解决onSaveInstanceState的Bug
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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)
- 解决:在重载onSaveInstanceState()中,不调用super()方法,因为调用super方法,在API level大于11时,可能导致崩溃。
- onSaveInstanceState()方法的作用:
- @Override
- protected void onSaveInstanceState(Bundle outState) {
- //No call for super(). Bug on API Level > 11.
- // super.onSaveInstanceState(outState);
- }
onSaveInstanceState的调用遵循原则,即当系统“未经用户许可”时销毁activity,则onSaveInstanceState会被系统调用。这是系统的责任,因为它必须要提供一个机会让用户保存数据。super.onSaveInstanceState(outState):活动本身会在bundle中存入一些值,例如fragments的状态,如果没有调用super方法,这些值不会被保存,但也不会使程序崩溃。
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