安卓开发7- WebView支持open、alert、confirm等js

采用WebView实现安卓手机OA时，OA系统中有js的alert、confirm、window.open()不起做用。要点：重载WebChromeClient类；实现alert对应的onJsAlert，confirm对应的onJsConfirm，window.open对应的onCreateWindow；setSupportMultipleWindows支持弹出窗口；setWebViewClient支持在webview上打开链接。

 

使用webView. setWebChromeClient(new WebChromeClient())

         当webView. setWebChromeClient(new WebChromeClient())后，默认已实现alert和confirm方法。可是提示窗口标题有带url，并且window.open没有反应。要自定义alert和confirm窗口和实现window.open须要重载WebChromeClient。

        

新建类MyWebChromeClient，继承WebChromeClient

(一)重载onJsAlert方法实现js的alert

         public boolean onJsAlert(WebView view, String url, String message, JsResult result) {

                   final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());

 

                   builder.setTitle("OA提示信息")

                   .setMessage(message)

                   .setPositiveButton("肯定", null)

                   .setCancelable(false)

                   .create()

                   .show();

                   result.confirm();

                   return true;

         }

当用WebView访问一个网页，带有javascript的alert提示时，出现的效果

(二) 重载onJsConfirm方法实现js的confirm

         public boolean onJsConfirm(WebView view, String url, String message, final JsResult result) {

                   final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());

                   builder.setTitle("OA确认信息")

                   .setMessage(message)

                   .setPositiveButton("肯定", new OnClickListener() {

                            public void onClick(DialogInterface dialog, int which) {

                                     result.confirm();

                            }

                   }).setNeutralButton("取消", new OnClickListener() {

                            public void onClick(DialogInterface dialog, int which) {

                                     result.cancel();

                            }

                   })

                   .create()

                   .show();

                   return true;

         }

 

(三) 重载onCreateWindow方法实现js的window.open

         public WebView newWebView = null;

        

         @Override

         public boolean onCreateWindow(WebView view, boolean dialog, boolean userGesture, Message resultMsg) {

                   newWebView = new WebView(view.getContext());

                   view.addView(newWebView);

             WebSettings settings = newWebView.getSettings();

             settings.setJavaScriptEnabled(true);

                   //这个setWebViewClient要加上，不然window.open弹出浏览器打开。

             newWebView.setWebViewClient(new WebViewClient());

             newWebView.setWebChromeClient(this);

 

             WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;

             transport.setWebView(newWebView);

             resultMsg.sendToTarget();

 

             return true;

         }       

 

(三) 重载onCloseWindow方法实现js的window.close

         public void onCloseWindow(WebView view) {

                   if (newWebView != null) {

                            newWebView.setVisibility(View.GONE);

                            view.removeView(newWebView);

                   }

         }

 

（四）修改MainActivity的onCreateView

         WebSettings setting = webView1.getSettings();

         setting.setJavaScriptEnabled(true);

        

         //没有setSupportMultipleWindows的话window.open不会增长新窗口

         setting.setSupportMultipleWindows(true);   

         //没有setWebViewClient的话点链接会采用浏览器打开

         webView1.setWebViewClient(new WebViewClient());

         webView1.setWebChromeClient(new MyWebChromeClient());

         webView1.loadUrl(sUrl);