How to handle errors from webView?

Question

I have this code:

    WebChromeClient webViewChromeClient = new WebChromeClient() {
        public void onProgressChanged(WebView view, int progress){
        }
    };

    webView.setWebChromeClient(webViewChromeClient);

    WebViewClient webViewClient = new WebViewClient() {
        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)
        {
            super.onReceivedError(view, errorCode, description, failingUrl);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url)
        {
            view.loadUrl(url);
            return true;
        } 
    };

And I want to handle errors (404 or error if connection broken) in such a way that in the view showed nothing.

How to do it?

Take a look at this topic: http://stackoverflow.com/questions/4997677/android-webview-onreceivederror This helped me quite a lot!! — MartijnG, Nov 22 '11 at 10:59
MartijnG: Yes, I saw this but does not call me a function onReceivedError... — Nips, Nov 22 '11 at 11:06
are you attaching the webViewClient to your webView with webView.setWebViewClient(webViewClient );??? — Raymond Arteaga, Nov 10 '18 at 17:01

eli · Answer 1 · 2020-07-01T06:47:41.963

WebView frequently calls application callbacks (via WebViewClient and WebChromeClient), From onReceivedError implement the function to catch and define the Thrown Exeption

  @Override
        public void onReceivedError(WebView view, int errorCode,
                String description, String failingUrl) {
             
            Log.i(TAG, "GOT Page error : code : " + errorCode + " Desc : " + description);
            showError(WebviewActivity.this, errorCode);
            //TODO We can show customized HTML page when page not found/ or server not found error. 
            super.onReceivedError(view, errorCode, description, failingUrl);
        }

Then using the following showError method you can understand what kind of exception has occured.

    private void showError(Context mContext, int errorCode) {
    //Prepare message
    String message = null; 
    String title = null;
    if (errorCode == WebViewClient.ERROR_AUTHENTICATION) {
        message = "User authentication failed on server";
        title = "Auth Error";
    } else if (errorCode == WebViewClient.ERROR_TIMEOUT) {
        message = "The server is taking too much time to communicate. Try again later.";
        title = "Connection Timeout";
    } else if (errorCode == WebViewClient.ERROR_TOO_MANY_REQUESTS) {
        message = "Too many requests during this load";
        title = "Too Many Requests";
    } else if (errorCode == WebViewClient.ERROR_UNKNOWN) {
        message = "Generic error";
        title = "Unknown Error";
    } else if (errorCode == WebViewClient.ERROR_BAD_URL) {
        message = "Check entered URL..";
        title = "Malformed URL";
    } else if (errorCode == WebViewClient.ERROR_CONNECT) {
        message = "Failed to connect to the server";
        title = "Connection";
    } else if (errorCode == WebViewClient.ERROR_FAILED_SSL_HANDSHAKE) {
        message = "Failed to perform SSL handshake";
        title = "SSL Handshake Failed";
    } else if (errorCode == WebViewClient.ERROR_HOST_LOOKUP) {
        message = "Server or proxy hostname lookup failed";
        title = "Host Lookup Error";
    } else if (errorCode == WebViewClient.ERROR_PROXY_AUTHENTICATION) {
        message = "User authentication failed on proxy";
        title = "Proxy Auth Error";
    } else if (errorCode == WebViewClient.ERROR_REDIRECT_LOOP) {
        message = "Too many redirects";
        title = "Redirect Loop Error";
    } else if (errorCode == WebViewClient.ERROR_UNSUPPORTED_AUTH_SCHEME) {
        message = "Unsupported authentication scheme (not basic or digest)";
        title = "Auth Scheme Error";
    } else if (errorCode == WebViewClient.ERROR_UNSUPPORTED_SCHEME) {
        message = "Unsupported URI scheme";
        title = "URI Scheme Error";
    } else if (errorCode == WebViewClient.ERROR_FILE) {
        message = "Generic file error";
        title = "File";
    } else if (errorCode == WebViewClient.ERROR_FILE_NOT_FOUND) {
        message = "File not found";
        title = "File";
    } else if (errorCode == WebViewClient.ERROR_IO) {
        message = "The server failed to communicate. Try again later.";
        title = "IO Error";
    }
     
    if (message != null) {
        new AlertDialog.Builder(mContext)
        .setMessage(message)
        .setTitle(title)
        .setIcon(android.R.drawable.ic_dialog_alert)
        .setCancelable(false)
        .setPositiveButton("OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        setResult(RESULT_CANCELED);
                        finish();
                    }
                }).show();
    }       
}

Create your custom view in res/layout folder name it to ic_dialog_alert add textviews for title and error message

Also the Webview be terminated by Resource rendering problem which can be handle by Termination Handling API

How to handle errors from webView?

1 Answers1