Webview, контроль загрузки страниц

webView = (WebView) findViewById(R.id.web_view);
 
webView.loadUrl(url);
 
webView.setWebViewClient(new WebViewClient() {});
webView.setWebChromeClient(new WebChromeClient() {});

@Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
    Toast.makeText(getApplicationContext(), "shouldOverrideUrlLoading", Toast.LENGTH_SHORT).show();
    return super.shouldOverrideUrlLoading(view, request);
}
 
@Override
public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
    Handler handler = new Handler(getMainLooper());
    handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(getApplicationContext(), "shouldInterceptRequest", Toast.LENGTH_SHORT).show();
            }
        });
 
    return super.shouldInterceptRequest(view, request);
}

view.setWebViewClient(new WebViewClient(){
            @Override
            public void onPageFinished(WebView view, String url) {
 
                String javascript_promise = "javascript:"+PROMISE_JS;
                view.loadUrl(javascript_promise);
                //reload script on server
                String reloadString = "var head= document.getElementsByTagName('head')[0];\n" +
                        "      var script= document.createElement('script');\n" +
                        "      script.type= 'text/javascript';\n" +
                        "      script.src= someUrl;\n" +
                        "      head.appendChild(script);";
                String reload = "javascript:"+reloadString;
                view.loadUrl(reload);
                // re-run
                view.loadUrl( "javascript:var scripts = document.querySelectorAll('script'); var news = document.createElement('script'); news.setAttribute('type','text/javascript'); news.appendChild(document.createTextNode(scripts[scripts.length-4].innerText)); document.head.appendChild(news);" );
             }