AB_home_button

@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {

    switch (item.getItemId()) {
        case android.R.id.home:
            // Do something here
            break;
        case R.id.your_other_action_bar_button:
            // Do something else
            break;
    }

    return super.onMenuItemSelected(featureId, item);
}