public void setOnRendererCompleted(OnRendererCompleted onRendererCompleted) {
        this.onRendererCompleted = onRendererCompleted;
    }
Sets the listener for the completion of rendering, ie : when the GL thread holding the {@link JmeSurfaceView}
joins the UI thread, after asynchronous rendering.

@param onRendererCompleted an instance of the interface {@link OnRendererCompleted}.
jme3-android/src/main/java/com/jme3/view/surfaceview/JmeSurfaceView.java