Java.IO.ISerializable Xamarin

Question

I'm trying to pass object in Android using Iserializable, but it return me "Unable to activate instance of type from native handle" exception. Below are my codes. [FBUserParcel.cs] ``` using System; using Android.OS; using PlayCardLeh.Helpers; namespace PlayCardLeh.Android { public class FBUserParcel:Java.Lang.Object, Java.IO.ISerializable { Xamarin.Facebook.Model.IGraphUser fbUser; public FBUserParcel (Xamarin.Facebook.Model.IGraphUser user) { fbUser = user; } } } ``` [MainActivity.cs] ``` private async Task FindFBUser(Xamarin.Facebook.Model.IGraphUser user) { if (user != null) { Console.WriteLine ("GOT USER: " + user.Name); try { var t = await User.FindUserWithFBID (user); } catch(NotFound NotFound) { RunOnUiThread (() => { Intent i = new Intent (this,typeof (RegisterActivity)); FBUserParcel u = new FBUserParcel(user); StartActivity (i); }); } } else Console.WriteLine ("Failed to get 'me'!"); } ``` RegisterActivity.cs ``` protected override void OnCreate (Bundle bundle) { base.OnCre…

Accepted Answer

Well you could solve it easily by just serializing `Xamarin.Facebook.Model.IGraphUser` with any serializer which produces `string` or `byte[]`. For example if you use Newtonsoft's Json.NET component your code would look something like that:

```
Xamarin.Facebook.Model.IGraphUser fbUser;
var fbUserSerialized = JsonConvert.SerializeObject (fbUser);
intent.PutExtra ("fbUser");
```

And to deserialize:

```
if (Intent.HasExtra ("fbUser")) {
    var fbUserSerialized = Intent.GetStringExtra ("fbUser");
    var fbUser = JsonConvert.DeserializeObject<Xamarin.Facebook.Model.IGraphUser>(fbUserSerialized);
}
```

Java.IO.ISerializable Xamarin

Solution

Problem