The shouldOverrideUrlLoading method is called whenever the WebView is about to load a URL. This implementation checks for the String "html5rocks.com" at the end of the host name of the URL. If the string exists, the method returns false, which tells the platform not to override the URL, but to load it in the WebView. For any other hostname, the method makes a request to the system to open the URL. It does this by creating a new Android Intent and using it to launch a new activity. Returning true at the end of the method prevents the URL from being loaded into the WebView.