
 }
 }

 public static Message Receive(string data)
 {
 return Message.FromJson(data);
 }

 #if UNITY_IOS
 [DllImport("__Internal")]
 private static extern void FlutterUnityPluginOnMessage(string data);
 #endif
 }
}