爲什麼每次啓動使用支持碎片的活動時都會收到IllegalStateException？

我使用Android支持庫在預蜂巢應用程序中使用片段。爲什麼每次啓動使用支持碎片的活動時都會收到IllegalStateException？

如果我在我的活動的onCreate方法內添加一個片段，則該活動將與IllegalStateException異常。

08-04 10:19:49.100: ERROR/AndroidRuntime(18501): FATAL EXCEPTION: main 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501): java.lang.RuntimeException: Unable to start activity ComponentInfo{net..../net.....homescreen...Main}: java.lang.IllegalStateException: Activity has been destroyed 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.os.Handler.dispatchMessage(Handler.java:99) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.os.Looper.loop(Looper.java:123) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.app.ActivityThread.main(ActivityThread.java:3691) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at java.lang.reflect.Method.invoke(Method.java:507) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at dalvik.system.NativeStart.main(Native Method) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501): Caused by: java.lang.IllegalStateException: Activity has been destroyed 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1257) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:535) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:519) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at net.....AbstractActivity.onCreate(AbstractActivity.java:103) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at net.....homescreen...Main.onCreate(..Main.java:51) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) 
08-04 10:19:49.100: ERROR/AndroidRuntime(18501):  ... 11 more

的AbstractActivity的OnCreate看起來是這樣的：

protected void onCreate(Bundle savedInstanceState) { 
    if (menuEnabled) { 
     FragmentManager fragmentManager = getCompatibleFragmentManager(); 
     FragmentTransaction transaction = fragmentManager 
       .beginTransaction(); 
     transaction.add(new OptionsMenuFragment(), OPTIONS_MENU_IDENTIFIER); 
     transaction.commit(); 
    } 
    super.onCreate(savedInstanceState); 
}

如果我調試呼叫我看到，由於該活動是空的fragmentmanager拋出該異常。看起來fragmentmanager根本沒有初始化。

我在做什麼錯？

來源

2011-08-04 Janusz

事實證明，來自兼容包的FragmentActivity會在onCreate方法本身中初始化片段管理器。

如果我將調用超級移動到我的onCreate方法的開始，一切正常。

來源

2011-08-04 08:33:56 Janusz

不錯，謝謝。 – nobre

我也使用Fragments從兼容庫中獲取IllegalStateException ...但它與此無關，我對super的調用已經在onCreate的開始處（也在超類中） – Ixx

不錯，剛回來時遇到了同樣的問題並且感到困惑我無法贊成...似乎我不是一個快速的學習者。 – Janusz

爲什麼每次啓動使用支持碎片的活動時都會收到IllegalStateException？

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