Multiple Styles.xml files in Android Application

I was wondering if you could have multiple styles.xml files in your android application, so that when you want to switch to a custom theme you can just change to a different styles.xml file. The reason I want multiple files is because I want to change the style of individual widgets and be able to change the theme dynamically at runtime.

Basically I need something like this:

//User clicks a different theme from an options menu
switch (item.getItemId())
{
    case R.id.Theme1:
        changeStyleFile(styles1.xml);
        break;
    case R.id.Theme2:
        changeStyleFile(styles2.xml);
        break;
}