android fragment的问题

Question

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AndroidFragmentListFragmentActionBar

Answer 1

        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);
            }
        }