Help please

I have implemented the code in my project and it opens an advanced WebView 'web view' but I am struggling with the setlistener method returning the path to an image back to the webview.

Where would I place this code in an Androidx, nav drawer, fragment with 'view model' Kotlin project?

The project advises: Add the following code to the parent FragmentActivity in order to forward the results from the FragmentActivity to the appropriate Fragment instance-

public class MyActivity extends FragmentActivity implements AdvancedWebView.Listener {

@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if (mFragment != null) {
mFragment.onActivityResult(requestCode, resultCode, intent);
}
}

}