using Android.Content;
using Android.OS;
using Com.Huawei.Agconnect.Config;
using Com.OneSignal.Sample.Shared;
using System;

namespace Com.OneSignal.Sample.Droid
{
    [Activity(Label = "Com.OneSignal.Sample.Droid", MainLauncher = true, Icon = "@mipmap/icon")]
    public class MainActivity : Activity
    {
    
        protected override void AttachBaseContext(Context context)
        {
            base.AttachBaseContext(context);
         
            // Read the agconnect-services.json so that the config is set for Huawei to register for a pushToken
            AGConnectServicesConfig config = AGConnectServicesConfig.FromContext(context);
            // Refer to Huawei docs or below on how to create your HmsLazyInputStream class
            config.OverlayWith(new HmsLazyInputStream(context));
        }

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.Main);

            // Init OneSignal through a Shared class, easier to init for both Android and iOS applications
            SharedPush.Initialize();
        }
    }
}

using Android.Content;
using Com.Huawei.Agconnect.Config;
using System;
using System.IO;

namespace Com.OneSignal.Sample.Droid
{
    public class HmsLazyInputStream : LazyInputStream
    {
        public HmsLazyInputStream(Context context) : base(context)
        {
        }

        public override Stream Get(Context context)
        {
            try
            {
               // Trying to read agconnect-services.json file
               return context.Assets.Open("agconnect-services.json");
            }
            catch (Exception e)
            {
               // Failed to read agconnect-services.json file
               return null;
            }
        }
    }
}