Barcodescanner do not work in my case

I try to import CustomWebView : An extended form of Web Viewer latest custoimwebview but situation is the same.
There is a way to avoid any interference? my app running correctly using access via browser . only reason to use mt 2 was to create app is only to can pubblish it on google store. there is a way to bypass this problem with barcode scanner? I can try to publish the version