Possible Duplicate:
What does Layout Inflater in Android do?
What is the layout inflater used for in an Android application?
Possible Duplicate:
What does Layout Inflater in Android do?
What is the layout inflater used for in an Android application?
LayoutInflater is used instantiate XMLs that create Views. This involves parsing the XML, creating the View object, and finally adding it to the View hierarchy.
Check out the Android API for more information about it.