一次FragmentActivity 横竖屏切换Fragment残留问题

现在正在做一个强制横屏的应用，用到了Fragment，为了兼容2.3，用的FragmentActivity。在AndroidManifest里面配置activity：android:configChanges="keyboard|keyboardHidden|orientation"

执行「锁屏 -> 转为竖屏-> 解锁」操作后，底下会出现一堆按竖屏ScreenSize布局的Fragment。

在onCreate()、onConfigurationChanged()等方法中加Log，依旧执行「锁屏 -> 转为竖屏-> 解锁」操作，得出Log如下：

11-28 10:21:32.707: I/AAA(21575): onCreate() land
11-28 10:21:33.018: I/AAA(21575): onResume() land
--------------------锁屏--------------------
11-28 10:21:39.694: I/AAA(21575): onPause() land
11-28 10:21:39.714: I/AAA(21575): onSaveInstanceState() land
-------------------转为竖屏------------------
11-28 10:22:05.930: I/AAA(21575): onDestroy() port
11-28 10:22:06.010: I/AAA(21575): onCreate() port
11-28 10:22:06.290: I/AAA(21575): onRestoreInstanceState() port
11-28 10:22:06.290: I/AAA(21575): onResume() port
11-28 10:22:06.300: I/AAA(21575): onPause() port
--------------------解屏--------------------
11-28 10:22:29.222: I/AAA(21575): onResume() port
11-28 10:22:29.403: I/AAA(21575): onPause() land
11-28 10:22:29.403: I/AAA(21575): onSaveInstanceState() land
11-28 10:22:29.413: I/AAA(21575): onDestroy() land
11-28 10:22:29.443: I/AAA(21575): onCreate() land
11-28 10:22:29.713: I/AAA(21575): onRestoreInstanceState() land
11-28 10:22:29.713: I/AAA(21575): onResume() land

根据Log猜测Fragment残留的原因是因为转为竖屏解锁过程中activity销毁重建了，同时Fragment是add()进去的，onSaveInstanceState()、onRestoreInstanceState()保存了之前的东西。

但是onConfigurationChanged()并没有被调用，百思不得其解，于是Google一下，终于发现这篇文章《android4.0 屏幕切换（避免重走Activity的生命周期）》。原来3.0以上系统要在android:configChanges中配置“screenSize” ——android:configChanges="orientation|screenSize“。

试了下，问题解决，Log如下：

11-28 11:47:07.857: I/AAA(24724): onCreate() land
11-28 11:47:08.167: I/AAA(24724): onResume() land
--------------------锁屏--------------------
11-28 11:47:22.652: I/AAA(24724): onPause() land
11-28 11:47:22.672: I/AAA(24724): onSaveInstanceState() land
-------------------转为竖屏------------------
11-28 11:47:29.718: I/AAA(24724): onConfigurationChanged() port
--------------------解屏--------------------
11-28 11:47:45.794: I/AAA(24724): onResume() port
11-28 11:47:45.864: I/AAA(24724): onConfigurationChanged() land