OnOptionsItemSelected not called when button is clicked in action bar - Android

When I click the back button of my action bar, the onOptionsItemSelected method of my fragment has never been called. I want to go to the previous snippet when I clicked the button, but it never calls this method. This is the code for the snippet, what could this be the problem?

public class MyFragment extends Fragment {


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ((ActionBarActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    ((ActionBarActivity)getActivity()).getSupportActionBar().setDisplayShowHomeEnabled(true);

    setHasOptionsMenu(true);

}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    // Get item selected and deal with it
    switch (item.getItemId()) {
        case android.R.id.home:
            //called when the up affordance/carat in actionbar is pressed
            getActivity().onBackPressed();
            return true;
    }
    return false;
}

      

        
        
        
      

    

Thanks in advance.