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I want to block a link from loading within a Webview.

Code

public class WebMy extends Activity { private WebView mWebview; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.pantalla); getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); mWebview = new WebView(this); mWebview.setWebViewClient(new WebViewClient()); mWebview.getSettings().setJavaScriptEnabled(true); // Enable JavaScript. mWebview .loadUrl("http://www.myweb.com"); setContentView(mWebview ); }

Potential Solution

public class MyWebViewClient extends WebViewClient { public boolean shuldOverrideKeyEvent (WebView view, KeyEvent event) { // Do something with the event here. return true; } public boolean shouldOverrideUrlLoading (WebView view, String url) { if (Uri.parse(url).getHost().equals("www.google.com")) { // This is my web site, so do not override; let my WebView load the page. return false; } // Reject everything else. return true; } }

I don´t know how I have to use this in my code. For example, if I want to block this url http://www.myweb.com/pepito. How can I do this with this code? Thank you.

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6 Answers 6

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4

shouldOverrideUrlLoading will examine the web page URL loaded into the WebView and all URLs loaded within the page content.

public class MyWebViewClient extends WebViewClient { public boolean shouldOverrideKeyEvent (WebView view, KeyEvent event) { return true; } public boolean shouldOverrideUrlLoading (WebView view, String url) { if (Uri.parse(url).getHost().equals("http://www.myweb.com/pepito")) { // This is my web site, so do not override; let the WebView load the page. return false; } // Reject everything else. return true; } }
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3 Comments

Replace your code line mWebview.setWebViewClient(new WebViewClient()); with mWebview.setWebViewClient(new MyWebViewClient());
Provide another check inside the if statement. Like , if(Uri.parse(url).getHost().equals("myweb.com/pepito") || Uri.parse(url).getHost().equals("2nd url to block")) {}
Thank you!!! my last question, is that possible to block a link like this href="mailto:[email protected]", I have try but not works
2

this will cause nothing to happen when the link "http://www.myweb.com/pepito" is clicked

public class MyWebViewClient extends WebViewClient { public boolean shuldOverrideKeyEvent (WebView view, KeyEvent event) { // Do something with the event here return true; } public boolean shouldOverrideUrlLoading (WebView view, String url) { return url.equals("http://www.myweb.com/pepito"); } }
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0 
 webView.setWebViewClient(new myWebClient()); // add this while initializing webview // then do add following code public class myWebClient extends WebViewClient { @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { // TODO Auto-generated method stub // super.onPageStarted(view, url, favicon); if (Uri.parse(url).getHost().contains("https://qa.mstitute.com/test/build/#!/")) { // This is my web site, so do not override; let my WebView load the page Log.d("web","block"); }else{ super.onPageStarted(view, url, favicon); } Log.d("web","Started"); } @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { // TODO Auto-generated method stub if (Uri.parse(url).getHost().equals("https://qa.mstitute.com/test/build/#!/")) { // This is my web site, so do not override; let my WebView load the page Log.d("web","block"); return false; }else { view.loadUrl(url); return true; } } @Override public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) { super.onReceivedError(view, request, error); Log.d("web","got an error"); } @Override public void onPageFinished(WebView view, String url) { // TODO Auto-generated method stub } }
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0

For Xamarin Developers (it can be adapted to Native also), this is an updated answer because the method ShouldOverrideUrlLoading(WebView view, string url) is obsolete:

[System.Obsolete] public override bool ShouldOverrideUrlLoading(WebView view, string url) { return !Uri.Parse(url).Host.Contains("YOUR_URL"); } public override bool ShouldOverrideUrlLoading(WebView view, IWebResourceRequest request) { return !request.Url.ToString().Contains("YOUR_URL"); }
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You can block certain URL from loading in your WebView by validating it against a blacklist or a whitelist before allowing the WebView to load it, some of the previous responses here rely on the deprecated shouldOverrideUrlLoading which takes in a string URL. The new method takes in WebResourceRequest object instead, a basic implementation would look like:

public class MyWebViewClient extends WebViewClient { private static BLACKLISTED_URLS = ImmutableList.of("www.google.com", "www.facebook.com"); public boolean shouldOverrideKeyEvent (WebView view, KeyEvent event) { return true; } public boolean shouldOverrideUrlLoading (WebView view, WebResourceRequest request) { if (BLACKLISTED_URLS.contains(Uri.parse(request.getUrl()).getHost())) { return true; } return false; } }

Please note that allowing your WebView to load urls from user-controlled intents would make it vulnerable to WebView loadurl injection.

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Solution 1

class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val webView : WebView = findViewById(R.id.webView) webView.webViewClient = object : WebViewClient() { override fun shouldOverrideUrlLoading(view: WebView?, url: String?): Boolean { // This is my web site, so do not override; let the WebView load the page. if (Uri.parse(url).host == "google.com") return false // Reject everything else. return true } } } }

Solution 2

class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val webView : WebView = findViewById(R.id.webView) webView.webViewClient = MyWebViewClient() } private class MyWebViewClient : WebViewClient() { override fun shouldOverrideUrlLoading(view: WebView?, url: String?): Boolean { // This is my web site, so do not override; let the WebView load the page. if (Uri.parse(url).host == "google.com") return false // Reject everything else. return true } } }

if (Uri.parse(url).host == "google.com") return false This code wont allow to go google

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