Ich erstelle eine Anwendung, die WebView verwendet, um auf eine Online-Website zuzugreifen. Ich stecke fest, wo ich Code hinzufügen muss, um die Verfügbarkeit der Seite zu überprüfen.

public class SpartanWeb extends Activity {

WebView mWebView;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Adds Progrss bar Support
    this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
    setContentView(R.layout.main);

    // Makes Progress bar Visible
    getWindow().setFeatureInt(Window.FEATURE_PROGRESS,
            Window.PROGRESS_VISIBILITY_ON);

    // Get Web view
    mWebView = (WebView) findViewById(R.id.webView1);
    WebSettings websettings = mWebView.getSettings();
    websettings.setJavaScriptEnabled(true);
    mWebView.stopLoading();
    mWebView.clearCache(true);
    mWebView.loadUrl("http://google.com");
    mWebView.setHorizontalScrollBarEnabled(false);
    mWebView.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
    mWebView.setWebViewClient(new WebViewClient());
    mWebView.setDownloadListener(new DownloadListener() {
        public void onDownloadStart(String url, String userAgent,
                String contentDisposition, String mimetype,
                long contentLength) {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setData(Uri.parse(url));
            startActivity(intent);
        }
    });

    // onProgressChanged
    final Activity MyActivity = this;
    mWebView.setWebChromeClient(new WebChromeClient() {
        public void onProgressChanged(WebView view, int progress) {
            // bar disappear after URL is loaded, and changes string to
            // Loading...
            MyActivity.setTitle("Loading...");
            MyActivity.setProgress(progress * 100); // Make the bar
                                                    // disappear after URL
                                                    // is loaded

            // Return the app name after finish loading
            if (progress == 100)
                MyActivity.setTitle(R.string.app_name);
        }
    });

}// EOM oc

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
        mWebView.goBack();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

}

Ich versuche, @ hinzuzufüg onReceivedError aber aus irgendeinem Grund wird die benutzerdefinierte Seite nicht geladen.

/** Called when the activity is first created. */
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) 
{
mWebView.loadUrl("file:///android_asset/error.html");
}

Bitte raten Sie, was zu tun ist.