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Force collapse of tabs in ActionBar
public class AdminActivity extends SherlockFragmentActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_admin);

    ActionBar actionBar = getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    ActionBar.Tab itemsTab = actionBar.newTab().setText(R.string.label_tab_items);
    ActionBar.Tab usersTab = actionBar.newTab().setText(R.string.label_tab_users);

    actionBar.addTab(itemsTab);
    actionBar.addTab(usersTab);
}