Activity hosting fragments with back button listeners

MyActivity.java

@Override
public void onBackPressed() {
    tellFragments();
    super.onBackPressed();
}

private void tellFragments(){
    List<Fragment> fragments = getSupportFragmentManager().getFragments();
    for(Fragment f : fragments){
        if(f != null && f instanceof BaseFragment)
            ((BaseFragment)f).onBackPressed();
    }
}