update

Assets/HuaweiService/cloud_db/DBListener.cs

+using UnityEngine;
-using HuaweiServiceDemo;
-using UnityEngine;
 
 namespace HuaweiService.CloudDB {
     public class DBListener_Data : IHmsBaseClass {
         public DBListener (OnSnapshotListener arg0) : base (arg0) { }
-    }
-
-    public class DBListener<T> : DBListener where T : IDatabaseModel, new () {
-        public DBListener (DBSnapshotListener<T> arg0) : base (arg0) { }
     }
 }

Assets/HuaweiService/cloud_db/OnSnapshotListener.cs

 using System.Collections.Generic;
-using HuaweiServiceDemo;
 using UnityEngine;
 
 namespace HuaweiService.CloudDB {