Java for mobile devices

I've been working on a web site using php.  Now all of a sudden they want it to be on mobile phones and they want an app.

I need a good book on java or a web site to learn this in a hurry.

What is the diff between a site and an app?

Who is Participating?
It depend how your web site is architectured but take a look to cordova/phonegap
PhoneGap Intro
PhoneGap is a free and open source framework that allows you to create mobile apps using the web technologies you’re already familiar with: HTML, CSS, and JavaScript.
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