public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId()== android.R.id.home) {
            Intent intent = NavUtils.getParentActivityIntent(this);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            NavUtils.navigateUpTo(this, intent);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }