I made a boilerplate template for making HTML5 apps in Android a while ago:

https://github.com/thinglet/Android-HTML5-Boilerplate

You'll have to edit a file, but the WebView can be pointed at an http link, you should be able to put the URL to your mobile site and have an app. Below is the file that needs to be edited:

https://github.com/thinglet/Android-HTML5-Boilerplate/blob/m...