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I have an activity where a layout is included and button on included layout is invisible. Code for that is defined below.

 <include android:id="@+id/count_down_strip" layout="@layout/countdown_timer_header"
 android:layout_height="60dp"
 android:layout_width="match_parent"
 android:layout_marginTop="?attr/actionBarSize"
 />

The content of countdown_timer_header is

 <?xml version="1.0" encoding="utf-8"?>

<View android:background="#73ffffff" android:layout_width="1.0dip" android:layout_height="fill_parent" />

<TextView android:textColor="#ffffff" android:gravity="center"
 android:layout_gravity="center" android:id="@+id/timer"
 android:layout_width="0.0dip" android:layout_height="wrap_content"
 android:text="00:00" android:layout_weight="1.0"
 style="@style/text_h4" />

<View android:background="#73ffffff" android:layout_width="1.0dip" android:layout_height="fill_parent" />


<TextView android:textColor="#ffffff" android:gravity="center" android:layout_gravity="center" android:id="@+id/finish"
 android:layout_width="0.0dip"
 android:visibility="invisible"
 android:layout_height="fill_parent" android:text="Submit" android:layout_weight="1.0" style="@style/text_h4" />

The textview finish is invisible and we have to make it visible once the viewpager is swiped to last page.The activity has two fragments and in parent fragment a viewpager is defined .

I want to find the view of this textview in parent fragment so that i can change the visibility.

 private void getIDs(View view) 
 viewPager = (ViewPager) view.findViewById(R.id.my_viewpager);
 adapter = new ViewPagerAdapter(getFragmentManager());
 viewPager.setAdapter(adapter);
 viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() 
 Boolean first = true;
 @Override
 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) 
 if (!first && positionOffset == 0 && positionOffsetPixels == 0)
 onPageSelected(0);
 first = false;
 
 
 @Override
 public void onPageSelected(int position) 
 pageno=viewPager.getCurrentItem();
 //Check if the viewpager has last page loaded
 if (pageno == adapter.getCount()-1)
 System.out.println("page no. is"+pageno);
 bbb.setvisibility(View.VISIBLE);

 

 

 @Override
 public void onPageScrollStateChanged(int i) 
 
 );

How can i achieve this.
I tried doing this but of no beniefit.

 View vv((TestQuestion)getActivity()).findViewById(R.id.count_down_strip);
 bbb=vv.findViewById(R.id.finish);