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WebView myWebView = (WebView) getActivity().findViewById(R.id.webview);
myWebView.setWebViewClient(new WebViewClient() {
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        // this fires when the IUAM navigated to the captcha JSON
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            view.evaluateJavascript(
                "(function() { return ('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>'); })();",
                new ValueCallback < String > () {
                    @Override
                    public void onReceiveValue(String html) {
                        // here is the logic for captcha getting
                        System.out.println(html);
                    }
                });
        }
        return false;
    }
});

// should be non-browser otherwise it will never complete. use for example fourchan/1.0
myWebView.getSettings().setUserAgentString(UserAgentProvider.getInstance().getUserAgent());
myWebView.setHorizontalScrollBarEnabled(true);
myWebView.setVerticalScrollBarEnabled(true);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
// notice that user should make a gesture.
myWebView.loadUrl("https://sys.4chan.org/captcha?board=b");