I use a WebView in my app. When the app is not connected to the internet I want to serve the site locally. I was able to build the APK and install the
Android does not ship with a PHP server. Therefore for all common intents and purposes, it is not possible to serve a .php file locally.
You would need to rewrite your offline page to function without any PHP code.
I assume the CSS you refer to is also part of the PHP include and therefore is not loading for the same reason.