android调用H5显示加载中效果的示例代码

wv.setWebViewClient(new WebViewClient() { 
               @Override 
               public void onPageStarted(WebView view,String url,Bitmap favicon) { 
                 super.onPageStarted(view,url,favicon); 
                 DialogUtils.showUpdateDialog(MainActivity.this,"加载中","请稍后。。。"); 
               } 
 
               @Override 
               public void onPageFinished(WebView view,String url) { 
                 super.onPageFinished(view,url); 
                 DialogUtils.hideDialog(); 
               } 
 
               @Override 
               public void onReceivedError(WebView view,WebResourceRequest request,WebResourceError error) { 
                 super.onReceivedError(view,request,error); 
                 Toast.makeText(MainActivity.this,"网页加载错误，请稍后重试",Toast.LENGTH_SHORT).show(); 
               } 
 
               @Override 
               public boolean shouldOverrideUrlLoading(WebView view,String url) { 
                 return true; 
               } 
             }