Is it possible to open a javascript popup window on a android webviewer coded like this example from google? and if yes how? I dont want that the original page in the background is closed it has to be a popup like on the picture.

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JavaScript alert not working in Android WebView
The answer from Stephen Quan is to just set the default webChromeClient
mWebView.setWebChromeClient(new WebChromeClient());
klifa
You can allow javascript and opening windows from javascript in a webview. Just set this settings
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
Be careful though because enabling javascript on your app webview can bring some serious security issues
check this links
and this one for webviews
来源:https://stackoverflow.com/questions/21354551/how-to-display-javascript-popup-in-android-webview