Can I combine PHP and Javascript code into a single Android app?

I want to create an Android app with a jQuery based GUI that gets information for display as json data from a PHP script, which in turn gets the data from a local SQL database. The app should be able to run offline with an integrated database, i.e. the user should not have to install a separate server process for the database. The user shuld be able to download the app from the app store as a single installation.

I'm new to app development - is this possible at all? If so, what do I need to get started? If not, what might be an alternative approach for an app that must access an offline database?