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我有一个漂亮的 ViewPager/FragmentStatePagerAdapter 在我的应用程序上工作，但是在手动将 Fragment 添加到 FragmentManager 之后，我在旋转屏幕 TWICE 时开始收到此异常。

堆栈跟踪：

07-29 19:10:22.360: E/FragmentManager(712): Fragement no longer exists for key f0: index 1
07-29 19:10:22.360: E/FragmentManager(712): Activity state:
07-29 19:10:22.407: D/FragmentManager(712):   Active Fragments in 4608be98:
07-29 19:10:22.410: D/FragmentManager(712):     #0: RESTFragment{46005fb0 #0 RESTFragment}
07-29 19:10:22.410: D/FragmentManager(712):       mFragmentId=#0 mContainerId=#0 mTag=RESTFragment
07-29 19:10:22.410: D/FragmentManager(712):       mState=5 mIndex=0 mWho=android:fragment:0 mBackStackNesting=0
07-29 19:10:22.410: D/FragmentManager(712):       mAdded=true mRemoving=false mResumed=true mFromLayout=false mInLayout=false
07-29 19:10:22.410: D/FragmentManager(712):       mHidden=false mDetached=false mMenuVisible=true mHasMenu=false
07-29 19:10:22.419: D/FragmentManager(712):       mRetainInstance=true mRetaining=false mUserVisibleHint=true
07-29 19:10:22.419: D/FragmentManager(712):       mFragmentManager=FragmentManager{45fbe180 in MyActivity{46016180}}
07-29 19:10:22.419: D/FragmentManager(712):       mActivity=com.argeniss.theguymob.frontend.MyActivity@46016180
07-29 19:10:22.419: D/FragmentManager(712):     #1: null
07-29 19:10:22.419: D/FragmentManager(712):   Added Fragments:
07-29 19:10:22.419: D/FragmentManager(712):     #0: RESTFragment{46005fb0 #0 RESTFragment}
07-29 19:10:22.419: D/FragmentManager(712):     #1: MyPageFragment{46024658}
07-29 19:10:22.419: D/FragmentManager(712):   FragmentManager misc state:
07-29 19:10:22.419: D/FragmentManager(712):     mActivity=null
07-29 19:10:22.419: D/FragmentManager(712):     mContainer=null
07-29 19:10:22.430: D/FragmentManager(712):     mCurState=0 mStateSaved=true mDestroyed=true
07-29 19:10:22.430: D/FragmentManager(712):     mAvailIndices: [1]
07-29 19:10:22.430: E/com.argeniss.theguymob.frontend.MyActivity(712): Fragement no longer exists for key f0: index 1

这是我手动将片段添加到管理器的代码：

private void addFragmentToManager() {
    String fragmentTag = RESTFragment.TAG;
    FragmentManager fragmentManager = getSupportFragmentManager();

    restFragment = (RESTFragment) fragmentManager.findFragmentByTag(fragmentTag);
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

    if (restFragment == null) {
        restFragment = new RESTFragment();
        fragmentTransaction.add(restFragment, fragmentTag);
    }

    // Adds the transaction to the fragment manager.
    fragmentTransaction.commit();
    fragmentManager.executePendingTransactions();
}
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