onProgressChanged not working in android

here is my code
```
_onProgressChanged = flutterWebviewPlugin.onProgressChanged.listen((double newProgress) {
print(newProgress);
});
```
but progress value doesn't print at all in android devices but in IOS devices it works fine
can anyone help me?

Start at the plugin's onProgressChanged entry point and compare its Android behavior with the working iOS behavior. Reproduce the provided listener on an Android device, then verify that progress values are emitted and printed as expected.

Scritto dal modello di indicizzazione a partire dal testo della issue.