android fragment的问题

要实现如图所示效果。
遇到如下问题：
进入后首先默认选择ActionBar上的顾客管理Tab，点击店员管理Tab后正常显示（内容和顾客管理样式一样），再点击顾客管理Tab报错退出。
现在知道原因是由于顾客管理Tab的ListFragment有关。是因为虽然删除了顾客管理Tab的Fragment但是，Fragment还有一个子ListFragment没有被删除，第二次加载因为重复报错。
文件结构如下
                  MainActivity
      CustomerFragment      ClerkFragment
ListFragment                         ListFragment
报错如下

06-27 23:09:33.443: E/AndroidRuntime(14181): FATAL EXCEPTION: main

06-27 23:09:33.443: E/AndroidRuntime(14181): android.view.InflateException: Binary XML file line #6: Error inflating class fragment

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:489)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:396)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:352)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at store.mgr.root.customer.CustomerMainFragment.onCreateView(CustomerMainFragment.java:25)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:829)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.app.BackStackRecord.run(BackStackRecord.java:639)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.os.Handler.handleCallback(Handler.java:615)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.os.Handler.dispatchMessage(Handler.java:92)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.os.Looper.loop(Looper.java:137)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.app.ActivityThread.main(ActivityThread.java:4823)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at java.lang.reflect.Method.invokeNative(Native Method)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at java.lang.reflect.Method.invoke(Method.java:511)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at dalvik.system.NativeStart.main(Native Method)

06-27 23:09:33.443: E/AndroidRuntime(14181): Caused by: java.lang.IllegalArgumentException: Binary XML file line #6: Duplicate id 0x7f0a000a, tag null, or parent id 0xffffffff with another fragment for store.mgr.root.customer.CustomerTitlesFragment

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.app.Activity.onCreateView(Activity.java:4669)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)

06-27 23:09:33.443: E/AndroidRuntime(14181): 	... 19 more

06-27 23:09:34.734: I/Process(14181): Sending signal. PID: 14181 SIG: 9

代码如下
MainActivity.java

package store.mgr.root;





import store.mgr.root.R;

import store.mgr.root.R.layout;

import store.mgr.root.R.menu;

import store.mgr.root.R.string;

import store.mgr.root.clerk.ClerkMainFragment;

import store.mgr.root.customer.CustomerMainFragment;

import store.mgr.root.customer.CustomerTitlesFragment;

import android.app.ActionBar;

import android.app.ActionBar.Tab;

import android.app.ActionBar.TabListener;

import android.app.Activity;

import android.app.Dialog;

import android.app.Fragment;

import android.app.FragmentTransaction;

import android.content.Context;

import android.os.Bundle;



import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentTabHost;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.view.Window;

import android.widget.ArrayAdapter;

import android.widget.FrameLayout;

import android.widget.ListView;

import android.widget.ToggleButton;



/**

 * This demonstrates how you can implement switching between the tabs of a

 * TabHost through fragments, using FragmentTabHost.

 */

public class MainActivity extends Activity {



	@Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // setup Action Bar for tabs

        final ActionBar actionBar = getActionBar();

        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // remove the activity title to make space for tabs

        actionBar.setDisplayShowTitleEnabled(false);

        // instantiate fragment for the tab



        actionBar.addTab(actionBar.newTab().setText(R.string.customer_mgr)

                .setTabListener(new StoreTabListener(new CustomerMainFragment())));

        actionBar.addTab(actionBar.newTab().setText(R.string.clerk_mgr)

                .setTabListener(new StoreTabListener(new ClerkMainFragment())));

        



    }

    @Override

	public boolean onCreateOptionsMenu(Menu menu) {

		super.onCreateOptionsMenu(menu);

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}

  

    private class StoreTabListener implements ActionBar.TabListener{

    	private Fragment fragment;

    	

    	



		public StoreTabListener(Fragment fragment) {

			super();

			this.fragment = fragment;

			// TODO Auto-generated constructor stub

		}



		@Override

		public void onTabReselected(Tab tab, FragmentTransaction ft) {

			// TODO Auto-generated method stub

			

		}



		@Override

		public void onTabSelected(Tab tab, FragmentTransaction ft) {

			// TODO Auto-generated method stub

	        ft.add(R.id.customer_clerk, fragment);

	        //ft.commit();

		}



		@Override

		public void onTabUnselected(Tab tab, FragmentTransaction ft) {

			// TODO Auto-generated method stub

			ft.remove(fragment);

			//ft.commit();

		}

    	

    }



}

MainActivity.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:baselineAligned="false"

    android:orientation="horizontal"

    android:layout_width="match_parent" android:layout_height="match_parent">



    <FrameLayout android:id="@+id/customer_clerk" android:layout_weight="1"

            android:layout_width="0px" android:layout_height="match_parent"

            android:background="?android:attr/detailsElementBackground" />



</LinearLayout>

CustomerMainFragment.java

package store.mgr.root.customer;





import store.mgr.root.R;

import android.app.Fragment;

import android.app.FragmentTransaction;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import android.widget.LinearLayout.LayoutParams;



/**

 * This demonstrates how you can implement switching between the tabs of a

 * TabHost through fragments, using FragmentTabHost.

 */

public class CustomerMainFragment extends Fragment {



	@Override

	public View onCreateView(LayoutInflater inflater, ViewGroup container,

			Bundle savedInstanceState) {

		

		View layout = inflater.inflate(R.layout.activity_main_customer, null);



		return layout;

	}





	

}

customer_main_customer.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:baselineAligned="false"

    android:orientation="horizontal"

    android:layout_width="match_parent" android:layout_height="match_parent">



    <fragment android:name="store.mgr.root.customer.CustomerTitlesFragment"

            android:id="@+id/customer_titles" android:layout_weight="1"

            android:layout_width="0px" android:layout_height="match_parent" />

        

    <FrameLayout android:id="@+id/customer_details" android:layout_weight="1"

            android:layout_width="800dp" android:layout_height="match_parent"

            android:background="?android:attr/detailsElementBackground" />



</LinearLayout>

CustomerTitleFragment.java

package store.mgr.root.customer;



import android.app.ListFragment;

import android.os.Bundle;



import android.widget.ArrayAdapter;



public class CustomerTitlesFragment extends ListFragment {







	@Override

	public void onActivityCreated(Bundle savedInstanceState) {

		// TODO Auto-generated method stub

		super.onActivityCreated(savedInstanceState);

		String titles[] = new String[]{"dogs","cats","horses"};

		setListAdapter(new ArrayAdapter<String>(getActivity(),

                android.R.layout.simple_list_item_activated_1, titles));

	}

	

	



	



}

clerk和Customer一样，只是内容不同 Android Fragment ListFragment ActionBar --------------------编程问答-------------------- 顶一下快点帮帮忙吧 --------------------编程问答-------------------- 赶紧的你们干嘛呢这是 --------------------编程问答-------------------- 再顶一下这个要怎么去做 --------------------编程问答--------------------
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
                            if(getFragmentManager().findFragmentByTag("clerk")==null)
                            {
                            ft.add(R.id.customer_clerk, fragment,"clerk");
                            }
                            ft.attach(fragment);

        }

        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            if (fragment != null) {
                ft.detach(fragment);
            }
        }

补充：移动开发 ,  Android