Webview-Fehler erkennen und Meldung anzeigen

Ich möchte eine Fehlermeldung anzeigen, wenn beim Laden einer Webview-Seite ein Fehler auftritt (Keine Verbindung). Das ist, was ich bisher habe, ohne den Fehlerbehandlungscode:

public class TrackerPage extends Activity {

    // @Override
    private WebView webview;
    private ProgressDialog progressDialog;

    private boolean error;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Get rid of the android title bar
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        // Set the XML layout
        setContentView(R.layout.tracker_page);

        // Bundle objectbundle = this.getIntent().getExtras();
        webview = (WebView) findViewById(R.id.tracker);

        final Activity activity = this;

        // Enable JavaScript and lets the browser go back
        webview.getSettings().setJavaScriptEnabled(true);
        webview.canGoBack();

        webview.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }

            public void onLoadResource(WebView view, String url) {
                // Check to see if there is a progress dialog
                if (progressDialog == null) {
                    // If no progress dialog, make one and set message
                    progressDialog = new ProgressDialog(activity);
                    progressDialog.setMessage("Loading please wait...");
                    progressDialog.show();

                    // Hide the webview while loading
                    webview.setEnabled(false);
                }
            }

            public void onPageFinished(WebView view, String url) {
                // Page is done loading;
                // hide the progress dialog and show the webview
                if (progressDialog.isShowing()) {
                    progressDialog.dismiss();
                    progressDialog = null;
                    webview.setEnabled(true);
                }
            }

        });

        // The URL that webview is loading
        webview.loadUrl("http://url.org/");
    }
}

Wie würde ich das tun?

Alle obigen Antworten sind veraltet. Sie sollten diesen Code verwenden, nachdem Sie auf Seite fertig sind

 @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();
    }

Sie haben den größten Teil des Weges dorthin … Implementieren Sie es einfach onReceivedError und behandeln Sie die gewünschten Fehler.

Fügen Sie dies nach onpagefinished hinzu:

    public void onReceivedError(WebView view, int errorCod,String description, String failingUrl) {
            Toast.makeText(Webform.this, "Your Internet Connection May not be active Or " + description , Toast.LENGTH_LONG).show();
        }

Vergessen Sie nicht, android.widget.Toast zu importieren;

Aktualisierte Antwort gemäß API 23 Marshmallow

WebViewClient-Fehlerbehandlung

    /*
     * Added in API level 23 replacing :-
     *
     * onReceivedError(WebView view, int errorCode, String description, String failingUrl) 
    */
    @Override
    public void onReceivedError(WebView view, WebResourceRequest request,
            WebResourceError error) {

        Toast.makeText(getActivity(),
                "WebView Error" + error.getDescription(),
                Toast.LENGTH_SHORT).show();

        super.onReceivedError(view, request, error);

    }

    /*
      Added in API level 23
    */
    @Override
    public void onReceivedHttpError(WebView view,
            WebResourceRequest request, WebResourceResponse errorResponse) {

        Toast.makeText(getActivity(),
                "WebView Error" + errorResponse.getReasonPhrase(),
                Toast.LENGTH_SHORT).show();


        super.onReceivedHttpError(view, request, errorResponse);
    }

Behandlung von Netzwerkfehlern

        webView.loadUrl(urlToLoad);

        if (!isConnected(getActivity())) {
            Toast.makeText(getActivity(), "You are offline ", Toast.LENGTH_SHORT).show();

        }

     /**
     * Check if there is any connectivity
     * 
     * @param context
     * @return is Device Connected
     */
    public static boolean isConnected(Context context) {

        ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);

        if (null != cm) {
            NetworkInfo info = cm.getActiveNetworkInfo();

            return (info != null && info.isConnected());
        }
        return false;
    }

public class WebClient extends WebViewClient {

    @Override
    @TargetApi(Build.VERSION_CODES.M)
    public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
        super.onReceivedError(view, request, error);
        final Uri uri = request.getUrl();
        handleError(view, error.getErrorCode(), error.getDescription().toString(), uri);
    }

    @SuppressWarnings("deprecation")
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
        super.onReceivedError(view, errorCode, description, failingUrl);
        final Uri uri = Uri.parse(failingUrl);
        handleError(view, errorCode, description, uri);
    }

    private void handleError(WebView view, int errorCode, String description, final Uri uri) {
        final String host = uri.getHost();// e.g. "google.com"
        final String scheme = uri.getScheme();// e.g. "https"
        // TODO: logic
    }
}

in onReceivedError Methode behandeln wie unten

@SuppressWarnings("deprecation")
@Override
public void onReceivedError(WebView view, int errorCode, String description,        String failingUrl) {
    handleError(errorCode,view);
}

@TargetApi(android.os.Build.VERSION_CODES.M)
@Override
public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
    // Redirect to deprecated method, so you can use it in all SDK versions
    onReceivedError(view, rerr.getErrorCode(),rerr.getDescription().toString(),req.getUrl().toString());

}

HandleError-Methode unten

public static void handleError(int errorCode, WebView view) {
    
    String message = null;
    if (errorCode == WebViewClient.ERROR_AUTHENTICATION) {
        message = "User authentication failed on server";
    } else if (errorCode == WebViewClient.ERROR_TIMEOUT) {
        message = "The server is taking too much time to communicate. Try again later.";
    } else if (errorCode == WebViewClient.ERROR_TOO_MANY_REQUESTS) {
        message = "Too many requests during this load";
    } else if (errorCode == WebViewClient.ERROR_UNKNOWN) {
        message = "Generic error";
    } else if (errorCode == WebViewClient.ERROR_BAD_URL) {
        message = "Check entered URL..";
    } else if (errorCode == WebViewClient.ERROR_CONNECT) {
        message = "Failed to connect to the server";
    } else if (errorCode == WebViewClient.ERROR_FAILED_SSL_HANDSHAKE) {
        message = "Failed to perform SSL handshake";
    } else if (errorCode == WebViewClient.ERROR_HOST_LOOKUP) {
        message = "Server or proxy hostname lookup failed";
    } else if (errorCode == WebViewClient.ERROR_PROXY_AUTHENTICATION) {
        message = "User authentication failed on proxy";
    } else if (errorCode == WebViewClient.ERROR_REDIRECT_LOOP) {
        message = "Too many redirects";
    } else if (errorCode == WebViewClient.ERROR_UNSUPPORTED_AUTH_SCHEME) {
        message = "Unsupported authentication scheme (not basic or digest)";
    } else if (errorCode == WebViewClient.ERROR_UNSUPPORTED_SCHEME) {
        message = "unsupported scheme";
    } else if (errorCode == WebViewClient.ERROR_FILE) {
        message = "Generic file error";
    } else if (errorCode == WebViewClient.ERROR_FILE_NOT_FOUND) {
        message = "File not found";
    } else if (errorCode == WebViewClient.ERROR_IO) {
        message = "The server failed to communicate. Try again later.";
    }
    if (message != null) {
        Toast.makeText(getActivity(), "" + message, Toast.LENGTH_LONG).show();
    }
}