java.lang.ClassNotFoundException when sending a message from Unity to Flutter (Android)

[timonvw]

I get this error in the debug console (Android Studio) when I send a message in Unity to Flutter.

Error:

E/Unity ( 8367): java.lang.ClassNotFoundException: Didn't find class "com/reactnative/unity/view/UnityUtils" on path: DexPathList[[zip file "/system/framework/org.apache.http.legacy.boot.jar", zip file "/data/app/com.rexraphael.flutterunitywidgetexample-A3IZZoUXENEbVBkqDGNLAQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.rexraphael.flutterunitywidgetexample-A3IZZoUXENEbVBkqDGNLAQ==/lib/arm64, /data/app/com.rexraphael.flutterunitywidgetexample-A3IZZoUXENEbVBkqDGNLAQ==/base.apk!/lib/arm64-v8a, /system/lib

Code Unity:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Rotate : MonoBehaviour
{
    [SerializeField]
    //Vector3 RotateAmount;
    private float rotSpeed = 5f;

    private UnityMessageManager messanger;
    

    // Start is called before the first frame update
    void Start()
    {
        messanger = new UnityMessageManager();
    }

    private void OnMouseDrag()
    { 
        //Rotate object
        float rotX = Input.GetAxis("Mouse X") * rotSpeed * Mathf.Deg2Rad;
        transform.RotateAround(Vector3.up, -rotX);

        //send message to FLutter
        messanger.SendMessageToFlutter("Test");
    }
}

[rafbanaan]

I'm having the same issue here.

[thomas-stockx]

Hey guys, sorry for the late reply.

Be sure you use the latest UnityMessageManager.cs from the scripts folder.
The issue you're reporting should've been fixed by this PR: #29