Android WebView的几个操作

1. 打开网页时不调用系统浏览器， 而是在本WebView中显示：

[java] view plaincopyprint?

1. mWebView.setWebViewClient(new WebViewClient(){  
2.       @Override  
3.       public boolean shouldOverrideUrlLoading(WebView view, String url) {  
4.           view.loadUrl(url);  
5.           return true;  
6.       }  
7.   });  

2. 通过java代码调用javascript

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1. WebSettings webSettings =   mWebView .getSettings();         
2. webSettings.setJavaScriptEnabled(true);   
3. mWebView.addJavascriptInterface(new Object() {         
4.             public void clickOnAndroid() {         
5.                 mHandler.post(new Runnable() {         
6.                     public void run() {         
7.                         webview.loadUrl("javascript:wave()");         
8.                     }         
9.                 });         
10.             }         
11.         }, "demo");    

3. 按返回键时， 不退出程序而是返回上一浏览页面：

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1. public boolean onKeyDown(int keyCode, KeyEvent event) {         
2.         if ((keyCode == KeyEvent.KEYCODE_BACK) &&   mWebView .canGoBack()) {         
3.             webview.goBack();         
4.                    return true;         
5.         }         
6.         return super.onKeyDown(keyCode, event);         
7.     }  

4. 打开页面时， 自适应屏幕：

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1. WebSettings webSettings =   mWebView .getSettings();         
2. webSettings.setUseWideViewPort(true);  
3. webSettings.setLoadWithOverviewMode(true);  

5. 便页面支持缩放：

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1. WebSettings webSettings =   mWebView .getSettings();         
2.  webSettings.setJavaScriptEnabled(true);    
3.  webSettings.setBuiltInZoomControls(true);  
4. webSettings.setSupportZoom(true);