Changing centre background color ?

My problem is about to change centre button's background color. When i click centre button, i'm changing it's icon but background color is not changing. How can i do this ?
Here is my code:

public void onCentreButtonClick(){
fragmentManager = getSupportFragmentManager();
if(isCentre){ //centre button is clicked or not.
isCentre = false;
bottom_nav.changeCenterButtonIcon(R.mipmap.p);
//Open some fragment
}
else {
isCentre = true;
bottom_nav.changeCenterButtonIcon(R.mipmap.p_active);
//Open centre fragment
}
final FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.container, fragment).commit();
}

And here is my bottom_nav configurations:

bottom_nav.setCentreButtonIconColorFilterEnabled(false);
bottom_nav.setCentreButtonIcon(R.mipmap.p);
bottom_nav.setCentreButtonColor(ContextCompat.getColor(context, R.color.bottom_nav_back));

bottom_nav.setInActiveSpaceItemColor(ContextCompat.getColor(context, R.color.bottom_nav_items));
bottom_nav.setActiveSpaceItemColor(ContextCompat.getColor(context, R.color.bottom_nav_items));
bottom_nav.setSpaceBackgroundColor(ContextCompat.getColor(context, R.color.bottom_nav_back));

Start by tracing the library methods setCentreButtonColor and changeCentreButtonIcon from the provided configuration and click handler. Reproduce the click behavior, then inspect how the centre button background is applied; the issue is done when changing the centre icon also visibly changes its background color.

Written by the indexing model from the issue text.