How can I use flutterWebviewPlugin.onStateChanged.listen?

[lizhuoyuan]

[lizhuoyuan]

_onStateChanged =
        flutterWebviewPlugin.onStateChanged.listen((WebViewStateChanged state) {
      if (mounted) {
        switch (state.type) {
          case WebViewState.startLoad:
            setState(() {
              isloading = true;
            });
            break;
          case WebViewState.shouldStart:
            setState(() {
              isloading = true;
            });
            break;
          case WebViewState.finishLoad:
            setState(() {
              isloading = false;
            });
            break;
        }
      }
    });

I did this ,maybe this is right.