java - Call notifyDataSetChanged() within Fragment -


i'm using viewpager in mainactivity.java 5 fragments.

now i've got problem.

running notifydatasetchanged() works fine this:

viewpager.getadapter().notifydatasetchanged();

but how can run notifydatasetchanged() fragment?

i have no idea.

what i've tried

making viewpager static , run 

 mainactivity.this.viewpager.getadapter().notifydatasetchanged()

doesn't work.

add method mainactivity 

public void datachanged() {   viewpager.getadapter().notifydatasetchanged(); }

and fragments call with

((mainactivity) getactivity()).datachanged();

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