android webview无网络情况下的处理

import com.yck.utils.diy.LoadingDialog;
import com.yck.utils.net.HttpUrl;
import com.yck.utils.tools.MyLog;

import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import cn.ijgc.goldplus.MyApplication;
import cn.ijgc.goldplus.R;
import cn.ijgc.goldplus.finance.ui.FinanceNxbIntroduceActivity;

public class DiscoverInformationFragment extends Fragment {

   private static final String TAG = FinanceNxbIntroduceActivity.class.getSimpleName();
   private String errorHtml = "";
   WebView webView;

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      return inflater.inflate(R.layout.discover_information, container, false);
   }

   @Override
   public void onActivityCreated(Bundle savedInstanceState) {
      super.onActivityCreated(savedInstanceState);
      errorHtml = "
";

      webView = (WebView) getView().findViewById(R.id.web_include_webview);
      webView.getSettings().setDefaultTextEncodingName("UTF-8");
      webView.getSettings().setJavaScriptEnabled(true);
      initWebView();
      webView.loadUrl(HttpUrl.appInfo);
   }

   private void initWebView() {
      // 设置WebView属性，能够执行JavaScript脚本
      webView.getSettings().setJavaScriptEnabled(true);
      // 设置不要缓存
      webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
      // 如果要播放Flash，需要加上这一句
      // webView.getSettings().setPluginsEnabled(true);

      WebSettings ws = webView.getSettings();
      ws.setSupportZoom(true); // 设置可以支持缩放
      // ws.setUseWideViewPort(true);
      ws.setLoadWithOverviewMode(true);
      webView.setWebViewClient(new MyWebViewClient());
   }

   class MyWebViewClient extends WebViewClient {

      @Override
      public boolean shouldOverrideUrlLoading(WebView view, String url) {
         MyLog.e(TAG, "shouldOverrideUrlLoading");
         //view.loadUrl(url);
         return super.shouldOverrideUrlLoading(view, url);
         //return  true;
      }

      @Override
      public void onPageStarted(WebView view, String url, Bitmap favicon) {
         MyLog.e(TAG, "onPageStarted");
         super.onPageStarted(view, url, favicon);
         //showLoadingDialog();
      }

      @Override
      public void onPageFinished(WebView view, String url) {
         MyLog.e(TAG, "onPageFinished");
         //closeLoadingDialog();
         super.onPageFinished(view, url);
      }

      @Override
      public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
         super.onReceivedError(view, errorCode, description, failingUrl);
         view.loadData(errorHtml, "UTF-8", "text/html");
      }
   }

   /**
    * 关闭进度条
    */
   public void closeLoadingDialog() {
      if (loadDialog != null) {
         loadDialog.dismiss();
      }
   }

   /**
    * 加载进度条
    */
   LoadingDialog loadDialog = null;

   public void showLoadingDialog() {
      if (loadDialog == null && this.getActivity() != null && !this.getActivity().isFinishing()) {
         loadDialog = new LoadingDialog(getActivity());
         loadDialog.setInverseBackgroundForced(false);
         loadDialog.setCanceledOnTouchOutside(false);
         loadDialog.setOnCancelListener(new OnCancelListener() {
            @Override
            public void onCancel(DialogInterface dialog) {
               dialog.dismiss();
               MyApplication.getInstance().cancelPendingRequests(TAG);
            }
         });
      }
      if(loadDialog != null){
         loadDialog.show();
      }
   }
}