我用决心的onSaveInstanceState 和 onRestoreInstanceState 在活动，以保持选定的选项卡并修改 onTabSelected 如下：

最后修改避免了Android的重建片段不destoy。不过，我不明白为什么活动是由旋转事件被销毁，而当前片段没有。 （你有没有关于这方面的一些想法？）

 公共无效onTabSelected（TAB键，FragmentTransaction英尺）{
        // previous片段管理
        片段prevFragment;
        FragmentManager FM = mActivity.getFragmentManager（）;
        prevFragment = fm.findFragmentByTag（MTAG）;
        如果（prevFragment！= NULL）{
            mFragment = prevFragment;
        } // \ previous片段管理

        //检查片段已初始化
        如果（mFragment == NULL）{
            //如果没有，实例化并把它添加到活动
            mFragment = Fragment.instantiate（mActivity，mClass.getName（））;
            ft.add（android.R.id.content，mFragment，MTAG）;
        } 其他 {
            //如果它存在，只需将它为了显示它
            ft.attach（mFragment）;
        }
    }
 

I've made a simple Android Activity with an ActionBar to switch between 2 fragments. It's all ok until I rotate the device. In facts, when I rotate I've got 2 fragment one over the other: the previous active one and the first one. Why? If the rotation destroy and recreate my activity, why I obtain 2 fragments?

Sample code:

Activity

package rb.rfrag.namespace;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.os.Bundle;

    public class RFragActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Notice that setContentView() is not used, because we use the root
        // android.R.id.content as the container for each fragment

     // setup action bar for tabs
        final ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        //actionBar.setDisplayShowTitleEnabled(false);

        Tab tab;
        tab = actionBar.newTab()
                .setText(R.string.VarsTab)
                .setTabListener(new TabListener<VarValues>(
                        this, "VarValues", VarValues.class));
        actionBar.addTab(tab);

        tab = actionBar.newTab()
                .setText(R.string.SecTab)
                .setTabListener(new TabListener<SecFrag>(
                        this, "SecFrag", SecFrag.class));
        actionBar.addTab(tab);
    }
}

TabListener

package rb.rfrag.namespace;

import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.app.ActionBar.Tab;

public class TabListener<T extends Fragment> implements ActionBar.TabListener {
    private Fragment mFragment;
    private final Activity mActivity;
    private final String mTag;
    private final Class<T> mClass;

    /** Constructor used each time a new tab is created.
      * @param activity  The host Activity, used to instantiate the fragment
      * @param tag  The identifier tag for the fragment
      * @param clz  The fragment's Class, used to instantiate the fragment
      */
    public TabListener(Activity activity, String tag, Class<T> clz) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
    }

    /* The following are each of the ActionBar.TabListener callbacks */

    public void onTabSelected(Tab tab, FragmentTransaction ft) {    
        // Check if the fragment is already initialized
        if (mFragment == null) {
            // If not, instantiate and add it to the activity
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            // If it exists, simply attach it in order to show it
            ft.attach(mFragment);
        }
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        if (mFragment != null) {
            // Detach the fragment, because another one is being attached
            ft.detach(mFragment);
        }
    }
}

I've resolved using onSaveInstanceState and onRestoreInstanceState in the Activity to maintain the selected tab and modifying onTabSelected as follows.

The last modify avoids that Android rebuild the Fragment it doesn't destoy. However I don't understand why the Activity is destroyed by the rotation event while the current Fragment no. (Have you some idea about this?)

public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // previous Fragment management
        Fragment prevFragment;
        FragmentManager fm = mActivity.getFragmentManager();
        prevFragment = fm.findFragmentByTag(mTag); 
        if (prevFragment != null) { 
            mFragment = prevFragment; 
        } // \previous Fragment management

        // Check if the fragment is already initialized
        if (mFragment == null) {
            // If not, instantiate and add it to the activity
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            // If it exists, simply attach it in order to show it
            ft.attach(mFragment);
        }
    }