Question

如果WebView中没有可用的连接页面/提醒，我就会做某事（例如加载本地html页面或提醒）。我要玩Prevent WebView from displaying "web page not available"但没有任何成功。任何建议将不胜感激。

Answer 1

这一切都归结为只是从onReceivedError显示一个AlertDialog：

 @Override
 public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl) {
                    //Clearing the WebView
                    try {
                        webView.stopLoading();
                    } catch (Exception e) {
                    }
                    try {
                        webView.clearView();
                    } catch (Exception e) {
                    }
                    if (webView.canGoBack()) {
                        webView.goBack();
                    }
                    webView.loadUrl("about:blank");

                    //Showing and creating an alet dialog
                    AlertDialog alertDialog = new AlertDialog.Builder(youractivity.this).create();
                    alertDialog.setTitle("Error");
                    alertDialog.setMessage("No internet connection was found!");
                    alertDialog.setButton("Again", new DialogInterface.OnClickListener() {
                       public void onClick(DialogInterface dialog, int which) {
                           finish();
                           startActivity(getIntent());
                       }
                    });

                    alertDialog.show();

                    //Don't forget to call supper!
                    super.onReceivedError(webView, errorCode, description, failingUrl);
                }

如果您是WebView的新手，您将会像这样实现onReceivedError：

mWebView.setWebViewClient(new WebViewClient() {
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
        //Code here
    }
});

Answer 2

上面的代码给了我两个弃用警告，所以我建议修改如下。这包含在包含WebView组件的活动中：

    myWebView.setWebViewClient(new WebViewClient() {
        public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl) {
            try {
                webView.stopLoading();
            } catch (Exception e) {
            }

            if (webView.canGoBack()) {
                webView.goBack();
            }

            webView.loadUrl("about:blank");
            AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
            alertDialog.setTitle("Error");
            alertDialog.setMessage("Cannot connect to the R2R Server. Check your internet connection and try again.");
            alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "Try Again", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    finish();
                    startActivity(getIntent());
                }
            });

            alertDialog.show();
            super.onReceivedError(webView, errorCode, description, failingUrl);
        }
    });

Answer 3

    @Override 
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
        super.onReceivedError(view, errorCode, description, failingUrl);

// declare a text view in your xml
                sample_TextView.setText(R.string.no_internet_connection);

        view.loadUrl("about:blank");
    }

如何在Android WebView中显示自定义“网页不可用”页面？

3 个答案: