Detecting Webview Error and Show Message

Detecting Webview Error and Show Message

All answer above are deprecated.
You should use this code after on Page finished

 @Override
    public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error){
           //Your code to do
        Toast.makeText(getActivity(), "Your Internet Connection May not be active Or " + error.getDescription(), Toast.LENGTH_LONG).show();
    }

How to handle errors inside webview?

Check as:

 public void onReceivedError(WebView view, int errorCode, 
                           String description, String failingUrl) {
             Log.e("ProcessPayment", "onReceivedError = " + errorCode);

            //404 : error code for Page Not found
             if(errorCode==404){
               // show Alert here for Page Not found
               view.loadUrl("file:///android_asset/Page_Not_found.html");
             }
            else{

              }
           }

Android app show an error message if web server is offline

You should use this code after on Page finished

 @Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error){
       //Your code to do
    Toast.makeText(getActivity(), "Your Internet Connection May not be active Or " + error , Toast.LENGTH_LONG).show();
}

Other method : You can check if the url code return a 200 with a GET request. If it's something else then 200 then the server is down.

You can find more informations here :
https://stackoverflow.com/a/37145639/9005570

How to check if webview failed to load page (android)?

Use a WebClient on your web view as follow :

webView.setWebViewClient(new WebViewClient(){

@Override public void onReceivedError(WebView view, WebResourceRequest request,
      WebResourceError error) {
    super.onReceivedError(view, request, error);
    // Do something
  }
});

Swift : how to show error message in webview when there is no internet connection?

You can use the delegate method:

func webView(_ webView: UIWebView, didFailLoadWithError error: Error) {
    print("webview did fail load with error: \(error)")

    let message: String = error.localizedDescription

    let alert = UIAlertController(title: "something", message: message, preferredStyle: .alert)
    alert.addAction(UIAlertAction(title: "Ok", style: .default) { action in
    // use action here
    })
    self.present(alert, animated: true)
}

WebView detect when website has loaded successfully

One way to do this: Use this (deprecated but still functional) api. Will be called for the main url you are loading, not every web resource like the newer version. This should take care of both no internet connection and http error responses.

@SuppressWarnings("deprecation")
override fun onReceivedError(view: WebView, errorCode: Int, description: String, failingUrl: String) {
//hide it, etc...
              // println("ON receive error:  $errorCode  $description  $failingUrl")
}

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