Android - 解決onSaveInstanceState的Bug
來源：程序員人生 發(fā)布時(shí)間：2015-02-02 08:43:56 閱讀次數(shù)：6280次
解決onSaveInstanceState的Bug
本文地址：http://blog.csdn.net/caroline_wendy
Bug:
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.support.v4.app.FragmentManagerImpl.checkStateLoss(Unknown Source)
at android.support.v4.app.FragmentManagerImpl.enqueueAction(Unknown Source)
at android.support.v4.app.BackStackRecord.commitInternal(Unknown Source)
at android.support.v4.app.BackStackRecord.commit(Unknown Source)
at android.support.v4.app.FragmentTabHost.onAttachedToWindow(Unknown Source)
at android.view.View.dispatchAttachedToWindow(View.java:12618)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2460)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2467)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2467)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2467)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2467)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2467)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1262)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1045)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5908)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:780)
at android.view.Choreographer.doCallbacks(Choreographer.java:593)
at android.view.Choreographer.doFrame(Choreographer.java:562)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:766)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5336)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:681)
at dalvik.system.NativeStart.main(Native Method)
參考:
http://stackoverflow.com/questions/7575921/illegalstateexception-can-not-perform-this-action-after-onsaveinstancestate-h
http://stackoverflow.com/questions/14278763/call-onsaveinstancestate-without-calling-super-onsaveinstancestateoutstate
解決:
在重載onSaveInstanceState()中，不調(diào)用super()方法，由于調(diào)用super方法，在API level大于11時(shí)，可能致使崩潰。
@Override
protected void onSaveInstanceState(Bundle outState) {
//No call for super(). Bug on API Level > 11.
// super.onSaveInstanceState(outState);
}
onSaveInstanceState()方法的作用: onSaveInstanceState的調(diào)用遵守原則，即當(dāng)系統(tǒng)“未經(jīng)用戶許可”時(shí)燒毀activity，則onSaveInstanceState會(huì)被系統(tǒng)調(diào)用。
這是系統(tǒng)的責(zé)任，由于它必須要提供1個(gè)機(jī)會(huì)讓用戶保存數(shù)據(jù)。
super.onSaveInstanceState(outState)：
活動(dòng)本身會(huì)在bundle中存入1些值，例如fragments的狀態(tài)，如果沒有調(diào)用super方法，這些值不會(huì)被保存，但也不會(huì)使程序崩潰。
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