[Android] Call .jar function on render thread using JNI

Hi,

I have a unity AR app that I want to use some custom GLES rendering on. I've got everything working with regards to generating .jar files and calling the methods on those .jar files (using JNI)

But I need a way to call methods on the render thread. So far, I've see many examples that show how to write native android plugins in Java and call methods from Unity C# using JNI, but all of them use activityContext.Call("runOnUiThread", new AndroidJavaRunnable(()... . like so.

 void RunOnRenderThread()
     {
         using(AndroidJavaClass pluginClass = new AndroidJavaClass("com.company.testplugin")) {
             if(pluginClass != null) {
                 exampleObject = pluginClass.CallStatic<AndroidJavaObject>("instance");
                 activityContext.Call("runOnUiThread", new AndroidJavaRunnable(() => {
                     exampleObject.Call("initTextureId", textureID);
                 }));
             }
         }
     }

Is there a runOnRenderThread instead of runOnUiThread.

If not how can I get render thread from unity context? (AndroidJavaClass("com.unity3d.player.UnityPlayer"))