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I have implemented fragment in viewpager and Fragment has some buttons. Also viewpager is in activity_main layout.

I want that when button is clicked then it implement a method which is mentioned in mainActivity.java.

How can I do this?

I am a beginner.

You can get MainActivity method from fragment like below. Make sure your methid is public if MainActivity and ViewPager are not in same package.

((MainActivity) getActivity()).getMethodOfMain();
You can call getActivity Method from your fragment and cast it to the your respective Activity. 
lets take an example : You Have MainActivity class
MainActivity { 
public void check() {}
And you have fragment : MainFragment 
MainFragment{ 
Activity mainActivity  = (MainActivity) getActivity();
mainActivity.check();
Thats how you can call the Respective Activity Method.
        
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