我使用
Android支持库在precombcomb应用程序中使用片段.
如果我在活动的onCreate方法中添加一个片段,则活动会因IllegalStateException而崩溃.
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
AbstractActivity的onCreate看起来像这样:
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); }
如果我调试调用,我会看到fragmentmanager抛出此异常,因为activity是null.似乎片段管理器根本没有初始化.
我究竟做错了什么?
解决方法
事实证明兼容包中的FragmentActivity在onCreate方法本身中初始化片段管理器.
如果我将调用super移动到onCreate方法的开头,一切正常.
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