webview.setWebViewClient(new WebViewClient(){  
            public boolean shouldOverrideUrlLoading(WebView view,String url){  
                //當有新連線時，使用當前的 WebView  
                view.loadUrl(url);
                //呼叫撥號程式
                if (url.startsWith("mailto:") || url.startsWith("geo:") ||url.startsWith("tel:")) {
                  Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
                   startActivity(intent);
                  }
                return true;  
            }  
        });