在用webview加载html页面时候，有时候会用到setWebClient和setWebChromeClient,他们之间的不同在于：

1.setWebClient就是帮助WebView处理各种通知、请求事件

onLoadResource 

onPageStart 

onPageFinish 

onReceiveError 

onReceivedHttpAuthRequest 

webview1.setWebViewClient(new WebViewClient() {   
                    
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)   
           { // Handle the error  
                   Toast.makeText(getApplicationContext(), "网络连接失败 ,请连接网络。", Toast.LENGTH_SHORT).show();
            }
                   public boolean shouldOverrideUrlLoading(WebView view, String url) { 
                                view.loadUrl(url); 
                                  returntrue; 
         } 
});

2.setWebChromeClient辅助WebView处理JavaScript的对话框，网站图标，网站title，加载进度等

onCloseWindow(关闭WebView) 

onCreateWindow() 

onJsAlert (WebView上alert是弹不出来东西的，需要定制你的WebChromeClient处理弹出) 

onJsPrompt 

onJsConfirm 

onProgressChanged 

onReceivedIcon 

onReceivedTitle

例如添加进度条：

webview1.setWebChromeClient(new WebChromeClient()
        {          
            public void onProgressChanged(WebView view, int progress)   
            {   
                setProgress(progress * 100);     
                if(progress == 100){     
                    imageView1.setVisibility(View.GONE);
                    tv1.setVisibility(View.GONE);
                    pb1.setVisibility(View.GONE);
                    fy1.setVisibility(View.GONE);
                }
            }
        }
        );    

webView.getSettings().setJavaScriptEnabled(true);//支持js
webView.getSettings().setSupportZoom(true);//支持缩放
webView.getSettings().setBuiltInZoomControls(true);//出现缩放按钮