如何在WebView Android中使用“重新加载”按钮添加自定义错误消息？

大家好，我正在为我的网站创建一个web视图应用程序 问题是，当internet不可用时，webview会显示网页不可用

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但我想要的是显示一条消息&一个重新加载按钮，上面写着“你需要连接到互联网才能使用这个应用，打开互联网后按重新加载”。提前谢谢

只需在打开webView时检查网络连接即可

在这里，我为您提供了同样的方法

public boolean isConnectingToInternet() {
    ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    @SuppressWarnings("deprecation")
    NetworkInfo wifiNetwork = cm
            .getNetworkInfo(ConnectivityManager.TYPE_WIFI);
    if (wifiNetwork != null && wifiNetwork.isConnected()) {
        return true;
    }

    @SuppressWarnings("deprecation")
    NetworkInfo mobileNetwork = cm
            .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
    if (mobileNetwork != null && mobileNetwork.isConnected()) {
        return true;
    }

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected()) {
        return true;
    }

    return false;

}

public void showAlert(String msg) {

          ContextThemeWrapper themedContext;
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
           themedContext = new ContextThemeWrapper(context,android.R.style.Theme_Holo_Light_Dialog_NoActionBar);
          } else {
           themedContext = new ContextThemeWrapper(
             context,
             android.R.style.Theme_Light_NoTitleBar);
          }

            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                    themedContext);

            alertDialogBuilder.setTitle(context.getResources().getString(R.string.app_name));
            alertDialogBuilder.setCancelable(false);
            alertDialogBuilder.setMessage(msg).setPositiveButton("Reload",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                                //Call webview again.
                                dialog.cancel();

                        }
                    });
            AlertDialog alertDialog = alertDialogBuilder.create();
            alertDialog.show();

        }

在这里我分享同样的方法

public boolean isConnectingToInternet() {
    ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    @SuppressWarnings("deprecation")
    NetworkInfo wifiNetwork = cm
            .getNetworkInfo(ConnectivityManager.TYPE_WIFI);
    if (wifiNetwork != null && wifiNetwork.isConnected()) {
        return true;
    }

    @SuppressWarnings("deprecation")
    NetworkInfo mobileNetwork = cm
            .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
    if (mobileNetwork != null && mobileNetwork.isConnected()) {
        return true;
    }

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected()) {
        return true;
    }

    return false;

}

public void showAlert(String msg) {

          ContextThemeWrapper themedContext;
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
           themedContext = new ContextThemeWrapper(context,android.R.style.Theme_Holo_Light_Dialog_NoActionBar);
          } else {
           themedContext = new ContextThemeWrapper(
             context,
             android.R.style.Theme_Light_NoTitleBar);
          }

            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                    themedContext);

            alertDialogBuilder.setTitle(context.getResources().getString(R.string.app_name));
            alertDialogBuilder.setCancelable(false);
            alertDialogBuilder.setMessage(msg).setPositiveButton("Reload",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                                //Call webview again.
                                dialog.cancel();

                        }
                    });
            AlertDialog alertDialog = alertDialogBuilder.create();
            alertDialog.show();

        }

调用此方法

showAlert（“您需要连接到internet才能使用此应用程序，请在打开internet后按重新加载”）

webview.loadUrl（“关于：空白”）；但是如何显示警告（“您需要连接到internet才能使用此应用程序，请在打开internet后按重新加载”）&重新加载按钮？