Android – how do I listen to fragment Backstack pop only?

I want to know when the clip pops up from the background

My code is as follows

private void setupChildFragmentPopListener() {
    getChildFragmentManager().addOnBackStackChangedListener(
            new FragmentManager.OnBackStackChangedListener() {
                @Override
                public void onBackStackChanged() {
                    // Do whatever I want
                }
            });
}

However, this code is triggered when adding and pop fragments. How can I just listen to popular fragments? Or filter out its method in the onbackstackchanged () function, if it is not pop?

resolvent:

You can keep the count of Backstack entries and compare them every time you call onbackstackchanged()

private void setupChildFragmentPopListener() {
    getChildFragmentManager().addOnBackStackChangedListener(
            new FragmentManager.OnBackStackChangedListener() {
                @Override
                public void onBackStackChanged() {
                    int backCount = getChildFragmentManager().getBackStackEntryCount();
                }
            });
}