片段之间的事务仅在一个ActionBar选项卡内

我有一个带有三个选项卡（ActionBar选项卡）的应用程序，每个选项卡一次只有一个片段 .

TabListener

TabsActivity

Tab1 - > ListFragment1 - > ListFragment2 - > Fragment3

Tab2 - > Tab2Fragment

Tab3 - > Tab3Fragment

问题是当我从ListFragment1到ListFragment2创建FragmentTransaction（在OnListItemClicked内）时，其他选项卡中的片段也会更改为ListFragment2 .

最后，我想仅在选项卡内更改片段并保留其他选项卡的状态 .

我已经保存了状态（OnSavedInstance（）） . 你知道我在这里缺少什么吗？

一些代码：

public class TabsActivity extends Activity {

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

        // setup Action Bar for tabs
        ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // instantiate fragment for the tab
        Fragment networksFragment = new NetworksFragment();
        // add a new tab and set its title text and tab listener
        actionBar.addTab(actionBar.newTab().setText("Tab1")
                .setTabListener(new TabsListener(ListFragment1)));

        // instantiate fragment for the tab
        Fragment historyFragment = new HistoryFragment();
        // add a new tab and set its title text and tab listener
        actionBar.addTab(actionBar.newTab().setText("Tab2")
                .setTabListener(new TabsListener(Tab2Fragment)));

        // instantiate fragment for the tab
        Fragment settingsFragment = new SettingsFragment();
        // add a new tab and set its title text and tab listener
        actionBar.addTab(actionBar.newTab().setText("Tab3")
                .setTabListener(new TabsListener(Tab3Fragment)));
    }
}

public class TabsListener implements ActionBar.TabListener {

    private Fragment frag;


    // Called to create an instance of the listener when adding a new tab
    public TabsListener(Fragment networksFragment) {
        frag = networksFragment;
    }

    @Override
    public void onTabReselected(Tab arg0, FragmentTransaction arg1) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {    
        ft.add(R.id.fragment_container, frag, null);
    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        ft.remove(frag);        
    }
}

public class ListFragment1 extends ListFragment {

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {

        getListView().setItemChecked(position, true);

        ListFragment2 fragment2 = ListFragment2.newInstance(position);

        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.replace(R.id.fragment_container, fragment2);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        ft.addToBackStack(null);
        ft.commit();
    }
}