（1）我用的是fragment，在onStop但是沒有onDestroy的情況下切換（replace）fragment時報 java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState錯誤，出現(xiàn)問題原因，在于我使用了FragmentTransaction.commit，解決辦法：使用FragmentTransaction.commitAllowingStateLoss就不會報錯了

（2）今天使用Fragment的時候，出現(xiàn)了這個錯誤 IllegalStateException: Can not perform this action after onSaveInstanceState：

E/AndroidRuntime( 2346): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
E/AndroidRuntime( 2346):        at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1323)
E/AndroidRuntime( 2346):        at android.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1341)
E/AndroidRuntime( 2346):        at android.app.BackStackRecord.commitInternal(BackStackRecord.java:597)
E/AndroidRuntime( 2346):        at android.app.BackStackRecord.commit(BackStackRecord.java:575)

是在使用FragmentTransition的 commit方法添加一個Fragment的時候出現(xiàn)的，后來在官網(wǎng)找到了相關(guān)的

說明：http://developer.android.com/reference/android/app/FragmentTransaction.html#commitAllowingStateLoss()

public abstract int commitAllowingStateLoss ()

Added in API level 11

Like [commit()](http://developer.android.com/reference/android/app/FragmentTransaction.html#commit()) but allows the commit to be executed after an activity's state is saved. This is dangerous because the commit can be lost if the activity needs to later be restored from its state, so this should only be used for cases where it is okay for the UI state to change unexpectedly on the user.

大致意思是說我使用的 commit方法是在Activity的onSaveInstanceState()之后調(diào)用的，這樣會出錯，因為

onSaveInstanceState方法是在該Activity即將被銷毀前調(diào)用，來保存Activity數(shù)據(jù)的，如果在保存玩狀態(tài)后

再給它添加Fragment就會出錯。解決辦法就是把commit()方法替換成 commitAllowingStateLoss()就行

了，其效果是一樣的。