try this:
View view = findViewById(...) //or however you need it
LayoutParams lp = (LayoutParams) view.getLayoutParams();
margins are accessible via
lp.leftMargin;
lp.rightMargin;
lp.topMargin;
lp.bottomMargin;
edit:
perhaps ViewGroup.MarginLayoutParams will work for you. It’s a base class for other LayoutParams.
ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) view.getLayoutParams();
http://developer.android.com/reference/android/view/ViewGroup.MarginLayoutParams.html