Sunday, July 22, 2018

Disabling alert/popup for Android Webview ChromeClient

By Hường Hana 10:00 AM , , Leave a Comment

I am working on an app which has an activity/fragment that displays web pages for certain sites. Android webview (chrome) is popping up alert dialogs for subscribing to push notifications in some of them, which is causing weird flashing/flickering issue.

This is the section for webview and it's settings

    WebSettings webSettings = webView.getSettings();     webSettings.setJavaScriptEnabled(true);     webSettings.setJavaScriptCanOpenWindowsAutomatically(false);     webSettings.setDomStorageEnabled(true);     webSettings.setAppCacheEnabled(true);     webSettings.setAppCacheMaxSize(5 * 1024 * 1024);     webSettings.setAppCachePath("");     webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);     webSettings.setUserAgentString(mUserAgent);      webView.setBackgroundColor(Color.argb(1, 0, 0, 0));     webView.setWebChromeClient(new WebChromeClient() {          @Override         public void onReceivedTitle(WebView view, String title) {             super.onReceivedTitle(view, title);             BaseWebViewFragment.this.onReceivedTitle(title);         }          @Override         public void onProgressChanged(WebView view, int newProgress) {             super.onProgressChanged(view, newProgress);             progressChanged(view, newProgress);         }     });

I need to disable these popups completely but cannot find a way to do it.

I tried disabling JS completely, but it causes loading issue for some of the sites.

I also tried overriding the onJS...() methods for WebChromeClient and canceling/confirming the result but to no avail.

Whats the working approach for this?

1 Answers

Answers 1

Similar to this you should get html as string and insert this script tag in its head

  <script type = "text/javascript">     window.alert = function() {};   </script>

so if your html string is htmlStr, it's something like this:

String script = "<script type = \"text/javascript\">\n" +                 "        window.alert = function() {}\n" +                 "      </script>"; String target = "<head>";  int ind = htmlStr.indexOf(target); StringBuilder htmlBuilder = new StringBuilder(htmlStr); htmlBuilder.insert(ind + target.length(), script); String newHtml = htmlBuilder.toString();

and then load the newHtml into WebView by something like this:

webView.loadDataWithBaseURL(null, newHtml, "text/html", "UTF-8", null);
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