android - I am not able to find callback in first two fragments of viewpager in activity -

scenario: have 3 fragments in viewpager in activity.

fragment one

fragmenttwo

fragmentthree

i noticed switching fragment 1 3 onpause() method called when switched fragment 1 2 onpause not called

problem: want show data in fragmentone's textview webservice on button click.i clicked button , data shown noticed when switch 1 2 , come fragment 1 data shown. want hide data when come one. there callback . ?

you need understand viewpager first. viewpager creates fragment in advance before , keeps there smooth flow when switch, if on fragment 2. viewpager creates 1 , 3 , keeps.

and when on fragment 3 retains fragment 1. anyways can increase limit of viewpager this

viewpager.setoffscreenpagelimit(int num) 

you can understand lifecylce of fragment in viewpager putting logs in onpause , onresume in viewpager fragments.

anyways coming prob. need have custom interface this . answer helped me too