Android - Find out active fragment from CustomListAdapter?

Good day everyone, I have an Activity that hosts 4 Fragments with a PagerAdapter. In 2 of those fragments, I use a Custom ListView Adapter to show data (a row consists of a checkbox and a textview). The user can then either send or delete the selected rows (marked by the checkbox) using buttons on the fragment itself. Now, in my Custom ListView Adapter, I note down whenever the check status of the checkbox changes as such:

(Note: This happens on the getView function)

holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        Log.e(TAG, "onCheck changed at position = " + position + " , boolean = " + isChecked);
        Log.e(TAG, "context = " + context);
        android.support.v4.app.Fragment fragment = getVisibleFragment();
        String fragmentName = fragment.getClass().getSimpleName();

        Log.e(TAG, "fragmentName = " + fragmentName);

        if(fragmentName.equals("RecordsSent")) {
            RecordsSent rsFragment = (RecordsSent) fragment;

            Log.e(TAG, "null check on fm = " + fragment);
            Log.e(TAG, "null check on rsFragment = " + rsFragment);

            if(rsFragment != null)
                rsFragment.updateCheckBox(position, isChecked);
        }
        else{
            RecordsPending rpFragment = (RecordsPending) fragment;

            if(rpFragment != null)
                rpFragment.updateCheckBox(position, isChecked);
        }
    }
});

What the code basically does is to determine which fragment is visible by using the getVisibleFragment() function. After that, based on which ever fragment was detected, I call that fragment up and then fire a function within that fragment and mark which checkbox just got checked/unchecked.

This was working really well for quite some time until the time I added the 4th Fragment. Suddenly, I was getting a class cast error inside my if-else block. Upon examining the log statements, it seemed that I was getting the other fragment as the visible one. This means that the fragmentName variable would be RecordsSent if RecordsPending was visible and vice versa. I don't know how or why that happened.

Sure I can just "reverse" the logic and put an ! in my if statement BUT the null checks would return true and my function inside the fragments WON'T get called at all.

I don't think there was something wrong with how I added my fragments.

Here is the code I used to make the fragments:

TextView tv1 = createTab("Sent", new ColorDrawable(Color.parseColor("#006633")));
TextView tv2 = createTab("Pending", new ColorDrawable(Color.parseColor("#CCCC00")));
TextView tv3 = createTab("Daily Sales Report", new ColorDrawable(Color.parseColor("#F7C05F")));
TextView tv4 = createTab("News Records", new ColorDrawable(Color.parseColor("#B72153")));

tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setCustomView(tv1).setTag("Sent"));
tabLayout.addTab(tabLayout.newTab().setCustomView(tv2).setTag("Pending"));
tabLayout.addTab(tabLayout.newTab().setCustomView(tv3).setTag("Sales"));
tabLayout.addTab(tabLayout.newTab().setCustomView(tv4).setTag("News"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

//more code here

viewPager = (ViewPager) findViewById(R.id.pager);
adapter = new PagerAdapter (getSupportFragmentManager(), tabLayout.getTabCount());
Log.e(TAG, "tab count = " + tabLayout.getTabCount());
viewPager.setAdapter(adapter);

viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }
});

And then my PagerAdapter class looks like this:

public class PagerAdapter extends FragmentStatePagerAdapter {
    int mNumOfTabs;

    public PagerAdapter(FragmentManager fm, int NumOfTabs) {
        super(fm);
        this.mNumOfTabs = NumOfTabs;
    }

    @Override
    public Fragment getItem(int position) {

        switch (position) {
            case 0:
                RecordsSent tab1 = new RecordsSent();
                return tab1;
            case 1:
                RecordsPending tab2 = new RecordsPending();
                return tab2;
            case 2:
                RecordsSales tab3 = new RecordsSales();
                return tab3;
            case 3:
                RecordsNews tab4 = new RecordsNews();
                return tab4;
            default:
                return null;
        }
    }

    @Override
    public int getCount() {
        return mNumOfTabs;
    }
}

Now I'm not quite sure how or why I'm getting the wrong visible fragment. As I mentioned before, this code was working well and I don't know how to go around this. If anyone has a their way of checking which fragment is visible, I'd be very grateful.

Any help will be very much appreciated. Thanks in advanced.