javascript - 在 Android 浏览器中捕获浏览器关闭事件

Question

如何在 Android 浏览器中捕获浏览器关闭或更具体的页面卸载事件？我无法通过 unload、beforeunload 等事件使其在 Android 浏览器中运行。

Answer 1

    /* Tell the client to display a dialog to confirm navigation away from
 the current page. This is the result of the onbeforeunload javascript event.
 If the client returns true, WebView will assume that the client will handle
 the confirm dialog and call the appropriate JsResult method. If the client
 returns false, a default value of true will be returned to javascript to accept
 navigation away from the current page. The default behavior is to return false.
 Setting the JsResult to true will navigate away from the current page, false will
 cancel the navigation.
    */
        public boolean onJsBeforeUnload (WebView view, String url, String message, JsResult result){

        }

来自 http://developer.android.com/reference/android/webkit/WebChromeClient.html

我认为您还可以将代码注入(inject)到 WebView 显示的网页中:

<script type="text/javascript">
    function OnBeforeUnLoad () {
        return "";
    }
</script>

使用

@Override  
    public void onPageFinished(WebView view, String url)  
    {  
        webview.loadUrl("string with your script");  
    }