Call to getLayoutInflater() in places not in activity

You can use this outside activities – all you need is to provide a Context:

LayoutInflater inflater = (LayoutInflater) context.getSystemService( Context.LAYOUT_INFLATER_SERVICE );

Then to retrieve your different widgets, you inflate a layout:

View view = inflater.inflate( R.layout.myNewInflatedLayout, null );
Button myButton = (Button) view.findViewById( R.id.myButton );

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EDIT as of July 2014

Davide’s answer on how to get the LayoutInflater is actually more correct than mine (which is still valid though).