How to listen for canGoBack() and canGoForward()?

Issue

I know I can query if a WebView widget can go back or forward using the canGoBack() and canGoForward() methods. But I want to enable (or disable) toolbar buttons depending on whether the WebView can go back or forward and I don't want to poll canGoBack() and canGoForward() all the time so I'd need something like a listener that is called whenever the state of canGoBack() or canGoForward() changes.

Is something like that available? I fail to find anything like that in the WebView docs.

Solution

as far as I know there is no such listener, but what we can do is

setWebViewClient(new WebViewClient() {
   @Override
        public void onPageFinished(final WebView view, final String url) {
            super.onPageFinished(view, url);
            if (view.canGoBack()) {
                //enable back button
            } else {
                //disable back button
            }
            if (view.canGoForward() {
                //enable forward button
            } else {
                //disable forward button
            }
        } 
});

Answered By - stallianz