how to get a fragment added in an XML layout

Question

I have a layout which includes a fragment as follows:

Answer 1

You can find the fragment using findFragmentById (if you know the component it is included in) or by findFragmentByTag (if you know its tag)

I don't know which variables you want to update, but you can replace the fragment with another fragment using the FragmentTransaction API.

See http://developer.android.com/guide/components/fragments.html for examples.