android - Use view pager from embedded fragment to change spinner in parent activity? -

i'm having bit of trouble communication between parentactivity , child fragment.

i using actionbarsherlock.

i have looked around on so, haven't found deals viewpagers , spinners yet.

background:

my child fragment has own action bar specifying couple of action items not available in other fragments, 1 of these action items spinner multiple options - a, b , c etc

by default mainactivity load fragment_a(child fragment) contains viewpager.

this view pager handles swipes between views , b(spinner has options a,b, c etc)

fragment_a has spinner adapter. if select on spinner, viewpager switches a, if select b on spinner, viewpager switches b. (this works fine).

my question is: how capture when user "swipes" between , b(they don't use spinner) , change "spinner" or b respectively?

note: pager adapter(for viewpager) created separately in different class.

any appreciated...thank all!

this need. you'll have set interface in fragment , implement interface in parent activity. in fragment instantiate instance of interface , in whatever method use listen page changes, call method communicate data activity.

it seems kinda "hand-wavy" hope clears little.