android webview 中alert不执行！

1.今天做一个Demo郁闷了一下午，我在Android里要调用webview页面里的一个方法，但一直没有执行（用简单的alert调试）

2.后改成其它的调试方式，改写dom元素的内容达到调试目的，发现这种方案可行，就上网上查原因，最后找到如下解释：

One should use a WebChromeClient to get these alerts and the functionality can be overwritten using the onJsAlert() method. Hope this helps!

WebView wv=new WebView(this);   
wv.setWebChromeClient(new WebChromeClient() {
    @Override
    public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
                //Required functionality here
                return super.onJsAlert(view, url, message, result);
       }

https://code.google.com/p/android/issues/detail?id=752#c12 http://q.cnblogs.com/q/47060/

坑爹，现在还没有想明白为什么webview默认会把alert的特性禁用掉呢？

http://developer.android.com/reference/android/webkit/WebView.html

A WebView has several customization points where you can add your own behavior. These are:

Creating and setting a WebChromeClient subclass. This class is called when something that might impact a browser UI happens, for instance, progress updates and JavaScript alerts are sent here (see Debugging Tasks).
Creating and setting a WebViewClient subclass. It will be called when things happen that impact the rendering of the content, eg, errors or form submissions. You can also intercept URL loading here (via shouldOverrideUrlLoading()). Modifying the WebSettings, such as enabling JavaScript with setJavaScriptEnabled().
Injecting Java objects into the WebView using the addJavascriptInterface(Object, String) method. This method allows you to inject Java objects into a page's JavaScript context, so that they can be accessed by JavaScript in the page.

Here's a more complicated example, showing error handling, settings, and progress notification:

// Let's display the progress in the activity title bar, like the
 // browser app does.
 getWindow().requestFeature(Window.FEATURE_PROGRESS);

 webview.getSettings().setJavaScriptEnabled(true);

 final Activity activity = this;
 webview.setWebChromeClient(new WebChromeClient() {
   public void onProgressChanged(WebView view, int progress) {
     // Activities and WebViews measure progress with different scales.
     // The progress meter will automatically disappear when we reach 100%
     activity.setProgress(progress * 1000);
   }
 });
 webview.setWebViewClient(new WebViewClient() {
   public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
     Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
   }
 });

 webview.loadUrl("http://developer.android.com/");

tonny-zhang / tonny-zhang.github.com

android webview 中alert不执行！ #6