我們知道，Andorid旋轉屏幕時默認是重新Create Activity，之前我們可以
在AndroidManifest.xml 中添加activity屬性android:configChanges="orientation"
來聲明Acitivity自己處理orientaion，這樣就不會重新Create Activity
在 ics中需要改為android:configChanges="orientation|screenSize"
Caution: Beginning with Android 3.2 (API level 13), the "screen size" also changes when the device switches between portrait and landscape orientation. Thus, if you want to prevent runtime restarts due to orientation change when developing for API level 13 or higher (as declared by the minSdkVersion and targetSdkVersion attributes), you must include the "screenSize" value in addition to the "orientation" value. That is, you must decalare android:configChanges="orientation|screenSize". However, if your application targets API level 12 or lower, then your activity always handles this configuration change itself (this configuration change does not restart your activity, even when running on an Android 3.2 or higher device).