How to retrieve Javascript function value in webview component

Question

How can I retrieve the Javascript function value from a web page loaded withing a webview component??

Answer 1

You can't, directly.

You can call the Javascript function via loadUrl("javascript:..."), where ... is your function call. However, you cannot get a result this way.

If you inject a Java object into the Web page via addJavascriptInterface(), you could set up another function that called the function you want and returns that value via a call to the injected Java object. That only works if you can modify the Web page, though.